JP4373576B2 - Non-whipping structure for vehicle seats - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for preventing whiplash generated at the time of a vehicle collision.
[0002]
[Prior art]
When the vehicle is collided, the waist of the occupant sitting on the seat is pushed forward together with the vehicle, and the upper body moves relatively backward. At this time, the head of the occupant may greatly warp backward, resulting in whiplash.
[0003]
Therefore, various developments have been made to prevent the above whiplash. For example, there is a structure in which a link mechanism is provided on the backrest so that the headrest protrudes forward when an occupant is pressed against the backrest at the time of a collision. In addition, there is a type in which the headrest protrudes relatively forward with respect to the backrest by largely bending the pad of the backrest. In this way, the occupant's head is prevented from largely warping backward with respect to the upper body supported by the backrest, thereby preventing whiplash.
[0004]
[Problems to be solved by the invention]
As described above, the structure in which the headrest protrudes forward requires a complicated link mechanism, and has a drawback that it causes a significant increase in cost. In addition, the structure that increases the amount of deflection of the backrest pad requires a special pad, which also has the disadvantage that it leads to a significant cost increase, and that the pad sags due to long-term use and the effect is halved. It was.
[0005]
[Means for Solving the Problems]
To solve the above problems, the present invention includes a backrest, in the vehicle seat with a headrest supported on the backrest, the backrest, and the main frame, the front-rear direction times the upper portion of the main frame An upper frame that is movably attached and a biasing member that pivotally biases the upper frame toward the front locking position, and a support that extends downward from the headrest is disposed at the top of the main frame in the front-rear direction. The upper frame has an inverted U-shape, the lower ends of the left and right parts thereof are rotatably attached to the upper part of the main frame, and the upper part of the upper frame fixes the support. It is arranged between the upper part of the main frame and the headrest.
[0006]
Preferably, the support of the headrest has a rod shape, and an elongated hole extending in the front-rear direction is formed in the upper frame, the support is inserted into the elongated hole, and the upper frame is moved forward by a biasing member. The rear end of the elongated hole is locked to the support and is in the forward locking position, and the front end of the elongated hole is locked to the support when subjected to an impact load from the occupant. It reaches the stop position.
Preferably, the urging member comprises a torsion spring, and the torsion spring is wound around at least one of the left and right shaft members respectively connecting the lower ends of the left and right portions of the upper frame to the upper portion of the main frame.
Preferably, the upper portion of the main frame has left and right shoulder portions and a central top portion higher than the shoulder portions, and lower ends of the left and right portions of the upper frame are rotatably attached to the left and right shoulder portions, The support is fixed to the center top.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a whiplash preventing structure for a vehicle seat according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 5, the vehicle seat includes a seat portion 1, a backrest 2 connected to the seat portion 1 so as to be adjustable in angle, and a headrest 3 supported on the upper end of the backrest 2. Yes.
[0008]
As shown in FIG. 1, the skeleton of the backrest 2 includes a main frame 10 and an upper frame 20 that is connected to the upper portion of the main frame 10 so as to be pivotable in the front-rear direction. A backrest 2 is configured by attaching a wave spring or pad to the skeleton and covering it with an epidermis.
[0009]
The upper part of the main frame 10 is composed of a pipe 11, and the pipe 11 has left and right shoulder portions 11a and a top portion 11b protruding upward from the shoulder portions 11a. Brackets 12 and 13 are fixed to the shoulder portions 11a. The upper frame 20 has a plate material formed in an inverted U shape, and the lower ends of the left and right side plate portions are rotatably connected to the brackets 12 and 13.
[0010]
The connection structure of the upper frame 20 will be described in detail. The connection structure on the left side when viewed from the front is configured as shown in FIG. That is, a hole 21 is formed at the lower end of the side plate portion of the upper frame 20, a hole (not shown) is formed in the bracket 12 correspondingly, and a nut 14 is fixed to the back surface thereof. . This connection structure further includes a stepped bolt 15 (shaft member). With the lower end of the side plate portion of the upper frame 20 aligned with the bracket 12, the shaft portion 15 a of the stepped bolt 15 is inserted into the hole 21 of the upper frame 20 and the hole of the bracket 12, and the screw portion 15 b is attached to the nut 14. By screwing, the upper frame 20 is rotatably connected to the bracket 12.
[0011]
The connection structure on the right side when viewed from the front is configured as shown in FIGS. That is, a hole 22 is formed at the lower end of the side plate portion of the upper frame 20, and a pin 16 (shaft member) that protrudes horizontally corresponding to the hole 22 is fixed to the bracket 13. Further, this connection structure includes a torsion spring 17 (biasing member) and a spring nut 18.
[0012]
With the torsion spring 17 attached to the pin 16, the pin 16 is inserted into the hole 22 of the upper frame 20, and the spring nut 18 is fitted into the pin 16 from the outside, so that the upper frame 20 can be rotated to the bracket 13. It is connected to. One end of the torsion spring 17 is engaged with the bracket 13 (main frame 10 side), and the other end is engaged with the flange portion 20a of the upper frame 20, and the upper frame 20 is moved forward by the torsion spring 17. It is urged to rotate.
[0013]
As shown in FIG. 1, two long holes 25 extending in the front-rear direction are formed in the upper plate portion of the upper frame 20. In the elongated hole 25, two pipe-shaped (bar-shaped) supports 30 extending downward from the headrest 3 are inserted. The lower end of the support 30 is fixed to the top 11b of the pipe 11 of the main frame 10 by welding or the like. Thereby, the headrest 3 is fixed so as not to move relative to the main frame 10 in the front-rear direction.
[0014]
In the above configuration, as shown by a solid line in FIG. 5, when the occupant A is not leaning against the backrest 2, the upper frame 20 is biased forward by the torsion spring 17 as shown in FIG. 1. The rear end of the long hole 25 is in a position where it hits the support 30 of the headrest 3, that is, in the front locking position. Even when the occupant A leans against the backrest 2, the upper frame 20 is at or near the front locking position.
[0015]
When the vehicle is collided, the waist part of the occupant A seated on the seat is pushed forward together with the vehicle, and the upper body relatively moves rearward. At that time, since the backrest 2 receives an impact load from the upper body of the occupant A, the upper frame 20 rotates rearward with respect to the main frame 10 against the torsion spring 17, thereby imaginary lines in FIG. 5. As shown, the upper portion of the backrest 2 is deformed rearward. At this time, the headrest 3 receives a load from the rear of the head of the occupant A, but since the headrest 3 is fixed to the main frame 10, the position thereof is maintained. As a result, as shown by an imaginary line in FIG. 5, by restraining the head with the headrest 3 in a state where the upper body of the occupant A is moved backward, the head is bent slightly forward with respect to the upper body and bent backward. Can be prevented and whiplash can be prevented.
[0016]
During the rear-end collision, the upper frame 20 that receives an impact load from the occupant rotates rearward. This rotation is a position where the front end of the long hole 25 is locked to the support 30 (rear locking position). It is limited by this, and an excessive forward bending state of the head can be avoided.
[0017]
The present invention is not limited to the above embodiment, and various forms can be adopted. For example, the urging member may be provided on both the left and right sides of the upper frame. The headrest only needs to be fixed in the front-rear direction with respect to the main frame, and the position of the headrest may be adjustable in the vertical direction.
[0018]
【The invention's effect】
As described above, according to the first aspect of the present invention, the upper frame is pivotally connected to the main frame and urged forward by the urging member, thereby preventing whiplash with a simple and inexpensive configuration. can do.
Further, according to the second aspect of the present invention, the rotation range of the upper frame can be limited between the front locking position and the rear locking position with a simple configuration in which a long hole is formed in the upper frame.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a structure for preventing lashing of a vehicle seat according to an embodiment of the present invention.
FIG. 2 is an enlarged perspective view showing a connecting structure on the left side of the main frame and the upper frame in the whiplash preventing structure.
FIG. 3 is an enlarged perspective view showing a connecting structure on the right side of the main frame and the upper frame in the whiplash preventing structure.
FIG. 4 is a front view of the right connecting structure.
FIG. 5 is a side view of a vehicle seat incorporating the above-described whiplash preventing structure.
[Explanation of symbols]
2 Backrest 3 Headrest 10 Main frame 17 Torsion spring (biasing member)
20 Upper frame 25 Slot 30 Support

Claims (4)

In a vehicle seat including a backrest and a headrest supported by the backrest,
The backrest includes a main frame, an upper frame attached to the upper portion of the main frame so as to be pivotable in the front-rear direction, and a biasing member that biases the upper frame toward the front locking position. ,
A support extending downward from the headrest is fixed to the upper part of the main frame so as not to be relatively movable in the front-rear direction .
The upper frame has an inverted U shape, and the lower ends of its left and right parts are rotatably attached to the upper part of the main frame,
A structure for preventing a whiplash of a vehicle seat, wherein an upper part of the upper frame is disposed between an upper part of the main frame for fixing the support and the headrest . The headrest support has a rod-like shape, and the upper frame is formed with a long hole extending in the front-rear direction. The support is inserted into the long hole, and the upper frame is biased forward by a biasing member. In this state, the rear end of the long hole is locked to the support and is in the front locking position, and when the impact load from the passenger is received, the front end of the long hole is set to the rear locking position locked to the support. The structure for preventing a whiplash of a vehicle seat according to claim 1, wherein The biasing member comprises a torsion spring, and the torsion spring is wound around at least one of left and right shaft members that respectively connect lower ends of the left and right parts of the upper frame to the upper part of the main frame. The structure for preventing a whiplash of a vehicle seat according to claim 1 or 2. The upper part of the main frame has left and right shoulders and a central top part higher than the shoulder parts, and the lower ends of the left and right parts of the upper frame are rotatably attached to the left and right shoulder parts. The structure for preventing whiplash of a vehicle seat according to any one of claims 1 to 3, wherein the support is fixed to the vehicle.

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