JP3522602B2 - Car seat back - Google Patents

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 the cervical vertebrae of a vehicle occupant when the vehicle is hit by another vehicle.

[0002]

2. Description of the Related Art As a conventional seat back of such an automobile, as shown in, for example, Japanese Patent Application Laid-Open No. 10-19619, a side frame member having a rotary hinge is provided on the front side of an upper end portion of a side frame, and a rear collision is performed. Is equipped with a pressure receiving part.

Therefore, for example, when the vehicle is rear-end hit, a shocking load toward the front side (primary collision) first acts on the seat back, and then a reaction load by the occupant (secondary collision). Say) acts toward the rear side. That is, the load acts on the pressure receiving portion. At that time, by moving the pressure receiving portion to the rear side, the horizontal frame rotates to the front side around the front rotary hinge, and the headrest supported by the horizontal frame moves to the occupant's head equivalent portion. Then, the headrest operates in a direction approaching the occupant's head.

Therefore, even if the seat back bends backward due to the reaction load of the occupant of the vehicle when the vehicle struck later, the headrest of the occupant's head is instantaneously caused by the reaction load to cause the pressure receiving portion to use the lever principle. Since the occupant's head is securely received by the headrest, the occupant's cervical spine is protected.

[0005]

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

The present invention has been made by paying attention to such a conventional technique, and the position of the center of rotation when the headrest moves to the front side does not give the occupant a feeling of foreign matter, and the pressure receiving portion (EN) Provided is a vehicle seat back, which aims to move a headrest forward by an amount corresponding to the amount of depression.

[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 thereof, and a headrest support rotatably mounted in a front and rear direction between upper end portions of the side frames. Members,
A pressure receiving member having an upper end supported at a substantially central portion of the headrest support member, and a pressure receiving portion arranged at the lower end at a position capable of receiving an impact load caused by a rear impact, a position sandwiching the pressure receiving member, and the headrest. At least a headrest holder bracket supported by a support member and a headrest supported by the headrest holder bracket so as to be vertically movable.

According to the first aspect of the present invention, when the load due to the secondary collision of the occupant is applied to the pressure receiving portion, the headrest supporting member supporting the headrest rotates back and forth with respect to the side frame. Since the center of rotation is on the side frame, there is no sense of foreign matter to the passenger. Further, the headrest holder bracket that rotates together with the headrest is located at a position where it is less likely to interfere with the shoulder portion of the occupant, and the headrest can be moved forward by that amount, so that the neck portion of the occupant can be reliably held.

The invention according to claim 2 is the vehicle seat back according to claim 1, wherein an upper end portion and a lower end portion of the pressure receiving member are substantially I-shaped in a front view.

According to the second aspect of the present invention, the upper end portion of the pressure receiving member and the pressure receiving portion corresponding to the occupant's back, which is the position where the impact load due to the rear impact can be received, are substantially I-shaped when viewed from the front. Therefore, since a pressure receiving actuating plate and the like are unnecessary, the cost is low, and only one vertical portion is provided, so that the weight can be significantly reduced.

The invention according to claim 3 is the vehicle seat back according to claim 1 or 2, wherein an upper cross member is fixedly installed between the 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 rectangular shape, the strength of the seat back is significantly improved, and the headrest support member for supporting the pressure receiving portion for receiving the secondary collision is provided. There is no problem such as deformation.

The invention according to claim 4 is the vehicle seat back according to any one of claims 1 to 3, wherein the pressure receiving portion of the pressure receiving member is always biased to the front side. An urging means is provided which does not extend under a seating load and can extend only under an impact load associated with a rear-end collision.

According to the fourth aspect of the present invention, the pressure receiving portion of the pressure receiving member is always biased to the front side and is not extended by a seating load, but is extended only by an impact load due to a rear impact. Since the means is interposed, the urging means does not extend in response to the backrest load of the occupant's back when the occupant is seated or in a relaxed state in normal times, and the back can be held. Further, when a load due to a secondary collision due to a rear-end collision is applied, the load can be expanded, so that the pressure receiving portion is not hindered from moving, and the pressure receiving portion can be moved reliably.

The invention according to claim 5 is the vehicle seat back according to any one of claims 1 to 4, wherein the pressure receiving portion is covered with the synthetic resin cover. The biasing means is locked by a lock portion formed on the cover.

According to the fifth aspect of the present invention, even if the biasing means and the pressure receiving portion are rubbed, the synthetic resin cover is interposed, so that the rubbing noise is less likely to occur. Further, since the biasing means is securely locked by the lock portion formed on the cover, the pressure receiving member is reliably prevented from coming off regardless of how the pressure receiving member rotates.

A sixth aspect of the present invention is the vehicle seat back according to any one of the first to fifth aspects, wherein the upper cross member has the headrest support member rotated forward. And a stopper surface for preventing the headrest support member from rotating.

According to the sixth aspect of the present invention, even if the headrest rotates forward due to a secondary collision to protect the occupant's neck, the stopper surface limits the rotation angle to the front. As a result, it is possible to prevent the occurrence of the trouble of abnormally rotating to the front side.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. In the following description, FR is the front side, RR is the rear side, UP is the upper side, and LWR is the lower side.

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

The seat back 1 has a seat back frame 4 having at least side plates 2 and 2 made of iron plates on both sides, and rear side RRs of upper ends 2a and 2a of the side frames 2 and 2 of the seat back frame 4. A headrest support member 7 made of an iron plate rotatably installed in the front and rear FR, RR by a stepped bolt 5 and a bush 6 for absorbing rubbing noise and impact during rotation, and an upper end portion of the headrest support member 7. A plate-shaped pressure-receiving member 30 crushed from a pipe, in which a pressure-receiving portion 32 is arranged at a lower end position where 31 is supported by the welding GW and can receive a secondary impact load due to a rear-end collision, and a headrest supporting the headrest 3. It is composed of holder brackets 22 and 22.

The seat back frame 4 includes the side frames 2 and 2 and an upper end portion 2 of the side frame 2.
The upper cross member 10 is installed substantially horizontally between the front FRs a and 2a, and the lower cross member 11 is installed substantially horizontally on the lower end portions 2b and 2b of the side frame 2. The frame 2, the upper cross member 10, and the lower cross member 11 are mutually supported by welding. Between the side frames 2 and 2,
A return spring 12 for an active headrest, which is a "biasing means" and does not bend under the load during normal use;
Riding comfort springs 35, 35 that can be bent under the load during normal use are arranged, and the clips 17, 17, 1 are provided.
It is built between 7 The active headrest return spring 12 and the riding comfort spring 35 both have an S-shape, but the spring constants differ greatly as described above.

As shown in FIG. 3, a cover 34 made of synthetic resin covers the lower end portion of the pressure receiving member 30, which is the pressure receiving portion 32, and a part of the return spring 12 for the active headrest is directly attached to the cover 34. By being engaged by the locking portion 35, the pressure receiving portion 32 is always biased to the front side FR. Further, the active headrest return spring 12 has a "spring force" that does not expand under a seating load of an occupant (not shown) but can expand only under a secondary impact load due to a rear-end collision.

As shown in FIG. 4, the headrest support member 7 has a hollow headrest holder bracket 22.
An upper surface portion 7a horizontally extending horizontally having an upper and lower through hole 19 through which the upper end portion of the headrest holder bracket 30 is inserted, and a rear end RR of the headrest holder bracket 30 from the rear end portion of the upper surface portion 7a. The rear surface portion 7b that is hung down is bent and formed at a right angle. The upper end 31 of the headrest holder bracket 30 is supported by the welding GW on the front FR surface of the rear surface portion 7b. Further, an upper cross member 10 described later is provided at the lower end of the rear surface portion 7b.
A second stopper portion 7c is formed to hang further downward at a position separated from the lower member 10a. As shown in FIG. 3, the front FR is provided at both left and right ends of the rear surface portion 7b.
The intervening portions 7e and 7e formed by bending are respectively provided.

A first stopper portion 7d is formed at a front end portion of the upper surface portion 7a, and the first stopper portion 7d and the second stopper portion 7c have lower members of the upper cross member 10 which will be described later. Cushioning members 18, 18 that prevent metal contact with 10a and the stopper surface 10b are respectively arranged.

As shown in FIG. 4, the upper cross member 10 has a U-shaped cross section in which the front side FR is closed and the rear side RR is opened, and the lower member 10a is the headrest holder bracket 30 as it is. When the headrest support member 7 rotates to the front side FR, the first stopper portion 7d of the headrest support member 7 comes into contact with the headrest support member 7 to prevent the headrest support member 7 from rotating. The stopper surface 10b is formed.

The headrest holder bracket 22,
A headrest holder 1 made of synthetic resin is provided in the middle of 22.
6 and 16 are fitted respectively, and stays 13 and 13 of the headrest 3 are attached to the headrest holders 16 and 16 so as to be vertically movable. Further, the pressure receiving portion 32 is formed such that the position where the pressure receiving portion 32 is arranged is near the back portion of an occupant (not shown) and is close to the front side FR. The stay 13 of the headrest 3 is formed so as to rise to a predetermined position upper side UP so as to avoid an occupant's shoulder equivalent portion (not shown), and then to be inclined to the front side FR.

Further, the lower ends 13 of the stays 13, 13 supported by the headrest holder brackets 22, 22.
a and 13a are headrest holder brackets 22 and 2
Although exposed from 2, the lower end portions of the headrest holder brackets 22 and 22 themselves are in the headrest support member 7 and do not project, and since the stays 13 and 13 are thin, when the headrest 3 rotates to the front side FR. , The lower ends 13a of the stays 13, 13 rotated to the rear side RR,
The amount of protrusion of 13a is small.

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

In a driving state in which the occupant is seated on a seat cushion composed of the seat back 1 and a seat cushion (not shown) and the back is not leaning against the seat back 1, the head of the occupant and the headrest 3 are separated. There is a gap therebetween, and a gap is also formed between the occupant's back and the pressure receiving portion 32. However, the back of the occupant and the pressure receiving portion 32
A pad, a skin member, and the like (not shown) are interposed between and. When the occupant is sitting,
When leaning against the seat back 1, the load applied from the back of the occupant allows the pad to bend and move to the rear RR, so that the occupant's back can be received softly. Therefore, the sitting feeling is good. Of course, no load is applied to the pressure receiving portion 32.

In this state, when the own vehicle is rear-end hit and an impact load is applied, the load moved to the rear RR is applied to the occupant. Since the impact value associated with such a secondary collision is equal to or greater than the load at which the active headrest return spring 12 begins to expand, the pressure receiving portion 32 is moved to the rear side RR, so that the active headrest return spring 12 expands. And the pressure receiving portion 32
The pressure receiving member 30 having the arrow starts to rotate, and the headrest support member 7 supporting the pressure receiving member 30 rotates around the stepped bolt 5 and the bush 6 toward the front side FR. Thus
When the headrest support member 7 rotates, the headrest 3 is rotationally controlled to the front side FR via the stays 13 and 13 held in the headrest holder brackets 22 and 22 supported by the headrest support member 7, The head of the occupant can be securely held, and the neck can be protected.

Further, since the center of rotation of the headrest 3 is located on the side of the interposition part 7e provided on the side frames 2 and 2, even if the stepped bolt 5 is provided, the foreign object is not felt. Further, when a load due to a secondary collision of an occupant is applied to the pressure receiving portion 32, the pressure receiving portion 32 rotates around the upper end portions 2a, 2a of the side frames 2 and 2, so that the shoulder portion of the occupant is less likely to interfere with the load. Therefore, the headrest 3 can be moved to the front side FR, and the occupant's neck can be reliably held.

Further, even if the active headrest return spring 12 and the pressure receiving portion 32 rub against each other, the synthetic resin cover 34 is interposed, so that rubbing noise is unlikely to occur. Further, since the active headrest return spring 12 is securely locked by the lock portion 35 formed on the cover 34, the pressure receiving member 30 is reliably prevented from coming off regardless of how it is rotated. Become.

In this way, the back of the occupant is impacted,
By moving to the rear side RR, the head of the occupant who should be left behind is reliably held by the movement of the headrest 3. Moreover, in this state, the lower ends 13a, 13a of the stays 13, 13 of the headrest 3 are
Since it is thin by itself, when the pressure receiving portion 32 moves to the rear RR, the lower end portion 13a of the stay 13 does not project to the rear RR, and a space for the rear seat occupant is secured.

Further, the headrest holders 16 and 1
Since the stays 13, 13 of the headrest 3 are supported movably in the vertical direction, the headrest 3 can be appropriately matched with 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 rectangular shape, the strength of the seat back 1 is remarkably improved and the pressure receiving portion 32 for receiving the secondary collision is supported. The headrest support member 7 is prevented from being deformed.

The pressure receiving portion 32 of the pressure receiving member 30 is
Always active headrest return spring 12
As a result, it is urged by the front side FR and does not expand under the seating load, but can expand only under the impact load associated with a rear-end collision.
The active headrest return spring 12 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 load can be expanded, so that it does not hinder the movement of the pressure receiving portion 32 and can reliably move.

Due to the secondary collision, the headrest 3 is moved to the front side F
Even if the neck portion of the occupant can be protected by rotating to R, the rotation angle to the front FR can be limited by the stopper surface 10b of the upper cross member 10, and therefore the front cross member abnormally rotates to the front FR. The occurrence of defects is prevented.

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. However, 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 by the occupant's back, the headrest 3 does not move relative to the occupant's head and is held at that position, thereby protecting the occupant's head. It also includes what is described.

In the above description, the return spring for the active headrest has been described as an example of the "biasing means", but it goes without saying that a coil spring, a torsion coil spring, a torsion bar or the like may be suspended on the pressure receiving member 30. is there.

[0041]

According to the first aspect of the invention, when a load due to a secondary collision of an occupant is applied to the pressure receiving portion, the headrest supporting member supporting the headrest rotates back and forth with respect to the side frame. , The center of rotation is on the side frame, and the occupant does not feel a foreign object. Also,
The headrest holder bracket that rotates together with the headrest is located at a position where it does not easily interfere with the shoulder of the occupant, and accordingly, the headrest can be moved to the front side, so that the neck of the occupant can be reliably held.

According to the second aspect of the present invention, the upper end portion of the pressure receiving member and the pressure receiving portion corresponding to the back portion of the occupant, which is the position where the impact load due to the rear impact can be received, are substantially I-shaped in a front view. Therefore, since a pressure receiving actuating plate and the like are unnecessary, the cost is low, and only one vertical portion is provided, so that the weight can be significantly reduced.

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

According to the fourth aspect of the present invention, the pressure receiving portion of the pressure receiving member is always biased to the front side and is not extended by a seating load, but is extended by only an impact load associated with a rear impact. Since the means is interposed, the urging means does not extend in response to the backrest load of the occupant's back when the occupant is seated or in a relaxed state in a normal state, and the back can be held. Further, when a load due to a secondary collision due to a rear-end collision is applied, the load can be expanded, so that the pressure receiving portion is not hindered from moving, and the pressure receiving portion can be moved reliably.

According to the fifth aspect of the present invention, even if the biasing means and the pressure receiving portion are rubbed, the synthetic resin cover is interposed, so that the rubbing noise is unlikely to occur. Further, since the biasing means is securely locked by the lock portion formed on the cover, the pressure receiving member is reliably prevented from coming off regardless of how the pressure receiving member rotates.

According to the sixth aspect of the present 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 rotation angle to the front. As a result, it is possible to prevent the occurrence of the trouble of abnormally rotating to the front side.

[Brief description of 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.

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

FIG. 4 is a sectional view taken along the line SA-SA in FIG.

[Explanation of symbols]

1 Seat Back 2 Side Frame 3 Head Rest 4 Seat Back Frame 5, 6 Rotation Hinge 7 Head Rest Support Member 10 Upper Cross Member 10a Stopper Surface 12 Active Head Rest Return Spring 13 as Biasing Means Head Rest Stay 22 Head Rest Holder Bracket 30 Pressure Receiving Member 32 Pressure receiving part FR Front side RR Rear side UP Upper side LWR Lower side

Continuation of front page (58) Fields investigated (Int.Cl. ⁷ , DB name) B60N 2/42 A47C 7/38 A47C 7/44 B60N 2/48

Claims (6)

(57) [Claims] 1. A seat back frame having at least side frames on both sides, a headrest support member rotatably mounted in the front-rear direction between upper end portions of the side frames, and an upper end at a substantially central portion of the headrest support member. Pressure receiving member in which a pressure receiving portion is disposed at a lower end portion at a position where the pressure receiving portion is supported and can receive an impact load due to a rear impact, and a headrest which is a position sandwiching the pressure receiving member and supported by the headrest supporting member. A vehicle seatback comprising at least a holder bracket and a headrest supported by the headrest holder bracket so as to be vertically movable. 2. The vehicle seat back according to claim 1, wherein an upper end portion and a lower end portion of the pressure receiving member are substantially I-shaped in a front view. 3. The vehicle seat back according to claim 1 or 2, wherein an upper cross member is fixedly installed between upper end portions of the side frames. Seat back. 4. The vehicle seat back according to claim 1, wherein the pressure receiving portion of the pressure receiving member is always biased to the front side and does not extend under a seating load. An automobile seat back characterized by interposing an urging means capable of expanding only by an impact load caused by a rear-end collision. 5. The automobile seat back according to claim 1, wherein the pressure receiving portion is covered with the synthetic resin cover and a lock formed on the cover. A seat back for an automobile, wherein the urging means is locked by a portion. 6. The vehicle seat back according to claim 1, wherein the upper cross member has 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 above is formed.