JP3595694B2 - 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 (3) for such an automobile, as shown in International Patent Publication No. 98/09838, a seat back frame (9) and a seat back and front rotating at the upper end of the seat back frame (9) are provided. A support means (5) supported so as to be able to move up and down from the back (3), and a headrest supported at the upper end of the support means (5) via a stay (27) so as to be movable up and down. (4) a pressure receiving member (10) supported by the lower end of the support means (5) and capable of receiving the pressure on the back of the occupant; and the seat back frame (9) and the pressure receiving member (10), respectively. And an operating link (12) rotatably supported on the pressure receiving member (10), and a pad disposed on the front side of the pressure receiving member (10).
[0003]
Therefore, for example, when the own vehicle is collided, an impact load acts on the seat back (3) toward the front side, and a reaction load by the occupant acts toward the rear side. 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, when the pressure receiving member (10) moves rearward, the support means (5) rotates forward with the upper side (24) of the seat back frame (9) as a pivot point and moves upward. Then, the headrest (4) supported on the upper end approaches the head of the occupant.
[0004]
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.
[0005]
[Problems to be solved by the invention]
However, in such a conventional technique, the support means (5) protrudes from the seat back (3), which makes it easier for the rear occupant or the like to touch the eyes. In particular, the holder (23) constituting the supporting means (5) is usually made of an iron pipe. In such a case, if the rust is formed on the upper end which is easy to touch with the eyes, the appearance becomes poor and the improvement is made. Is required. Preventing the rusting of the holder (23) by applying a rust-preventive coating process causes a rise in cost.
[0006]
The present invention has been made by paying attention to such conventional technology, and by covering the upper end portion of the holding portion of the support means, it is possible to prevent rusting of a portion easily accessible to the eyes of a rear occupant and improve the appearance. The purpose of the present invention is to provide an automobile seat back capable of ensuring the following.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 is a seat back frame, a supporting means rotatably movable back and forth on the upper end of the seat back frame and movably up and down, and a headrest holder on the upper end of the supporting means. A headrest, which is supported via a support member, a pressure receiving member which is supported at the lower end of the support means and is movable under the pressure of the occupant's back, and a pad disposed on the front side of the pressure receiving member. It is composed at least. A cover member for covering the upper end of the supporting means is provided at the upper end of the supporting means.
[0008]
The invention according to claim 2 is the vehicle seat back according to claim 1, wherein the cover member is supported by a headrest holder supported by the support means.
[0009]
According to a third aspect of the present invention, there is provided the vehicle seat back according to the first or second aspect, wherein the cover member is supported by an upper end portion of the support means.
[0010]
According to a fourth aspect of the present invention, there is provided the automobile seat back according to any one of the first to third aspects, wherein the cover member is formed of a synthetic resin material. The claw portion is supported by engagement.
[0011]
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.
[0012]
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.
[0013]
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.
[0014]
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'.
[0015]
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.
[0016]
Coiled springs 18, 18 are disposed between the spring hooks 23, 23 'of the side frames 2b, 2b' and the operating links 6, 6 ', respectively, and the other end of the operating link 6 is provided. The side 6b, 6b 'is always biased toward the front side FR.
[0017]
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.
[0018]
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.
[0019]
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.
[0020]
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.
[0021]
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.
[0022]
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.
[0023]
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.
[0024]
Reference numeral 36 denotes a cover member, which is disposed on the upper end portions 8b, 8b of the holding portions 8, 8. More specifically, the holding portions 8 have claw portions 36a which are engaged with engagement recesses (not shown) formed in upper end portions 8b of the holding portions 8 and upper ends of the holding portions 8 and 8, respectively. Stopper ribs 36b, 36b are formed to determine the position so that the cover member 36 does not lower further by interfering with the portions 8b, 8b.
[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. When a tool such as a screwdriver is pushed into the opening 19, a not-shown engagement member engaged with the opening 19 of the headrest holders 14, 14 is formed. 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]
Reference numeral 24 denotes a rubber-shaped support member that is supported by the upper frame 2a at a position on the rear side RR of the holding portion 8 and prevents the upper end portion of the holding portion 8 from turning beyond the rear side RR beyond this position. A first stopper 25 and a reference numeral 25 are a frame for hooking a backboard (not shown), and a reference numeral 34 is disposed on one side of the holding unit 8 so that the upper end of the holding unit 8 rotates the front FR to a position above this position. This is a wire-shaped second stopper that prevents the air from going out.
[0028]
Next, the operation according to this embodiment will be described.
[0029]
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.
[0030]
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 rearward due to the load in the rear RR direction by the occupant 30, the pad or the like is the holding point 8 of the armature pipe 7 because the shoulder point of the occupant 30 is at least the shoulder point of the AF05% tile mannequin. Never dig into the. 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.
[0031]
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.
[0032]
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.
[0033]
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.
[0034]
Therefore, the holding portions 8 and 8 and the stays 13 and 13 move together around the holder bracket 12. As shown in FIG. 7, the headrest 3 supported by the stays 13, 13 moves in a direction in which the headrest 30b (thick two-dot chain line) of the occupant 30 abuts, that is, in the upper side UP and the front side FR. . 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. 7 is indicated by a reference numeral 3 indicated by a two-dot chain line. 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.
[0035]
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.
[0036]
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.
[0037]
Further, since the upper end 8b of the holding portion 8 is covered by the cover member 36, the upper end 8b of the holding portion 8 moves to the front side FR and the upper side UP by the load in the rear RR direction by the occupant 30. Thus, even if the upper end portion 8b of the holding portion 8 protrudes from the seat back 1, even if the protruding portion is rusted, it is covered by the cover member 36, so that the appearance does not deteriorate. In addition, since it is covered with the cover member 36, it is difficult for the holding portion 8 to rust.
[0038]
In addition, since the cover member 36 is supported by the holding unit 8, the cover member 36 moves with the movement of the holding unit 8, and the upper end 8b of the holding unit 8 is securely covered. become.
[0039]
The cover member 36 is formed of a synthetic resin material, and the claw portion 36a is engaged and supported by the holding portion 8, so that no special fixing means is required.
[0040]
Further, 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) engaged with the opening 19 of the headrest holders 14, 14 is pushed to open the opening. 19, and can be pulled out of the holding portions 8, 8. That is, the headrest holders 14 and 14 can be locked off.
[0041]
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.
[0042]
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.
[0043]
The cover member 36 is not limited to a hollow columnar member, and may be the cover member 37 shown in FIGS.
[0044]
That is, the cover member 37 includes a main body 37a formed in the shape of an oval plate and a hollow cylinder fitted to the outer periphery of each of the upper ends 8b, 8b of the holding portions 8, 8 formed on the main body 37a. , 37b, and three (as appropriate) claw portions 37c, and a recess 37d in which the head of the headrest holder 14 can be stored is formed. Reference numeral 37e is a reinforcing rib.
[0045]
Although the cover members 36 and 37 have been described as being supported by the holding portion 8, the present invention is not limited to this. The cover members 36 and 37 may be supported by the headrest holder 14 supported by the holding portion 8. good.
[0046]
In this case, since the cover members 36 and 37 are supported by the headrest holder 14 supported by the holding unit 8, the cover members 36 and 37 move with the movement of the holding unit 8. Thus, the upper end 8b of the holding portion 8 is surely covered.
[0047]
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.
[0048]
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.
[0049]
【The invention's effect】
According to the first aspect of the present invention, since the upper end of the support means is covered by the cover member, the upper end of the support means moves forward and upward due to the load on the rear side by the occupant. Thus, even if the protruding portion protrudes from the seat back, even if the protruding portion is rusted, it is covered with the cover member, so that the appearance does not deteriorate. Further, since the support means is covered with the cover member, it is difficult for the supporting means to rust.
[0050]
According to the second aspect of the present invention, since the cover member is supported by the headrest holder supported by the support means, the cover member moves with the movement of the support means. The upper end of the means will be reliably covered.
[0051]
According to the third aspect of the present invention, since the cover member is supported by the support means, the cover member moves with the movement of the support means, so that the upper end of the support means is securely positioned. Will be covered.
[0052]
According to the invention as set forth in claim 4, the cover member is formed of a synthetic resin material, and a claw portion is engaged and supported by the support means or the headrest holder, so that special fixing means is required. do not do.
[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 top view of the cover member of FIG. 1;
FIG. 5 is a side view of FIG. 4;
FIG. 6 is a sectional view taken along the line SA-SA of FIG. 5;
FIG. 7 is a sectional view showing an operation embodiment of FIG. 1;
FIG. 8 is a plan view of a cover member according to another embodiment.
FIG. 9 is a side view taken along the arrow B in FIG. 8;
FIG. 10 is a side view taken along the arrow C in FIG. 8;
[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 8b Upper end part 13 of holding part Headrest stay 14 Headrest holder 30 Occupant 30a Occupant's back 30b Occupant's head 36, 37 Cover member FR Front RR Rear UP Upper LWR Lower

Claims (4)

A seat back frame, a support means rotatably movable back and forth at the upper end of the seat back frame and movably supported up and down, and a headrest supported at the upper end of the support means via a headrest holder. An automobile seat back comprising at least a pressure receiving member supported by a lower end portion of the support means and movable by receiving pressure from the back of an occupant; and a pad disposed on a front side of the pressure receiving member. And
A seat back for an automobile, wherein a cover member for covering an upper end portion of the support means is provided at an upper end portion of the support means. The vehicle seat back according to claim 1,
An automobile seat back, wherein the cover member is supported by a headrest holder supported by the support means. An automobile seat back according to claim 1 or claim 2,
An automobile seat back, wherein the cover member is supported by an upper end of the support means. An automobile seat back according to any one of claims 1 to 3, wherein
The cover member is formed of a synthetic resin material, and a claw portion is engaged and supported by the support means or the headrest holder.

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