JP3595692B2 - Car seat back - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle seat back, and more particularly to a vehicle seat back structure for protecting an occupant's cervical spine when the vehicle is hit by a rear-end collision.
[0002]
[Prior art]
As a conventional seat back of such an automobile, as disclosed in International Patent Publication No. 98/09838, a seat back frame (9) and a support (24) supported by the seat back frame (9) are rotatable back and forth. And a headrest (4) supported vertically on a top end of a holder (23) of the support means (5) via a stay (27). A pressure receiving member (10) supported by a frame (17) hanging down like an ankle shoulder from a lower end portion of a holder (23) of the support means (5) and capable of receiving pressure on an occupant's back; An operating link (12) rotatably supported by the back frame (9) and the pressure receiving member (10), respectively; and a pad disposed on the front side of the pressure receiving member (10). Ri formed by at least configuration.
[0003]
The holder (23) of the support means (5) buffers and determines its position when moving in the rearward direction by a damper (not shown) supported by a bracket separate from the seat back frame (9). Will be.
[0004]
Therefore, for example, when the own vehicle is collided, an impact load acts on the seat back (3) toward the front, and a reaction load by the occupant acts toward the rear. That is, the load acts on the back element (20) and the pressure receiving member (10) provided between the seat back frames (9). At this time, the pressure receiving member (10) moves rearward, so that the holder (23) of the support means (5) rotates about the support (24) of the seat back frame (9) as a rotation fulcrum. The headrest (4) supported at the upper end of (23) operates in a direction approaching the occupant's head.
[0005]
Therefore, even if the seat back (3) flexes rearward due to the recoil load of the occupant when the host vehicle collides, the headrest (4) instantaneously comes close to the occupant's head. Is reliably received by the headrest (4) to protect the occupant's neck. At this time, since the pressure receiving member (10) is pushed rearward and the shoulder of the frame (17) collides with the support (24), the rotation of the holder (23) is stopped. The shoulder has a stopper function.
[0006]
[Problems to be solved by the invention]
However, in such a conventional technique, since the lower end of the holder (23) and the shoulder of the frame (17) are supported by welding, the welded portion may interfere. Further, if the bracket (23) is repeatedly subjected to a backward load, the bracket may bend, and the stop position of the holder (23) may change. Further, since the bracket is separate from the seat back frame (9), there is a possibility that the cost will rise and the cost cannot be reduced.
[0007]
The present invention has been made by paying attention to such a conventional technology, and provides a vehicle seat back in which a stop position of a means having a stopper function of a headrest support means can be stably determined and cost reduction can be achieved. Is what you do.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a seat back frame, a support means supported on an upper end of the seat back frame so as to be rotatable back and forth, and a headrest supported on an upper end of the support means. A pressure receiving member supported by a lower end portion of the support means and capable of receiving a pressure on the back of an occupant; an operating link rotatably supported by the seat back frame and the pressure receiving member; and a pressure receiving member. And at least a pad arranged on the front side. A damper capable of holding a rear surface of the support means is provided in front of an upper end portion of the seat back frame. The support means is provided with stopper means for preventing movement of the support means when the support means moved rearward and upward by an operation link with the movement of the pressure receiving member hits a seatback frame.
[0009]
According to a second aspect of the present invention, there is provided the automobile seat back according to the first aspect, wherein a portion of the seat back frame where the damper is disposed is formed by forming a pipe-shaped frame into a front-rear flat shape. .
[0010]
According to a third aspect of the present invention, there is provided the automobile seat back according to the first or second aspect, wherein the seat back frame in a portion where the damper is disposed has a pipe-like frame formed in a front-rear flat shape. It is formed with flange portions at both upper and lower ends.
[0011]
The invention according to claim 4 is the automobile seat back according to any one of claims 1 to 3, wherein the damper is formed with high hardness.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Note that FR is described as a front side, RR is a rear side, UP is an upper side, and LWR is a lower side.
[0013]
1 to 7 show an embodiment of the present invention, in which reference numeral 1 denotes an automobile seat back, and reference numeral 3 denotes a headrest.
[0014]
The seat back 1 is at least formed of a seat back frame 2, a pad (not shown) formed of polyurethane foam or the like disposed before and after the seat back frame 2, and a skin made of cloth or the like covering the pad. You.
[0015]
The seat back frame 2 is formed in an inverted U-shape, and one is longer and the other is shorter (to secure an installation allowance for an airbag device (not shown)), and an upper frame 2a formed of the upper frame 2a. The side frames 2b, 2b 'have a substantially left-right symmetrical shape and are disposed at positions suspended from the left and right ends, and the underframe 2c is provided between the lower ends of the side frames 2b, 2b'.
[0016]
Each of the side frames 2b, 2b 'supports a bracket 5, 5' formed in a plate shape by an iron plate. One end portions 6a and 6a 'of the operating links 6 and 6' are supported by the brackets 5 and 5 'by bolts 20 and bushes 21 so as to be rotatable in the front and rear FR and RR directions, respectively. Between the other end portions 6b, 6b 'of the operation links 6, 6', ends 4a, 4a 'of the pressure receiving member 4 described later are rotatably supported by rivets 22 and bushes 21.
[0017]
Between the spring hooks 23, 23 'of the side frames 2b, 2b' and the respective operating links 6, 6 ', coiled springs 18, 18 as urging means are disposed. The other end 6b, 6b 'side of 6 is constantly biased toward the front side FR.
[0018]
The pressure receiving member 4 is formed in a rectangular shape by being extended right and left by a rigid body such as an iron plate, and has a rear side on an upper side located between holding portions 8 of the armature pipe 7 as supporting means described later. A rising slope 9 is formed.
[0019]
At the center of the pressure receiving member 4, a folded portion 10 of the armature pipe 7 is formed in a flat shape in the front and rear direction and supported by gas welding.
[0020]
Below the upper frame 2a, a second frame 28 spanned between the shoulders 2aa and 2aa 'of the upper frame 2a is supported by welding. The holder bracket 12 is disposed at the center of the second frame 28, and both ends 12a thereof are supported by welding. Armature holders 11, 11 made of synthetic resin are provided inside support portions 12b, 12b, which protrude forward at a position separated from the center of holder bracket 12 to the left and right and are formed in a U-shaped cross section. Be placed. Since the armature holders 11 are supported on the upper ends of the holding portions 8 of the armature pipe 7, the armatures are supported by the support portions 12b of the holder bracket 12 via the armature holders 11 and 11. The holding portions 8, 8 of the pipe 7 are held.
[0021]
The armature pipe 7 is formed in a substantially U-shape by vertical holding parts 8, 8 which are arranged side by side in a front view and a folded part 10 formed at the lower end of the holding parts 8, 8. It becomes.
[0022]
The holding parts 8, 8 are arranged at least on the center side from the shoulder point of the AF05% tile mannequin (SAE) in a front view. The arrangement of the AF 05% tile mannequin (SAE) on the center side of the shoulder point means that the holding parts 8, 8 are arranged inside the shoulder points of most of the occupants 30 of the adult physique. Therefore, even if the occupant 30 receives a load from the front side of the seat back frame 2 due to the rear-end collision of the vehicle, the shoulder of the occupant 30 does not interfere.
[0023]
In addition, the holding portions 8 are formed in a front and rear “U” shape so that the pressure receiving member 4 is disposed on the front side of the holding members 8 in the side view shown in FIG. . The bent portion 8a is formed at a position where the bent portion 8a does not interfere with the lower end of the stay 13 of the headrest 3, and has an inner surface having a radius of 20 mm.
[0024]
As described above, the stays 13, 13 of the headrest 3 are supported in the holding portions 8, 8 via the armature holders 11, 11 made of synthetic resin so as to be slidable up and down. Headrest holders 14, 14 made of synthetic resin capable of controlling the up and down positions of the stays 13, 13 are held at the upper end portions of the holding portions 8, 8. Reference numeral 14a (not shown) denotes an engaging portion of the headrest holders 14, 14, and reference numeral 15 denotes a frame of the headrest 3.
[0025]
Reference numeral 16 denotes an S-shaped spring supported by the side frames 2b and 2b 'via hooks 17 and 17', and is disposed below the pressure receiving member 4.
[0026]
An opening 19 is formed in the rear surface of the holding portion 8, and when a tool such as a screwdriver is pushed into the opening 19, a not-shown engagement with which the opening 19 of the headrest holders 14, 14 is engaged. This is a structure in which the joint portion is pushed and detached from the opening portion 19, and can be pulled out from the holding portions 8, 8. That is, the headrest holders 14 and 14 can be locked off.
[0027]
At the portion of the upper frame 2a located on the rear side RR of the holding portion 8, the pipe-shaped upper frame 2a is crushed back and forth to form a planar fixing portion 35, and a through hole 35a of the fixing portion 35 A rubber-like first stopper 24 as a damper is provided. The first stopper 24 includes a head 24a having a thickness of 6 mm, a locking portion 24b locked to the through hole 35a via the neck 24d, and a through hole 35a protruding from the locking portion 24b. And a grip portion 24c that is pulled so that the locking portion 24b can be easily engaged. The hardness of the first stopper 24 is high, for example, at the level of the spring hardness Hs80 of JIS A or C, so that the head 24a having a thickness of 6 mm is bent by about 1 mm by the holding portion 8. is there.
[0028]
The upper and lower ends of the fixing portion 35 of the upper frame 2a are formed with flange portions 35b, 35b, respectively, toward the rear side RR.
[0029]
The holding portion 8 is provided with a wire-shaped second stopper 34. When the holding portion 8 is rotated around the holder bracket 12 as described later, the second frame 28 or the holder bracket 12 is marked with a star in FIG. The further rotation of the holding portion 8 is prevented by the collision as shown by the arrow.
[0030]
Reference numeral 25 denotes a frame for hooking a backboard (not shown).
[0031]
Next, the operation according to this embodiment will be described.
[0032]
As shown in FIG. 1, in a normal state in which the occupant 30 is seated on the seat cushion 27 of the seat 26 and leans on the back 30 a against the seat back 1, the head 30 b of the occupant 30 and the headrest 3 have a slight gap. A, a small gap B is formed between the back 30a of the occupant 30 and the pressure receiving member 4. Although a pad and a skin (not shown) are interposed between the back 30 a of the occupant 30 and the pressure receiving member 4, the load from the occupant 30 is not applied to the pressure receiving member 4.
[0033]
In this state, when the own vehicle is collided and the seated occupant 30 is pushed by the rear RR due to the secondary collision and the pad or the like moves to the rear RR, pressure is received by the back 30a of the occupant 30 via the pad or the like. The member 4 is pushed to the rear side RR. Even if the pad or the like moves to the rear RR due to the load in the rear RR direction by the occupant 30, the pad or the like is the holding portion of the armature pipe 7 because the shoulder point of the occupant 30 is at least the shoulder point of the AF05% tile mannequin. I don't dig into 8. For this reason, the rise due to the rotation of the holding unit 8 is not hindered, and the operation amount of the headrest 3 can be sufficiently secured.
[0034]
Further, since the pressure receiving member 4 is formed of a rigid body such as an iron plate, the load in the rear RR direction by the occupant 30 is transmitted to the holding portion 8 without fail. That is, the headrest 3 moves immediately when a load is applied to the pressure receiving member 4, so that there is no timing loss. In addition, the amount of movement of the pressure receiving member 4 increases.
[0035]
The operation link 6 supporting the pressure receiving member 4 is rotationally urged about the bolt 20, and the other end 6b of the operation link 6 is moved from the position shown in FIG. 1 to the position shown in FIG. Then, the other end 6b of the operation link 6 is rotated about the bolt 20 in the direction of the upper side UP and the rear side RR.
[0036]
Thus, when the other end 6b of the operation link 6 rotates to the upper side UP and the rear side RR, the lower end of the armature pipe 7, that is, the folded portion 10 moves to the upper side UP and the rear side RR. Along with the movement, the headrest holders 14, 14 together with the upper end of the armature pipe 7, that is, the upper ends 8b, 8b of the holding portions 8, 8, move to the upper side UP and the front side FR. By this movement, the stay 13 of the headrest 3 is also moved to the upper side UP and the front side FR.
[0037]
Therefore, the holding portions 8 and 8 and the stays 13 and 13 move together around the holder bracket 12. The headrest 3 supported by the stays 13, 13 comes into contact with the head 30b (thick two-dot chain line) of the occupant 30, as shown in FIG. In FIG. 7, the headrest 3 is illustrated as biting into the head 30b of the occupant 30, but the center of the headrest 3 is depressed, and the head 30b of the occupant 30 also has a cross section as is well known. It is not a bite because it is almost cylindrical. In addition, the headrest 3 shown in FIG. 5 is indicated by reference numeral 3 indicated by a two-dot chain line, and the headrest 3 indicated by the two-dot chain line indicates the position of the headrest 3 when it does not move. The head 30b of 30 indicates that it moves as indicated by a thin two-dot chain line.
[0038]
In this manner, the head 30b of the occupant 30 that is left behaving as the upper body of the occupant 30 moves to the rear side RR is reliably held by the movement of the headrest 3. At this time, the inclined surface 9 rising to the rear side RR is formed on the upper side of the pressure receiving member 4, so that the inclined surface 9 of the pressure receiving member 4 can move smoothly along the rear surface of the pad. In other words, it is difficult for the pressure receiving member 4 to bite into the pad.
[0039]
In this state, since the holding portion 8 is formed in the shape of a "ku" in front and rear with respect to the pressure receiving member 4, when the pressure receiving member 4 moves to the rear side RR, as shown in FIG. The pressure receiving member 4 and the folded portion 10 do not protrude to the rear side RR.
[0040]
In addition, since the first stopper 24 capable of holding the rear surface of the holding portion 8 is provided on the front side FR of the upper frame 2a of the seat back frame 2, in a normal state, the holding portion 8 of the headrest 3 is not provided. The first stopper 24 stops at the normal position, and the stop position is determined stably. Since the first stopper 24 is supported by the upper frame 2a of the seat back frame 2, the cost can be reduced because components such as brackets are unnecessary.
[0041]
In addition, the holding portion 8, which has been moved to the rear RR and the upper side UP by the operation link 6 with the movement of the pressure receiving member 4, is attached to the second frame 28 or the holder bracket 12 supported by the seat back frame 2. Since the second stopper 34 is disposed as stopper means for preventing the movement of the holding portion 8 by hitting, the second frame 28 supported by the seat back frame 2 is attached to the second frame 28 supported by the seat back frame 2 at the time of the rear-end collision in which the pressure receiving member 4 moves. The stop position of the holding part 8 of the headrest 3 is stably determined by the collision of the two stoppers 34. Since the position of the second stopper 34 can be easily changed, tuning at the time of design development is easy, and there is a degree of freedom in setting.
[0042]
Since the rear side RR of the fixing portion 35 of the upper frame 2a supporting the first stopper 24 does not protrude, the shape when the outer skin is covered by the portion RR is good, and the rear occupant does not feel any oppression.
[0043]
The upper and lower ends of the fixing portion 35 of the upper frame 2a are formed with flange portions 35b, 35b toward the rear side RR, so that the strength of the seat back frame 2 is significantly improved.
[0044]
Since the stop position of the holding portion 8 in the normal state is stopped by the first stopper 24 formed with high hardness that is bent only by about 17%, the stop position in the normal state is stably maintained. Decided.
[0045]
When a tool such as a screwdriver is pushed into the opening 19 on the rear side of the holding portion 8, the engaging portion (not shown) with which the openings 19 of the headrest holders 14, 14 are engaged is pushed out from the opening 19. It can be detached and pulled out of the holding portions 8. That is, the headrest holders 14 and 14 can be locked off.
[0046]
Further, since the stays 13, 13 of the headrest 3 are vertically movably supported by the headrest holders 14, 14, the headrest 3 can be appropriately adjusted to the position of the head 30b of the occupant 30.
[0047]
Also, a spring 18 for urging the pressure receiving member 4 toward the front side FR is supported between the operation link 6 and the side frame 2b of the seat back frame 2, so that the occupant 30 can be moved backward by the back 30a. When no pressing force is applied to the side RR, the pressure receiving member 4 is in the front side FR by the spring 18. That is, the headrest 3 supported on the upper ends of the holding portions 8, 8 of the armature pipe 7 supporting the pressure receiving member 4 on the lower end is settled at the rear RR position according to the seesaw principle, thereby impairing the occupant's 30 livability. Nothing.
[0048]
The armature pipe 7 is not limited to the embodiment in which the holding portions 8, 8 and the folded portion 10 form a U-shape. For example, without the folded portion 10, the lower end portions of the holding portions 8, 8 receive pressure. It may be supported by the member 4 by welding.
[0049]
In the above description of the operation, it is assumed that the head 30b of the occupant 30 is securely held by the movement of the headrest 3, but the movement of the headrest 3 and the movement of the seat back 1 are relative to each other. Even if the seat back 1 is moved to the rear side RR by the back 30a of the occupant 30, the headrest 3 does not move with respect to the head 30b of the occupant 30, and is held at that position, so that the head 30b of the occupant 30 is moved. It also includes those described as protected.
[0050]
【The invention's effect】
According to the first aspect of the present invention, a damper capable of holding a rear surface of the support means is provided in front of an upper end portion of the seat back frame. The damper stops at the normal position, and the stop position is determined stably. Since such a damper is supported by the seat back frame itself, the cost can be reduced because parts such as brackets are unnecessary.
[0051]
Further, the support means is provided with a stopper means for preventing the support means from being moved by the support link, which has been moved rearward and upward by the operation link with the movement of the pressure receiving member, hits the seat back frame. Therefore, at the time of a rear-end collision in which the pressure receiving member moves, the stop position of the support means of the headrest is stably determined by the collision of the stopper means with the seat back frame. Since the position of the stopper means can be easily changed, tuning during design and development is easy, and there is a degree of freedom in setting.
[0052]
According to the second aspect of the present invention, since the rear side of the seat back frame does not protrude, the shape when the outer skin is covered by that amount is good, and the rear occupant does not feel pressure.
[0053]
According to the third aspect of the invention, the strength of the seat back frame is significantly improved by forming the flange portion.
[0054]
According to the invention as set forth in claim 4, since the stop position of the support means in the normal state is stopped by the damper formed with high hardness, the stop position in the normal state is stably maintained. Decided.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a seat back according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of FIG.
FIG. 3 is a perspective view showing a main part of FIG. 1;
FIG. 4 is a sectional view showing a relationship between a holding portion of the armature pipe of FIG. 1 and a first stopper.
FIG. 5 is a perspective view of FIG. 4;
FIG. 6 is a top view of FIG. 4;
FIG. 7 is a sectional view showing an operation embodiment of FIG. 1;
[Explanation of symbols]
Reference Signs List 1 seat back 2 seat back frame 2a upper frame 2b of seat back frame side frame 3 of seat back frame 3 headrest 4 pressure receiving member 6 operating link 6a one end 6b of operating link 7 other end of operating link 7 armature pipe 8 as support means Armature pipe holding part 14 Headrest holder 24 First stopper 30 as a damper 30 Crew member 30 a Crew member's back 30 b Crew member's head 34 Second stopper 35 as a stopper means Fixing part FR Front RR Rear UP Upper LWR Lower

Claims (4)

A seat back frame, supporting means rotatably supported at the upper end of the seat back frame so as to rotate back and forth, headrest supported at the upper end of the supporting means, and support at the lower end of the supporting means. A pressure-receiving member that is capable of receiving pressure on the back of the occupant, an operation link rotatably supported by the seat back frame and the pressure-receiving member, and a pad disposed on the front side of the pressure-receiving member. In an automobile seat back configured at least,
On the front side of the upper end of the seat back frame, a damper capable of holding a rear surface of the support means is provided,
The supporting means is provided with stopper means for preventing movement of the supporting means by causing the supporting means, which has been moved rearward and upward by an operation link with the movement of the pressure receiving member, to hit the seatback frame. Characteristic car seat back. The vehicle seat back according to claim 1,
A seat back frame at a portion where the damper is provided is formed by forming a pipe-shaped frame into a front-rear flat shape. The vehicle seat back according to claim 1,
A seat back frame at a portion where the damper is disposed is formed by forming a pipe-like frame into a front-rear flat shape and forming flange portions at both upper and lower ends. An automobile seat back according to any one of claims 1 to 3, wherein
An automobile seat back, wherein the damper is formed with high hardness.

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