JPH05301560A - Through-guide structure for seat belt - Google Patents

Abstract

PURPOSE:To improve fitting ability of a seat belt with the upper body of a seating passenger without increasing the size and the weight of a seat back frame. CONSTITUTION:A through-guide 12 to support a seat belt and specify the upper end of a shoulder belt is elevatably arranged to the side of the shoulder part of a seat back 14. Elevation of the through-guide 12 is regulated by means of a regulating means 42 having a lead screw 44 and a nut 46.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a through guide structure for a seat belt which is provided on a shoulder portion of a seat back and vertically regulates an upper supporting position of the shoulder belt of the seat belt.

[0002]

2. Description of the Related Art For example, in an automobile or the like, a seat belt for preventing a seated person from jumping out is generally used as a front seat (driver seat or assistant seat).
Of course, it is also installed on the rear seats.

The seat belt corresponding to the front seat is constructed so that it can be pulled out at the time of use by being pulled by a pulling means called a retractor incorporated in a center pillar or the like of the body of an automobile. The seat belt is extended, for example, via an upper support member called an intermediate plate provided on a center pillar or the like, and is loosely inserted with a tongue and connected to a floor anchor.

A buckle capable of inserting and locking the tongue of the seat belt is arranged on the opposite side of the seat, and the seat belt is used by inserting the tongue into the buckle and withdrawing the seat belt.

Such a seat belt has a so-called 3 shape, which is substantially ∠-shaped on the front, for a seated person on the seat.
It is configured to be point-supported. In the three-point support type seat belt, the intermediate plate (upper support member),
The inclined portion between the tongues is defined as a shoulder belt that holds the portion from the shoulder to the chest of the seated person, and the horizontal portion between the tongue and the floor anchor is defined as a waist belt that holds the waist portion of the seated person.

[0006]

By the way, in the known construction, the intermediate plate is usually mounted so that its position relative to the body of the vehicle is substantially constant. That is, since the upper support position of the shoulder belt by the intermediate plate is constant, the holding angle of the shoulder belt with respect to the front of the seat, that is, the upper body of the seated person is always constant regardless of the body shape of the seated person.

Here, it is desirable that the shoulder belt is located at the center of the shoulder of the seated upper body so as not to hit the neck. However, in the known configuration, since the holding angle by the shoulder belt is constant, depending on the body shape of the seated person, that is, the height of the sitting height, the seated belt may be displaced from the center of the seated person's shoulder. Will hold the upper body. Therefore, it is unavoidable that the fit of the shoulder belt on the seated person is deteriorated.

[0008] The deterioration of the fit of the shoulder belt to the upper body of the seated person is not preferable because not only the comfort of the seated person is deteriorated but also the original safety function of the seat belt may be deteriorated.

Further, in the front seat, normally,
The entire seat is supported by a seat slide device so as to be slidable in the front-rear direction, and the seat back is swingable in the front-rear direction by a reclining device. However, since the intermediate plate, buckle, etc. on which the seat belt is supported are provided on the body of the automobile, the upper body of the seated person moves relative to the seat belt when the seat slides or the seat back swings. To do.

In particular, when the seat back is tilted largely backward, the upper body of the seated person moves in a direction away from the shoulder belt, so that a gap is created between the upper body of the seated person and the shoulder belt. Therefore, also in this respect, it is unavoidable that the fit of the shoulder belt to the upper body of the seated person is deteriorated.

Here, for example, a through guide for loosely inserting and supporting a seat belt is provided at a shoulder portion of a seat back, and the through guide is set to an upper supporting position of the shoulder belt, so that the shoulder belt slides, There is known a configuration capable of following the swing of the seat back.

However, in such a configuration,
The through guide is usually provided immovably with respect to the seat back, and since the upper support position of the shoulder belt is substantially constant, the upper support position of the shoulder belt suitable for the body shape of the seated person,
In other words, the shoulder belt does not have a sufficient angle to hold the upper body, and it is impossible to secure a good fit according to the body shape.

Further, for example, there is known a structure in which a retractor is provided in the seat back so that the shoulder belt extends from the shoulder portion of the seat back. With such a configuration, the shoulder belt of the seat belt can be easily moved in accordance with the sliding of the seat and the swinging of the seat back, so that the shoulder belt can be sufficiently fitted to the upper body of the seated person. it can.

However, in such a structure, the retractor is built in the seat back, so that the seat back frame, the retractor mounting bracket, etc.
It is required to have high rigidity to withstand impacts in an emergency. Therefore, the seat back frame is inevitably increased in size, the structure is complicated, and the weight of the seat back is increased.

It is an object of the present invention to provide a through guide structure for a seat belt that improves the fit of the seat belt to the upper body of a seated person without increasing the size and weight of the seat back frame.

[0016]

In order to achieve this object, according to the present invention, a seat belt having a tongue is provided so as to be pulled out from a retractor in a body through an upper support member. And an upper support member,
I loosely insert the shoulder belt of the seat belt prescribed between the tongues,
The supporting through guide is the side of the seat back shoulder,
It is provided so as to be able to move up and down on any of the front faces, and the moving up and down of the through guide can be restricted by a restricting means.

[0017]

Embodiments of the present invention will now be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, in the through guide structure 10 for a seat belt according to the present invention, the through guide 12 is attached to the side surface of the shoulder portion of the seat back 14 so as to be vertically movable.

The through guide 12 is formed in, for example, a substantially ring shape into which a corresponding seat belt 16 provided on the body of an automobile or the like can be freely inserted and supported. As shown in FIG. 2, for example, the seat belt 16 of the seat 18 mounted as a front assistant seat is a retractor incorporated in the center pillar 20 of the body or the like called a retractor.
It is drawn in by 22 and can be pulled out at the time of use.

One end of the seat belt 16 is extended, for example, from an opening (not shown) of the center pillar 20 through an intermediate plate serving as an upper support member 24 of the seat belt, and the tongue 26 is loosely inserted to the floor anchor. It is connected to 28.

Such a seat belt 16 is shown in FIGS.
As shown in FIG. 5, for example, it is used by inserting and locking the tongue 26 in the buckle 30 provided on the opposite side of the seat 18 with the withdrawal of the seat belt 16 from the retractor (traction means) 22. As can be seen from FIG. 3, a portion between the intermediate plate (upper support member) 24 of the seat belt 16 and the tongue 26 serves as a shoulder belt 16a for holding a portion from the shoulder to the chest of the seated person, the tongue and the floor. A space between the anchors 28 is defined as a waist belt 16b that holds the waist of the seated person.

The seat belt 16, the retractor 22, the intermediate plate 24, and the floor anchor 28 are well known in the art, and the constructions themselves are not the subject of the present invention.

As can be seen from FIG. 4 in addition to FIG.
Seat back frame that forms the skeleton of the seat back 14
A support frame 34, which is bent and formed in a substantially U-shape, is formed on the right and left sides of 32, for example, the upper end on the right side in the figure.
34a is fixed in a state of being separated from the seat back frame. A guide rod 36 is installed and fixed between the base 34a of the support frame and the upper end of the seatback frame 32. That is, the guide rod 36 is erected on the shoulder portion of the seatback frame 32.

Then, for example, the slide block 38 having the extension rod 38a extending laterally is provided with the guide rod 36.
The slide guide is slidably attached to the slide block, and the through guide 12 is rotatably or rotatably attached to the tip of the extending rod of the slide block.

In such a structure, the through guide 12 moves up and down with respect to the seat back frame 32, that is, the seat back 14 as the slide block 38 slides along the axis of the guide rod 36.

Here, for example, as shown in FIG. 4, a guide groove 40 along the axis is formed in the guide rod 36, and an engaging piece (not shown) which can be engaged with and loosely fitted in the guide groove is slid. The slide block may be attached to the guide rod by providing the block 38 with the engaging piece loosely fitted in the guide groove.

According to this structure, the guide rod 36
The rotation of the slide block 38 with respect to can be reliably prevented,
The through guide 12 can be smoothly moved up and down without being shaken in the front-back direction of the seat back 14.

In the embodiment, the rotation of the slide block 38 with respect to the guide rod 36 is restricted by the combination of the guide groove 40 and the engaging piece, but the invention is not limited to this, and for example, a non-circular shape. The rotation of the slide block may be restricted by a combination of a guide rod and an insertion hole having a corresponding shape.

In the seat belt through guide structure 10 of the present invention, the restricting means 42 can restrict the up and down movement of the through guide 12 with respect to the seat back 14. As shown in FIGS. 1 and 4, the restricting means 42 includes, for example, a lead screw 44 that is interlocked with the drive of the motor M.
And a nut 46 screwed to the lead screw.

For example, a plate-shaped base bracket 48 is fixed to a shoulder portion on the left side of the seat back frame 32 in the drawing, and a motor M is fixed to the base bracket. As the motor M, for example, a DC geared motor can be used.

A similar base bracket 50 is fixed to the shoulder portion on the right side of the seat back frame 32 in the figure, and a gear box 52 having a rotatable lead screw 44 is fixed to this base bracket. .. The lead screw 44 is provided, for example, in a state of extending upward from the gear box 52, and is rotatable in a corresponding direction by rotation of gears combined in the gear box.

The gear box 52 is formed, for example, with a combination of a worm and a worm wheel (neither of which is shown), and the other end of the torque cable 54 whose one end is connected to the output shaft (not shown) of the motor M. The ends are operably connected to the lead screw 44 via a gear combination in the gearbox.

In this structure, the motor M is driven by
It is transmitted and converted into rotation of the lead screw 44 via the torque cable 54 and the gear box 52.

Although the gear box 52 is embodied here as a structure having a combination of a worm and a worm wheel, the motor M is driven by a lead screw.
It is not limited to this because it can be transmitted and converted into 44 rotations.

The gear box 52 may be omitted because it is sufficient if the lead screw 44 can rotate in the corresponding direction as the motor M is driven.

As can be seen in FIG. 4, the nut 46
For example, it is formed in a tubular shape that can be screwed into the lead screw 44, and is attached to the slide block 38 by pivotally attaching the upper end with a pivot pin 56.

In such a structure, the rotation of the lead screw 44 which is interlocked with the driving of the motor M causes the nut 46 to be advanced, retracted, that is, moved up and down in the axial direction of the lead screw. Then, as the nut 46 moves up and down, the slide block 38 slides along the axis of the guide rod 36,
The through guide 12 moves up and down with respect to the seat back 14 integrally with the guide rod.

The drive control of the motor M is performed, for example, by
It is performed by turning on and off an operation switch (not shown). As the operation switch, an automatic reset type seesaw type switch can be used, and the operation switch is a position where a seated person can operate, for example, a seat cushion of the seat 18.
It is installed on the side of 58.

For example, the through guide shown by the solid line in FIG.
It is assumed that the position 12 is the upper limit position, and at this position, when the operation switch is operated in the descending direction, the drive of the motor M becomes
It is transmitted to the lead screw 44 via the torque cable 54 and the gear box 52, and the lead screw rotates in the corresponding direction. Then, with the rotation of the lead screw 44, of the nut 46 for the lead screw, for example,
The screw guide retracts the through guide 12 together with the slide block 38, and when the operating force of the operation switch is released, the motor M is stopped to set the through guide to an arbitrary height.

The lower limit position of the through guide 12 is shown by a chain double-dashed line in FIG. That is, the through guide 12 can move up and down between the upper limit position shown by the solid line in FIG. 1 and the lower limit position shown by the two-dot chain line.

Here, as shown in FIG. 2, the through guide
The seat 12 is projected to the side of the seat back 14 through an elongated hole-shaped insertion hole 60 formed at a corresponding position on the side surface of the seat back shoulder. The peripheral edge of the insertion hole 60 is covered with, for example, a resin cover member 62 formed in a corresponding shape.

As described above, in the structure in which the periphery of the insertion hole 60 is covered with the cover member 62, it is possible to prevent the cut ends of the trim cover, the seat pad and the like from being exposed and the shape of the insertion hole from being deformed. Improves the overall appearance quality of the sheet 18.

1 and 4, reference numeral 64 indicates a pair of cylindrical stay brackets through which the stay 68 of the headrest 66 can be inserted and supported. Then, for example, the headrest 66 can be attached to the upper end of the seatback 14 by inserting the stay into the stay bracket 64 via a headrest holder (not shown) that holds the stay 68 at an arbitrary position (FIG. 1, see FIG. 2).

As described above, according to the seat belt through guide structure 10 of the present invention, the through guide 12 is attached to the seat back 14 so as to be movable up and down, and the vertical position of the through guide is controlled by the drive control of the motor M. Is adjusted arbitrarily. That is, for example, as can be seen by comparing FIG. 3 exemplifying a sitting state of an adult and FIG. 5 exemplifying a sitting state of a child, according to the body shape of the seated person, that is, the height of the shoulder of the through guide 12, By adjusting the vertical position, the holding angle of the shoulder belt 16a suitable for the body shape of the seated person can be easily obtained.

Therefore, the holding angle of the portion from the shoulder to the chest of the seated person by the shoulder belt 16a of the seat belt is
It can be easily adjusted and set according to the body shape of the seated person, the fit of the shoulder belt to the upper body of the seated person is improved, and the comfort and safety of the seated person are improved.

Further, in such a structure, since the through guide 12 is provided on the shoulder portion of the seat back 14, the through guide 12 moves integrally with a change in the inclination angle (reclining angle) of the seat back. That is, as can be seen by comparing FIG. 6 exemplifying the reclining angle of the seat back 14 in the normal seated state and FIG. 7 exemplifying the reclining angle when tilting backward, even if the seat back is largely tilted backward, The shoulder belt 16a of the belt moves with the upper body of the seated person.

Therefore, even if the reclining angle of the seat back 14 is changed, the shoulder belt 16a of the seat belt does not separate from the seated person's shoulder and chest, and a good fit is obtained regardless of the reclining angle of the seat back. Of the shoulder belt, and also in this respect, the fit of the shoulder belt to the upper body of the seated person is improved.

According to the present invention, the retractor 2
2. Since the floor anchor 28 and the like are provided on the vehicle body, it is not necessary to increase the rigidity of the seat back frame 32. Therefore, the seat back frame 32 is increased in size,
It is possible to sufficiently prevent the structure from becoming complicated and the weight of the seat back 14 as a whole to be increased.

Here, in the embodiment, the through guide
12 is projected on the shoulder side surface of the seat back 14,
It is sufficient if the seat belt 16 can be loosely inserted and supported. Therefore, the present invention is not limited to this. For example, a through guide may be provided so as to project from the front surface of the shoulder portion of the seat back.

The regulating means 42 is a lead screw 44.
However, it is sufficient if the through guide 12 is moved up and down in conjunction with the driving of the motor M, and the present invention is not limited to this. May be configured.

In the embodiment, the through guide 12 is moved up and down under the drive control of the motor M.
The present invention is not limited to this, and for example, the vertical position of the through guide may be adjusted stepwise by a manual type regulation means having a lock mechanism or the like.

However, in the structure in which the through guide 12 is moved up and down by the combination of the lead screw 44 and the nut 46 which are interlocked with the drive of the motor M, the through guide can be smoothly moved up and down, and the vertical position of the through guide is not required. Since the shoulder belt 16a can be adjusted in stages, the fit of the shoulder belt 16a to the upper body of the seated person is further improved.

In this embodiment, the seat belt 16 is arranged on the right side of the front of the seat 18, and the through guide 12 is provided on the right shoulder of the seat back correspondingly. However, conversely, the present invention may be applied to a configuration in which the seat belt is disposed on the front left side of the seat. In this case, corresponding to the seat belt,
It goes without saying that the through guide 12 is provided on the left front side of the seat 18.

Although the seat belt through guide structure of the present invention is suitable for an assistant seat, the present invention is not limited to this, and the present invention can be applied to other seats such as a driver seat and a rear seat.

Further, the present invention is not limited to the seat for automobiles as long as the seat is fitted with a seat belt, and the present invention may be applied to seats for trains, airplanes, ships, etc., for example.

The above-mentioned embodiments are for explaining the present invention and do not limit the present invention in any way.
It goes without saying that the present invention includes all those which are modified or modified within the technical scope of the present invention.

[0057]

As described above, according to the seat belt through guide structure of the present invention, the vertical position of the through guide can be arbitrarily adjusted. Therefore, the holding angle of the portion from the shoulder of the seated person to the chest by the shoulder belt of the seat belt is easily adjusted according to the body shape of the seated person,
It can be set, and the fit of the shoulder belt to the upper body of the seated person is improved, and the comfort and safety of the seated person are improved.

Since the upper end of the shoulder belt of the seat belt is supported by the through guide, the shoulder belt moves following the swing of the seat back. Therefore, even if the reclining angle of the seat back is changed, the shoulder belt of the seat belt does not separate from the seated person's shoulder and chest,
A good fit can be secured regardless of the reclining angle of the seat back, and also in this respect, the fit of the shoulder belt to the seated person is improved.

Further, according to the present invention, since the retractor, the floor anchor and the like are provided on the body of the automobile,
There is no need to increase the rigidity of the seat back frame. Therefore, it is possible to sufficiently prevent an increase in size of the seatback frame, a complicated structure, and an increase in the weight of the seatback as a whole.

Further, if the regulating means is constituted by the combination of the lead screw which can be interlocked with the motor and the nut which can be screwed with the lead screw, the vertical position of the through guide can be set steplessly. Therefore, the support angle of the shoulder belt suitable for the body shape of the seated person can be easily obtained, and the comfort and safety of the seated person are further improved.

[Brief description of drawings]

FIG. 1 is a schematic front view of a through guide structure for a seat belt according to the present invention.

FIG. 2 is a schematic perspective view of a seat to which a seat belt and a through guide are attached.

FIG. 3 is a front view of the seat when the seat belt is worn, at the upper limit position of the through guide.

FIG. 4 is a schematic perspective view of a through guide structure for a seat belt.

FIG. 5 is a front view of the seat when the seat belt is worn, at the lower limit position of the through guide.

FIG. 6 is a side view of the seat when the seat belt is worn in a normal seated state.

FIG. 7 is a side view of the seat when the seat belt is worn when the seat back is tilted backward.

[Explanation of symbols]

 10 Seat belt through guide structure 12 Through guide 14 Seat back 16 Seat belt 16a Shoulder belt 18 Seat (assistant seat) 22 Retractor 24 Upper support member (intermediate plate) 26 Tongue 36 Guide rod 42 Restrictor 44 Lead screw 46 Nut

Claims (2)

[Claims] 1. An end of a seat belt in which a tongue that can be inserted into a buckle on the opposite side of the seat is loosely inserted is extended from a retractor in a body through an upper support member,
The through guide, which is connected to the floor anchor on the same side of the seat and loosely inserts and supports the shoulder belt of the seat belt defined between the upper support member and the tongue, is either the side surface or the front surface of the shoulder portion of the seat back. The seat belt through guide structure is configured so that it can be lifted up and down, and that the lifting and lowering of the through guide can be restricted by the restricting means. 2. The through guide is mounted so as to be able to move up and down along the axis of a guide rod that is erected on the seat back frame, and the restricting means is a lead screw that can be linked to the drive of the motor; A nut that can move up and down together with the through guide; and the nut moves in the axial direction of the lead screw as the lead screw rotates in conjunction with the driving of the motor. The through-guide structure for a seat belt according to claim 1, which moves up and down along a rod.