JP2004148942A - Seat back for vehicle with whiplash preventing function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a structure of a seat back with a whiplash preventing function. <P>SOLUTION: A seat back frame 10 is substantially quadrangular and has right and left side plates 11, a lower pipe 12 suspended between the lower ends of the side plates 11, and a turning support pipe 13 suspended and fixed between the upper ends of the side plates 11. An oscillating frame 20 is substantially quadrangular, and has an oscillating pipe 21 having a reversed U-shape and a reinforcing pipe 22 suspended and fixed between the lower ends of right and left side sections 21b of the oscillating pipe 21. By penetrating the turning support pipe 13 through the right and left side sections 21b of the oscillating pipe 21, the oscillating frame 20 is supported turnably by the seat back frame 10. A support cylinder 23 for passing and supporting a stay 2 of a head rest is fixed to the upper side section 21a of the oscillating pipe 21 positioned over the turning support pipe 13 in a standing state. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a seat back having a whiplash preventing function.
[0002]
[Prior art]
When the vehicle is collided, the occupant is strongly pushed forward by the back or hips by the seat back, and the head moves relatively rearward, so that the neck is damaged, resulting in so-called whiplash. In order to prevent the whiplash, for example, a seat back described in Japanese Patent Application Laid-Open No. 2000-219069 has a seat back frame and a swing frame rotatably supported by the seed back frame.
[0003]
The seat back frame has left and right side plates and an upper pipe. The upper pipe has an inverted U-shape having a horizontal upper side portion and left and right side portions, and lower ends of these side portions are fixed to upper ends of the left and right side plates, respectively. The swing frame has a horizontal upper side and right and left sides and an inverted U-shaped swing pipe, and is fixed by being bridged between lower ends of the left and right sides of the swing pipe. A horizontal straight pipe-shaped reinforcing pipe.
[0004]
Rotation support mechanisms are respectively installed on the left and right sides of the upper pipe of the seat back frame. This rotation support mechanism has a rotation support shaft horizontally supported on a side portion of the upper pipe via a bracket, and the pair of rotation support shafts penetrate the left and right side portions of the swing pipe. Thus, the swing frame is rotatably supported by the seat back frame.
[0005]
In the above configuration, when the vehicle is hit, the occupant is pushed forward by the seat back. In other words, the occupant moves rearward relative to the seat back and dive into the seat back. Then, the load receiving portion of the swing frame receives the load of the occupant and is displaced rearward, whereby the swing unit is rotated to displace the headrest forward. As a result, the headrest can receive the head of the occupant, which prevents the head from moving significantly backward.
[0006]
[Patent Document 1]
JP 2000-219069 A (FIG. 1)
[0007]
[Problems to be solved by the invention]
However, the seatback having the above-described configuration requires a pair of independent rotation support mechanisms in addition to the seatback frame and the swing frame, so that the structure is complicated.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a vehicle seatback with a whiplash prevention function including a seatback frame and a swing frame rotatably supported by the seatback frame, wherein the seatback frame is , Left and right side plates, and a horizontal rotation support shaft spanned between the upper ends of the side plates. The swing frame has an upper side and left and right side sides. A support tube for inserting and supporting the stay of the headrest is fixed in an upright state, and the swing frame is configured so that the rotation support shaft passes through the left and right side portions thereof so that the rotation support shaft is centered. It is rotatably supported by the seat back frame, and the upper side of the swing frame is parallel to the rotation support shaft and located above the rotation support shaft.
[0009]
According to the above configuration, the swing frame is rotatably supported by the seat back frame by penetrating the left and right sides of the swing frame through the rotation support shaft of the seat back frame. No mechanism is required, and the configuration can be simplified.
[0010]
Preferably, the rotation support shaft is a horizontal straight pipe-shaped rotation support pipe, and both left and right ends thereof are fixed to the upper end of a side plate of the seat back frame. An inverted U-shaped oscillating pipe that provides a side portion is included, and the oscillating pipe is thicker than the rotation support pipe.
According to this configuration, the seat back frame and the swing frame can be made lightweight and simple. Since the swing pipe is thicker than the rotation support pipe, the rotation support pipe can be penetrated.
[0011]
Preferably, the seat back frame has a lower pipe spanned and fixed between the lower ends of the side plates and has a substantially square front shape, and the swing frame spans between the lower ends of the swing pipes. It has a straight horizontal reinforcing pipe fixed and fixed, and has a substantially square front shape.
According to this configuration, the strength of the seat back frame and the swing frame can be secured.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a seat back with a whiplash preventing function according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the vehicle seat back 1 is mounted on a seat cushion so as to be reclineable via an adjustment mechanism (neither is shown). A headrest (only a headrest stay 2 is shown in the figure) is mounted on an upper portion of the seatback 1.
[0013]
The skeleton of the seat back 1 includes a seat back frame 10 and a swing frame 20. The seat back frame 10 includes a pair of left and right side plates 11, a lower pipe 12 horizontally hung between lower ends of the side plates 11, and a rotation support pipe 13 (hook) horizontally hung between upper ends of the side plates 11. (A dynamic support shaft), and has a substantially square shape when viewed from the front. Both ends of the lower pipe 12 are bent upward, and are fixed to the rear side of the lower end of the side plate 11 by welding. An S spring 14 is hung between the lower ends of the side plates 11 via a support 14a. The S spring 14 is arranged in front of the lower pipe 12.
[0014]
The rotation support pipe 13 has a straight pipe shape, and both ends thereof are fixed to the upper end of the side plate 11 by welding. As shown in FIGS. 2 and 3, the upper end of the side plate 11 has an arc-shaped cross section, and a semicircular notch 11a is formed at the upper edge thereof. Both ends of the rotation support pipe 13 are welded in a state fitted in the notch 11a. A reinforcing bracket 15 having a U-shaped cross section is fixed to the inside of the upper end of the side plate 11 by welding so as to embrace each other, and the rotation support pipe 13 penetrates the reinforcing bracket 15. The reinforcing bracket 15 has a vertical flat plate portion 15a.
[0015]
The oscillating frame 20 has an inverted U-shaped oscillating pipe 21 and a straight pipe-shaped reinforcing pipe 22 horizontally hung between the lower ends of the oscillating pipe 21, and is substantially viewed from the front. It has a square shape. The oscillating pipe 21 includes an upper side 21a extending horizontally and linearly, and left and right side parts 21b extending linearly at right angles from both ends of the upper side 21a.
[0016]
A pair of support cylinders 23 is fixed to the upper side 21a of the swing pipe 21 by welding in an upright state, and the stay 2 of the headrest is detachably inserted into and supported by the support cylinder 23. The lower portions of the left and right side portions 21b of the oscillating pipe 21 are crushed flat for a predetermined length, and both ends of the reinforcing pipe 22 are fixed to the lower end by welding. Further, between the left and right side portions 21b of the oscillating pipe 21, two S springs 24 and 25 are vertically separated from each other and are hung via supports 24a and 25a. Since the supports 24a and 25a protrude forward, the S springs 24 and 25 are arranged in front of the swing pipe 21. The reinforcing pipe 22 and the S springs 24 and 25 are provided as load receiving portions that perform an operation described below.
[0017]
Through holes 21x are formed at the same height in the left and right side portions 21b of the swing pipe 21, and the rotation support pipe 13 of the seat back frame 10 passes through these through holes 21x, Thus, the swing frame 20 is rotatably supported by the seat back frame 10. A receiving plate 16 is fixed to the flat plate portion 15a of the reinforcing bracket 15 fixed to the upper end of the side plate 11, and the side portion 21b of the oscillating pipe 21 comes into contact with the receiving plate 16. It has become.
[0018]
The upper side portion 21a of the swinging pipe 21 and the headrest 2 are located above the rotation supporting pipe 13 which is the center of rotation of the swinging frame 20, and the S springs 24, 25 and the reinforcing pipe 22 as load receiving portions are rotated. It is located below the dynamic support pipe 13.
[0019]
Between the side plate 11 of the seat back frame 10 and the left and right side portions 21b of the swinging pipe 21, a pair of tension coil springs 30 (biasing means) are hooked below the rotating support pipe 13. The swing frame 20 is rotationally urged by the coil spring 30 in a direction in which the lower side of the rotation center is directed forward, that is, in a direction in which the headrest 2 is directed rearward.
[0020]
The rotation range of the swing frame 20 is restricted by a pair of rotation restriction mechanisms 40 (rotation restriction means) located below the rotation center. More specifically, a guide bracket 41 is fixed to the side plate 11, and the guide bracket 41 is formed with an arc-shaped guide groove 41 a centered on the rotation center of the swing frame 20. On the other hand, a rear end of a flat, elongated arm 42 extending in the front-rear direction is fixed to the side 21 b of the swing pipe 21, and a stopper pin 43 is fixed to a front end of the arm 42. . The stopper pin 43 is inserted into the guide groove 41a. Normally, the swing frame 20 is urged by the coil spring 30, the stopper pin 43 is locked at the front end of the guide groove 41a, and further rotation of the swing frame 20 is restricted. I have. Thus, the swing frame 20 is maintained in a predetermined stable posture.
[0021]
The operation of the seat back having the above configuration will be described. When the vehicle is collided, the occupant's waist and back dives into the seat back 1 and pushes the lower part of the swing frame 20 backward. Specifically, the S springs 24 and 25 are pushed rearward, and when the penetration is further large, the reinforcing pipe 22 is pushed. As a result, the swing frame 20 rotates counterclockwise as shown by the imaginary line in FIG. 2, and as a result, the headrest is displaced forward. By catching the occupant's head with the headrest displaced forward, the head is prevented from largely moving backward, and the occupant is prevented from whiplash.
[0022]
In the above configuration, since the rotation support pipe 13 of the seat back frame 10 penetrates the left and right side portions 21b of the swing pipe 21, the swing frame 20 is rotatably supported. No mechanism is required, and the configuration can be simplified. Further, the upper side portion 21a of the swing pipe 21 becomes the uppermost portion of the skeleton of the seat back 1, and can play the role of the upper pipe of the conventional seat back frame, thereby simplifying the upper structure of the seat back frame 10. be able to.
The present invention is not limited to the above embodiment, and can adopt various forms.
[0023]
【The invention's effect】
As described above, according to the present invention, a whiplash preventing function can be obtained with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a front view of a seat back according to an embodiment of the present invention.
FIG. 2 is a side view of the seat back.
FIG. 3 is a cross-sectional view of a main part along a line III-III in FIG. 1;
FIG. 4 is a cross-sectional view of a main part along a line IV-IV in FIG. 2;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seat back 2 Headrest stay 10 Seat back frame 11 Side plate 12 Lower pipe 13 Rotation support pipe (rotation support shaft)
Reference Signs List 20 swing frame 21 swing pipe 21a upper side 21b side 22 reinforcing pipe 23 support tube

Claims (3)

In a vehicle seat back with a whiplash prevention function, comprising a seat back frame and a swing frame rotatably supported by the seat back frame,
The seat back frame has left and right side plates and a horizontal rotation support shaft spanned between upper ends of the side plates. The swing frame has an upper side and left and right sides. A support cylinder for inserting and supporting the stay of the headrest is fixed to the upper side in an upright state,
The oscillating frame is rotatably supported by the seat back frame about the oscillating support shaft by penetrating the oscillating support shaft through the left and right sides thereof, and the upper side of the oscillating frame is pivoted around the oscillating frame. A seat back for a vehicle with a whiplash prevention function, wherein the seat back is positioned parallel to and above the dynamic support shaft. The turning support shaft is formed of a horizontal straight pipe-shaped turning support pipe, the left and right ends of which are fixed to the upper end of a side plate of the seat back frame, and the swing frame includes the upper side and the left and right side. 2. The vehicle seat back with a whiplash prevention function according to claim 1, further comprising an inverted U-shaped swinging pipe that provides a swinging pipe having a larger diameter than the swinging support pipe. 3. The seat back frame has a lower pipe that is stretched and fixed between the lower ends of the side plates, and has a substantially square front shape. The swing frame is stretched and fixed between the lower ends of the swing pipes. 3. The vehicle seat back with a whiplash prevention function according to claim 2, further comprising a horizontal straight pipe-shaped reinforcing pipe formed in a horizontal direction and having a substantially square front shape.

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