JP3522548B2 - 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 that protects an occupant's cervical spine when the vehicle is hit later.

[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,
The seat back frame (9), a support means (5) supported by an upper end portion of the seat back frame (9) so as to be rotatable back and forth and vertically movable, and the support means (5). A headrest (4), which is vertically movably supported by a headrest holder (not shown) attached to a stay (27) at the upper end, and a occupant, which is supported by the lower end of the support means (5). Pressure receiving member (10) that is movable by receiving the pressure of the back of the vehicle, and a coiled spring (10) that biases the pressure receiving member (10) to the front side when the load from the occupant is not applied to the pressure receiving member (10). 16), a skin member covering the seat back frame (9), and a pad interposed between the seat back frame and the skin member.

Therefore, for example, when the own vehicle is rear-end hit, an impact load toward the front side acts on the seat back (3), 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) which are installed between the seat back frames (9). At this time, the pressure receiving member (10) moves rearward, so that the upper end portion of the supporting means (5) pivots forward with the upper side portion (24) of the seat back frame (9) as a pivotal fulcrum. Together with this, the headrest (4), which is moved upward and is supported by the upper end of the support means (5), operates in a direction approaching the occupant's head.

Therefore, even if the seat back (3) bends rearward due to the reaction load of the occupant when the vehicle is rear-end collided, the headrest (4) instantly operates to approach the occupant's head. The head of the vehicle is securely received by the headrest (4) to protect the occupant's neck.

[0005]

However, in such a conventional technique, since the load on the rear side of the occupant is applied to the supporting means (5) through the pad, the supporting means (5) is provided. May be suppressed. Further, since the back surface of the pad and the supporting means are intervened by a slippery film so as not to be directly rubbed, it causes a cost increase.

The present invention was made by paying attention to such a conventional technique. Even if a load on the rear side of an occupant is applied through the pad, the support means is not held down and the pad is used. The present invention provides a vehicle seat back intended to reduce the cost between the back surface of the vehicle and the support means.

[0007]

According to a first aspect of the present invention, there is provided a seat back frame, and support means which is supported by an upper end portion of the seat back frame so as to be rotatable back and forth and vertically movable. A headrest holder arranged at the upper end of the supporting means, a headrest supported by the supporting means via the headrest holder, and a pressure on the back of an occupant supported by the lower end of the supporting means. A seat back for an automobile, comprising at least a pressure receiving member that is movable in response to receiving force, a skin member that covers the seat back frame, and a pad that is interposed between the seat back frame and the skin member. The back frame is provided with a front member that prevents the pad from interfering with the supporting means during a rear-end collision.

According to a second aspect of the present invention, there is provided the vehicle seat back according to the first aspect, wherein the seat back frame includes a rear member supporting the supporting means, and the rear member. The front member is arranged on the front side and can be fixed at an appropriate position in the front and rear.

A third aspect of the present invention is the vehicle seat back according to the first or second aspect, wherein the front member and / or the rear member has a holder bracket with an upper end portion of the supporting means. It is supported through.

The invention according to claim 4 is the vehicle seat back according to claim 1 or 2, wherein the front member and the rear member are penetrated by an upper end portion of the supporting means. A hole is formed.

[0011]

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 5 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 includes a seat back frame 2 made of an iron plate, a pad 42 made of polyurethane foam or the like arranged in front of and behind the seat back frame 2, and a cloth made of cloth for covering the pad 42. Epidermis 4
And at least one.

The seat back frame 2 has an upper frame 2a formed in a substantially horizontal shape, and a substantially left-right symmetrical side frame 2b arranged at a position suspended from the left and right end portions of the upper frame 2a. 2b ′ and an underframe 2c that is installed between the lower ends of the side frames 2b and 2b ′, and are supported by welding.

The upper frame 2a is arranged on the front side FR and has holding portions 8 and 8 of an armature pipe 7 as a supporting means which will be described later penetrating vertically, and the holding portions 8 and 8 can freely move back and forth. Front part 40 of the long hole 40
a front member 2aa formed of a, and holding portions 8 of an armature pipe 7 as a supporting means, which are arranged on the rear side RR and described later, are vertically penetrated, and the holding portions 8 and 8 are moved back and forth. The rear part 4 of the long hole 40
0b is formed into a hollow box shape together with the rear member 2ab. Strength members 2ac and 2ac ′ are installed on both ends of the rear member 2ab and upper ends of the side frames 2b and 2b ′.

The front member 2aa has a surface on the front side so as to prevent the pad 42 from interfering with the holding portion 8 of the armature pipe 7 as the supporting means described later at the time of a rear-end collision, and the holding portion has the front surface. The rear member 2ab, which supports 8 by means described later, is disposed on the front FR and can be fixed at an appropriate position in the front-rear direction.

The front member 2aa and the rear member 2ab are formed with a through hole 40 through which the upper end 8b of the holding portion 8 passes.

On each of the side frames 2b, 2b ', there is supported a bracket 5, 5'which is formed of an iron plate in a plate shape. A projection nut 5a is welded to each of the brackets 5 and 5 ', and one end portion 6a of the operation link 6 and 6'is fixed by a bolt 20 screwed to and supported by the projection nut 5a.
6a 'is rotatable in the front and rear FR and RR directions,
Each is supported. A bush 21 is interposed between the bolt 20 and the operating links 6, 6 '.
Between the other ends 6b and 6b 'of the operation links 6 and 6', ends 4a and 4a 'of the pressure receiving member 4 described later are rotatably supported by the rivet 22 and the bush 21.

Coil-shaped springs 18, 18 as biasing means are arranged between the spring hooks 23, 23 'of the side frames 2b, 2b' and the operating links 6, 6 ', respectively. The other ends 6b and 6b 'of the operating link 6 are constantly urged toward the front FR.

The pressure receiving member 4 is formed by a rigid body such as an iron plate so as to extend in the left-right direction and is formed in a rectangular shape. The upper side of the armature pipe 7 between the holding portions 8, 8 has an inclined surface rising rearward. The part 9 is formed. A protector 31 made of synthetic resin is arranged behind the pressure receiving member 4 so as to cover the pressure receiving member 4, and is supported by the pressure receiving member 4 itself by a rivet or the like (not shown).

The upper frame 2a is a front member 2a.
a is squeezing out to the front side. A holder bracket 12 is arranged at the lower central portion of the eaves, and both end portions 1
2a and 12a are supported by the front member 2aa by welding. Supporting portions 12b, 12b formed in a U-shape in a lateral cross section are provided at positions separated from the center of the holder bracket 12 to the left and right.

Inside the support portions 12b, 12b, armature holders 11, 11 made of synthetic resin are arranged so as to be movable back and forth and up and down. The armature holders 11, 1
1 is supported by the upper ends 8b of the pipe-shaped holding portions 8, 8 of the armature pipe 7, so that the support portions 12b, 12b of the holder bracket 12 support the armature pipes via the armature holders 11, 11. The holding units 8 and 8 of 7 are held.

Holding portions 8, 8 of the armature pipe 7
Are arranged side by side in the right and left in a front view to form a vertical shape, and the holding positions of the holding portions 8 are at least AF05 in the front view.
% The tile mannequin (SAE) is arranged on the center side of the shoulder point. AF 05% tile mannequin (S
AE) is arranged on the center side of the shoulder point, which means that the holding portions 8 are arranged on the inner side of the shoulder points of most occupants 30 of the adult physique. Even if load is applied from the front side FR of the seat back frame 2 due to the rear-end collision of the vehicle, the shoulder of the occupant 30 does not interfere.

Further, the rear portions of the holding portions 8 and 8 are formed by bending the front portions of the holding portions 8 and 8 in a V shape in a side view. The bent portion 8a corresponds to the stay 1 of the headrest 3.
The inner surfaces are curved surfaces having a radius of 20 mm, which are formed at positions close to each other so as not to interfere with the lower end portions 13a and 13a of the reference numerals 3 and 13.

Further, as described above, the stays 13, 8 of the headrest 3 are slidably supported in the holding portions 8, 8 through the armature holders 11, 11. At the upper end 8b of the holding portions 8 and 8,
Head stay holders 14, 14 made of synthetic resin capable of controlling the vertical positions of the stays 13, 13 are held. Reference numeral 15 shown in FIG. 3 is a frame of the headrest 3.

The first stopper 24, which is supported by the rear member 2ab of the upper frame 2a of the seatback frame 2, directly contacts the upper end 8b of the holding portion 8.

Reference numeral 16 in FIG. 3 indicates the side frame 2
It is an S-shaped spring supported by b and 2b 'via hooks 17 and 17', and is arranged at a position below the pressure receiving member 4. Similarly, reference numeral 24 in FIG. 3 is supported by the upper frame 2a at the position of the rear side RR of the holding portion 8 so that the upper end portion 8b of the holding portion 8 does not rotate to the rear side RR beyond this position. Rubber-like first stopper to prevent, 3
Reference numeral 4 denotes a wire-shaped second stopper which is arranged on one side of the holding portion 8 and prevents the upper end portion 8b of the holding portion 8 from rotating to the front side FR beyond this position.

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

As shown in FIG. 1, the occupant 30 is seated on the seat 26.
Seated on the seat cushion 27 of the seat back 1
In a normal state in which the back 30a is leaning on the back, there is a slight gap A between the head 30b of the occupant 30 and the headrest 3,
A slight gap B is formed between the back 30a of the occupant 30 and the pressure receiving member 4. Although the pad 42 and the skin member 41 are interposed between the back 30a 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.

In this state, when the own vehicle is rear-end collided and the seated occupant 30 is pushed to the rear RR by the secondary collision and the pads 42 and the like move to the rear RR, the occupant's back 3
0a causes the pressure receiving member 4 to pass through the pad 42 and the like to the rear side R.
Pushed by R. Even if the pad 42 and the like move to the rear RR due to the load in the rear RR direction by the occupant 30, the occupant 3
Since the shoulder point of 0 is the shoulder point of at least the AF05% tile manikin, the pad 42 and the like do not bite into the holding portion 8 of the armature pipe 7. Therefore, the rise of the holding portion 8 due to the rotation is not hindered, and the operation amount of the headrest 3 can be sufficiently secured.

Operation link 6 supporting the pressure receiving member 4.
Is urged to rotate about the bolt 20, and the other end 6b of the operating link 6 is moved from the position shown in FIG. 1 to the position shown in FIG. , And is rotated around the bolt 20 in the upper UP and rear RR directions.

In this way, when the other end 6b of the operating link 6 rotates to the upper side UP and the rear side RR, the lower end of the armature pipe 7, that is, the pressure receiving member 4 moves to the upper side UP and the rear side RR. With the movement, the armature pipe 7
The headrest holders 14 and 14 together with the upper end portions of the above, that is, the upper end portions 8b and 8b of the holding portions 8 and 8 approach the upper side UP and the front side FR. By the upward movement, the stay 13 of the headrest 3 is also moved to the upper side UP and the front side FR. In other words, the upper end portions 8b, 8 of the holding portions 8, 8
Since b is contained in the hollow box of the front side member 2aa and the rear side member 2ab, the load is not added in the form of holding down the holding portion 8, especially the upper end portion 8b thereof via the pad 42, and the holding portion 8 The movement of the upper end 8b of the is not blocked.

Further, since the pad 34 prevents the pad 34 and the holding portion 8 from interfering with each other by the front side member 2aa of the seat back frame 2, rubbing between them cannot occur and abnormal noise does not occur. Alternatively, the front member 2 that constitutes the seat back frame 2 is a means for preventing the generation of abnormal noise.
Since it is composed of aa, it does not cause a cost increase. Further, since the pad 34 can move along the front side member 2aa of the seat back frame 2, a sliding area can be secured.

The upper frame 2a of the seatback frame 2 includes a rear member 2ab supporting the holding portion 8 via a holder bracket 12, and the rear member 2a.
Since the front member 2aa is disposed on the front side FR with respect to b and can be fixedly installed at an appropriate front and rear position, even if the front and rear movement dimensions of the headrest 3 differ depending on the type of vehicle, the seat back Even if the frame 2 is not formed by a separate mold, it can be dealt with only by changing the supporting positions of the front side member 2aa and the rear side member 2ab, so that the cost is significantly reduced.

The front member 2aa and / or the rear member 2
Since the upper end portion 8b of the holding portion 8 is supported on the ab via the holder bracket 12, the lower end portion of the holding portion 8 is pushed by the pressure receiving member 4 and the rear side RR and the upper side U.
By moving to P, the holder bracket 12, which is the center of rotation when the headrest 3 supported by the upper end portion 8b of the holding portion 8 moves to the front side FR and the upper side UP, is protected by the front side member 2aa of the seatback frame 2. Will be.

Since the front member 2aa and the rear member 2ab form a through hole 40 through which the upper end portion 8b of the holding portion 8 penetrates, the front and rear movement dimensions of the headrest 3 differ depending on the type of vehicle. However, the cost can be significantly reduced because the front member 2aa and the rear member 2ab can be supported simply by changing the supporting positions without molding with a separate mold.
Tuning can be done easily.

As described above, the holding portions 8 and 8 and the stay 1
3, 3 and 13 move together around the holder bracket 12, the headrest 3 supported by the stays 13, 13 has a head 30b of the occupant 30 as shown in FIG.
Will come into contact with. In FIG. 5, the headrest 3
Is illustrated as biting into the head 30b of the occupant 30, but the headrest 3 has a recessed center in the left and right,
As is well known, the head portion 30b of the occupant 30 has a substantially columnar cross section, and therefore does not bite into it.

In this way, the upper body of the occupant 30 is the rear RR.
When the headrest 3 moves, the head 30b of the occupant 30 that behaves as it is left is reliably held by the movement of the headrest 3. At this time, since the slope portion 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 be smoothly moved along the rear surface of the pad 52. In other words, it is difficult for the pressure receiving member 4 to bite into the pad 52.

In this state, the rear surface of the holding portion 8 is bent to the front side with respect to the pressure receiving member 4 in a V shape, so that when the pressure receiving member 4 is moved to the rear side RR, as shown in FIG. As shown in, the pressure receiving member 4 does not project to the rear RR, and a space with the rear seat occupant is secured.

Further, the headrest holders 14 and 1
4, the stays 13, 13 of the headrest 3 are supported so as to be vertically movable, so that the headrest 3 can be appropriately matched with the position of the head 30b of the occupant 30 having a different physique.

Further, a spring 18 for urging the pressure receiving member 4 toward the front side FR is supported between the actuation link 6 and the side frame 2b of the seat back frame 2, so that the back of the occupant 30 is backed up. Rear side R by 30a
When the pushing force to R is not applied, the spring 18
Therefore, 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 8 fits in the position of the rear RR by the seesaw principle, the comfortability of the occupant 30 is not impaired.

In the above description of the operation, the head 30b of the occupant 30
However, although it is assumed that the headrest 3 is reliably 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 rearward by the back 30a of the occupant 30. Even when moving to RR, the headrest 3 does not move with respect to the head 30b of the occupant 30,
It is also included that the head 30b of the occupant 30 is protected by being held at that position.

[0043]

According to the invention described in claim 1, since the seat back frame is provided with the front member which prevents the pad from interfering with the supporting means at the time of a rear-end collision, the pad is provided. Even if a load is applied to the pressure receiving member via
The load is not applied in the form of holding the supporting means via the pad, and the movement of the supporting means is not blocked. Further, since the pad prevents the pad and the supporting means from interfering with each other by the front member of the seat back frame, rubbing between the two cannot occur, and abnormal noise is not generated, but also abnormal noise is prevented. Since the means is constituted by the front side member constituting the seat back frame, it does not cause a cost increase. Moreover, since the pad can move along the front member of the seat back frame, the sliding area is secured.

According to the second aspect of the present invention, the seat back frame is provided with a rear side member supporting the supporting means and a front side with respect to the rear side member, and is fixed at an appropriate front and rear position. Since it is composed of a front member that can be installed, the front and rear members can be supported even if the front and rear movement dimensions of the headrest differ depending on the type of vehicle and the seatback frame is not molded separately. Cost can be significantly reduced because it can be handled by simply changing the position.

According to the third aspect of the invention, since the upper end of the supporting means is supported by the front member and / or the rear member via the holder bracket, the lower end of the supporting means receives the pressure. The holder bracket, which is the center of rotation when the headrest supported by the upper end portion of the support means moves forward and upward by being pushed by the member and moves backward and upward, is protected by the front member of the seatback frame. Will be.

According to the fourth aspect of the present invention, the front member and the rear member are formed with a through hole through which the upper end portion of the supporting means penetrates. Even if the movement size is different, it can be coped with by simply changing the supporting positions of the front member and the rear member without molding with a separate mold. Therefore, the cost can be remarkably reduced and the tuning can be facilitated.

[Brief description of drawings]

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

FIG. 2 is a front view of the seat back excluding the occupant of FIG.

FIG. 3 is an exploded perspective view of FIG.

FIG. 4 is a perspective view of a main part of the seat back frame of FIG.

5 is a cross-sectional view showing the operation embodiment of FIG.

[Explanation of symbols]

1 seat back 2 seat back frame 2a Upper frame of seat back frame 2aa Front member 2ab rear member 2b Side frame of seat back frame 3 headrest 4 Pressure receiving member 7 Armature pipe as support means 8 Armature pipe holder 8b Upper end of holding part 11 Armature holder 13 Headrest stay 14 headrest holder 24 First stopper 26 sheets 30 crew 30a Crew's back 30b Crew head 40 long hole 41 Skin material 42 pads FR front side RR behind UP upper side LWR lower side

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

Claims (4)

(57) [Claims] 1. A seat back frame, a support means supported by an upper end portion of the seat back frame so as to be rotatable back and forth and vertically movable, and a headrest provided at an upper end portion of the support means. A holder, a headrest supported by the supporting means via the headrest holder, a pressure receiving member supported by a lower end portion of the supporting means and movable under the pressure of the back of an occupant, and the seat back A skin member that covers the frame,
A vehicle seat back including at least a pad interposed between the seat back frame and a skin member, wherein the seat back frame prevents the pad from interfering with the supporting means during a rear-end collision. A vehicle seat back comprising a front member. 2. The vehicle seat back according to claim 1, wherein the seat back frame is provided on a rear side member supporting the supporting means, and is arranged on the front side with respect to the rear side member, and is arranged in the front-rear direction. A vehicle seat back comprising a front member which can be fixedly installed at an appropriate position. 3. The vehicle seat back according to claim 1 or 2, wherein the front member and / or the rear member has an upper end portion of the supporting means supported via a holder bracket. A seat back for an automobile, which is characterized by that. 4. The vehicle seat back according to claim 1, wherein the front member and the rear member form a through hole through which an upper end portion of the supporting means penetrates. An automobile seat back characterized by the following.