JP3487766B2 - 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,
A seat back frame (9), a support means (5) supported by the upper end of the seat back frame (9) so as to be rotatable back and forth, and a stay (27) at the upper end of the support means (5). ), A headrest (4) movably supported up and down, a pressure receiving member (10) supported by the lower end of the supporting means (5) and capable of receiving pressure on the back of an occupant, and the seat. The back frame (9) and the pressure receiving member (10) are each rotatably supported by an operation link (12) and a pad arranged in front of the pressure receiving member (10). .

Therefore, for example, when the 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 that time, the pressure receiving member (10) is moved to the rear side, so that the supporting means (5) is rotated around the upper side portion (24) of the seat back frame (9) as a rotation fulcrum and is supported on the upper end portion thereof. The removed headrest (4) 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, the pressure receiving member (10) is
Since it is made of cloth, there is a possibility that a rubbing noise between the cloth and the pad may occur, and improvement in riding comfort is required.

Further, since the pressure receiving member (10) is made of cloth, the amount of bending of the pressure receiving member (10) itself increases, and the load to the rear side of the occupant may not be surely transmitted, so that the headrest (4) is not moved. As it becomes slower and the amount of operation decreases, improvement is required.

The present invention has been made by paying attention to such a conventional technique, and even if a load from the occupant in the rearward direction is applied to the pressure receiving member, a rubbing noise with the pad does not occur, and the pressure receiving member can be securely operated. The present invention provides a vehicle seat back capable of ensuring the operation amount of the headrest.

[0008]

According to a first aspect of the present invention, there is provided a seatback frame, a support means supported by an upper end portion of the seatback frame so as to be rotatable back and forth, and the support means. A headrest supported on an upper end portion, a pressure receiving member supported on a lower end portion of the supporting means and capable of receiving pressure on an occupant's back, and the seat back frame side portion and the pressure receiving member side portion are rotatable. And at least a pad arranged on the front side of the pressure receiving member. The pressure receiving member is formed of a rigid body, the cross section of which is formed in a substantially U-shape with the front side open .
It is separated from the rear surface of the pad.

The invention according to claim 2 is the vehicle seat back according to claim 1, wherein the cross section of the pressure receiving member is at the rearmost position moved by the pressure of the back of the occupant. It is formed in a shape that does not interfere with the side portions of the frame.

A third aspect of the present invention is the vehicle seat back according to the first or second aspect, wherein the upper end of the pressure receiving member has an inclined surface portion that is slidable on the surface of the pad. 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, a pad (not shown) formed of polyurethane foam or the like arranged in front of and behind the seat back frame 2, and a skin such as a cloth covering the pad. At least formed.

The seatback frame 2 is formed in an inverted U shape, and one is long and the other is short (to secure a mounting margin of an airbag device (not shown)), and the upper frame 2a. Side frames 2b and 2b 'having a substantially left-right symmetrical shape, which are arranged at positions hanging down from the left and right ends of the frame 2a, and the side frames 2
b, 2b 'and an underframe 2c that is installed between the lower ends of the frames.

On each of the side frames 2b, 2b ', there is supported a bracket 5, 5'made of an iron plate in a plate shape. Each of the brackets 5 and 5'includes one end portion 6a and 6a 'of the operating link 6 and 6'.
However, front and rear FR, RR by bolt 20 and bush 21
Each is supported so that it can rotate in any direction.
Between the other ends 6b and 6b 'of the operation links 6 and 6', ends 4a and 4a 'of the pressure receiving member 4, which will be described later, are rotatably supported by rivets 22 and bushes 21.

Coil-shaped springs 18, 18 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 'are constantly urged toward the front FR.

The pressure-receiving member 4 is formed by a rigid body such as an iron plate and extends in the left-right direction and is formed in a rectangular shape. The cross-section of the pressure-receiving member 4 is, as shown in FIG. A flat central portion 4a (which is flat in the front and rear direction) supported by gas welding and a front board of the backboard trim brackets 29, 29 'supported by the side frames 2b, 2b' Flat first side portions arranged on the front side FR from the central portion 4a via the first step portions 4b, 4b 'formed in a slope shape so as not to interfere with the formed flanges 29a, 29a'. 4c, 4c 'and the side frame 2
b, 2b 'is formed so as to protrude toward the front side FR through second step portions 4d, 4d' formed in a slope so as not to interfere with flanges 2ba, 2ba 'formed so as to protrude toward the front side. Flange-shaped second side portions 4e, 4
e'is formed in a substantially U shape and is separated from the rear surface of the pad.

That is, the shape of the cross section of the pressure receiving member 4 is the rearmost position moved by the pressure of the back 30a of the occupant 30, and as shown in FIG. 4, the side frame which is the side portion of the seat back frame 2. 2b, 2b 'and the backboard trim brackets 29, 29' are formed so as not to interfere with each other.

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

On the back surface side of the pressure receiving member 4, a protector 31 made of synthetic resin, which is formed in a shape covering the entire back surface of the pressure receiving member 4, is arranged at a distance.
The clip 31a is engaged with and supported by an opening (not shown) formed in the pressure receiving member 4. The protector 31
Is formed so that the pressure receiving member 4 can withstand a load from the rear side RR, for example, a load of a rear seat occupant kicking a front side seat, that is, a rear side surface of the self seat. Further, the protector 31 has a vertical cross-sectional shape in which the upper end is flanged up toward the pressure receiving member 4, the outline is formed along the pressure receiving member 4, and the lower end is formed into a curved surface.

On the lower side of the upper frame 2a, a second frame 28 which is erected between the shoulder portions 2aa and 2aa 'of the upper frame 2a is supported by welding.
A holder bracket 12 is arranged at the center of the second frame 28, and both ends 12a, 12a thereof are supported by welding. The armature holders 11, 11 made of synthetic resin are provided inside the support portions 12b, 12b which are formed in a U-shape in a transverse cross section and which protrude toward the front side at positions left and right apart from the central portion of the holder bracket 12. Will be distributed. 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 parts 8, 8 of the armature pipe 7 are
Will be retained.

The armature pipe 7 is substantially U-shaped when viewed from the front, and is composed of vertical holding portions 8 and 8 which are juxtaposed side by side and a folding portion 10 formed at the lower ends of the holding portions 8 and 8. It is formed in.

The holding parts 8 and 8 are arranged at the center side of at least the shoulder point of the AF05% tile manikin (SAE) in a front view. The AF05% tile mannequin (SAE) is arranged on the center side of the shoulder points, which means that the holding portions 8 are arranged on the inner side of the shoulder points of most occupants 30 of adult physique. Therefore, even if the occupant 30 receives a load from the front side of the seatback 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 and 8 are formed in a dogleg shape in front and back so that the pressure receiving member 4 is arranged in front of the holding members 8 and 8 in a side view shown in FIG. It will be done.
The bent portion 8a is formed at a position close to the lower end portion of the stay 13 of the headrest 3, and the inner surface thereof is a curved surface having a radius of 20 mm.

Further, as described above, stays 13, 13 of the headrest 3 are slidably supported in the holding portions 8, 8 through the armature holders 11, 11 made of synthetic resin. . Headrest holders 14 and 14 capable of controlling the upper and lower positions of the stays 13 and 13 are held on the upper ends of the holding portions 8 and 8. Reference numeral 14a (not shown) indicates the headrest holders 14, 14
The reference numeral 15 is a frame of the headrest 3.

Reference numeral 16 indicates the side frames 2b, 2
It is an S-shaped spring supported by b'via hooks 17 and 17 'and arranged at a position below the pressure receiving member 4.

An opening 19 is formed on 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, 14. This is a structure in which an engaging portion (not shown) is pushed to disengage from the opening portion 19 and can be removed from the holding portions 8 and 8. That is, the headrest holders 14, 1
Lock-off of 4 is possible.

Reference numeral 24 is a stopper rubber, and 25 is a backboard hooking frame.

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 against the back, a slight gap A is formed between the head 30b 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 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, and its transverse cross section is formed in a substantially U shape and is separated from the rear surface of the pad.
The presence of the pressure receiving member 4 is not given through the pad until a load of 0 in the rear RR direction is generated. That is, the occupant 30 does not feel a foreign body.

On the rear surface of the pressure receiving member 4, the pressure receiving member 4
Protector 31 capable of withstanding the load from the rear RR,
Since the pressure receiving member 4 is arranged separately from the pressure receiving member 4, the pressure receiving member 4 cannot be moved to the front side FR even if a load from the rear RR by a passenger in the rear seat occurs. That is, the safety of the occupant in the seat is further ensured.

Further, even if the headrest 3 is moved to the front side FR, that is, the pressure receiving member 4 is moved to the rear side RR, the holding portions 8, 8 of the armature pipe 7 of the headrest 3 respectively project to the rear side RR. Is hindered. That is, the safety of the rear seat occupants 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 it is easy to tune to the load from the rear side RR. That is, the distance between the two can be widened or narrowed depending on the load value.

The protector 31 has a vertical cross-sectional shape which is formed along the pressure receiving member 4 and has a lower end portion which is curved, so that the holding portion 8 of the armature pipe 7 of the headrest 3 is formed. , 8 lower end is rear side R
Even if it projects to R, the lower end portion is formed into a curved surface, so that the safety of the rear seat occupant is further maintained.

When the vehicle 30 is rear-end hit and the seated occupant 30 is pushed to the rear RR by the secondary collision and the pad or the like of the seat back 1 moves to the rear RR, the occupant's back 3
0a pushes the pressure receiving member 4 to the rear side RR via a pad or the like. Even if the pad or the like moves rearward due to the load in the rear RR direction by the occupant 30, the pressure receiving member 4 that receives the load is a rigid body, so that no rub noise with the pad is generated and the back of the occupant 30 is not generated. The load in the rear RR direction by 30a is reliably transmitted to the headrest 3. That is, since the headrest 3 moves immediately when a load is applied to the pressure receiving member 4, there is no timing loss. Further, the movement amount of the pressure receiving member 4 becomes large.

Then, with respect to the movement of the holding portion 8 of the armature pipe 7 which is rotated with respect to the load on the rear side RR to move to the upper side UP, the load point of the pad arranged at the opposite position is Since the shoulder point is at least the AF05% tile manikin, the pad or the like does 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.

Further, since the pressure receiving member 4 is composed of a rigid body such as an iron plate, the load of the occupant 30 in the rear RR direction is reliably transmitted to the holding portion 8. That is, since the headrest 3 moves immediately when a load is applied to the pressure receiving member 4, there is no timing loss. Also, the pressure receiving member 4
The amount of movement will increase.

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 portion of the armature pipe 7, that is, the folded portion 10 moves to the upper side UP and the rear side RR. Along with the movement, the upper end portion of the armature pipe 7, that is, the upper end portions 8b and 8b of the holding portions 8 and 8.
At the same time, the headrest holders 14, 14 move to the upper side UP and the front side FR. By the movement, the stay 13 of the headrest 3 is also moved to the upper side UP and the front side FR.

Therefore, the holders 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 portion 30b of the occupant 30, as shown in FIG. In addition, in FIG. 5, the headrest 3 is illustrated as biting into the head 30 b of the occupant 30, but the headrest 3 has a recessed center, and the head 30 of the occupant 30 is illustrated.
As is well known, b also has a substantially columnar cross section, and therefore does not bite into it.

Thus, the upper half of the occupant 30 is rear-side 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. In other words, it is difficult for the pressure receiving member 4 to bite into the pad.

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.
Of the seat back frame 2 when the pressure receiving member 4 moves to the rear side RR, the side frames 2b, 2b 'and the backboard trim brackets 29, 29' which are side portions of the seat back frame 2 are not interfered with each other. It does not interfere with the side frames 2b, 2b 'which are parts.

Further, since the holding portion 8 is formed in a V-shape in front and rear with respect to the pressure receiving member 4 and the rear surface of the folding portion 10 is covered by the protector 31, the pressure receiving member 8 is received. As shown in FIG. 5, when the member 4 moves to the rear side RR, the pressure receiving member 4 and the folded portion 1
0 does not project to the rear RR.

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

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 portion 30b of the occupant 30.

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.

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

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.

[0050]

According to the first aspect of the present invention, the pressure receiving member is formed of a rigid body, and its cross section is formed in a substantially U-shape and is separated from the rear surface of the pad. Therefore, the presence of the pressure receiving member is not given through the pad until the load in the rearward direction is generated by the occupant. That is, it does not give a foreign body feeling.

When the pad is pushed rearward by the occupant's back and moves, the pressure receiving member that receives the load is a rigid body, so that no rub noise with the pad is generated and the occupant's back does not rub. The load in the direction is reliably transmitted to the headrest. That is, the movement of the headrest
There is no timing loss because it moves immediately when a load is applied to the pressure receiving member. Further, the amount of movement of the pressure receiving member becomes large.

According to the second aspect of the invention, the cross section of the pressure receiving member is formed in a shape that does not interfere with the side portion of the seat back frame at the rearmost position moved by the pressure of the back of the occupant. Therefore, when the pressure receiving member moves rearward, it does not interfere with the side portion of the seatback frame.

According to the third aspect of the present invention, the slope of the pressure receiving member is formed on the upper end of the pressure receiving member so that it can slide on the surface of the pad. I am doing well.

[Brief description of 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.

FIG. 4 is a sectional view taken along the line SA-SA in 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 2b Side frame of seat back frame 3 headrest 4 Pressure receiving member 6 working links 6a One end of actuation link 6b The other end of the working link 7 Armature pipe as support means 8 Armature pipe holder 10 Armature pipe turns 13 Headrest stay 29 Backboard trim bracket 30 crew 30a Crew's back 30b Crew head 31 protector FR front side RR behind UP upper side LWR lower side

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-10-181402 (JP, A) JP-A-10-181401 (JP, A) JP-A-10-119619 (JP, A) JP-A-10- 6832 (JP, A) Jitsukaihei 7-1842 (JP, U) European Patent Application Publication 627340 (EP, A 1) International Publication 98/9838 (WO, A1) (58) Fields investigated (Int.Cl. ⁷⁾ , DB name) B60N 2/00-2/72 A47C 7/36

Claims (3)

(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, a headrest supported by an upper end portion of the support means, and the support means. A pressure receiving member that is supported by the lower end of the
A vehicle seat back comprising at least an operation link in which the seat back frame side portion and the pressure receiving member side portion are rotatably connected to each other, and a pad arranged on the front side of the pressure receiving member, The seat back for an automobile, wherein the pressure receiving member is formed of a rigid body, and a cross section thereof is formed in a substantially U shape with the front surface side being open, and is separated from the rear surface of the pad. 2. The vehicle seat back according to claim 1, wherein a cross section of the pressure receiving member has a shape that does not interfere with a side portion of the seat back frame at a rearmost position moved by pressure on a back of an occupant. A seat back for an automobile, characterized in that 3. The automobile seat back according to claim 1 or 2, wherein an inclined surface portion capable of sliding on a surface of the pad is formed at an upper end portion of the pressure receiving member. And a car seat back.