JP3605536B2 - Car seat - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle seat having a headrest.
[0002]
[Prior art]
BACKGROUND ART In order to prevent an occupant from whiplashing when a vehicle is hit by a rear collision, a headrest that receives the occupant's head from behind is provided above the seat back of the vehicle seat. However, when the headrest is fixedly provided, the seat back inclines backward and the occupant's body moves rearward or obliquely upward due to the acceleration of the entire seat due to the impact at the time of a rear-end collision and the occupant's inertia. The head of the driver was displaced above the headrest and a large load was applied to the neck, making it difficult to reliably prevent the occupant from whiplashing.
[0003]
In order to deal with such a problem, the present applicant disclosed in Japanese Utility Model Laid-Open Publication No. Hei 7-1842 that the headrest was moved forward by moving the occupant's upper body backward at the time of a rear collision so that the headrest could approach the occupant's head. A proposal was made to prevent whiplash failure by doing this.
[0004]
As shown in FIG. 5, an upper frame 34 provided with a support portion 34a for supporting the support pipe 33 of the headrest support frame 32 so as to be vertically slidable and rotatable back and forth is disposed above the seat back frame 31, A pressure receiving portion 35 is provided at a lower end portion of the support pipe 33, and one end is connected to the other end of a link 36 whose one end is pivotally supported on the seat back frame 31 so as to be vertically swingable, and the link 36 is directed downward. A tension spring 37 for oscillating bias is provided, and when a load acts rearward on the pressure receiving portion 35 as shown by an arrow, the lower end of the headrest support frame 32 rises along the movement locus of the other end of the link 36 and the support pipe The headrest 33 (shown in FIG. 3) is disposed at the upper end of the headrest support frame 32 by the guide 33 being guided by the support portion 34a. ) Is configured to move diagonally forward and upward, and the moving end of the headrest is regulated by engaging a stopper 38 fixed to the support pipe 33 with a lower end of the support portion 34a. I have.
[0005]
Further, in Japanese Patent Application No. 11-24200, as shown in FIG. 6, the middle part in the vertical direction of the headrest support frame 42 to which the headrest 43 is attached is located at a position below the upper end of the side part of the seat back frame 41 by an appropriate distance. A pressure receiving portion 45 is provided at the lower portion of the headrest support frame 42 so as to receive a load applied from the front of the seat back. The pressure receiving portion 45 is formed by the rearward movement of the occupant's upper body during a rear-end collision. The headrest 43 is largely moved forward with respect to the amount of movement of the headrest support frame 42, and a guide bracket 46 provided at a portion corresponding to a lower portion of the headrest support frame 42 of the seat back frame 41 is attached to a pivot shaft center of the headrest support frame 42. Is formed under the headrest support frame 42 by forming an arc-shaped guide groove 47 Of the headrest 43 to prevent excessive forward movement of the headrest 43, and urge the lower portion of the headrest support frame 42 forward by a tension spring 48 to provide a constant urging force. Discloses that the headrest support frame 42 is positioned at the initial position.
[0006]
[Problems to be solved by the invention]
However, in the configuration as shown in FIG. 5, the basic structure for supporting the headrest is complicated as compared with the configuration shown in FIG. Is required to be fixedly welded to the support pipe 33, the number of components and the number of assembling steps are increased, and the cost is increased. In addition, since the bearing portion 34a and the stopper 38 that have the stopper function are provided in separate members, There is a problem that it is difficult to increase their positional accuracy, and there is a possibility that the working position of the stopper function varies.
[0007]
Further, in the configuration as shown in FIG. 6, a guide bracket 46 is provided separately from the pivot bracket 44 for rotatably supporting the headrest support frame 42, and the stopper function is provided by the guide groove 47. However, since the number of constituent members increases and the relative positional relationship between the pivot bracket 44 and the guide bracket 46 must be precisely controlled, the number of assembling steps increases, the cost increases, and the weight increases. In addition, there is a problem that the relative position between the rotation center and the stopper is likely to vary, and that the working position of the stopper function may vary.
[0008]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and has a simple and inexpensive configuration that allows a headrest to move forward at the time of a rear collision, and accurately stops at a predetermined movement limit position to appropriately support a head. The purpose is to provide.
[0009]
[Means for Solving the Problems]
Automobile seat of the present invention, a headrest support frame which is formed by bending a substantially U-shape which is open downwardly pipe with mounting the headrest at the top, front and rear on both sides inside of the seat back frame at its opposite sides The headrest support frame is provided with a pressure receiving part that receives the load applied from the front of the seat back at the lower part of the headrest support frame, and stops further rotation of the headrest support frame when the headrest is rotated forward by a predetermined distance. to the vehicle seat provided with a stopper path, pivot the shaft mounting portion and the side of the headrest support frame shaft for rotatably supporting the headrest support frame is mounted is abutting the stopper are integrally molded The support bracket is fixed to each of both sides of the seat back frame.
[0010]
With such a configuration, when a large acceleration acts rearward due to a rear collision or the like, the occupant's chest moves rearward and hits the pressure receiving unit, and the headrest moves forward by moving the pressure receiving unit rearward. rotates, the head is properly supported by the headrest, since rotation of the headrest support frame in this state manually stops the stopper path, headrest excessively there is no possibility of strongly presses the head moves, Moreover, since is provided integrally formed on the same member (pivot bracket) the stopper path support portion of the headrest support frame (the shaft mounting portion), you not need a separate member, assembled together can reduce the number of components The number of man-hours can be reduced, the weight and cost can be reduced, and since they are provided on the same member, the working position accuracy of the stopper means can be easily increased, and the headless It can be a by precisely stopped without variation at a predetermined moving limit position to properly support the head.
[0011]
Further, it is possible to properly regulate rotation limit with the seat back frame for each machine type can be supported only by the headrest support frame mounting the pivot bracket in a predetermined position of the seat back frame even when different, the further stopper It can also be used as a positioning part for a jig when the pivot bracket is attached, and the assembling workability can be improved.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the automotive seat of the present invention will be described with reference to FIGS.
[0013]
In FIG. 1, reference numeral 1 denotes a seat back of an automobile seat, which is reclineably attached to a seat cushion (not shown). Reference numeral 2 denotes a seat back frame having a substantially inverted U-shape as a whole, which constitutes a frame structure surrounding the left and right sides and the upper side of the seat back 1. The seat back frame 2 includes side frame plates 3 on both sides made of a press-formed product of a plate material, and an upper pipe 4 obtained by bending a pipe material into a substantially U-shape that is opened downward. The lower end is integrally fixed to the upper end of the side frame plate 3.
[0014]
A pivot bracket 5 is disposed inside a position that is a suitable distance below the upper ends of both sides of the upper pipe 4, and is fixed to the upper pipe 4 by welding. As shown in FIGS. 1 to 4, the pivot bracket 5 has a front plate portion 6 whose outer edge is in contact with the front end of the upper pipe 4 and an inner plate that extends rearward from the inner edge thereof in an L-shape. A shaft hole 8 is formed in the vicinity of the lower end of the rear portion of the inner plate 7, and a stopper 9 is provided at an appropriate distance diagonally forward and upward of the shaft hole 8. It is integrally formed by cutting and raising. 9a is a triangular reinforcing bead protrudingly formed at the corner of the base of the stopper 9.
[0015]
Reference numeral 11 denotes a headrest support frame for supporting a headrest (not shown). The headrest support frame 11 is constituted by a pipe frame 12 which is formed by bending a pipe material into an approximately U-shape which is opened downward, and is hung down from a headrest on an upper side thereof. A flat portion 13 whose front surface is flat-pressed is formed at a portion corresponding to the pair of stays 10. The lower portion of a square tubular stay holding tube 14 is fixedly welded to the flat portion 13 so that the stay holding tube 14 can support the headrest so that the height can be adjusted.
[0016]
The pipe frame 12 is configured to have a size just fitted into the inside of the upper pipe 4 of the seat back frame 2, and is disposed such that an upper side thereof is located immediately below an upper side of the upper pipe 4, and a stay holding section is provided. The upper part of the cylinder 14 is configured to contact the front end of the upper side of the upper pipe 4. A cushion rubber 15 is attached to a portion of the upper side of the upper pipe 4 where the stay holding cylinder 14 contacts.
[0017]
A through hole 16 is formed in the pipe frame 12 so as to coincide with the shaft hole 8 of the pivot bracket 5 in the state of being disposed as described above. The support shaft 17 is inserted, and a locking ring 18 that engages with the inner plate portion 7 of the pivot bracket 5 is fitted to the tip of the support shaft 17. As a result, the headrest support frame 11 has a backward rotation limit at which the stay holding cylinder 14 comes into contact with the cushion rubber 15 and stops as shown by a solid line in FIG. 9 and is rotatably supported back and forth between a front rotation limit and a stop.
[0018]
Both lower ends of the pipe frame 12 are connected by a pressure receiving member 19, and the pressure receiving member 19 is configured to receive a load applied to the front surface of the seat back 1 by the inertia of the occupant's chest during a rear collision. In addition, if a tension spring 21 is interposed between the lower end portions on both sides of the pressure receiving member 19 and the rising flange 3a in front of the side frame plate 3 of the seat back frame 2, if a predetermined load or more does not act on the pressure receiving portion 20. The lower part of the headrest support frame 11 is configured not to rotate backward.
[0019]
Further, between the side frame plates 3 on both lower sides of the seat back frame 2, S springs 22 for elastically supporting the waist of the occupant are disposed in two vertical stages. Locking portions 23 and 24 for locking both ends of the S spring 22 are formed on the side frame plate 3.
[0020]
The lower ends of the side frame plates 3, 3 are connected to each other by a connecting pipe 25, and the lower end thereof is connected to a nut member 28 for fastening and fixing to a reclining mechanism (not shown) and a reinforcing plate 27. A part 26 is provided.
[0021]
In the above configuration, in the normal state before the rear collision, the lower end of the headrest support frame 11 is urged forward by the tension spring 21, and the upper portion of the stay holding cylinder 14 is attached to the cushion rubber 15 attached to the upper pipe 4. The headrest is stationary with the head resting.
[0022]
Next, when the vehicle is rear-end impacted, the seat is impacted forward and the upper body of the occupant moves rearward due to the reaction, and a large load acts rearward on the front of the seat back 1. The pressure receiving portion 20 is strongly pressed rearward on the occupant's back, and the lower portion of the headrest support frame 11 rotates rearward around the support shaft 17 of the pivot bracket 5 against the urging force of the tension spring 21, The upper part of the headrest support frame 11 rotates forward, and the headrest moves forward. At that time, the headrest moves forward by enlarging by the ratio of the distance between the headrest and the support shaft 17 and the distance between the support shaft 17 and the pressure receiving portion 20 with respect to the backward movement amount of the pressure receiving portion 20. By arranging the pivot bracket 5 below, a large amount of forward movement of the headrest can be secured, the head of the occupant can be reliably received by the headrest, and the occupant's neck can be protected to prevent whiplash injury. Can be prevented.
[0023]
Further, the pipe frame 12 of the headrest support frame 11 engages with the stopper 9 provided on the pivot bracket 5 in a state where the upper portion of the headrest support frame 11 is rotated forward and the head is appropriately supported by the headrest. Then, the rotation of the headrest support frame 11 stops. In this manner, the headrest support frame 11 is stopped at the predetermined rotation position by the stopper 9 so that the headrest can be moved forward from the predetermined head support position even when a very high acceleration is applied due to a high-speed rear-end collision. It is possible to prevent the headrest from moving excessively forward and strongly pressing the head.
[0024]
Further, since the headrest support frame 11 is pivotally supported by the pivot bracket 5 disposed on the side of the seat back frame 2, the headrest support frame 11 has sufficient rigidity to withstand an impact, and receives pressure on the back of the occupant's back. Since only the unit 20 is located, the operation stability is high and desired performance can be secured.
[0025]
Further, since the stopper 9 is provided on the pivot bracket 5 for rotatably supporting the headrest support frame 11, a separate member is not required as the stopper means, so that the number of components can be reduced and the number of assembling steps can be reduced. The cost can be reduced, and the stopper 9 is provided on the same member, so that the working position accuracy of the stopper 9 can be easily increased, and the headrest can be stopped accurately at a predetermined movement limit position without variation and the head can be appropriately positioned. Can be supported.
[0026]
In addition, a pivot 17 for rotatably supporting the headrest support frame 11 is mounted, and the pivot bracket 5 provided with the stopper 9 is fixed to the seat back frame 2. Even when the seatback frame 2 is different, the headrest support frame 11 can be supported by simply attaching the pivot bracket 5 to a predetermined position of the seatback frame 2 and the rotation limit can be appropriately regulated.
[0027]
Further, when the pivot bracket 5 is attached to the seat back frame 2, the stopper 9 can be used as a positioning portion of the pivot bracket 5 with respect to the mounting jig, so that the assembling workability can be improved.
[0028]
【The invention's effect】
According to an automobile seat of the present invention, assembly man-hours it is possible reduce the number of configuration members also to be able to achieve reduction in weight and cost less, can easily raise the operative position accuracy or scan stopper means, The headrest can be stopped accurately at a predetermined movement limit position to appropriately support the head.
[Brief description of the drawings]
FIG. 1 is an overall front view of a frame configuration in an embodiment of an automobile seat according to the present invention.
FIG. 2 is a sectional view taken along the line AA of FIG. 1;
FIG. 3 is a sectional view taken along line BB of FIG. 1;
4A and 4B show a pivot bracket according to the embodiment, wherein FIG. 4A is a front view, FIG. 4B is a left side view of FIG. 4A, and FIG. 4C is a cross-sectional view of FIG. .
FIG. 5 is a perspective view of a conventional automobile seat.
FIG. 6 is a perspective view of another conventional automobile seat.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 seat back 2 seat back frame 5 pivot bracket 9 stopper 11 headrest support frame 17 support shaft 20 pressure receiving part

Claims (1)

The headrest support frame, which is formed by bending the pipe material downward in a substantially U-shape with the headrest attached to the upper part, is rotatably supported back and forth inside the both sides of the seat back frame on both sides , the pressure receiving portion for receiving a load applied from the front of the seat back in the lower portion of the headrest support frame is provided, automotive headrest is provided stopper path to stop further rotation of the headrest support frame in a state of being rotated at a predetermined distance forwardly A pivot bracket in which a spindle mounting portion on which a spindle for rotatably supporting the headrest support frame is mounted and a stopper with which a side portion of the headrest support frame abuts are integrally formed on the seat; An automotive seat characterized by being fixed to each of the parts .

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