JPH0664545U - Seat device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the displacement of the backrest point of the occupant and the occupant support point of the seat back during reclining as much as possible without causing design restrictions and deterioration of occupant support performance. . [Structure] A seat back 2 can be bent through an upper seat back 3 rotatably supported by a turning fulcrum shaft 15 that substantially coincides with a hip point P of an occupant M and a lower end portion of the upper seat back 3 via a pivot pin 19. The lower seat back 4 is divided into the upper seat back 3 and the lower seat back 4 connected to the upper seat back 3 at the standard position. Is tilted backward from the standard position, the lower seat back 4 is bent toward the back side of the seat back 2 and the seat cushion 1
A guide mechanism X that guides the movement of the lower seat back 4 so as to pass through the rear side of the rear end portion and retract to the lower side thereof.
Equipped with.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seat device, and more particularly to a seat device having a reclining mechanism.

[0002]

[Prior art]

 In a conventional seat device with a reclining mechanism, the hip point, which is the center of rotation of the occupant, and the center of rotation of the seat back are misaligned, and therefore the backrest point of the occupant and the backrest point are supported during reclining. The relative position of the seat back to the occupant support point changes, and for example, when the seat back is tilted backward from its standard position to the last tilted position, the occupant's back is pulled upward by the seat back, On the contrary, when the seat back is raised from the rearmost tilt position to the standard position side, the back of the occupant is pulled down by the seat back, and as a result, the occupant feels pressure from the seat back side when reclining, and There were also wrinkles on the back.

As a solution to such inconvenience, for example, as disclosed in Japanese Patent Publication No. 52-37427, a technique has been proposed in which the hip point of the occupant and the center point of rotation of the seat back coincide with each other. There is.

By the way, when the hip point of the occupant and the rotation center point of the seat back are made to coincide with each other in this way, since the rotation center point is located considerably in front of the rear end portion of the seat cushion, for example, When the lower end of the seat back is positioned at the rear end of the seat cushion with the seat back set to the standard position, the rear end of the seat cushion and the seat back are recoiled when the seat back reclines toward the final tilt position. It interferes with the lower end of the to make the reclining operation impossible. Therefore, in order to avoid such interference at the time of reclining, it is customary to cut out a part of the lower end portion of the seat back as in the above-mentioned known example.

[0005]

[Problems to be solved by the device]

 However, when a part of the lower end of the seat back is cut out in order to avoid interference with the seat cushion in this manner, the lower end of the seat back and the lower end of the seat back are set in the standard position. A relatively large gap is created between the seat cushion and the seat, which is disadvantageous in terms of design, and there is a problem that the seating feeling is deteriorated due to insufficient support performance of the hips of the occupant.

Therefore, the present invention prevents the displacement of the backrest point of the occupant and the occupant support point of the seat back during reclining as much as possible without causing a restriction in design and deterioration of occupant support performance. It was made as an attempt to provide a seating device that could be used.

[0007]

[Means for Solving the Problems]

 In the present invention, as a concrete means for solving such a problem, the seat cushion is tilted in the front-rear direction through a pivot shaft provided at the rear end portion of the seat cushion so as to substantially match the hip point of the occupant on the seat cushion side. In a seat device in which a seat back is attached as much as possible, the seat back constitutes an occupant's backrest, and an upper seat back rotatably supported by the pivot shaft and a lower end of the upper seat back. The upper seat back is erected while the upper seat back and the lower seat back are connected to each other via a pivot pin provided on the rear side of the seat back so as to be bendable and can be fitted to the occupant's hips. In the standard position of the seat back, the lower seat back is continuously connected to the lower end of the upper seat back. While forming the same seat back surface together with the seat back, when the upper seat back is tilted backward from its standard position to the last tilted position, the lower seat back is attached to the rear side of the upper seat back. A guide mechanism for guiding the movement of the lower seat back so that the seat cushion is bent downward and is retracted to the lower side of the seat cushion through the rear side of the rear end of the seat cushion. It is something.

[0008]

[Action]

 According to the present invention, by adopting such a configuration, the lower seat back is continuously connected to the lower end portion of the upper seat back by the guide mechanism to form the same seat back surface when the seat back is set to the standard position. Therefore, no gap is created between the seat back and the seat cushion, and the lower seat back supports the occupant's hip in an appropriate state.

On the other hand, when the seat back is tilted backward, the upper seat back rotates about a rotation fulcrum shaft which is arranged at a position substantially matching the occupant's hip point. There is almost no misalignment between the point and the backrest point of the occupant, which prevents the occupant from feeling pressure from the upper seat back side and wrinkles on the back part of the occupant's clothing. It is something.

Further, in this case, the lower seat back is guided by the guide mechanism along with the rearward tilting operation of the upper seat back, and is bent toward the rear side of the seat back while the rear side of the rear end portion of the seat cushion is being moved. The lower seat back and the seat cushion are reliably prevented from interfering with each other by being moved through to the lower surface side.

[0011]

[Effect of device]

 Therefore, according to the seat device of the present invention, when the seat back is set to the standard position, the lower seat back is continuously connected to the lower end of the upper seat back to form a gap between the seat back and the seat cushion. On the other hand, when the seat back is tilted, the lower seat back is bent to the rear side of the upper seat back and retracted to the lower side of the seat cushion to reliably avoid interference between the seat back and seat cushion. Therefore, there is no gap between the seat back and the seat cushion when the seat back is set at the standard position as in the conventional seat device, and the seat back is set at the standard position. The rider's hips look good, the occupant's hips are properly supported, and the seatback is Over's reclining operation is ensured, in which attained the compatibility between design properties and practical performance of the seat device.

[0012]

【Example】

 Hereinafter, the seat device of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a seat device Z for a train according to an embodiment of the present invention. The seat device Z is a seat cushion 1 arranged between a pair of left and right side wall members 5, 5 which also functions as an armrest, and a seat cushion 1 attached to the rear end of the seat cushion 1 to be described later. And a seat back 2 of.

The seat back 2 has an upper and lower half-split structure including an upper seat back 3 which will be described later, which constitutes a backrest portion of the occupant M, and a lower seat back 4 which corresponds to a butt portion of the occupant M. The upper seatback 3 has a "U-shaped" upper seatback frame 11 attached to a support bar 13 provided laterally at the lower end thereof. Further, as shown in FIGS. 1 and 2, both ends of the support bar 13 are projected into the inside of the side wall members 5 and 5, and the swing levers 14 each having a predetermined length are provided at the projecting ends. , 14 are fixed. Further, one end of each rocking lever 14, 14 has a pair of left and right attached coaxially in the seat width direction via a bracket 16 provided on the inner surface of the inner wall surface 5a, 5a of the side wall member 5, 5. The fulcrum shafts 15 and 15 are rotatably supported. Further, one end of a lock mechanism 20 attached to the inside of the side wall member 5 via a bracket 22 is connected to one of the pair of swing levers 14 and 14. There is.

Therefore, the upper seat back 3 operates the lock operation knob 21 provided on the front surface of the side wall member 5 to release the lock action of the lock mechanism 20 to release the above-described rotation fulcrum shafts 15, 15. As shown in FIG. 3, the upper seat back 3 is tilted rearward so that the upper seat back 3 extends to the standard position where it is substantially upright and the rear side of the seat cushion 1 as shown in FIG. It is possible to tilt between the upper and lower positions of the last tilted position, and the posture is maintained at a predetermined tilted position by stopping the operation of the lock operation knob 21 and setting the lock mechanism 20 in the locked state. Becomes In FIG. 1, reference numeral 7 is an escape groove provided on the inner wall surface 5a of the side wall member 5 to allow the rotation of the support bar 13.

By the way, in this embodiment, the positions of the respective pivotal fulcrum shafts 15, 15 and the relative mounting positions of the respective rocking levers 14, 14 with respect to the upper seatback frame 11 and the rocking levers 14 are described. The length dimensions of are set as follows. At first, the rotation fulcrum shaft 15 is attached at the mounting position. In this embodiment, the rotation fulcrum shaft 15 is made to coincide with the hip point P of the occupant M seated on the seat cushion 1. The mounting position is set. As for the length of the swing lever 14 and the mounting position of the swing lever 14 relative to the upper seatback frame 11, the upper seatback 3 is set to the standard position as shown in FIG. In this state, the lower end of the upper seat back 3 is positioned above the pivot shaft 15 to form a predetermined gap between the lower end of the upper seat back and the seat cushion 1, and the upper seat back is formed. As shown in FIG. 5, the lower end of the upper seat back 3 is appropriately set so as to be close to the rear end of the seat cushion 1 when the seat 3 is set to the rearmost tilt position. When the upper seat back 3 is set in the standard position, a lower seat back 4 described later is provided to fill the gap formed in the standard position, and when the upper seat back 3 is set in the final tilted position. In order to remove the lower seat back 4 from the lower end side of the upper seat back 3 and retract it to the lower side of the seat cushion 1, a guide mechanism X described later is provided.

The lower seat back 4 is located at the lower end portion of the seat back 2 and functions to support the hips of the occupant M. As shown in FIGS. 1 and 2, the lower seat back 4 is bent into a substantially rectangular shape. A bent lower seat back frame 12 is provided. The lower seatback frame 12 has a pair of left and right brackets 18, 18 provided on the upper end portion thereof in a state of extending rearwardly extending rearwardly to the support bar 13 on the upper seatback 3 side. By connecting the pair of left and right brackets 17 and 17 provided in this state via pivot pins 19 and 19, respectively, the rear side of the upper seat back 3 can be bent with its back side as a folding center. It is supported.

As shown in FIG. 3, the lower seat back 4 continues to the lower end of the upper seat back 3 when the upper seat back 3 is set in the standard position. 3 and 3 form the same seat back surface, and the lower end thereof is brought close to the rear end of the seat cushion 1 (hereinafter, the posture of the lower seat back 4 in this case is referred to as an in-use posture). On the other hand, as shown in FIG. 5, when the upper seat back 3 is set to the rearmost tilted position, the lower seat back 4 has the rear seat side of the upper seat back 3 around the pivot pin 19. The upper seat back 3 and the seat cushion 1 are bent downward to be positioned below (the posture of the lower seat back 4 in this case is referred to as a retracted posture).

As described above, the lower seat back 4 moves between the in-use posture and the retracted posture corresponding to the rotational position of the upper seat back 3, whereby the seat back 2 and the seat cushion are set at the standard position. It is possible to prevent a useless gap from being formed between the seat back 1 and the seat 1 and to prevent the seat back 2 and the seat cushion 1 from interfering with each other when the final tilt position is set, thereby enabling a smooth reclining operation. is there. Then, the proposed mechanism X, which will be described later, realizes such an operation of the lower seat back 4.

The guide mechanism X includes a pair of left and right guide pins 9 and 9 provided at the left and right ends of the lower end portion of the lower seat back frame 12 so as to extend outward in the width direction, respectively, and the side wall member. 5 is formed on the inner wall surface 5a of the inner wall 5 and is formed with guide grooves 8 and 8 into which the guide pins 9 are inserted. The shape of the guide grooves 8 and 8 is such that when the pivot pin 19 is pivotally rotated as the upper seat back 3 tilts, for example, the upper seat back 3 moves from the standard position shown in FIG. When moving to the final tilt position shown in Fig. 4, the lower seat back 4 in the in-use posture is bent to the back side as in the intermediate position shown in Fig. 4 while passing it through the rear end side of the seat cushion 1 and its lower surface side. When the upper seat back 3 is moved from the rearmost tilted position to the standard position, the lower seat back 4 in the retracted position is unfolded next while the seat cushion 1 is moved to the standard position. It has a shape that allows it to move to the upper surface side through the vicinity of the rear end and reach the standard position so that it can be continuously set to the lower end of the upper seat back 3 and set in the in-use posture. Has been.

Thus, the upper seat back 3 and the lower seat back 4 are divided into two parts, and the posture of the lower seat back 4 corresponds to the tilt of the upper seat back 3 between the use posture and the retracted posture. According to the seat apparatus Z having the seat back 2 controlled by the above, first, in the standard position, the upper seat back 3 and the lower seat back 4 are integrated to form one seat back 2 and Since there is no gap between the lower seat back 4 and the seat cushion 1, for example, as in the above-mentioned known example, there is a gap between the seat back 2 and the seat cushion 1 in the standard position setting state. Compared to the case, the appearance is improved and the design is improved, and the lower seat back 4 securely supports the butt portion of the occupant M. If the feeling is good, it is possible.

On the other hand, at the time of reclining the seat back 2, the position of the rotation fulcrum shaft 15 which is the center of rotation of the upper seat back 3 forming the backrest of the occupant M is the hip point P of the occupant M on the seat cushion 1 side. 3 to 5, the seat between the backrest point of the occupant M and the support point of the occupant M of the upper seatback 3 is irrespective of the tilting of the seatback 2, as shown in FIGS. The relative position in the up-and-down direction is maintained substantially constant, and it is possible to reliably prevent the occupant M from feeling useless and wrinkles on the clothes.

Further, particularly when the upper seat back 3 tilts from the standard position to the final tilt position side, the lower seat back 4 corresponds to the tilting motion of the upper seat back 3 and the upper seat back 3 moves. Since a moving space is formed between the lower end of the upper seat back 3 and the rear end of the seat cushion 1 by bending to the rear side of the seat cushion 1, the reclining action is not hindered by the interference between the two. It enables smooth reclining operation.

[Brief description of drawings]

FIG. 1 is a perspective view of a seat device according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view of a II-II portion of FIG.

FIG. 3 is an operation explanatory view of the seat device shown in FIG.

FIG. 4 is a state change diagram of the seat device shown in FIG.

5 is a state change of the seat device shown in FIG.

[Explanation of symbols]

1 is a seat cushion, 2 is a seat back, 3 is an upper seat back, 4 is a lower seat back, 5 is a side wall member, 7
Is an escape groove, 8 is a guide groove, 9 is a guide pin, 11 is an upper seat back frame, 12 is a lower seat back frame, 13 is a support bar, 14 is a swing lever, 15 is a pivot shaft, 16 is a bracket, 17 is a bracket, 18 is a bracket, 19 is a pivot pin, 20 is a lock mechanism, 21 is a lock operation knob, 22 is a bracket, M is an occupant, P is a hip point, X is a guide mechanism, and Z is a seat device.

Claims (1)

[Scope of utility model registration request] 1. A seat device in which a seat back is attached to a rear end portion of a seat cushion so as to be tiltable in the front-rear direction via a pivot shaft provided substantially in line with a hip point of an occupant on the seat cushion side. The seat back comprises an upper seat back that constitutes a backrest portion of an occupant and is rotatably supported by the rotation fulcrum shaft, and is provided at a lower end portion of the upper seat back on the back side of the seat back. At the standard position of the seat back where the upper seat back is erected, the upper seat back and the lower seat back are connected to each other via a pivot pin so as to be bendable and are formed separately from each other. The lower seat back is connected to the lower end of the upper seat back to form the same seat back surface together with the upper seat back. On the other hand, when the upper seat back is tilted backward from the standard position to the last tilted position, the lower seat back is bent toward the back side of the upper seat back and the rear end portion of the seat cushion is bent. A seat device comprising a guide mechanism for guiding the movement of the lower seat back so as to be retracted to the lower side of the seat cushion through the rear side.