JP2008105454A - Cable connection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple cable connection structure capable of connecting or disconnecting connection ends of two cables by the inserting and drawing motion in the axial direction. <P>SOLUTION: A first cable 40 and a second cable 50 are connected to/disconnected from each other via a cylindrical support 2S. When a connection end of the first cable 40 is inserted from a lower side of the support 2S, an engagement projection 41P provided on the connection end is received by reception grooves Bd, Bd of a stay 4B (the second cable 50), and the engagement projection 41 is temporarily held at its terminating end while the engagement projection is elastically locked by leaf springs 70, 70. Insertion grooves Sd, Sd and the reception grooves Bd, Bd are curved opposite to each other in the circumferential direction. When the connection end of the second cable 50 is inserted from an upper side of the support 2S, the engagement projection 41 is received by the reception grooves Bd, Bd, and disengaged from the engagement state with the support 2S and engaged with the second cable 50. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cable connection structure. Specifically, the present invention relates to a separable cable coupling structure in which a first cable and a second cable are axially coupled so as to be movable in the axial direction and can be separated.

2. Description of the Related Art Conventionally, some seats for automobile seats employ an active headrest that supports a passenger's head by instantaneously moving the headrest forward when a rear collision of the vehicle occurs. Here, as a moving mechanism for moving the headrest forward, one that is operated by a pulling operation of a cable member is known.
This cable member has a double structure in which a linear inner member is inserted into a tubular outer member, and an end portion on the operation side to be pulled is routed inside the seat back. As a result, the cable member is pulled by receiving a backrest load applied to the occupant's back against the seat back when a rear collision of the vehicle occurs. That is, the cable member is routed through the inside of the headrest and the inside of the seat back. Therefore, when the headrest is configured to be detachable with respect to the seat back, the cable members are divided and routed in advance and the ends are connected to each other when the headrest is mounted. Therefore, it is necessary to devise such that the routing work can be easily performed.
Here, in Patent Document 1 below, by performing a mounting operation of inserting a stay, which is a headrest column, into a support installed on the upper part of the seat back, the electric wirings arranged inside them are connected to each other. Techniques that can be used are disclosed. In this disclosure, the connecting end of the electrical wiring is held in a standby state inside the support. Then, the stay is inserted into the cylindrical shape of the support so that the ends of both wirings are axially connected to each other, and then the holding state of the electric wiring by the support is released. Thereby, since the movement of the axially connected wiring in the axial direction is allowed, the stay can be further inserted into the cylindrical shape of the support.
JP 2003-299549 A

  However, in the prior art disclosed in the above-mentioned Patent Document 1, the connecting structure for axially connecting both wires so as to be movable in the axial direction is complicated. Further, in order to separate the above-described shaft-connected wirings from each other by the operation of removing the headrest from the seat back, the connecting structure becomes more complicated.

  The present invention has been devised as a solution to the above-described problem, and the problem to be solved by the present invention is to connect the two cable ends by moving them in the axial direction. Or simply separating the structure that can be separated.

In order to solve the above problems, the cable connection structure of the present invention takes the following means.
A first invention is a separable cable coupling structure in which a first cable and a second cable are axially coupled so as to be movable in the axial direction and can be separated. The connection and separation between the first cable and the second cable are performed via a cylindrical connection member fixed to the fixing member in the axial direction. The connecting end portion of the first cable is formed as an end shape that can be inserted into the cylindrical shape of the connecting member, and the engaging protrusion has a shape protruding outward in the radial direction at the connecting end portion. Is provided. The connection end of the second cable is formed as a tubular end shape that can be inserted into the tubular shape of the connection member, and the connection end of the first cable is formed on the tubular peripheral wall of the connection end. A receiving groove capable of receiving the provided engaging projection in the axial direction is formed extending in the axial direction. The connection end of the first cable is inserted into the cylindrical connection member from one side in the axial direction, and the engagement protrusion provided on the connection end extends in the axial direction formed on the peripheral wall of the connection member. As inserted into the insertion groove having a shape, it is inserted and moved in the axial direction along the shape of the insertion groove. The insertion groove formed in the peripheral wall of the connecting member is formed in a shape bent in one of the circumferential directions toward the axial end portion through which the engaging protrusion is inserted. The receiving groove formed on the peripheral wall of the connecting end of the second cable is bent toward the other end in the circumferential direction opposite to the shape of the insertion groove toward the axial end where the engaging protrusion is received. It is formed into a shape. The connecting end portion of the first cable is inserted into the cylindrical shape of the connecting member from one side in the axial direction, and the engaging projection moves to the end portion of the insertion groove formed in the connecting member and bent in one circumferential direction. Thereby, the relative movement in the axial direction with respect to the connecting member of the first cable is held in a restricted state. The connection end of the second cable is inserted into the cylindrical shape of the connection member holding the connection end of the first cable from the other side in the axial direction, thereby forming a peripheral wall of the connection end of the second cable. The engagement protrusion held at the terminal end of the insertion groove of the connecting member is received in the axial direction in the receiving groove having a shape extending in the axial direction. By further insertion of the connecting member of the second cable into the cylindrical shape, the insertion protrusion is guided in the shape of the end portion bent in the circumferential direction of the receiving groove formed in the second cable. The engagement protrusion is allowed to move relative to the connecting member in the axial direction while being moved from the terminal end to the other end in the circumferential direction while being pushed and moved to the other end in the circumferential direction. The relative movement in the direction is restricted, and the first cable and the second cable are axially connected so as to be movable in the axial direction. By moving the connecting end portion of the second cable in the direction of pulling out from the connecting member, the engaging protrusion held at the terminal end portion of the receiving groove formed in the second cable is formed in the insertion groove formed in the connecting member. It is moved from the terminal end of the receiving groove to the terminal end of the insertion groove while being guided by the shape of the terminal end bent in the circumferential direction, and the engagement protrusion with respect to the second cable. The relative movement in the axial direction is allowed, and the shaft connection state between the first cable and the second cable is released. The connecting member is provided with elastic locking means capable of elastically holding and locking the engaging protrusion at the position of the end portion of the insertion groove formed in the connecting member. The elastic locking means is configured to be able to move the engaging protrusion along the insertion groove when an acting force that overcomes the elastic locking force for locking the engaging protrusion is exerted from the engaging protrusion. ing.
According to the first invention, the first cable is held in a state of being inserted into the cylindrical shape by inserting the connecting end portion into the cylindrical shape of the connecting member from one side in the axial direction. Specifically, the first cable is bent in one circumferential direction of the insertion groove by inserting an engagement protrusion provided at the connection end portion in the axial direction along the insertion groove formed on the peripheral wall of the connection member. Reaching the end of the shape. At this time, the engaging projection reaches the end portion of the insertion groove while pushing away (elastically deforming) the elastic locking means provided protruding from the inside of the insertion groove. Thereby, the engagement protrusion is held in a state of being locked at the position of the end portion of the insertion groove by the elastic locking force of the elastic locking means. In this locked state, the engaging protrusion is held in a state in which relative movement in the axial direction with respect to the connecting member is restricted.
In this restricted state, when the connecting end portion of the second cable is inserted into the cylindrical shape of the connecting member from the other side in the axial direction, the engaging protrusion is axially inserted into the receiving groove formed in the second cable. Will be accepted. Then, the engaging protrusion is pushed to the other in the circumferential direction while being guided along the shape of the receiving groove as the second cable is inserted through the connecting end. As a result, the engaging protrusion is positioned at a shape portion that extends in the axial direction of the insertion groove by detaching from the terminal end portion of the insertion groove against the elastic locking force of the elastic locking means, and relative to the connecting member in the axial direction. The movement is allowed. However, on the other hand, the engaging protrusion is positioned at the end portion of the shape bent in the other circumferential direction of the receiving groove. Thereby, the relative movement in the axial direction of the engaging protrusion with respect to the second cable is restricted, and the first cable and the second cable are connected in the axial direction. Then, by moving the second cable in the direction in which the second cable is pulled out of the connecting member from this shaft connected state, the engaging protrusion is now pushed and moved in one of the circumferential directions along the shape of the insertion groove. . As a result, the engaging protrusion is positioned at a shape portion that extends from the terminal end of the receiving groove and extends in the axial direction of the receiving groove, and is allowed to move relative to the second cable in the axial direction. That is, the shaft connection state between the first cable and the second cable is released.

Next, in a second aspect based on the first aspect described above, the shape of the insertion groove formed in the connecting member that is bent in one circumferential direction is such that the engaging protrusion is inserted from one side in the axial direction of the connecting member. It is formed facing the insertion direction.
According to the second aspect of the present invention, the shape of the insertion groove that is bent in one of the circumferential directions is in the insertion direction, and is a groove shape that is gently bent from the axial direction. Can be done smoothly.

Next, according to a third invention, in the first or second invention described above, a reinforcing portion is formed on the peripheral wall of the connecting member so as to partially thicken the edge side portion of the insertion groove formed in the peripheral wall. Has been.
According to the third aspect of the present invention, the rigidity against bending and twisting of the connecting member is enhanced by the reinforcing part formed along the edge part of the insertion groove extending in the axial direction, so that the connecting member is hardly deformed.

Next, according to a fourth aspect, in the third aspect, the reinforcing portion formed along the edge side portion of the insertion groove has a closed cross-sectional shape perpendicular to the axial direction of the connecting member. In this way, the insertion groove is formed so as to cover from the outer peripheral side.
According to the fourth aspect of the invention, the cross-sectional shape of the connecting member is formed into a closed cross-sectional shape by the covering shape of the reinforcing portion that covers the insertion groove from the outer peripheral side. Thereby, the section modulus of a connection member improves and it becomes difficult to deform | transform.

Next, according to a fifth aspect of the present invention, in the fourth aspect described above, an opening portion in which a peripheral wall is partially opened is set in a reinforcing portion that covers the insertion groove from the outer peripheral side.
According to the fifth aspect of the present invention, since the opening is partially set in the peripheral wall of the connecting member, the die cutting direction of the connecting member having a complicated shape having the reinforcing portion is set to the opening direction of the opening. It becomes possible to do.

Next, in a sixth aspect based on any one of the first to fifth aspects described above, the first cable is routed inside the seat back of the vehicle seat. The second cable is routed inside a headrest that is detachably attached to the upper portion of the seat back. The headrest is configured as an active headrest that can move a support portion that receives the head of an occupant seated on a seat relative to a seatback when a rear-end collision occurs. The operation of the support portion is performed by the cable and the second cable.
According to the sixth aspect of the invention, the stay support can be freely inserted and removed by the separable connecting structure of the first cable and the second cable. As a result, the active headrest can be freely attached to and detached from the seat back.

The present invention can obtain the following effects by taking the above-described means.
First, according to the first invention, the first cable is provided with an engagement protrusion, and the connecting member for temporarily holding the first protrusion and the second cable connected thereto are formed with alternately bent grooves. It is possible to simply configure a structure capable of connecting and separating each other by the movement of inserting and removing the connecting end portions of the two cables in the axial direction. And by providing the elastic locking means on the connecting member, the first cable can be stably and temporarily held on the connecting member.
Furthermore, according to the second invention, by forming the shape that bends in one of the circumferential directions of the insertion groove so as to bend gently from the axial direction, it is possible to smoothly move the engagement protrusions, The operation of connecting and disconnecting both cables can be smoothly performed.
Furthermore, according to the third aspect, since the reinforcing portion that increases the rigidity of the connecting member in which the insertion groove is formed and makes it difficult to deform is formed, the engagement protrusion can be inserted and removed more smoothly. At the same time, the use durability of the connecting member can be improved.
Furthermore, according to the fourth invention, the effect of the third invention can be further enhanced by forming the connecting member so that the cross-sectional shape of the connecting member becomes a closed cross-sectional shape by the covering shape of the reinforcing portion.
Furthermore, according to the fifth invention, when molding a complicated-shaped connecting member having a reinforcing portion, the die cutting direction can be set in the opening direction of the opening set in the peripheral wall. The mold can be easily removed, and the formability of the connecting member can be improved.
Furthermore, according to the sixth aspect, the active headrest operated by the cable routed through the inside of the seat back can be freely attached to and detached from the seat back.

  Embodiments of the best mode for carrying out the present invention will be described below with reference to the drawings.

First, the cable connection structure of Example 1 will be described with reference to FIGS.
As shown in FIG. 1, the cable connection structure of the present embodiment is a connection structure that connects the first cable 40 and the second cable 50 arranged inside the seat 1 disposed as a vehicle seat. is there. The seat 1 includes a seat back 2 that serves as a backrest portion for an occupant, a seat cushion 3 that serves as a seating portion, and a headrest 4 that serves as a receiving portion for the head. In each of the drawings including FIG. 1, the internal structure of the seat back 2 and the headrest 4 is shown for easy understanding of the configuration of the seat 1.
Here, the headrest 4 has two rod-like stays 4B, 4B erected at the lower part thereof in the insertion holes Sa, Sa of the cylindrical supports 2S, 2S installed at the upper part of the seat back 2. Each is inserted into the upper part of the seat back 2 by being inserted. The supports 2S and 2S are integrally fixed to an upper frame Fu that forms an upper arm of a back frame 2F that forms a skeleton of the seat back 2. Here, the back frame 2F corresponds to the fixing member of the present invention.
The headrest 4 is normally held in the installed posture position so that the head of the occupant seated on the seat 1 can be received at the rear side position. However, the headrest 4 is configured such that, when a rear collision of the vehicle occurs, the front-side support portion 4A that receives the head can be instantaneously moved forward. That is, when the rear collision occurs, the support portion 4A can be moved closer to the back of the back of the head with respect to the occupant in a sitting posture with the body floating forward from the seat back 2 or the headrest 4. ing. Thereby, when a rear collision occurs, it is possible to prevent the head from being tilted too much backward by that momentum, and the load on the neck can be reduced.

The forward movement operation of the support portion 4 </ b> A at the time of the vehicle collision is performed by the headrest moving mechanism 10 incorporated in the headrest 4.
Here, in FIG. 4, the appearance of the headrest moving mechanism 10 is shown in a side view. As shown in the figure, the headrest moving mechanism 10 keeps the support portion 4A in the initial state posture state in a state where the forward movement is restricted before the vehicle collision occurs.
When the vehicle collision occurs, the headrest moving mechanism 10 cancels the forward movement restriction state of the support portion 4 </ b> A and moves the support portion 4 </ b> A forward and upward by the bias of the tension spring 16. Thereby, as shown in FIG. 7, the headrest moving mechanism 10 moves the support portion 4 </ b> A to the collision corresponding position where the support portion 4 </ b> A is approached just behind the back of the head. Here, in the state where the headrest moving mechanism 10 has moved the support portion 4A to the position corresponding to the collision, the support portion 4A is moved rearward even if a load in which the head of the occupant tilts backward due to the occurrence of the vehicle collision is received. It is not pushed back. As a result, the head of the occupant can be stably received by the support portion 4A held at the collision corresponding position. Details of the headrest moving mechanism 10 will be described later.

By the way, returning to FIG. 4, the operation of releasing the restriction state of the support portion 4 </ b> A described above is performed by the cable operation of the second cable 50 connected to the headrest moving mechanism 10. The second cable 50 is routed inside the headrest 4 and is axially connected to the first cable 40 routed inside the seat back 2, as shown in FIG. The first cable 40 is connected to the lower end of the second cable 50 on the upper end side, and the lower end side is connected to a mechanism that pulls the first cable 40 in the event of a vehicle collision.
Here, in FIG. 2, the connection structure between the first cable 40 and the second cable 50 is enlarged and shown in an exploded perspective view. As shown in the figure, the first cable 40 and the second cable 50 are connected to each other at the connecting end portion of the headrest 4 where the left stay 4B shown in the figure is inserted into the support 2S. It has come to be. The connection structure of the first cable 40 and the second cable 50 can be connected to or separated from each other by movement of the left stay 4B with respect to the support 2S. Thereby, the operation | work which attaches or removes the headrest 4 with respect to the seat back 2 can be performed freely.

Here, in FIG. 3, the mechanism for pulling the lower end of the first cable 40 is shown enlarged in a perspective view. As shown in the figure, inside the seat back 2, a bending rod-like pushing member 20 extending in the width direction is disposed in the middle part thereof.
The pushing member 20 is formed in a shape in which a middle portion in the width direction is bent downward, and is formed as a receiving arm 21 that receives the backrest load of the occupant. The pushing member 20 is supported at its right end in the plane of the paper by the side frame Fs on the right side in the plane of the back frame 2F that forms the skeleton of the seat back 2 so as to be pivotable. Specifically, a torsion spring 20S is hung between the end of the pushing member 20 on the right side in the drawing and the side frame Fs. The torsion spring 20S is provided in a state of being pre-twisted, and urges the pushing member 20 to rotate in a direction in which the receiving portion 21 is moved forward. As a result, the pushing member 20 is held in a state where the rotation by the urging is restricted at a position where it comes into contact with a cushion pad (not shown) provided on the backrest surface of the seat back 2. Further, the pushing member 20 is rigidly coupled at its left end in the drawing to the connecting arm 31A of the damper 30 disposed on the left side frame Fs.
Here, the damper 30 has a rotary structure including a rotating shaft 31 and a cylindrical case 32. Specifically, the rotation shaft 31 is connected to the case 32 so as to be pivotable in a shape inserted into the cylindrical shape of the case 32. A viscous fluid such as silicone oil is filled in a sealed state between the cylindrical case 32 and the rotating shaft 31. The viscous fluid transmits the rotational force of the rotating shaft 31 to the case 32 by its viscous resistance depending on the relative rotation speed of the rotating shaft 31 with respect to the case 32, or the rotating shaft 31 is transferred to the case 32. It has the characteristic that it can be swayed internally to cut off transmission.
The rotation shaft 31 is supported by the side frame Fs on the left side in the drawing so that the shaft can rotate. Specifically, the rotation shaft 31 is pivotally supported at a position coaxial with the position where the right end of the pushing member 20 in the drawing is pivotally supported. The rotating shaft 31 is integrally connected to the connecting arm 31A formed to extend outward in the radial direction by rigidly coupling the left end portion of the pushing member 20 described above. ing. As a result, the pushing member 20 is supported by the both side frames Fs and Fs so as to be pivotable by the shaft support structures at both ends arranged on the same axis.

The pushing member 20 configured as described above receives a backrest load from the occupant at the receiving arm 21. The pushing member 20 receives the movement of the receiving arm 21 being pushed rearward by the backrest load of the occupant, and pivots the turning shaft 31 of the damper 30 integrally connected thereto. .
At this time, when the rotational speed of the rotational shaft 31 is a relatively slow speed that is received by the backrest load during normal seating use, the rotational force of the rotational shaft 31 is transferred to the case 32. Is not transmitted. However, when the rotational speed of the rotational shaft 31 is a high speed received by a relatively large backrest load caused by a vehicle collision, the rotational force of the rotational shaft 31 is transmitted to the case 32, and the case 32 Rotate integrally with this.
Here, the lower end portion of the inner member 41 of the first cable 40 is connected to the operation arm 32A formed to extend outward in the radial direction of the case 32, and is integrated with the case 32. Yes. Therefore, the case 32 pulls the inner member 41 downward by rotating the shaft integrally with the rotation shaft 31. Accordingly, as described above with reference to FIG. 4, the second cable 50 is operated by the cable, and the restriction state of the support portion 4 </ b> A by the headrest moving mechanism 10 is released. Here, referring back to FIG. 1, the operating arm 32A of the case 32 described above comes into contact with a stopper 61 of a bent plate-shaped mounting bracket 60 fixed to a side frame Fs, which will be described later, thereby pressing the torsion spring 20S. The rotational movement in the urging direction integral with the moving member 20 is restricted.

Next, the headrest moving mechanism 10 will be described. Although the configuration of the headrest moving mechanism 10 is shown in FIGS. 4 to 10, since the state of FIG. 7 well represents the configuration of each unit, the configuration of each unit will be described below using FIG. 7. .
As shown in FIG. 7, the headrest moving mechanism 10 includes a base 11, a pair of connecting links 12 and 12, a pair of support members 13 and 13, a pair of hooks 14 and 14, and an operation member 15. The tension spring 16 and a pair of avoidance guide lever members 17 and 17 are provided.
Specifically, the base 11 is made of synthetic resin, and is erected from a plate-shaped rear surface portion 11B, a plate-shaped bottom surface portion 11D extending forward from the lower end edge thereof, and left and right side edges thereof. The plate-like side surface portions 11S and 11S and the upper surface portion 11U formed in a shape connecting the upper edges of the both side surface portions 11S and 11S are integrally provided. Here, FIG. 10 shows a configuration diagram of the headrest moving mechanism 10 as seen from the Y-line direction of FIG. As shown in the figure, a plurality of plate-like ribs 11R, 11R, 11R, and 11R stand up from the rear surface portion 11B and the bottom surface portion 11D in parallel between the side surface portions 11S and 11S of the base 11. The base 11 is reinforced.
Returning to FIG. 7, the upper ends of the stays 4 </ b> B and 4 </ b> B are inserted into the bottom surface portion 11 </ b> D of the base 11 and are integrally fixed. These stays 4B and 4B are formed in a tubular shape, and are attached in such a manner that the opening on the upper end side is exposed on the upper surface side of the bottom surface portion 11D. Here, each stay 4B, 4B is formed in a bent shape in which the upper part from the middle of the stay 4B is inclined forward in the shape of a "ku".
In addition, through holes 11H and 11H having penetrating shapes penetrating in a wavy shape are formed in the side surface portions 11S and 11S described above. The long holes 11H and 11H are formed between first lower end portions H0 and H0 and upper end portions H3 and H3, and first stopper grooves H1 and H1 each having a concave shape stepped in the rear side (right side in the drawing). Second stopper grooves H2 and H2 are formed.

Next, the pair of connecting links 12 and 12 are made of synthetic resin, and are arranged side by side in the width direction so as to link the portion near the upper end of the base 11 and the portion on the rear surface side of the support portion 4A. It is installed. Specifically, the connecting links 12 and 12 are connected at their rear ends so as to be pivotable by connecting shafts 12 </ b> A extending in the width direction and penetrating the both side surfaces 11 </ b> S and 11 </ b> S of the base 11. More specifically, as shown in FIG. 10, the rear ends of the connecting links 12, 12 are the left and right side surface portions 11 </ b> S, 11 </ b> S formed on the base 11 and the ribs 11 </ b> R, 11 </ b> R formed inside them. They are arranged at positions sandwiched between them and supported by the connecting shaft 12A. Returning to FIG. 7, the connecting links 12 and 12 are connected so that the front ends of the connecting links 12 and 12 can be pivoted by a connecting shaft 12 </ b> B extending in the width direction connected to the rear surface side portion of the support portion 4 </ b> A. . Here, the connecting shafts 12A and 12B are arranged in parallel directions.
As shown in the figure, the connecting links 12 and 12 are brought into contact with the upper surface portion 11U of the base 11 by rotating clockwise from the state of FIG. 4 around the connecting shaft 12A. Thereby, the rotation to the same direction of the connection links 12 and 12 is controlled.

Next, the pair of support members 13 and 13 are formed side by side in the width direction of the support portion 4A, and are formed integrally with the support portion 4A so as to extend from the rear surface side to the rear side thereof. Here, the entire support portion 4A is formed into a curved plate shape by integral molding of synthetic resin, and the above-described pair of support members 13 and 13 and the above-described connecting shaft 12B are connected to the rear surface side thereof. Are connected to each other in the width direction so as to protrude rearward.
The rear ends of these support members 13 and 13 are connected to each other by a connecting shaft 13A extending in the width direction. Specifically, as shown in FIG. 10, the rear ends of the support members 13 and 13 are between the outer ribs 11R and 11R formed on the base 11 and the ribs 11R and 11R formed on the inner sides thereof. It is arrange | positioned in the position pinched | interposed in, and is connected with the connection shaft 13A. Here, referring back to FIG. 7, the connecting shaft 13A is arranged in a direction parallel to each of the connecting shafts 12A and 12B described above, and the long holes 11H formed in the side surface portions 11S and 11S of the base 11 are formed. , 11H. As a result, the support members 13 and 13 can be moved relative to the base 11 in the front-rear direction and the vertical direction within a range in which the connecting shaft 13A can move inside the long holes 11H and 11H. .
In addition, each rib 11R, 11R, 11R, 11R (refer FIG. 10) formed in the base 11 is formed in the shape which does not interfere with the connection shaft 13A which moves the inside of the long holes 11H, 11H.

  Next, as shown in FIG. 5, the pair of hooks 14 and 14 are made of metal and are formed in a cam shape as a whole. Specifically, each of the hooks 14 and 14 is formed with an upper jaw portion 14B and 14B and a lower jaw portion 14C and 14C projecting in a claw shape at the peripheral edge portion. These hooks 14 and 14 are arranged in the width direction in a portion near the lower end of the base 11, and are connected to a connecting shaft 14 </ b> A extending in the width direction provided through both side surface portions 11 </ b> S and 11 </ b> S of the base 11. They are connected together. Thus, the hooks 14 and 14 are supported so as to be pivotable with respect to the base 11. Specifically, as shown in FIG. 10, the hooks 14 and 14 are sandwiched between the left and right side surface portions 11S and 11S formed on the base 11 and the ribs 11R and 11R formed on the inside thereof. It arrange | positions at each position and is integrally connected with 14 A of connecting shafts. As a result, the hooks 14 and 14 are pivoted together as a unit. Here, the connecting shaft 14A is arranged in a direction parallel to the connecting shafts 12A and 12B and the connecting shaft 13A.

Here, FIG. 5 is represented as a cross-sectional view as seen from the direction of FIG. 10 cut along the line V-V. In FIG. 5, in order to explain the operation structure of the headrest moving mechanism 10 in an easy-to-understand manner, In the drawing, components that do not actually appear are drawn. As shown in the figure, torsion springs 14S and 14S are hung between the hooks 14 and 14 and the base 11, respectively. Each of the torsion springs 14S and 14S is provided in the form of being wound around the connecting shaft 14A. One end of the torsion springs 14S and 14S is hooked on the hooks 14 and 14, and the other end is hooked on the base 11. These torsion springs 14S and 14S are provided in a pre-twisted state, and respectively urge the hooks 14 and 14 to rotate counterclockwise with respect to the base 11 from the state of FIG.
Further, the hooks 14 and 14 are formed with recessed locking grooves 14D and 14D at the peripheral portions thereof. A pair of operating arms 15C and 15C of an operating member 15 described later are engaged with the locking grooves 14D and 14D. Accordingly, the hooks 14 and 14 are in a state in which counterclockwise rotation due to the biasing is restricted.
Here, the operating arms 15C and 15C are integrally connected to a connecting shaft 15B provided on the left end side in the drawing, and are supported so as to be pivotable with respect to the base 11. A torsion spring 15S is hung between the one operating arm 15C and the base 11. The torsion spring 15S is provided in the form of being wound around the connecting shaft 15B. One end of the torsion spring 15S is hooked on the operating arm 15C and the other end is hooked on the base 11. The torsion spring 15S is provided in a state of being pre-twisted, and urges both the operating arms 15C and 15C to rotate clockwise with respect to the base 11 from the state of FIG. As a result, the operating arms 15C and 15C are normally held in the engaged postures that have entered the locking grooves 14D and 14D formed in the hooks 14 and 14, respectively.

The operating arms 15C and 15C are released from the engaged state with the hooks 14 and 14 by being rotated counterclockwise against the urging force. Thereby, the hooks 14 and 14 are released from the rotation restriction state by the operation arms 15C and 15C, and rotate integrally counterclockwise. And after that, each hook 14 and 14 latches by contacting with other structural members, such as connecting shaft 15B.
Here, the hooks 14 and 14 are exposed to the upper jaw portions 14B and 14B in the holes of the long holes 11H and 11H as shown in FIG. 4 in a state where the rotation of the hooks 14 and 14 is restricted by the operation arms 15C and 15C. The lower end portions H0 and H0 of the long holes 11H and 11H are held in a posture state in which they are sandwiched between the upper jaw portions 14B and 14B and the lower jaw portions 14C and 14C. Then, the hooks 14 and 14 are disengaged from the operating arms 15C and 15C (see FIG. 5) and are urged and rotated counterclockwise, as shown in FIG. 14B is moved out of the long holes 11H and 11H, and the lower jaw portions 14C and 14C are pushed up from the lower side to be exposed in the long holes 11H and 11H.

With reference to FIG. 6, the hooks 14 and 14 having the above-described configuration perform an operation of dropping the connecting shaft 13A connected to the support members 13 and 13 to the lower end portions H0 and H0 of the long holes 11H and 11H. The connecting shaft 13A can be engaged and held at the lower end portions H0 and H0.
Specifically, as described above, the hooks 14 and 14 are in a posture state in which the lower jaw portions 14C and 14C are exposed in the holes of the long holes 11H and 11H. Accordingly, in this state, by dropping the connecting shaft 13A into the lower end portions H0 and H0, the lower jaw portions 14C and 14C of the hooks 14 and 14 are pushed out of the long holes 11H and 11H in such a manner as to be pressed by this. . The hooks 14 and 14 are rotated clockwise by the movement of the lower jaw portions 14C and 14C. As shown in FIG. 4, the connecting shaft 13A moves to the lower ends H0 and H0 of the long holes 11H and 11H. While being dropped, each upper jaw part 14B, 14B is turned on the upper side. Then, as shown in FIG. 5, by the clockwise rotation of the hooks 14, 14, the operating arms 15 </ b> C, 15 </ b> C enter the locking grooves 14 </ b> D, 14 </ b> D of the hooks 14, 14 by urging. Is locked in that position. As a result, the connecting shaft 13A is sandwiched between the upper jaw portions 14B, 14B and the lower jaw portions 14C, 14C of the hooks 14, 14, and the connecting shaft 13A has the long holes 11H, 11H, as shown in FIG. 11H is held at the position (initial position) of the lower end portions H0 and H0.
The connecting shaft 13A is held at the positions of the lower end portions H0 and H0 described above, so that the support portion 4A is held at the initial position.

Next, as shown in FIG. 4, the operation member 15 is made of synthetic resin, and the connecting arm 15 </ b> A disposed on the outer surface side of the left side surface portion 11 </ b> S of the base 11 illustrated in FIG. The operation arms 15C and 15C described above are integrally connected by a connecting shaft 15B. Returning to FIG. 4, the connecting arm 15 </ b> A is connected to the upper end of the inner member 51 of the second cable 50, and the connecting shaft 15 </ b> B is moved by pushing and pulling the inner member 51 in the axial direction (vertical direction). It is designed to rotate around the center.
The connecting arm 15A is always held in the posture state shown in FIG. 4 by the bias of the torsion spring 15S described above with reference to FIG. Then, the connecting arm 15A is rotated counterclockwise by performing an operation of pushing the inner member 51 of the second cable 50 upward from this state. Accordingly, returning to FIG. 5, the operation arms 15 </ b> C and 15 </ b> C also rotate together, and the rotation restricting state of the hooks 14 and 14 is released by this rotation, and the connecting shaft 13 </ b> A of the hooks 14 and 14 is released. The hold state is released.

Next, as shown in FIG. 4, the tension spring 16 includes a connecting shaft 12 </ b> A that connects the rear ends of the connecting links 12, 12 and the base 11, and a connecting shaft that connects the rear ends of the support members 13, 13. 13A. The tension spring 16 urges the connecting shaft 13A toward the connecting shaft 12A, and the connecting shaft 13A (see FIG. 4) held in the lower ends H0 and H0 of the long holes 11H and 11H has an upper end. It is encouraging towards H3 and H3.
Therefore, when the holding state by the hooks 14 and 14 is released by the operation of the operation member 15, the connecting shaft 13A has an upper end along the shape of the long holes 11H and 11H as shown in FIGS. It moves toward part H3, H3. With this movement, the support portion 4A moves relatively forward and upward from the initial position shown in FIG. 4 while the connecting links 12 and 12 are rotated.

Here, at the time of the occurrence of the above-described vehicle collision, in the process in which the support portion 4A moves forward and upward from the initial position, for example, before reaching the collision corresponding position as indicated by the phantom line in FIG. A passenger | crew's head may hit | support 4 A of support parts, and 4 A of support parts may be pushed and moved back. However, in this case, the connecting shaft 13A that moves in the long holes 11H and 11H is gradually waved to the rear side (the right side in the drawing) of the long holes 11H and 11H by the movement that is pushed to the rear side. The first stopper grooves H1 and H1 and the second stopper grooves H2 and H2 having a recessed shape are inserted. Here, in FIG. 6, the state in which the connecting shaft 13A enters the second stopper grooves H2 and H2 is indicated by a solid line.
Accordingly, the movement of the connecting shaft 13A can be restricted so as not to be pushed back to the lower end portions H0, H0 of the long holes 11H, 11H, and the support portion 4A can be prevented from being pushed back to the rear side. Accordingly, the head of the occupant can be stably received by the support portion 4A that is held at a fixed position.

Next, returning to FIG. 4, the pair of avoidance guide lever members 17 and 17 are made of synthetic resin, and the rear ends thereof are pivotally supported by the portion near the upper end of the base 11 in the width direction. Are arranged side by side. As shown in FIG. 10, these avoidance guide lever members 17, 17 have ribs 11 R, 11 R formed on the outside of the base 11 and ribs 11 R, 11 R formed on the inside thereof. Are respectively connected to the connecting shafts 17A and 17A extending in the width direction and penetrating therebetween. Thereby, the avoidance guide lever members 17 and 17 are supported so as to be pivotable with respect to the base 11.
Here, returning to FIG. 4, torsion springs 17 </ b> S and 17 </ b> S are respectively hung between the avoidance guide lever members 17 and 17 and the base 11. These torsion springs 17S and 17S are provided in the form of being wound around the connecting shafts 17A and 17A, respectively. One end of the torsion springs 17S and 17S is hooked on the avoidance guide lever members 17 and 17, and the other end is hooked on the base 11. I wear it. Thereby, the torsion springs 17S and 17S hold the avoidance guide lever members 17 and 17 in the posture state shown in FIG. 4 in the free state. That is, the front end portions of the avoidance guide lever members 17 and 17 are held in a posture state where they are exposed in the long holes 11H and 11H. Here, the avoidance guide lever members 17 and 17 are formed with spoon-shaped receiving portions 17B and 17B at the front end portions thereof. The avoidance guide lever members 17 and 17 are normally held in a posture in which the spoon-shaped receiving portions 17B and 17B are exposed in the holes 11H and 11H, respectively.

These avoidance guide lever members 17 and 17 move upward in the long holes 11H and 11H when the support portion 4A moves in the traveling direction from the initial position shown in FIG. 4 to the collision corresponding position shown in FIG. It is designed to be pushed away from the bottom by being pushed up from below by the connecting shaft 13A. Specifically, as shown in FIG. 6, the avoidance guide lever members 17 and 17 are once pushed clockwise by the connecting shaft 13A that moves upward. As shown in FIG. 7, the avoidance guide lever members 17 and 17 are separated from the contact with the connecting shaft 13A when the connecting shaft 13A reaches the upper end portions H3 and H3 of the long holes 11H and 11H. Due to the force, the posture is returned to the state before being pushed.
However, as shown in FIG. 8, the avoidance guide lever members 17 and 17 are connecting shafts that move downward in the long holes 11H and 11H when the support portion 4A is returned from the collision corresponding position to the initial position. 13A is received by spoon-shaped receiving portions 17B and 17B formed at the front end portion thereof. Then, by further moving the support portion 4A toward the initial position in this receiving state, the avoidance guide lever members 17 and 17 are pushed and moved by the connecting shaft 13A to guide the counterclockwise counterclockwise paper. Rotate around. As shown in FIG. 9, the avoidance guide lever members 17 and 17 move and guide the connecting shaft 13A to the vicinity of the lower ends H0 and H0 of the long holes 11H and 11H, and then come into contact with the connecting shaft 13A. Come off. That is, in the avoidance guide lever members 17 and 17, the connecting shaft 13A enters the first stopper grooves H1 and H1 and the second stopper grooves H2 and H2 of the long holes 11H and 11H during the operation of returning the support portion 4A to the initial position. This is guided so as not to move, and assists so that the support portion 4A can be smoothly returned to the initial position.

Next, returning to FIG. 2, the first cable 40 and the second cable 50 will be described.
That is, first, the first cable 40 has a double structure in which a linear inner member 41 having flexibility is inserted into the tubular outer member 42. The first cable 40 is configured as a connecting end portion in which the illustrated upper end portion is connected to the lower end portion of the second cable 50. Specifically, an engagement protrusion 41 </ b> P that protrudes outward in the radial direction in a T shape is formed on the upper end portion of the inner member 41. In addition, elongated holes 42S and 42S are formed in the peripheral wall on the upper end side of the outer member 42 so that both ends of the engagement protrusion 41P protruding in the T-shape can be penetrated in the radial direction. These long holes 42S and 42S are formed in the peripheral wall of the outer member 42 in a shape that is elongated in the axial direction, and the inner member 41 is relatively moved in the axial direction within the range of the long holes 42S and 42S. Is allowed. Further, a head portion 42H is formed at the upper end portion of the outer member 42 so as to close the tubular opening end portion.

The first cable 40 having the above configuration is held in a state where it is suspended by inserting the connecting end portion on the upper end side into the insertion port Sa of the left support 2S shown in the drawing from the lower side. It has become so.
Specifically, insertion grooves Sd and Sd extending upward (in the axial direction) from the lower end portion are formed in two axially symmetrical positions on the inner peripheral surface of the peripheral wall of the left support 2S. In each of the drawings including FIG. 2, only the insertion groove Sd on one side represented on the front side in the drawing is illustrated in order to easily show the configuration of the support 2 </ b> S, and the other side represented on the back side. The insertion groove Sd is not shown.
Each of the insertion grooves Sd and Sd is formed in a shape that is axially symmetric with respect to each other. And each insertion groove | channel Sd and Sd becomes the structure coat | covered with respect to the exterior by the reinforcement site | part Sc and Sc formed so that those outer peripheral surfaces might be coat | covered. Here, each reinforcement site | part Sc, Sc is formed in the shape which protrudes in the radial direction partially from the surrounding wall of the support 2S, and the edge side site | part of each insertion groove | channel Sd, Sd is partially thickened. And the outer peripheral surface is covered. And by these reinforced parts Sc and Sc, the peripheral wall of the support 2S having the insertion grooves Sd and Sd is formed in a closed cross-sectional shape in which the cross-sectional shape perpendicular to the axial direction is endless.

The support 2S configured as described above can receive both ends of the T-shaped engagement protrusions 41P formed at the upper end of the inner member 41 in the axial direction in the insertion grooves Sd and Sd formed on the inner peripheral surface side thereof. It is like that. Therefore, by inserting the connecting end portion of the first cable 40 into the insertion port Sa of the support 2S from the lower side, the engagement protrusion 41P is engaged with the insertion grooves Sd and Sd in the axial direction. Can be inserted and moved along.
Here, each insertion groove Sd, Sd is formed in a shape that is gently curved toward one side in the circumferential direction toward its axial end portion. Specifically, the illustrated insertion groove Sd on one side is formed in a shape curved toward the circumferential direction, which is the left direction in the drawing, toward the end portion in the axial direction. The insertion groove Sd on the other side (not shown) is formed in a curved shape in the circumferential direction that is the right direction in the drawing and is axially symmetric with the above. The shape of these insertion grooves Sd, Sd that bends in one circumferential direction is formed so as to be gently curved from the axial direction, and is formed so as to face upward in the drawing sheet, which is the insertion direction of the engagement protrusion 41P.
Here, the support 2S is formed by integral molding of nylon resin (PA). In forming the support 2S, the direction of punching at the time of molding can be set as the opening direction of the openings So and So by the openings So and So set at the upper ends of the reinforcing portions Sc and Sc. Therefore, the support 2S having a complicated shape having the reinforcing portions Sc and Sc curved in the circumferential direction can be formed relatively easily by setting the die cutting direction.

Therefore, as shown in FIG. 11, the connecting end portion of the first cable 40 is inserted into the insertion port Sa of the support 2S from the lower side and inserted and moved in the axial direction, thereby being provided at the connecting end portion. The engaging protrusion 41P can reach the end portion curved in the circumferential direction of each insertion groove Sd, Sd. Here, since each insertion groove Sd, Sd is formed in a shape gently curved in the circumferential direction from the axial direction as described above, by inserting the connecting end portion of the first cable 40 in the axial direction, The engagement protrusion 41P can be naturally rotated in the circumferential direction following the curved shape of each insertion groove Sd, Sd.
Here, referring back to FIG. 2, leaf springs 70, 70 capable of elastically locking the engagement protrusions 41 </ b> P at the positions of the end portions of the respective insertion grooves Sd, Sd are provided on the outer peripheral surface of the support 2 </ b> S. It is arranged. Here, the leaf springs 70 and 70 correspond to the elastic locking means of the present invention. These leaf springs 70, 70 are formed in a shape in which the lower end portions are bent like a fishhook, and the upper end portions thereof are integrally hooked to hook portions Se, Se formed to protrude from the peripheral wall. Thereby, each leaf | plate spring 70,70 has the lower end part (locking part 71,71) bent in the shape of the fishhook in the opening | mouth of each opening part So, So formed in the upper end part of the reinforcement part Sc, Sc. It is held in the encased state. Specifically, the hook-shaped locking portions 71 and 71 are in contact with the guide portions Sp and Sp that are formed to protrude from the peripheral wall, and the deformation movement in the left direction in the paper surface is restricted. It is in a state.

The plate springs 70 and 70 having the above-described structure are elastically deformed in such a manner that the engaging protrusion 41P is pushed away by the movement of the engaging protrusion 41P to the end portion of the insertion grooves Sd and Sd. Then, as shown in FIG. 11, the leaf springs 70 and 70 have the engagement protrusion 41P inserted into the end portions of the insertion grooves Sd and Sd, so that the engagement protrusion 41P is moved to the end portion along with its restoring deformation. It will be in the state latched elastically in the position of. Here, FIG. 17 shows a state in which the leaf springs 70 and 70 are pressed and elastically deformed by the engaging protrusions 41P that are inserted and moved through the insertion grooves Sd and Sd. As shown in the figure, the leaf springs 70 and 70 project into the insertion grooves Sd and Sd by the engagement protrusion 41P being inserted and moved toward the end portions of the insertion grooves Sd and Sd. The hook-like locking parts 71, 71 interfere with the engaging protrusion 41P and are pressed against it. As a result, the hook-shaped locking portions 71 and 71 are pushed upward in the paper surface (in the axial direction) in a manner guided by the shape of the guide portions Sp and Sp that restrict the deformation movement in the leftward direction in the paper surface. And elastically deforms in a wavy shape. Then, the engagement protrusion 41P is further inserted and moved from this state to the end of the insertion grooves Sd and Sd, whereby the leaf springs 70 and 70 are restored and deformed as shown in FIG. 41P is elastically locked to the position of the terminal portion.
Accordingly, the engagement protrusion 41P is held in an elastically locked state at the end portions of the insertion grooves Sd and Sd, whereby the engagement protrusion 41P is axially directed with respect to the support 2S (the direction of gravity and the opposite direction). The relative movement of the first cable 40 is restricted, and the connecting end portion of the first cable 40 is inserted into the insertion port Sa of the support 2S and held in a suspended state.
As shown in FIGS. 12 and 14, the leaf springs 70, 70 described above are locked by moving the engagement protrusion 41 </ b> P in a direction to release from the end portion by a force that overcomes the elastic locking force. The engagement state with respect to the engagement protrusion 41P can be released with the deformation movement of the portions 71 and 71 in the right direction in the drawing.

  Here, referring back to FIG. 2, the peripheral wall on the upper end side of the outer member 42 is formed of synthetic resin, and the diameter thereof is partially thick so that a portion in the axial direction thereof matches the inner diameter of the insertion port Sa. Is formed. A plurality of projections and depressions extending in the axial direction are formed in a serration over the entire circumference on the outer peripheral surface portion of the thick portion. As a result, the outer member 42 can be fitted into the insertion port Sa without any backlash, and the axial movement of the outer member 42 relative to the insertion port Sa can be performed smoothly.

Incidentally, as shown in FIG. 3, the lower end of the first cable 40 is routed along the left side frame Fs of the back frame 2F in the drawing. The lower end portion of the outer member 42 of the first cable 40 is fitted into the outer mounting portion 61 of the bent plate-shaped mounting bracket 60 fixed to the side frame Fs, so that it is integrated with the outer mounting portion 61 in the axial direction. And being held. And the lower end part of the inner member 41 is connected with the operation arm 32A of the damper 30 mentioned above, and is made into the state integrated with this.
The first cable 40 having the above configuration is pulled by the lower end of the inner member 41 being pulled downward by the operating arm 32 </ b> A so that the lower end of the inner member 41 is pulled out from the lower end of the outer member 42.
As shown in FIG. 1, the first cable 40 has a configuration in which the inner member 41 and the outer member 42 are both flexible, such as an air conditioner disposed inside the seat back 2. Are arranged in a curved posture so as to avoid various structures (not shown).

Next, returning to FIG. 2, the second cable 50 is routed inside the headrest 4, and the double inner member 51 is inserted into the tubular stay 4 </ b> B serving as the outer member 52. It has a structure. That is, the outer member 52 is constituted by a tubular stay 4B on the left side of the illustrated headrest 4. Therefore, in the following description, the structure of the outer member 52 will be described using the left stay 4B.
The second cable 50 is configured as a connecting end portion in which the illustrated lower end portion is connected to the upper end portion of the first cable 40. Specifically, the second cable 50 has a configuration in which a rod-shaped inner member 51 is suspended inside a tubular stay 4B. As shown in FIG. 4, the inner member 51 is held in a state of being suspended by the upper end of the inner member 51 being connected to the connecting arm 15 </ b> A of the headrest moving mechanism 10.
Returning to FIG. 2, receiving grooves Bd and Bd extending in the axial direction from the lower end to the upper side are formed through the peripheral wall of the stay 4 </ b> B at two axially symmetrical positions. Here, in FIG. 2, the receiving grooves Bd and Bd are respectively represented by a solid line and a broken line on the left front side and the right back side of the drawing. As shown in FIGS. 12 and 14, these receiving grooves Bd, Bd are engaged with the first cable 40 held in the opening by inserting the stay 4B into the insertion port Sa of the support 2S. Both ends of the protrusion 41P are moved against the elastic locking force of the leaf springs 70, 70 so as to be received in the axial direction. Specifically, the stay 4B receives both ends of the engaging protrusion 41P in the receiving grooves Bd and Bd while receiving the head portion 42H of the outer member 42 of the first cable 40 in the tubular shape. Each of the receiving grooves Bd and Bd is inserted and moved along the axial direction in a state in which the engagement protrusion 41P is engaged with the stay 4B by inserting the stay 4B into the insertion port Sa of the support 2S. It is like that.

Here, referring back to FIG. 2, the receiving groove Bd on one side illustrated on the left front side of the paper surface is formed in a shape in which the axial end portion is curved toward the right direction (circumferential direction) in the paper surface. ing. The receiving groove Bd on the other side formed on the right back side is formed in a shape curved in the left direction (circumferential direction) in the drawing in a shape that is axially symmetric with the receiving groove Bd on the one side. . In other words, each of the receiving grooves Bd and Bd is formed in a shape that is curved in the opposite direction (alternating direction) in the circumferential direction with respect to each of the insertion grooves Sd and Sd described above.
Therefore, as shown in FIG. 12, by inserting the stay 4B having the above configuration into the insertion port Sa of the support 2S, for example, one end of the engagement protrusion 41P shown on the right front side of the paper surface is formed on the stay 4B. It is pushed back in the same direction from the end portion of the insertion groove Sd while being guided by the shape of the end portion bent in the right direction of the receiving groove Bd on the right front side of the paper. Note that the other end of the engaging protrusion 41P at an axially symmetric position (not shown) is pushed back from the end portion of the insertion groove Sd by a movement that is axially symmetric with respect to the one end. Here, in FIG. 14, the state of FIG. 12 is represented by a front view. As a result, as shown in FIG. 13, the engaging protrusion 41P moves to the end portions of the receiving grooves Bd and Bd, and moves to a shape portion that extends away from the end portions of the insertion grooves Sd and Sd and extends in the axial direction thereof. To do. Therefore, this movement allows the engagement protrusion 41P to be allowed to move relative to the support 2S in the axial direction (gravity direction and its opposite direction) and relative to the stay 4B in the axial direction. Is in a regulated state. Specifically, the engagement protrusion 41P is held in an integral state in the axial direction with respect to the stay 4B due to the intersecting shape of the receiving grooves Bd, Bd and the insertion grooves Sd, Sd. It can be moved only in the axial direction. Therefore, the upper end portion of the inner member 41 of the first cable 40 and the lower end portion of the outer member 52 (stay 4B) of the second cable 50 are axially connected by the engagement between the engagement protrusion 41P and the stay 4B. It becomes.

In the above-described shaft connection state, the stay 4B is in a state in which it can be further inserted and moved. Therefore, as shown in FIG. 15, in the above-described shaft coupling state, the stay 4B can be inserted up to the insertion position locked to the support 2S. FIG. 15 is represented as a cross-sectional view of FIG. 13 viewed from the direction cut along the line XX.
Here, on the peripheral wall of the left stay 4 </ b> B shown in the drawing, a locking groove Bs having a notch shape is formed. Further, the support 2S on the left side is provided with a locking claw St urged toward the mouth of the insertion port Sa. The locking claw St is normally held in a posture protruding into the insertion port Sa, and can be pushed out of the insertion port Sa by performing an operation of pushing the knob Sb from the side. It has become. Therefore, by inserting the stay 4B into the insertion port Sa in the state where the knob Sb is pushed, and inserting the stay 4B as it is, this is automatically performed at a position where the locking claw St matches the locking groove Bs. Therefore, the movement of the stay 4B in the insertion direction can be locked. The locking grooves Bs are formed at a plurality of positions in the axial direction on the peripheral wall of the stay 4B. Therefore, the installation height position of the headrest 4 can be freely adjusted by changing the insertion amount of the stay 4B while performing the pushing operation of the knob Sb.

Similarly, the headrest 4 can be removed from the seat back 2 by pulling out the stays 4B and 4B from the supports 2S and 2S while performing the pushing operation of the knob Sb. The stay 4B and 4B are pulled out to release the shaft connection state between the upper end portion of the inner member 41 of the first cable 40 and the lower end portion of the stay 4B.
Specifically, as shown in FIG. 17, when the left stay 4 </ b> B shown in the drawing is moved in a direction to be pulled out from the insertion port Sa of the support 2 </ b> S, for example, the engagement protrusion 41 </ b> P shown on the front side of the paper surface. One end of the receiving groove Bd is guided in the shape of the end portion bent in the left direction of the insertion groove Sd formed on the front side of the paper, opposite to the movement at the time of insertion described above. It is pushed back in the same direction from the end. By this movement, the engaging protrusion 41P moves toward the end portions of the insertion grooves Sd, Sd, and moves to a shape portion that extends away from the end portions of the receiving grooves Bd, Bd and extends in the axial direction thereof. As a result of this movement, the engagement protrusion 41P is elastically locked to the positions of the end portions of the insertion grooves Sd and Sd by the leaf springs 70 and 70 again. As a result, the engagement protrusion 41P is in a state in which relative movement in the axial direction with respect to the stay 4B is permitted, while relative movement in the axial direction is restricted with respect to the support 2S. Thereby, the shaft connection state of the stay 4B and the first cable 40 is released, and only the stay 4B can be pulled out from the support 2S.

Here, returning to FIG. 15, in the state where the upper end portion of the inner member 41 of the first cable 40 and the lower end portion of the stay 4 </ b> B are axially connected, the lower end of the inner member 51 of the second cable 50 is The cable 40 is located at a position slightly away from the head 42H of the outer member 42 of the cable 40 upward. Thereby, the inner member 51 of the second cable 50 is prevented from being pushed up from below by the head portion 42H of the outer member 42 of the first cable 40 during the insertion operation of the stay 4B.
As shown in FIG. 16, the second cable 50 connected to the shaft is pushed up to the head 42 </ b> H of the outer member 42 when the inner member 41 of the first cable 40 is pulled downward. Thus, the inner member 51 is pushed upward. That is, the stay 4 </ b> B, which is the outer member 52 of the second cable 50, is axially coupled to the inner member 41 of the first cable 40 and is in an integral state. Therefore, when the inner member 41 of the first cable 40 is pulled downward in this shaft connection state, the outer member 42 is relatively pushed upward. Accordingly, the inner member 51 of the second cable 50 is pushed up from below by the head portion 42H of the outer member 42. Then, as can be seen with reference to FIG. 4, when the inner member 51 of the second cable 50 is pushed up, the connecting arm 15A is turned counterclockwise, so that the support portion 4A is moved to the initial position. The hold state is released.
That is, the first cable 40 has a pulling cable structure in which the inner member 41 is pulled downward, and the second cable 50 has an extrusion type cable structure in which the inner member 51 is pushed upward. It has become. In the shaft coupling structure of the first cable 40 and the second cable 50, the inner member 41 and the outer member 52 (stay 4B) are in a shaft coupling state by performing the insertion operation of the stay 4B, and the outer member 42 and the inner member 51 have a reverse connection structure in which the shaft is connected (a state where cable operation is possible by extrusion).

Next, the usage method of a present Example is demonstrated.
That is, referring to FIG. 1, the headrest 4 is configured to be detachable from the seat back 2, and the stays 4 </ b> B and 4 </ b> B under the headrest 4 are respectively inserted into the insertion ports Sa and Sa of the supports 2 </ b> S and 2 </ b> S. By being inserted, it is mounted on the upper part of the seat back 2. Then, the first cable 40 and the second cable 50 are connected to each other by the operation of inserting the left side (right side in the drawing) stay 4B.
The seat 1 assembled as described above always holds the support portion 4A of the headrest 4 in the posture state at the initial position before the vehicle collision occurs. And if the rear surface collision of a vehicle generate | occur | produces and the backrest load which a passenger | crew's back part presses against the seat back 2 is applied, the pushing member 20 will be pushed back. As a result, the holding state of the support portion 4A is released, and the support portion 4A moves from the initial position shown in FIG. 4 to the collision corresponding position shown in FIG. And 4 A of support parts receive from the back side the passenger | crew's head which inclines backward with the momentum of a vehicle collision in this collision corresponding position.

  Thus, according to the cable connection structure of the present embodiment, the engagement protrusion 41P is provided on the inner member 41 of the first cable 40, and the outer support of the support 2S for temporarily holding it and the second cable 50 connected thereto. By forming the insertion grooves Sd, Sd and the receiving grooves Bd, Bd that are alternately bent in the member 50 (stay 4B), the connection ends of the two cables are connected to each other by movement in the axial direction. A structure that can be separated or separated can be simply configured. Further, by providing the support 2S with the leaf springs 70, which are elastic locking means, the first cable 40 can be stably and temporarily held on the support 2S. Further, since the shape of the insertion grooves Sd and Sd that bend in the circumferential direction is formed so as to be gently bent from the axial direction, the engagement protrusion 41P can be smoothly inserted and removed, and the first cable 40 can be smoothly moved. And the second cable 50 can be smoothly connected and disconnected. Furthermore, by forming the reinforcement portions Sc and Sc that increase the rigidity of the support 2S in which the insertion grooves Sd and Sd are formed and make it difficult to be deformed, the engagement protrusion 41P can be inserted and removed more smoothly. The durability of use of the support 2S can be improved. Furthermore, the rigidity of the support 2S can be further increased by forming the support 2S so that the cross-sectional shape of the support 2S becomes a closed cross-sectional shape by the covering shape of the reinforcing portions Sc and Sc. Furthermore, when forming the support 2S having a complicated shape having the reinforcing portions Sc and Sc, the die cutting direction can be set in the opening direction of the openings So and So set in the peripheral wall. It becomes easy to remove, and the moldability of the support 2S can be improved. Furthermore, the headrest 4 (active headrest) operated by the first cable 40 and the second cable 50 routed through the seatback 2 can be freely attached to and detached from the seatback 2. .

Next, the cable connection structure of Example 2 will be described with reference to FIG.
In the present embodiment, description of portions that have substantially the same configuration and operation as the cable connection structure of the first embodiment will be omitted, and different portions will be described in detail.
In the cable connection structure of the present embodiment, engagement protrusions 42P and 42P projecting outward in the radial direction are formed at two axially symmetrical positions on the upper end portion of the outer member 42 of the first cable 40, respectively. The engagement protrusions 42P and 42P are formed in the insertion grooves Sd and Sd formed in the support 2S and the stay 4B (the outer member 52 of the second cable 50), similarly to the engagement protrusion 41P shown in the first embodiment. The receiving grooves Bd and Bd are engaged. In the present embodiment, the inner member 41 of the first cable 40 is also formed of a relatively rigid rod-like member, like the inner member 51 of the second cable 50. The first cable 40 has an extrusion-type cable structure that pushes up the inner member 51 of the second cable 50 from below by performing an operation in which the rod-like inner member 41 is pushed upward on the lower end side. It has become. Therefore, the first cable 40 has a shape in which the opening end portion on the upper end side of the outer member 42 is opened, and the lower end of the inner member 51 of the second cable 50 is pushed up to the upper end portion of the inner member 41. A pedestal-shaped head 41 </ b> H serving as a seat is formed. The second cable 50 has the same extrusion configuration as that shown in the first embodiment.
Thus, even if the engagement protrusions 42P and 42P are provided on the outer member 42 of the first cable 40, the operation of inserting and removing the stays 4B and 4B of the headrest 4 with respect to the supports 2S and 2S of the seat back 2 The first cable 40 and the second cable 50 can be easily axially connected or separated.

Then, the cable connection structure of Example 3 is demonstrated using FIGS. 19-20.
In the present embodiment, description of portions that have substantially the same configuration and operation as the cable connection structure of the first embodiment will be omitted, and different portions will be described in detail.
As shown in FIG. 19, the cable connection structure of the present embodiment is formed in a shape in which the end portions of the respective insertion grooves Sd, Sd are bent vertically from the axial direction to the circumferential direction. Furthermore, leaf springs 80 and 80 are provided on the outer peripheral surface of the support 2S. The leaf springs 80 and 80 can elastically lock the engaging protrusion 41P at the end portions of the insertion grooves Sd and Sd. Here, the leaf springs 80 and 80 correspond to the elastic locking means of the present invention.
These plate springs 80 and 80 are formed in a flat plate shape, and their lower end portions are embedded in the reinforcing portions Sc and Sc and fixed integrally therewith. Thereby, each leaf | plate spring 80,80 is hold | maintained as the state which made those flat shape protrude in the inside of each insertion groove | channel Sd, Sd. Specifically, the leaf springs 80 and 80 are arranged in a slanted manner with respect to the shape of the insertion grooves Sd and Sd extending in the axial direction. As a result, the leaf springs 80, 80 end in the upper end portions so that the circumferential widths of the insertion grooves Sd, Sd are gradually narrowed upward in the axial direction through which the engaging protrusions 41P are inserted. It is in a posture state toward the part. In addition, the upper end part of each leaf | plate spring 80 and 80 is formed in the rounded shape which curved in the paper surface upper direction.
Therefore, as shown in FIG. 20, the engagement protrusion 41 </ b> P pushes the leaf springs 80, 80 away by inserting the connecting end of the first cable 40 into the support 2 </ b> S having the above configuration from below in the axial direction. While reaching the end portion while being naturally rotated and moved in a circumferential direction while being elastically moved and guided following the inclined shape. As the engagement protrusion 41P reaches the end portion, the leaf springs 80 and 80 are restored and deformed, and the engagement protrusion 41P can be elastically locked to the position of the end portion.
As shown in the figure, the engagement protrusion 41P has a shape of a terminal portion bent to the right in the circumferential direction of the receiving groove Bd by inserting the stay 4B into the insertion port Sa of the support 2S. In the guided form, the leaf springs 80 and 80 are pushed back in the same direction from the end portions of the insertion grooves Sd and Sd against the elastic locking force of the leaf springs 80 and 80.
Thus, the support 2S of the engagement protrusion 41P moved to the end portion is formed by forming the insertion grooves Sd and Sd formed in the support 2S into a shape bent vertically from the axial direction to the circumferential direction. The relative movement in the axial direction (the direction of gravity and the opposite direction) with respect to can be better regulated.
Further, leaf springs 80, 80 as elastic locking means are provided so as to be inclined with respect to the axial direction in which the insertion grooves Sd, Sd extend, and the engagement protrusions 41P are bent in the circumferential direction of the insertion grooves Sd, Sd. Since the engagement protrusion 41P is inserted and moved in the axial direction, it can be naturally moved to the end portions of the insertion grooves Sd and Sd.

As mentioned above, although the embodiment of the present invention has been described with three examples, the present invention can be implemented in various forms in addition to the above examples.
For example, the headrest moving mechanism can be configured by a four-bar linkage mechanism as disclosed in documents such as Japanese Patent Application Laid-Open No. 2005-104259. Further, the headrest moving mechanism may be configured to directly rotate in the traveling direction by the movement of both cables.
Further, the outer member of the second cable may not be constituted by a stay, and may be constituted by a separately arranged tubular member. In addition, the first cable and the second cable do not necessarily have a double structure composed of an inner member and an outer member, and may have a single-wire cable structure.
In addition, the cable connection structure of the present invention is not limited to an aspect in which the headrest and the seat back are incorporated in the insertion connection portion as in the above embodiment, and the two cables are axially connected so as to be movable in the axial direction. In addition, the present invention can be applied to various structures that can be separated.
In addition, the shape of the insertion groove formed in the support (connecting member) to be bent in the circumferential direction is bent downward further than the direction perpendicular to the insertion direction of the engaging protrusion (upward in the axial direction), and lower in the axial direction. It may be formed in a shape that can be folded back. Thereby, compared with the structure shown in the said Example, it can be made difficult to drop an engagement protrusion from the termination | terminus part of an insertion groove. However, on the other hand, it is difficult to move the engagement protrusion in the circumferential direction with respect to the movement of inserting and removing the first cable and the stay from the support. In addition, the reinforcing portion that thickens and reinforces the edge side portion of the insertion groove does not necessarily have to be formed so as to cover the support so that the cross-sectional shape of the support becomes a closed cross-sectional shape. However, when the support cross-sectional shape is an open-ended cross-sectional shape, the rigidity against bending and twisting of the support is reduced, and the support is easily deformed. It is necessary to pay attention to the fact that it is impossible to perform the operation or the durability of the support is lowered.
In addition, the insertion groove formed in the support, the receiving groove formed in the stay, and the engagement protrusion provided in the first cable do not necessarily have to be set in a plurality of axially symmetrical positions, but only in one place in the circumferential direction. It may be set to.
Further, as shown in FIGS. 21 and 22, elastic locking means for elastically holding and locking the engaging protrusion at the position of the end portion of the insertion groove protrudes into the insertion grooves Sd and Sd. The formed protrusions 90 (FIG. 21) and the spherical engaging portions 102, 102 attached to the distal ends of the compression springs 101, 101 that expand and contract along the guides 103, 103 are located inside the insertion grooves Sd, Sd. It can also be constituted by plungers 100, 100 having a structure that is elastically supported so as to be able to move in and out.

3 is a perspective view illustrating a schematic configuration of a sheet according to Embodiment 1. FIG. It is the disassembled perspective view which expanded and represented the connection structure of a 1st cable and a 2nd cable. It is the perspective view which expanded and represented the mechanism which carries out the pulling operation of the lower end of a 1st cable. It is a side view showing the initial state of the headrest moving mechanism. It is a block diagram showing the structure which hold | maintains a headrest moving mechanism in an initial state. It is a side view showing the state in the middle of the movement to the advancing direction of a headrest moving mechanism. It is a side view showing the state where the headrest moving mechanism has finished moving in the traveling direction. FIG. 8 is a configuration diagram illustrating an intermediate state of an operation for returning the headrest moving mechanism to the initial state from the state of FIG. 7. FIG. 9 is a configuration diagram illustrating a state in which the headrest moving mechanism is returned to the initial state while being guided from the state of FIG. 8. It is the block diagram which looked at the headrest moving mechanism from the Y line direction of FIG. It is a partial expansion perspective view showing the state before inserting the stay of a headrest in the support installed in the seat back. FIG. 12 is a partially enlarged perspective view showing a state in which the stay is further inserted from the state of FIG. 11. FIG. 13 is a partially enlarged perspective view showing a state in which the stay is further inserted from the state of FIG. 12 and the first cable and the second cable are axially connected. It is the block diagram which expanded and represented the state of FIG. It is a block diagram showing the internal structure of the state of FIG. It is a block diagram showing the state by which the 1st cable was pulled operation from the state of FIG. It is a block diagram showing the state in the middle of a stay being pulled out from a support. 6 is an exploded perspective view showing a cable connection structure of Example 2. FIG. FIG. 6 is a configuration diagram illustrating a cable connection structure according to a third embodiment. It is a block diagram showing a mode that an engagement protrusion moves with the insertion / extraction movement of a stay. It is a block diagram showing the other modified Example of the elastic latching means. It is a block diagram showing the other modified Example of the elastic latching means.

Explanation of symbols

1 seat 2 seat back 2F back frame (fixing member)
Fu Upper frame Fs Side frame 2S Support Sa Insertion slot Sb Knob St Locking claw Sd Insertion groove Sc Reinforcement part So Opening part Sp Guide part Se Hanging part 3 Seat cushion 4 Headrest 4A Support part 4B Stay Bd Receiving groove Bs Reception groove Bs DESCRIPTION OF SYMBOLS 10 Headrest moving mechanism 11 Base 11B Rear surface part 11D Bottom surface part 11S Side surface part 11U Upper surface part 11R Rib 11H Long hole H0 Lower end part H1 First stopper groove H2 Second stopper groove H3 Upper end part 12 Connection link 12A Connection shaft 12B Connection shaft 13 Support member 13A Connection shaft 14 Hook 14A Connection shaft 14B Upper jaw portion 14C Lower jaw portion 14D Locking groove 14S Torsion spring 15 Operation member 15A Connection arm 15B Connection shaft 15C Operation arm 15S Torsion spring 16 Tension spring 17 Avoidance guide lever member 17A Connection 17B receiving portion 17S torsion spring 20 pushing member 20S torsion spring 21 receiving arm 30 damper 31 rotating shaft 31A connecting arm 32 case 32A operation arm 40 first cable 41 inner member 41P engaging protrusion 41H head 42 outer member 42S long Hole 42H Head portion 42P Engagement protrusion 50 Second cable 51 Inner member 52 Outer member 60 Mounting bracket 61 Outer mounting portion 62 Stopper 70 Leaf spring (elastic locking means)
71 locking part 80 leaf spring (elastic locking means)
90 Projection 100 Plunger 101 Compression spring 102 Locking portion 103 Guide

Claims (6)

A separable cable coupling structure in which the first cable and the second cable are axially coupled so as to be movable in the axial direction and can be separated.
The connection and separation between the first cable and the second cable are performed via a cylindrical connection member fixed to the fixing member in the axial direction.
The connecting end portion of the first cable is formed as an end shape that can be inserted into the tubular shape of the connecting member, and the engaging end has a radially protruding shape at the connecting end portion. A protrusion is provided,
The connecting end portion of the second cable is formed as a tubular end portion that can be inserted into the cylindrical shape of the connecting member, and the connecting end portion of the first cable is formed on the tubular peripheral wall of the connecting end portion. A receiving groove that can receive in the axial direction the engaging protrusion provided in the portion extends in the axial direction,
The first cable has a connecting end portion inserted into a cylindrical connecting member from one side in the axial direction, and an engaging projection provided on the connecting end portion is formed on the peripheral wall of the connecting member. As inserted into the insertion groove having a shape extending to the insertion groove, the insertion groove can be moved in the axial direction along the shape of the insertion groove.
The insertion groove formed in the peripheral wall of the connecting member is formed in a shape bent in one of the circumferential directions toward the axial end portion through which the engaging protrusion is inserted,
The receiving groove formed on the peripheral wall of the connecting end of the second cable has the other circumferential direction opposite to the shape of the insertion groove toward the axial end where the engaging protrusion is received. It is formed in a bent shape,
The terminal end of the shape where the connecting end portion of the first cable is inserted into the cylindrical shape of the connecting member from one side in the axial direction, and the engaging projection is bent to one side in the circumferential direction of the insertion groove formed in the connecting member. The first cable is held in a state where the relative movement in the axial direction with respect to the connecting member is restricted, and the shaft is inserted into the cylindrical shape of the connecting member holding the connecting end of the first cable. When the connecting end portion of the second cable is inserted from the other side in the direction, the end of the insertion groove of the connecting member is inserted into the receiving groove formed in the peripheral wall of the connecting end portion of the second cable and extending in the axial direction. The engagement protrusion held in the portion is received in the axial direction, and the engagement protrusion is formed in the receiving groove formed in the second cable by further insertion of the connecting member of the second cable into the cylindrical shape. Guide to end shape bent to the other side in the circumferential direction In this way, it is moved from the terminal end of the insertion groove to the terminal end of the receiving groove while being pushed to the other in the circumferential direction, and the relative movement in the axial direction of the engaging protrusion with respect to the connecting member is allowed and the The relative movement in the axial direction of the engaging protrusion with respect to the second cable is restricted, and the first cable and the second cable are axially connected so as to be movable in the axial direction.
By moving the connecting end of the second cable in the direction of pulling out from the connecting member, an engaging protrusion held at the terminal end of the receiving groove formed in the second cable is formed on the connecting member. The engagement protrusion is moved from the terminal end of the receiving groove to the terminal end of the insertion groove while being guided by the shape of the terminal end bent in the circumferential direction of the insertion groove. The relative movement in the axial direction with respect to the second cable is allowed and the axial connection state between the first cable and the second cable is released,
The connecting member is provided with elastic locking means capable of elastically holding and locking the engaging protrusion at the position of the end portion of the insertion groove formed in the connecting member. The stopping means is configured to be able to move the engaging protrusion along the insertion groove when an acting force overcoming the elastic locking force for locking the engaging protrusion is exerted from the engaging protrusion. The cable connection structure characterized by having. The cable connection structure according to claim 1,
The shape of the insertion groove formed in the connecting member that is bent in one circumferential direction is formed so as to face the insertion direction in which the engaging protrusion is inserted from one side in the axial direction of the connecting member. Cable connection structure. The cable connection structure according to claim 1 or 2,
A cable connection structure characterized in that a reinforcing part is formed on the peripheral wall of the connecting member so as to partially thicken an edge side part of an insertion groove formed in the peripheral wall. The cable connection structure according to claim 3,
The reinforcing portion formed along the edge side portion of the insertion groove is formed by covering the insertion groove from the outer peripheral side so that a cross-sectional shape perpendicular to the axial direction of the connecting member is a closed cross-sectional shape. A cable connection structure characterized by that. The cable connection structure according to claim 4,
The cable connection structure according to claim 1, wherein an opening portion in which a peripheral wall is partially opened is set in a reinforcing portion that covers the insertion groove from the outer peripheral side. The cable connection structure according to any one of claims 1 to 5,
The first cable is routed inside a seat back of a vehicle seat, and the second cable is routed inside a headrest that is detachably attached to an upper portion of the seat back;
The headrest is configured as an active headrest that can move a support portion that receives the head of an occupant seated on the seat relative to the seat back when a vehicle rear-end collision occurs, and the headrest is connected to the shaft. The cable connection structure, wherein the support portion is operated by the first cable and the second cable.

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