JP2000071840A - Seat back for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a pressure receiving member from being loaded from backward and to prevent a supporting means from protruding backward when a head rest moves forward. SOLUTION: This seat back consists of a seat back frame 2, a supporting member 7 supported so as to move vertically to the upper end part of the seat back frame 2, a head rest 3 supported by the supporting means 7, a pressure receiving member 4 which is supported by the lower end part of the supporting means 7 and is capable of receiving the pressure of the back of an occupant, an operation link 6 formed by connecting the side part of the seat back frame 2 and the side part of the pressure receiving member 4 so as to rotate respectively, and a pad 32 disposed on the front side FR of the pressure receiving member 4. A protector 31 capable of withstanding the load from the back of the pressure receiving member 4 is disposed separately from the pressure receiving member 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat back, and more particularly to a vehicle seat back structure for protecting a cervical vertebra of an occupant when the vehicle is collided.

[0002]

2. Description of the Related Art As a conventional seat back of such an automobile, as shown in International Patent Publication No. 98/09838,
A seat back frame (9), support means (5) rotatably supported on the upper end of the seat back frame (9), and stays (27) on the upper end of the support means (5). And 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; It comprises at least 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). .

[0003] For this reason, for example, when the own vehicle is collided, an impact load acts on the seat back (3) toward the front side, and a recoil 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, the pressure receiving member (10) moves rearward, so that the support means (5) rotates about the upper side (24) of the seat back frame (9) as a rotation fulcrum, and is supported on the upper end thereof. The moved headrest (4) operates in a direction approaching the occupant's head.

[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 approaches the occupant's head. Is reliably received by the headrest (4) to protect the occupant's neck.

[0005]

However, in such a conventional technique, the headrest (4) is kicked by an occupant sitting behind the pressure receiving member (10) or the headrest (4) moves forward. Sometimes its supporting means (5)
May protrude rearward, and there is a demand for improved rear seating comfort.

The present invention has been made by paying attention to such a conventional technique, and it is intended to prevent a load from being applied to the pressure receiving member from the rear side and to support the pressure receiving member when the headrest is moved to the front side. Provide a vehicle seat back that does not protrude rearward.

[0007]

According to a first aspect of the present invention, there is provided a seat back frame, a supporting means rotatably supported on an upper end portion of the seat back frame so as to be able to rotate back and forth, and A headrest supported by an upper end portion, 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, and each of the seat back frame side portion and the pressure receiving member side portion are rotatable. And a pad disposed on the front side of the pressure receiving member. On the rear surface of the pressure receiving member, a protector capable of withstanding the pressure from the rear side of the pressure receiving member is disposed at a distance from the pressure receiving member.

According to a second aspect of the present invention, there is provided an automobile seat back according to the first aspect, wherein the protector includes:
It is held by the pressure receiving member.

According to a third aspect of the present invention, there is provided the automobile seat back according to the first or second aspect, wherein a longitudinal sectional shape of the protector is substantially formed along a shape of the pressure receiving member. The lower end is formed in a curved shape.

[0010]

Preferred embodiments of the present invention will be described below with reference to the accompanying 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.

1 to 10 show an embodiment of the present invention, wherein reference numeral 1 denotes an automobile seat back, and reference numeral 3 denotes an automobile seat back.
Is a headrest.

The seat back 1 is made of a seat back frame 2, a pad 32 (see FIG. 4) made of polyurethane foam or the like disposed before and after the seat back frame 2, and a cloth covering the pad 32. More at least with the epidermis. Reference numeral 34 shown in FIG.
Is an airbag device.

The seat back frame 2 is formed in an inverted U-shape, one of which is longer and the other is shorter (to secure an allowance for mounting the airbag device 34); A substantially symmetrical side frame 2b, 2b 'disposed at a position hanging down from the left and right ends of the frame 2a;
b, 2b 'and an underframe 2c provided between the lower end portions.

Each of the side frames 2b, 2b 'supports a bracket 5, 5' formed in a plate shape by an iron plate. Each of the brackets 5, 5 'has one end 6a, 6a' of an actuation link 6, 6 '.
But front and rear FR, RR by bolt 20 and bush 21
Each is supported so that it can rotate in the direction.
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.

Coiled springs 18 are arranged between the spring hooks 23, 23 'of the side frames 2b, 2b' and the operating links 6, 6 ', respectively. The other end portions 6b and 6b 'are always urged toward the front side FR.

The pressure receiving member 4 is formed by a rigid body such as an iron plate and extends in the right and left direction and is formed in a rectangular shape. As shown in FIG. 4, the cross section thereof has a flat central portion 4a and a sloped front FR. The first side portions 4c and 4c 'are disposed on the front side FR from the center portion 4a via the first step portions 4b and 4b' formed on the first side portions 4c and 4c '. Flange-shaped second part formed by projecting from front to front FR
It is formed in a substantially U-shape with the side parts 4e, 4e ',
The pad 32 is separated from the rear surface.

That is, the shape of the cross section of the pressure receiving member 4 is the same as the rearmost position (reference numeral 30c shown in FIG. 4) moved by the pressure of the back 30a of the occupant 30 at the side of the seat back frame 2. A certain side frame 2b, 2
It is formed in a shape that does not interfere with b ′.

The shape of the upper side of the vertical section located between the central portion 4a of the pressure receiving member 4 and, in particular, the holding portions 8 of the armature pipe 7 as supporting means described later is shown in FIG.
As shown in FIG. 3 to FIG. 3, a slope portion 9 rising rearward is formed.

On the rear side of the pressure receiving member 4, a protector 31 made of a synthetic resin and formed to cover the entire rear surface of the pressure receiving member 4 is disposed. The clip 31a of the protector 31 is connected to the pressure receiving member 4. 4 and is supported by engagement with an opening 4g formed in the same.

The protector 31 is formed so that the pressure receiving member 4 can withstand a load from the rear side RR, for example, a rear seat occupant can withstand a load such as kicking the front seat, that is, the rear surface of the own seat. The pressure receiving member 4 is disposed on the pressure receiving member 4 itself at a position appropriately separated from the pressure receiving member 4. Also,
The longitudinal sectional shape of the protector 31 is such that the upper end 31b is flanged up toward the pressure receiving member 4, the outline 31c is formed in a shape along the pressure receiving member 4, and the lower end 31d is formed in a curved shape. .

Below the upper frame 2a, a second frame 28, which is provided between the shoulders 2aa and 2aa 'of the upper frame 2a, is supported by welding.
A 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 the support portions 12b, 12b, which project toward the front side at positions spaced apart from the center of the holder bracket 12 to the left and right and have a U-shaped cross section. Be placed. Since the armature holders 11, 11 are supported by the upper ends of the holding portions 8, 8 of the armature pipe 7, the armature holders 11, 11 are supported by the support portions 12b, 12b of the holder bracket 12.
The holding portions 8, 8 of the armature pipe 7 are
Will be retained.

The armature pipe 7 has vertical holding parts 8, 8 which are arranged side by side in a front view, and is formed at the lower end of the holding parts 8, 8. The folded portion 10 is formed in a substantially U-shape with the folded portion 10 having a cross-sectional shape that is crushed and supported by gas welding.

The holding portions 8, 8 are arranged at least on the center side of the shoulder point of the AF 05% tile mannequin (SAE) when viewed from the front. 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 a rear-end collision of the vehicle, the shoulder of the occupant 30 does not interfere.

Further, the holding portions 8, 8 are formed in a front and rear "U" shape so that the pressure receiving member 4 is disposed in front of the holding members 8, 8 in a side view shown in FIG. Be done.
The bent portion 8a is formed at a position that 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.

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 vertically slidable. . Headrest holders 14, 14 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 the headrest holders 14, 14
Reference numeral 15 denotes a frame of the headrest 3.

Reference numeral 16 denotes the side frames 2b, 2b.
An S-shaped spring supported on b ′ via hooks 17 and 17 ′, and arranged at a position below the pressure receiving member 4.

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, the opening 19 is engaged with the opening 19 of the headrest holder 14. This is a structure in which an engaging portion (not shown) is pushed and detached from the opening portion 19 and can be removed from the holding portions 8. That is, the headrest holders 14, 1
4 can be locked off.

Reference numeral 24 denotes a stopper rubber, and reference numeral 25 denotes a backboard hook frame.

Next, the operation according to this embodiment will be described.

As shown in FIG. 1, the occupant 30
Seat cushion 27, and the seat back 1
In a normal state in which the back 30a is leaned on the headrest 3, there is a slight gap A between the head 30 b of the occupant 30 and the headrest 3.
There is a slight gap B between the back 30a of the occupant 30 and the pressure receiving member 4. However, the back 30 of the occupant 30
Although a pad 32 and a skin (not shown) are interposed between a and the pressure receiving member 4, the load from the occupant 30 is not applied to the pressure receiving member 4.

In this state, the pressure receiving member 4 is formed of a rigid body such as an iron plate, and has a substantially U-shaped cross section and is separated from the rear surface of the pad 32. The presence of the pressure receiving member 4 is not given via the pad 32 until a load is generated in the rear RR direction by the pressure sensor 30. That is, the occupant 30 is not given a foreign-body sensation.

On the rear surface of the pressure receiving member 4, the pressure receiving member 4
A protector 31 that can withstand the load from the rear side RR,
Since the pressure receiving member 4 is spaced apart from the pressure receiving member 4, the load from the rear RR to the front FR by the rear occupant is reduced.
Even if the pressure receiving member 4 is located in any position, the load such as kicking from the rear seat is not transmitted to the pressure receiving member 4 and the pressure receiving member 4 cannot be moved to the front side FR. That is, the safety of the occupant 30 is further ensured.

Since the holding portion 8 is formed in the shape of a "ku" on the front side with respect to the pressure receiving member 4, and the rear surface of the folded portion 10 is covered by the protector 31, the headrest 3 to the front side FR, that is, when the pressure receiving member 4 moves to the rear side RR as shown in FIG.
0 does not protrude to the rear RR. That is, the safety of the rear seat occupant is further ensured.

Since the protector 31 is held by the pressure receiving member 4, the distance between the protector 31 and the pressure receiving member 4 is fixed, and tuning to the load from the rear side RR is easy. That is, the distance between the two can be increased or decreased depending on the load value.

The protector 31 has a longitudinal sectional shape that is substantially the same as the pressure receiving member 4 and a lower end portion 31d that is formed in a curved shape, so that the armature pipe 7 supporting the headrest 3 is formed. Holding part 8,
8 protrudes to the rear side RR, the lower end 31d
Is formed in a curved shape, so that the safety of the rear occupant is further maintained.

When the own vehicle is collided and the seated occupant 30 is pushed by the rear side RR due to the secondary collision and the pad 32 or the like of the seat back 1 moves to the rear side RR, the pad 32 is moved by the back 30a of the occupant 30. The pressure receiving member 4 is pushed to the rear side RR via the like. Even if the pad 32 or the like moves rearward due to the load in the rear RR direction by the occupant 30, the load in the rear RR direction due to the back 30a of the occupant 30 is reduced because the pressure receiving member 4 receiving the load is rigid. It is transmitted to the headrest 3 reliably. That is, the movement of the headrest 3
As soon as a load is applied to the pressure receiving member 4, the pressure receiving member 4 is moved, so that there is no timing loss. In addition, the amount of movement of the pressure receiving member 4 increases.

In response to the movement of the holding portion 8 of the armature pipe 7 which is rotated to move to the upper side by rotating with respect to the load on the rear side RR, the load point of the pad 32 disposed at the opposite position is determined. The pad 32 and the like do not bite into the holding portion 8 of the armature pipe 7 because it is at least the shoulder point of the AF05% tile mannequin. 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.

An operating 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. , Around the bolt 20 in the upper UP and rear RR directions.

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. With the movement, the upper end portion of the armature pipe 7, that is, the upper end portions 8b, 8b of the holding portions 8, 8
At the same time, the headrest holders 14, 14 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.

Therefore, the holding portions 8, 8, stays 13, 13
Move together around the holder bracket 12.
The headrest 3 supported by the stays 13, 13 comes into contact with the head 30b of the occupant 30, as shown in FIG. In FIG. 5, the headrest 3 is illustrated as biting into the head 30 b of the occupant 30.
As is well known, b also has a substantially cylindrical shape in cross section, and thus does not bite.

Thus, the upper body of the occupant 30 is positioned on the rear side RR.
By moving the headrest 3, the head 30b of the occupant 30 that behaves as if it is left can be reliably held by the movement of the headrest 3. At this time, since the slope 9 rising to the rear side RR is formed on the upper side of the pressure receiving member 4,
The inclined surface 9 of the pressure receiving member 4 can move smoothly along the rear surface of the pad 32. In other words, it is difficult for the pressure receiving member 4 to bite into the pad 32.

In this state, the cross section of the pressure receiving member 4 is
At the rearmost position moved by the pressure of the back 30a of the occupant 30, as shown in FIG.
Does not interfere with the side frames 2b and 2b ', which are the side portions of.

The opening 19 on the rear side of the holding portion 8 is provided.
When a tool such as a screwdriver is pushed into the headrest holder 14, the engaging portion (not shown) engaged with the opening 19 of the headrest holder 14 is pushed out, detached from the opening 19, and pulled out of the holding portions 8, 8. Becomes possible. That is, the headrest holders 14 and 14 can be locked off.

The headrest holders 14, 1
4, the stays 13, 13 of the headrest 3 are vertically movably supported, so that the headrest 3 can be appropriately adjusted to the position of the head 30b of the occupant 30.

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 back of the occupant 30 is supported. Rear R by 30a
When no pressing force is applied to the R, the spring 18
Accordingly, the pressure receiving member 4 is on the front side FR. That is, the holding portion 8 of the armature pipe 7 supporting the pressure receiving member 4 at the lower end,
Since the headrest 3 supported on the upper end of the head 8 is located at the rear side RR according to the seesaw principle, the comfort of the occupant 30 is not impaired.

The armature pipe 7 has a holding portion 8,
The present invention is not limited to the embodiment in which the U-shape is formed by the folded portion 8 and the folded portion 10. For example, the lower end portions of the holding portions 8, 8 are supported by welding to the pressure receiving member 4 as they are without the folded portion 10. There may be.

In the above description, the head 30b of the occupant 30
Although it is assumed that the headrest 3 is securely held by the movement of the headrest 3, the movement of the headrest 3 and the movement of the seatback 1 are relative, and the seatback 1 is moved backward by the back 30a of the occupant 30. Even if it moves to RR, the headrest 3 does not move with respect to the head 30b of the occupant 30,
This also includes a description that the head 30b of the occupant 30 is protected by being held at that position.

[0048]

According to the first aspect of the present invention, a protector capable of withstanding the load from the rear side of the pressure receiving member is provided on the rear surface of the pressure receiving member at a distance from the pressure receiving member. Therefore, even if a rear occupant generates a load from the rear side, the pressure receiving member cannot be moved to the front side. That is, the safety of the occupant in the seat is further ensured.

Further, even if the headrest is moved to the front, that is, if the pressure receiving member is moved to the rear, the support means of the headrest is prevented from protruding to the rear. That is, the safety of the rear seat occupant is further ensured.

According to the second aspect of the present invention, since the protector is held by the pressure receiving member, the distance between the protector and the pressure receiving member is fixed, and tuning to a load from the rear side can be performed. Easy. That is, the distance between the two can be increased or decreased depending on the load value.

According to the third aspect of the present invention, the protector has a longitudinal cross-section that is substantially formed along the pressure-receiving member, and a lower end portion thereof is formed in a curved shape. Even if the lower end of the support means protrudes rearward, the safety of the rear occupant is further maintained by the curved shape.

[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 taken along the line SA-SA of FIG. 1;

FIG. 5 is an enlarged explanatory view showing an attached state of the protector of FIG. 1;

FIG. 6 is a front view of the pressure receiving member and the protector according to an arrow B in FIG. 4;

FIG. 7 is a sectional view taken along the line SC-SC in FIG. 6;

FIG. 8 is a sectional view taken along the line SD-SD in FIG. 6;

FIG. 9 is a sectional view taken along the line SE-SE of FIG. 6;

FIG. 10 is a sectional view showing the operation embodiment of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat back 2 Seat back frame 2a Upper frame of seat back frame 2b Side frame of seat back frame 3 Headrest 4 Pressure receiving member 6 Working link 6a One end of working link 6b Other end of working link 7 Armature pipe as supporting means 8 Armature pipe holding part 10 Armature pipe turn-back part 13 Headrest stay 29 Backboard trim bracket 30 Occupant 30a Occupant's back 30b Occupant's head 31 Protector FR Front side RR Rear side UP Upper side LWR Lower side

Claims (3)

[Claims] 1. A seat back frame, supporting means supported at an upper end of the seat back frame so as to be rotatable back and forth, a headrest supported at an upper end of the supporting means, and the supporting means A pressure-receiving member supported by the lower end of the occupant and capable of receiving pressure on the occupant's back;
An automobile seat back comprising at least an operating link formed by rotatably connecting the seat back frame side and the pressure receiving member side, and a pad disposed on the front side of the pressure receiving member. A seat back for an automobile, wherein a protector capable of withstanding a load from the rear side of the pressure receiving member is provided on a rear surface of the pressure receiving member at a distance from the pressure receiving member. 2. The vehicle seat back according to claim 1, wherein the protector is held by the pressure receiving member. 3. The vehicle seat back according to claim 1, wherein a longitudinal sectional shape of the protector is substantially formed along a shape of the pressure receiving member, and a lower end portion of the protector has a curved surface. An automobile seat back characterized by being formed in a shape.