JP2001058529A - Seat back for automobile use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable holding the head of a crewman surely by stay bolt which is supported by a linear part of the first headrest holder bracket and the second headrest holder bracket respectively and which moves up and down freely and headrest supported by the stay bolt. SOLUTION: If an impact load is added, a load is put on a crewman to move toward the rear side RR. At a pressure part 26, a return spring 12 for active headrest begins to extend and the first headrest holder bracket 25 that has the pressure part 26 begins to rotate, and a headrest support member 7 that supports the first headrest holder bracket 25 rotates forward FR assuming a shoulder bolt 5 and a bush 6 as the center. Through a stay bolt 13 that is supported by a linear part 14 of the headrest support member 7 and the second headrest holder bracket 22, rotation of a headrest 3 is controlled to forward FR, and a head of a crewman can be surely held, and the protection of cervix becomes possible.

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 a vehicle occupant when the vehicle is hit by another vehicle.

[0002]

2. Description of the Related Art A conventional seat back of an automobile is provided with a horizontal frame member having a rotating hinge at a front side of an upper end portion of a side frame, as shown in, for example, Japanese Patent Application Laid-Open No. Hei 10-119196, and is collided. Is provided with the pressure receiving part.

[0003] Therefore, for example, when the own vehicle is collided, an impact load (primary collision) is applied to the seat back toward the front side first, and then the reaction load (secondary collision) by the occupant is applied. Acts toward the back. That is, the load acts on the pressure receiving portion. At this time, the pressure receiving portion moves rearward, whereby the horizontal frame rotates forward around the front rotating hinge, and the headrest supported by the horizontal frame moves to a portion corresponding to the occupant's head. Thus, the headrest operates in a direction approaching the occupant's head.

Therefore, even if the seatback flexes rearward due to the reaction load of the vehicle occupant when the vehicle collides, the pressure load causes the pressure receiving portion to instantaneously make the headrest by the principle of leverage, thereby causing the head of the occupant to return. , The head of the occupant is securely received by the headrest, and the cervical vertebra of the occupant is protected.

[0005]

However, in such a conventional technique, since the rotating hinge is provided on the front side, when the seat back is pressed from the front side, the rotating hinge can be caught there as foreign matter. Will be.
In addition, since the horizontal frame member is inclined forward, it is likely to interfere with the occupant's shoulder, and the movement of the horizontal frame member may be stopped by the shoulder or the like.Therefore, the amount of forward movement of the headrest needs to be improved. ing.

The present invention has been made by paying attention to such a conventional technology, and the center of rotation when the headrest moves to the front side is not given to the occupant as a foreign object feeling but is pushed by the pressure receiving portion. It is an object of the present invention to provide a vehicle seat back which is capable of moving a headrest to the front side by a corresponding amount, and which is intended to be lightweight.

[0007]

According to a first aspect of the present invention, there is provided a seat back frame having at least side frames on both sides, and a headrest support rotatably mounted between upper ends of the side frames so as to be rotatable back and forth. Components,
A first headrest holder bracket which is supported at a position deviated to one of the right and left from the left and right center of the headrest support member and has a pressure receiving portion disposed at a position where it can receive an impact load due to a rear-end collision; and the headrest support member A second headrest holder bracket which is supported at a position deviated to the left or right from the left and right center and is vertically penetrated, and a linear portion of the first headrest holder bracket and the second headrest holder bracket. A stay movably supported by
And at least a headrest supported by the stay.

According to the first aspect of the present invention, since the headrest support member supporting the stay of the headrest rotates back and forth with respect to the side frame, the center of rotation is in the side frame, and the foreign body does not give a foreign object feeling. In addition, when the load due to the secondary collision of the occupant is applied to the pressure receiving part, it rotates around the upper end of the side frame, so it is in a position that does not easily interfere with the occupant's shoulder, and the headrest moves forward by that much It is possible to reliably hold the occupant's neck.

According to a second aspect of the present invention, there is provided the automobile seat back according to the first aspect, wherein the straight portion and the pressure receiving portion of the first headrest holder bracket form a substantially L shape in a front view. .

According to the second aspect of the present invention, since the pressure receiving portion corresponding to the occupant's back, which is a position where the impact load accompanying the rear-end collision can be received, is substantially L-shaped with respect to the linear portion in front view. In addition, it is inexpensive due to the elimination of a pressure receiving operation plate and the like, and the weight can be significantly reduced even when only one vertical portion is provided and a horizontal portion is added thereto.

According to a third aspect of the present invention, there is provided the vehicle seat back according to the first or second aspect, wherein an upper cross member is fixedly provided between upper ends of the side frames. Become.

According to the third aspect of the present invention, since the side frame and the upper cross member form a square, the strength of the seat back is remarkably improved, and the headrest support member for supporting the pressure receiving portion for receiving the secondary collision is provided. There is no trouble such as deformation.

According to a fourth aspect of the present invention, there is provided the vehicle seat back according to any one of the first to third aspects, wherein the pressure receiving portion of the first headrest holder bracket is constantly biased forward. In addition, there is provided an urging means which does not extend under a sitting load but can extend only under an impact load accompanying a rear-end collision.

According to the fourth aspect of the present invention, the first
The pressure receiving portion of the headrest holder bracket is always urged forward and does not extend under a sitting load, but interposes an urging means that can be extended only by the impact load accompanying a rear-end collision, so that the occupant can normally sit down. In the relaxed state, the urging means does not extend in response to the backrest load of the occupant's back, and the back can be held. Further, when a load due to a secondary collision due to a rear-end collision is applied, the pressure receiving portion can be extended, so that it does not hinder the movement of the pressure receiving portion, and can move reliably.

According to a fifth aspect of the present invention, there is provided the vehicle seat back according to any one of the first to fourth aspects, wherein the upper cross member is provided with the headrest support member when the headrest support member rotates forward. And a stopper surface for preventing rotation of the headrest support member.

According to the fifth aspect of the present invention, even if the headrest rotates to the front side due to the secondary collision and the occupant's neck can be protected, the stopper surface limits the rotation angle to the front side. Since it is possible, the occurrence of the problem of abnormally rotating to the front side is prevented.

[0017]

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.

FIGS. 1 to 4 show an embodiment of the present invention, wherein reference numeral 1 denotes an automobile seat back and reference numeral 3 denotes a headrest.

The seat back 1 has a seat back frame 4 having at least two iron-made side frames 2 and 2 on both sides, and a rear side RR of upper ends 2a and 2a of the side frames 2 and 2 of the seat back frame 4. An iron plate headrest support member 7 rotatably mounted in the front and rear FR and RR between the stepped bolt 5 and a bush 6 for absorbing rubbing noise and shock during rotation, and a left and right center of the headrest support member 7. A first hollow portion in which an upper end portion 14a of a straight portion 14 described later is supported by the welding GW at a position further deviated to the right and a pressure receiving portion 26 is disposed at a position where a secondary impact load accompanying a rear-end collision can be received. A headrest holder bracket 25 and a hollow second head supported by a welding GW at a position deviated leftward from the left-right center of the headrest support member 7. Formed by more configuration and dress preparative holder bracket 22.

The seat back frame 4 includes the side frames 2 and 2 and an upper end 2 of the side frame 2.
The upper cross member 10 erected substantially horizontally between the front FRs a and 2a and the lower cross member 11 erected substantially horizontally at the lower ends 2b and 2b of the side frames 2 are formed in a rectangular shape. Being done, side frame 2
The upper cross member 10 and the lower cross member 11 are mutually supported by welding. Between the side frames 2, a return spring 12 for the active headrest, which is a “biasing means” and does not bend during normal use, and a spring 35 for riding comfort that can be bent by the load during normal use , 35 are arranged, and are bridged between the clips 17, 17, 17. The active headrest return spring 12 and the ride comfort spring 35 are both S-shaped, but have significantly different spring constants as described above.

The first headrest holder bracket 2
As shown in FIG. 3, a part of the active headrest return spring 12 is directly engaged with the pressure receiving portion 26 of No. 5, so that the pressure receiving portion 26 is constantly urged to the front side FR. The active headrest return spring 12 has a "spring force" that does not expand under a sitting load of an occupant (not shown) but can expand only under a secondary impact load accompanying a rear-end collision.

As shown in FIG. 4, the headrest support member 7 is provided with the first headrest holder bracket 25.
An upper surface portion 7a extending horizontally from side to side and having upper and lower through holes 19 through which the first headrest holder bracket 25 is inserted, from the rear end of the upper surface portion 7a.
The rear surface portion 7b hanging down along the radius R is formed by being bent at a right angle. Between the surface of the front side FR of the rear surface portion 7b and the first headrest holder bracket 25,
GW supported. A second lower portion of the rear surface portion 7b is further suspended downward at a position separated from a first stopper surface 10a of the upper cross member 10 described later.
A stopper 7c is formed. At both left and right end portions of the rear surface portion 7b, there are provided intervening portions 7e, 7e formed by being bent toward the front side FR.

A first stopper 7d is formed at the front end of the upper surface 7a. The first stopper 7d and the second stopper 7c prevent the first headrest holder bracket 25 from being in contact with metal. Cushioning member 1
8 and 18 are respectively arranged.

As shown in FIG. 4, the upper cross member 10 has a U-shaped cross section having a front side FR closed and a rear side RR opened.
a is the first headrest holder bracket 25
Along the rear side RR. When the occupant applies a load leaning on the seat back 1, the first stopper surface 10a comes into pressure contact with the second stopper portion 7c of the headrest support member 7 via the cushioning member 18 to rotate the headrest support member 7. To prevent. When the headrest support member 7 rotates to the front side FR, the first stopper portion 7d of the headrest support member 7 abuts via the buffer member 18 to prevent rotation of the headrest support member 7 by means described later. The second stopper surface 10b is formed.

The first headrest holder bracket 2
5 comprises a linear portion 14 slightly upwardly facing the UP from the upper surface portion 7a and substantially suspended therefrom, and the pressure receiving portion 26 formed continuously on the linear portion 14 via a curved portion, It is substantially L-shaped when viewed from the front. A headrest holder 16 made of a synthetic resin is fitted in the middle of the straight portion 14, and a stay 13 of the headrest 3 is mounted in the headrest holder 16 so as to be vertically movable. The pressure receiving portion 26 has a vertical position near the back of an occupant (not shown).
By being squashed and formed in RR, it has a predetermined width up and down. The stay 13 of the headrest 3 is formed at a predetermined position so as to avoid a portion corresponding to a shoulder (not shown) of an occupant, and is formed to be inclined to the front side FR.

The first headrest holder bracket 2
5 and the second headrest holder bracket 22 are arranged side by side at right and left sides from the left and right center in a front view to form a vertical shape, and hold the linear portion 14 and the second headrest holder bracket 22. The position is
In front view, at least AF05% tile mannequin (SA
It is arranged on the center side from the shoulder point of E).
It is arranged on the center side from the shoulder point of the AF05% tile mannequin (SAE), which means that the straight portion 14 and the second headrest holder bracket 22 are located inside the shoulder point of most occupants of adult physique in the left-right direction. Since the vehicle is rearranged, the seat back frame 4
, The shoulder point of the occupant does not interfere with the linear portion 14 and the second headrest holder bracket 22 even if the occupant is pressed against the seat back 1 from the front FR.

The rear part of the lower end of the straight part 14 is
In a side view shown in FIG. 4, it is bent in the shape of a “ku” on the front side. As shown in FIG. 3, the bent portion 20 is formed at a position close to the lower end (not shown) of the stay 13 of the headrest 3 so as not to interfere with the lower end, and the inner surface of the bent portion 20 has a radius of 20 mm. .

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

When the occupant is seated on a seat cushion composed of the seat back 1 and a seat cushion (not shown), and the driver does not lean against the back of the seat back 1, the head of the occupant and the headrest 3 may not move. There is a gap between them, and a gap is also formed between the occupant's back and the pressure receiving portion 26. However, the back of the occupant and the pressure receiving portion 26
A pad, a skin member, and the like (not shown) are interposed between them. The occupant at the time of sitting, in a relaxed state,
When leaning on the seatback 1, the load applied from the back of the occupant allows the pad to bend and move to the rear side RR, so that the occupant's back can be received softly. Therefore, the seating feeling is good. Of course, no load is applied to the pressure receiving portion 26.

In this state, if the own vehicle is collided and an impact load is applied, the load applied to the occupant to be moved to the rear side RR is applied. Since the impact value associated with the secondary collision is equal to or greater than the load at which the return spring 12 for the active headrest starts to expand, the pressure receiving portion 26 is moved to the rear side RR, so that the return spring 12 for the active headrest expands. And the pressure receiving section 26
The headrest holder member 25 supporting the first headrest holder bracket 25 rotates to the front FR around the stepped bolt 5 and the bush 6. In this way, the headrest 3 is controlled to rotate to the front side FR via the straight portion 14 of the headrest support member 7 and the stay 13 supported by the second headrest holder bracket 22, and the head of the occupant can be reliably held, and the neck Can be protected.

Further, since the center of rotation of the headrest 3 is located on the side of the interposed portion 7e provided on the side frames 2 and 2, even if the stepped bolt 5 is provided, the foreign object does not feel. In addition, when a load due to a secondary collision of the occupant is applied to the pressure receiving portion 26, the side frame 2 rotates around the upper end portions 2 a, 2 a of the side frame 2, so that the side frame 2 is located at a position where it does not easily interfere with the occupant shoulder. As a result, the headrest 3 can move to the front side FR, and the occupant's neck can be reliably held.

Further, since the shoulder point of the occupant is at least the shoulder point of the AF05% tile mannequin, a pad (not shown) does not bite into the linear portion 14 of the first headrest holder bracket 25 and the second headrest holder bracket 22. Therefore, the linear portion 14 and the second headrest holder bracket 22 can smoothly move the rear surface of the pad, and the UP of the pad accompanying the rotation of the linear portion 14 and the second headrest holder bracket 22 is not hindered. The operation amount of the headrest 3 can be sufficiently ensured.

In this way, the back of the occupant is
By moving to the rear side RR, the head of the occupant who is supposed to be left will be surely held by the movement of the headrest 3. In addition, in this state, the lower end portion 20 of the straight portion 14 is bent in the shape of a “ku” toward the front side FR, so that when the pressure receiving section 26 moves to the rear side RR, the pressure receiving section 26 moves to the rear side RR. And the space with the rear passenger is secured.

The headrest holders 16, 1
6, the stays 13, 13 of the headrest 3 are supported so as to be vertically movable, so that the headrest 3 can be appropriately adjusted to the position of the head of an occupant having a different physique.

Further, since the side frames 2 and 2, the upper cross member 10 and the lower cross member 11 form a square, the strength of the seat back 1 is remarkably improved, and the pressure receiving portion 26 which receives a secondary collision is supported. There is no problem that the headrest support member 7 is deformed.

The pressure receiving portion 26 of the first headrest holder bracket 25 is constantly urged to the front side FR by the return spring 12 for the active headrest, and does not extend under a sitting load, but only under an impact load caused by a rear-end collision. Since the occupant is normally seated and relaxed, the active headrest return spring 12 does not extend in response to the backrest load of the occupant, so that the occupant can hold the back. Also, when a load due to a secondary collision due to a rear-end collision is applied,
Since the extension is possible, the movement of the pressure receiving portion 26 is not hindered, and the movement can be surely performed.

Due to the secondary collision, the headrest 3 is moved to the front side F
Even if the occupant is able to protect the occupant's neck by turning to R, the rotation angle to the front FR can be limited by the stopper surface 10b of the upper cross member 10, so that the front cross FR is abnormally rotated to the front FR. Failure is prevented.

The pressure receiving portion 26 is provided at a position corresponding to the back of the occupant where the impact load accompanying the rear-end collision can be received. Since the pressure receiving portion 26 is substantially L-shaped when viewed from the front, internal projections such as acute angles are formed. It does not occur, and it is inexpensive because an operating plate for receiving pressure is unnecessary.

In the above description of the operation, it is assumed that the head of the occupant 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. Even if the seat back 1 moves to the rear side RR due to the back of the occupant, the headrest 3 does not move with respect to the occupant's head, and is held at that position, thereby protecting the occupant's head. It also includes those described.

In the above description, the return spring for the active headrest is described as an example of the "biasing means". However, it is also possible to suspend the first headrest holder bracket 25 with a coil spring, a torsion coil spring, and a torsion bar. Of course.

[0041]

According to the first aspect of the present invention, the headrest supporting member supporting the stay of the headrest rotates back and forth with respect to the side frame, so that the center of rotation is in the side frame and does not give a foreign object feeling. . In addition, when the load due to the secondary collision of the occupant is applied to the pressure receiving part, it rotates around the upper end of the side frame, so it is in a position that does not easily interfere with the occupant's shoulder, and the headrest moves forward by that much It is possible to reliably hold the occupant's neck.

According to the second aspect of the present invention, since the pressure receiving portion corresponding to the occupant's back, which is a position where the impact load accompanying the rear-end collision can be received, is substantially L-shaped with respect to the straight portion in front view. In addition, it is inexpensive due to the elimination of a pressure receiving operation plate and the like, and the weight can be significantly reduced even when only one vertical portion is provided and a horizontal portion is added thereto.

According to the third aspect of the present invention, since the side frame and the upper cross member form a square, the strength of the seat back is remarkably improved, and the headrest supporting member for supporting the pressure receiving portion for receiving the secondary collision is provided. There is no trouble such as deformation.

According to the fourth aspect of the present invention, the first
The pressure receiving portion of the headrest holder bracket is always urged forward and does not extend under a sitting load, but interposes an urging means that can be extended only by the impact load accompanying a rear-end collision, so that the occupant can normally sit down. In the relaxed state, the urging means does not extend in response to the backrest load of the occupant's back, and the back can be held. Further, when a load due to a secondary collision due to a rear-end collision is applied, the pressure receiving portion can be extended, so that it does not hinder the movement of the pressure receiving portion, and can move reliably.

According to the fifth aspect of the invention, even if the headrest rotates forward due to the secondary collision and the occupant's neck can be protected, the stopper surface limits the forward rotation angle. Since it is possible, the occurrence of the problem of abnormally rotating to the front side is prevented.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view showing a seat back according to an embodiment of the present invention.

FIG. 2 is a perspective view of FIG. 1;

FIG. 3 is an enlarged perspective view of a main part of FIG. 2;

FIG. 4 is a sectional view taken along the line SA-SA of FIG. 3;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Seat back 2 Side frame 3 Headrest 4 Seatback frame 5,6 Rotating hinge 7 Headrest support member 10 Upper cross member 10a Stopper surface 12 Return spring for active headrest as urging means 13 Headrest stay 14 Linear part 22 Second headrest holder Bracket 25 First headrest holder bracket 26 Pressure receiving part FR Front side RR Rear side UP Upper side LWR Lower side

Claims (5)

[Claims] 1. A seat back frame having at least side frames on both sides, a headrest support member erected between the upper ends of the side frames so as to be rotatable back and forth, A first headrest holder bracket having a pressure receiving portion disposed at a position where the pressure receiving portion is supported at a position biased to one side and capable of receiving an impact load due to a rear-end collision; A second headrest holder bracket supported in the vertical position and penetrated up and down, and a stay supported by the linear portion of the first headrest holder bracket and the second headrest holder bracket so as to be vertically movable. At least a headrest supported by the stay An automobile seat back characterized in that: 2. The vehicle seat back according to claim 1, wherein the straight portion and the pressure receiving portion of the first headrest holder bracket form a substantially L shape in a front view. Seat back. 3. The vehicle seat back according to claim 1, wherein an upper cross member is fixedly provided between upper ends of the side frames. For seat back. 4. The vehicle seat back according to claim 1, wherein the pressure receiving portion of the first headrest holder bracket is constantly urged to the front side and extended by a seating load. Without
An automobile seat back comprising an urging means that can be extended only by an impact load caused by a rear-end collision. 5. The vehicle seat back according to claim 1, wherein the upper cross member is provided with a rotation of the headrest support member when the headrest support member rotates forward. A seat back for an automobile, characterized in that a stopper surface for preventing the occurrence of a vehicle is formed.