JP2004016708A - Seat back for vehicles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple and inexpensive structure capable of mitigating the damage of a sitting person at the time of a back collision in a seat back for vehicles. <P>SOLUTION: The respective lower end parts of both side frames 22 are connected through a reclining device 50 to a seat part 10. An upper frame 23 is disposed between the upper end parts of the side frames 22 and a lower frame 24 is disposed between the lower end parts. A frame body 25 extended to the left and right of the lower frame 24 can be curved and deformed in a rear direction by an impact load at the time of the back collision. The frame body 25 is provided with a rib 27 (impact absorbing means) capable of being buckled and deformed by the impact load. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seatback in which a reclining device is provided on both the left and right sides, and a seatback that can reduce the damage of a seated occupant in a rear collision including a collision in a rear-end collision or a reverse movement.
[0002]
[Prior art]
2. Description of the Related Art As a conventional vehicle seat for rear-end collision, for example, a seat in which a headrest slides forward due to a rear-end collision to reduce a whiplash of a seated person is known.
[0003]
[Problems to be solved by the invention]
The above-mentioned conventional seat having the headrest / slide structure has a problem that the mechanism is complicated, manufacturing is not easy, and the price is high.
[0004]
[Means for Solving the Problems]
By the way, the vehicle seat has a reclining device provided on one of the left and right sides of the seat back, and the other has a free-hinge one-side reclining system, and a two-sided reclining system provided with reclining devices on both left and right sides. There is. The reclining device has a built-in locking means for locking the seat back at a desired inclination angle. When the occupant leans on the seat back, the load is transmitted to the seat via the reclining device in the locked state. On the other hand, the free hinge does not transmit such force. Therefore, in the one-side reclining method, the lower frame of the seat back is twisted, and the lower frame is required to have a large strength capable of facing the lower frame. On the other hand, in the two-sided reclining method, since a force can be received on both the left and right sides, the torsion does not work and the lower frame does not require much strength. The present invention pays attention to this point and provides a shock absorbing function instead of strength to the lower frame under the double-sided reclining method.
[0005]
That is, a first feature of the present invention is that a pair of left and right side frames extending vertically and having lower ends respectively connected to a seat portion via a reclining device so as to be adjustable in angle, and is provided between upper end portions of these side frames. A vehicle seat back having a passed upper frame and a lower frame bridged between lower ends thereof, wherein the lower frame extends left and right and both ends are connected to the side frame and a rear collision occurs. A frame body that can be bent backward by an impact load at the time, and an impact absorbing means provided on the frame body to absorb the impact load. According to the first feature, at the time of a rear collision, the shock is absorbed by the frame body of the lower frame being bent and deformed. In addition, the shock absorbing means absorbs the shock. Thereby, the damage of the seated person can be reduced. The lower frame has a simple structure and can be manufactured at low cost.
[0006]
According to a second aspect of the present invention, in the first aspect, the impact absorbing means has a vertical plate shape thin enough to be buckled by the impact load, extends in the front-rear direction, and extends the frame main body. The ribs and the frame main body are integrally formed of resin. According to the second feature, the buckling deformation of the rib can absorb a greater impact, and can more reliably prevent the occupant from being damaged. Moreover, the frame body can be reinforced by the ribs.
[0007]
In a third aspect of the present invention, in the second aspect, the frame main body is formed in a thin horizontal plate shape capable of being buckled by the impact load, extends left and right, and is vertically separated from each other. A plurality of long plate portions, and the ribs are arranged so as to connect these long plate portions between vertically adjacent long plate portions. According to the third feature, a greater impact absorption can be performed by the buckling deformation of the long plate portion of the frame body, and damage to the occupant can be more reliably prevented.
[0008]
According to a fourth aspect of the present invention, in the first aspect, the frame main body has a long plate portion made of resin or sheet metal extending left and right with a width direction being perpendicular to the right and left, and the shock absorbing means is provided with: A foamed resin layer provided on the front side surface of the long plate portion and crushable by the impact load. This crushing of the foamed resin layer allows greater impact absorption, and more reliably prevents damage to the occupant.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a vehicle seat S1 according to a first embodiment of the present invention. The seat S <b> 1 includes a seat 10, a seatback 20 provided at a rear portion of the seat 10, and a headrest 40 provided at an upper end of the seatback 20.
[0010]
As shown in FIGS. 1 and 2A, the seat back 20 includes a frame unit 21 forming a skeleton, a cushion pad 30 supported by the frame unit 21, and a skin 31 wrapping the whole. . The frame unit 21 includes a pair of left and right side frames 22, an upper frame 23 bridged between upper end portions of the side frames 22, and a lower frame 24 bridged between lower side portions according to the main part of the present invention. It is composed of The side frame 22 made of sheet metal has a U-shaped cross section and extends vertically, and has a narrow upper end and a wide lower end. The wide lower ends of the left and right side frames 22 are connected to the seat 10 via reclining devices 50, respectively. As is well known, the reclining device 50 has a built-in locking means interlocked with the lever (not shown in detail). When the locking means is released by the lever, the side frame 22 and thus the seat back 20 can be tilted. When the lever is released, the lock is applied and the seat back 20 can be fixed at a desired inclination angle.
[0011]
The upper frame 23 made of a metal round pipe extends to the left and right, and both ends are vertically bent downward and connected to the narrow upper end of the side frame 22 by welding. An S-shaped spring 39 is provided between the vertical portions at both ends of the upper frame 23 and between the left and right side frames 22.
[0012]
The lower frame 24 according to the main part of the present invention will be described.
The lower frame 24 is made, for example, by injection molding a resin such as polypropylene, and is arranged at a height just in contact with the waist of the occupant A. The lower frame 24 includes a frame body 25 extending left and right, a pair of connecting portions 26 integrally formed on both ends of the frame body 25, and a rib 27 (shock absorbing means) integrally formed on the frame body 25. ing. A nut 28 is embedded in the connecting portion 26 by insert molding. When the bolt 29 is screwed into the nut 28, the lower frame 24 is connected to the side frame 22.
[0013]
As shown in FIG. 3A, the frame body 25 has a thin rear wall 25a extending left and right with the width direction being vertical, and horizontally projects forward from upper and lower edges and an intermediate portion of the rear wall 25a. And a three-stage thin long plate portion 25b extending left and right, and has a cross section of "Y" shape. As shown in FIGS. 1 and 2A, the rear wall 25a has an arc shape in a plan view in which a central portion in the extending direction is slightly curved rearward. Following this, the long plate portion 25b also has an arc shape in plan view. As shown in FIG. 2B and FIG. 3B, the rear wall 25a is elastically deformed so as to be further greatly curved rearward when an impact force is applied from the front. When a larger impact force is applied, the long plate portion 25b buckles.
[0014]
As shown in FIGS. 1, 2A, and 3A, the ribs 27 are provided between the upper and middle long plate portions 25b and between the middle and lower long plate portions 25b. The plurality of ribs 27 are arranged apart from each other in the direction in which the frame body 25 extends. Each rib 27 has a vertical thin plate shape extending in the front-rear direction, the rear edge is integrally connected to the wall 25a, and the upper and lower edges are each integrally connected to the long plate portion 25b. The ribs 27 reinforce the vertical strength of the frame body 25.
[0015]
According to the seat back 20 configured as described above, when the occupant A leans, the load is received by the frame unit 21, particularly the upper frame 23 and the side frame 22, and the reclining device 50 in the locked state on both sides is further received. Can be transmitted to the seat 10 via the Thereby, the seated person A can be supported. At this time, the leaning load of the occupant A hardly acts on the lower frame 24. In addition, since both sides are reclined, there is no twist. Therefore, there is no problem even if the lower frame 24 is made of an elastic resin. Moreover, since the lower frame 24 is composed of the frame main body 25 and the ribs 27 each having a "Y" -shaped cross section, it is possible to sufficiently clear the minimum strength required for the lower frame of the double-sided reclining type.
[0016]
As shown in FIGS. 2B and 3B, at the time of a rear collision, the impact causes the waist of the occupant A to sink into the seat back 20, and the lower frame 24 is moved through the cushion pad 30 and the S-shaped spring 39. Press backward. This impact causes the lower frame body 25 to bend and deform rearward. Thereby, the impact can be absorbed and the damage of the occupant A can be reduced. When the impact of the rear collision is further large, the rib 27 is buckled and deformed. In addition, the long plate portion 25b is buckled and deformed. Thereby, the impact can be more greatly absorbed. As a result, it is possible to reliably prevent the occupant A from being damaged.
[0017]
Next, a second embodiment of the present invention will be described. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals in the drawings, and description thereof will be omitted.
As shown in FIGS. 4, 5A, and 6A, in the vehicle seat S2 according to the second embodiment, the configuration of the lower frame 60 of the seat back 20 is different from that of the first embodiment. That is, the lower frame 60 includes a frame body (long plate portion) 61 made of sheet metal and a foamed resin layer 62. The frame main body 61 has a long plate shape extending left and right with the width direction perpendicular to the center, and has a central portion curved backward in an arc shape. Both ends of the frame main body 61 are bent at right angles to form a connecting portion 63. The connecting portion 63 is connected to the inner surface of the side frame 22 by welding.
[0018]
The foamed resin layer 62 is bonded to the front side surface of the frame main body 61 with an adhesive or a double-sided tape. The foamed resin layer 62 is formed by, for example, foaming polypropylene foam beads 45 times, and extends over substantially the entire length of the frame main body 61.
[0019]
As shown in FIGS. 5 (b) and 6 (b), at the time of a rear collision, the lower frame main body 61 is elastically deformed so as to be further curved rearward due to the seating of the occupant A. In addition, the foamed resin layer 62 functions as a cushion. Thereby, the impact can be absorbed and the damage of the occupant A can be reduced. When the impact of the rear collision is further large, the foamed resin layer 62 is buckled and crushed. As a result, the impact can be more greatly absorbed, and the occupant A can be prevented from being damaged.
[0020]
The present invention is not limited to the above embodiment, and can be appropriately modified. For example, in the lower frame 24 of the first embodiment, the middle long plate portion 25b may be omitted to form a U-shaped cross section. Further, the rear wall 25a may be omitted and only the long plate portions 25b of a plurality of stages may be provided.
In the lower frame 60 of the second embodiment, the frame body 61 may be formed of a resin such as polypropylene instead of a sheet metal.
[0021]
【The invention's effect】
As described above, according to the present invention, at the time of a rear collision, the impact is absorbed by the frame body of the lower frame being bent and deformed. In addition, a shock absorbing means such as a rib or a foamed resin layer absorbs the shock. Thereby, the damage of the seated person can be reduced. The lower frame has a simple structure and can be manufactured at low cost.
[Brief description of the drawings]
FIG. 1 is a perspective view of a vehicle seat according to a first embodiment of the present invention.
2A is a cross-sectional view showing the vehicle seat in a normal state, taken along a line II-II in FIG. 1;
(B) It is sectional drawing which shows the said vehicle seat deformed by the rear collision along the II-II line of FIG.
FIG. 3A is a cross-sectional view showing a lower frame of the vehicle seat in a normal state along a line III-III in FIG. 1;
(B) FIG. 3 is a cross-sectional view showing the lower frame of the vehicle seat deformed by a rear collision along the line III-III in FIG. 1, and shows a state before the deformation by a virtual line for reference.
FIG. 4 is a perspective view of a vehicle seat according to a second embodiment of the present invention.
5 (a) is a cross-sectional view showing the vehicle seat of the second embodiment in a normal state along line VV in FIG. 4;
(B) It is sectional drawing which shows the vehicle seat of 2nd Embodiment deformed by the rear collision along the VV line of FIG.
6A is a cross-sectional view showing the lower frame of the vehicle seat of the second embodiment in a normal state along the line VI-VI in FIG. 4;
(B) is a cross-sectional view showing the lower frame of the vehicle seat of the second embodiment deformed by a rear collision along the line VI-VI in FIG. 4, and shows a state before deformation by a virtual line for reference.
[Explanation of symbols]
S1, S2 Vehicle seat 10 Seat portion 20 Seat back 21 Frame unit 22 Side frame 23 Upper frame 24 Lower frame 25 Lower frame body 25a Rear wall 25b Long plate portion 27 Rib 50 Reclining device 60 Lower frame 61 Frame body (long plate portion) )
62 foam resin layer

Claims (4)

A pair of left and right side frames that extend vertically and are connected at their lower ends to the seat via a reclining device so as to be adjustable in angle, an upper frame spanned between the upper ends of these side frames, and between the lower ends. A vehicle seat back including a bridged lower frame, wherein the lower frame extends left and right and both ends are connected to the side frames, and can be bent rearward by an impact load at the time of a rear collision. A vehicle seat back comprising: a frame main body; and a shock absorbing means provided on the frame main body to absorb the shock load. The shock absorbing means is formed of a plurality of ribs arranged in a vertical plate shape thin enough to be buckled by the shock load and extending in the front-rear direction and separated from each other in the direction in which the frame body extends. The vehicle seat back according to claim 1, wherein the rib and the frame body are integrally formed of resin. The frame body has a plurality of long plate portions extending in the horizontal direction in a horizontal plate shape thin enough to be buckled by the impact load and arranged vertically apart from each other, and vertically adjacent to each other. 3. The vehicle seat back according to claim 2, wherein the ribs are arranged so as to connect the long plate portions between the portions. The frame body has a long plate portion made of resin or sheet metal extending left and right with the width direction being vertical, and the shock absorbing means is provided on a front side surface of the long plate portion and crushed by the shock load. The vehicle seat back according to claim 1, wherein the seat back is a foamable resin layer.

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