JP2002225610A - Automotive seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and inexpensively manufacture a seat with a headrest which moves forward when suffering a rear end collision. SOLUTION: An oscillating assembly 20 is supported on a support pipe 13a at an upper edge part of an inner frame 10 of a backrest to be capable of oscillating, it is energized forward by a spring 30, and it is locked to a stopper 35. The oscillating assembly 20 comprises a first bracket 21, a second bracket 22, a load bearing member 23, and a pair of vertical pipes 24. The first bracket 21 comprises an arc part 21a in contact with an outer circumferential surface of the support pipe 13a, an upper plate part 21b, and a hanging plate part 21c. The vertical pipe 24 is extended upward from the load bearing member 23 to penetrate the upper plate part 21b of the first bracket 21 to get in contact with the support pipe 13a. The vertical pipe 24 is connected through the second bracket 22 to the hanging plate part 21c of the first bracket 21, and a stay 4a of the headrest 4 is inserted in an upper end opening of the pipe 24 to be supported.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat having a structure in which a headrest moves forward during a rear-end collision.

[0002]

2. Description of the Related Art When an automobile is hit, the seat is pushed forward with a strong force together with the vehicle body. At this time, the occupant is pushed forward by the seat, but the occupant's head relatively moves rearward due to inertia, causing a so-called whiplash obstacle. In order to prevent such a whiplash failure, a headrest is provided on the backrest so as to prevent the occupant's head from moving significantly backward. However, the headrest at the fixed position with respect to the backrest could not sufficiently prevent the occupant's head from falling backward.

[0003] Japanese Patent No. 2,914,948 discloses an apparatus for effectively suppressing whiplash failure. In this device, a pair of left and right stays from a headrest extend downward and are accommodated in a backrest, and a wave spring is stretched between lower ends of these stays. These stays are swingably supported by a support pipe constituting the upper edge of the inner frame of the backrest. More specifically, brackets having circular through holes are fixed to these stays, respectively, and the support pipe passes through the through holes of these brackets.

[0004] In the vehicle seat disclosed in the above publication, when the vehicle is collided, the wave springs spanning the pair of stays receive the load of the occupant and rotate the stays. Then
The headrest supported by the stay moves forward, thereby effectively preventing the occupant's head from falling backward.

[0005]

However, in the above-described apparatus, since the stay of the headrest is extended to the inside of the backrest, the headrest must be assembled during the assembly process of the backrest, and the assembly of the seat is complicated.
Further, the support pipe is bent while the bracket for supporting the stay so as to be swingable is attached to the support pipe of the inner frame of the backrest, and the processing is complicated. There is a disadvantage that the manufacturing cost is increased due to such complicated processing and assembly.

[0006] In the seat of the above publication, the lower end of the stay is held by a zigzag strip or bar, and the stay is held in a predetermined position when no load exceeding a predetermined value is received from the occupant. Eventually, the headrest is held at a predetermined position, but such a holding means causes an increase in manufacturing cost and is not practical.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide an automobile seat which can effectively prevent whiplash and has a low manufacturing cost in order to solve the above-mentioned problems.

[0008] The automobile seat of the present invention has (a) a backrest having an inner frame, the upper edge of which forms a support pipe having a circular cross section; and (ii) a backrest housed in the backrest. (C) a swing assembly supported swingably around the support pipe, and (c) spanned between the swing assembly and the inner frame of the backrest;
A spring for urging the swing assembly forward; and (d) the swing assembly is fixed to the inner frame of the backrest, and the swing assembly is locked to a predetermined position by locking the swing assembly against the spring. And a stopper for holding the headrest at a predetermined position, and (e) a headrest having a pair of left and right stays extending downward and supported by the swing assembly via the stays, The swing assembly includes: (a) an arc portion in contact with the outer peripheral surface of the support pipe, an upper plate portion substantially continuous with an upper edge of the arc portion, and a drooping shape connected to a lower edge of the arc portion; (B) a load receiving member that receives a load of an occupant when the vehicle is hit by a rear end, and (c) a first bracket that extends upward while being fixed to the load receiving member. When penetrating the upper plate part In contact with the outer peripheral surface of the support pipe,
A pair of left and right vertical pipes for inserting and supporting the pair of stays of the headrest from the upper end opening, respectively, and (d) a second bracket fixed to the pair of vertical pipes;
(E) connecting means for connecting the second bracket to the hanging plate portion of the first bracket with the support pipe sandwiched between the pair of vertical pipes and the arc portion of the first bracket. Features.

Preferably, the connecting means for connecting the first and second brackets comprises a bolt and a nut. More preferably, the first bracket extends along the support pipe, the second bracket extends along the support pipe in an upright plate shape, and the load receiving member forms an upright plate shape. The pair of vertical pipes extends parallel to the support pipe and is welded to the second bracket and the load receiving member. More preferably, the stopper extends along the support pipe in an upright plate shape, an arc portion of the first bracket contacts an outer peripheral surface on a rear side of the support pipe, and an upper plate portion of the first bracket extends forward from the arc portion. , The hanging plate portion of the first bracket, the vertical pipe,
The second bracket and the stopper are arranged in order from the rear to the front, and the second bracket has a pair of left and right receiving portions having a circular arc cross section for receiving and fixing the vertical pipe. The bracket has a pair of left and right storage sections for storing a pair of storage sections of the bracket.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 5, the automobile seat includes a seat cushion 1, a backrest 3 connected to the seat cushion 1 via an adjuster 2, and a headrest 4 provided on an upper portion of the backrest 3. I have.

As shown in FIG. 3, the backrest 3 has a substantially rectangular inner frame 10. The inner frame 10 includes left and right side plates 11 and these side plates 1.
1 has a horizontal pipe 12 connected between lower ends thereof, and a pipe 13 connected between upper ends of these side plates 11. The pipe 13 has a circular cross section, and has a left and right end bent to form an inverted U-shape. The horizontal part thereof is provided as a support pipe 13 a constituting the upper edge of the inner frame 10. Further, a wave spring 15 is stretched between intermediate portions of the side plates 11 of the inner frame 10.
These internal frame 10 and wave spring 15
It is covered with a cover 16 including a cushion material.

The vehicle seat of the present invention further includes a swing assembly 20 housed in the backrest 3.
As shown in FIGS. 1 and 3, the swing assembly 20 is disposed at a height substantially intermediate between the first bracket 21 and the second bracket 22 disposed near the support pipe 13 a and the backrest 3. It includes a load receiving plate 23 (a load receiving member), a pair of left and right vertical pipes 24, and a reinforcing wire 25 laid around an intermediate portion of the vertical pipes 24.

The first bracket 21 extends horizontally along the support pipe 13a as shown in FIG. 3, and as shown in FIG.
1a, an upper plate portion 21b extending substantially horizontally forward from the upper end of the arc portion 21a, and a hanging plate portion 21c extending downward from the lower end of the arc portion 21a. A pair of left and right through holes 21x (only one is shown in FIG. 1) are formed in the upper plate portion 21a.

The load receiving plate 23 is elongated horizontally and has an upright plate shape. Each vertical pipe 24
Has a long pipe 24a extending substantially vertically, and a short pipe 24b inserted into the upper end thereof and fixed by welding or the like. The lower end of the long tube 24a is crushed and fixed to the back of the left and right portions of the load receiving plate 23 by welding or the like.
The short pipe 24b serving as the upper end of the vertical pipe 24 is inserted into the through hole 21x of the upper plate 21a of the first bracket 21.

The second bracket 22 supports the support pipe 1.
It extends horizontally along 3a, has the same length as the first bracket 21, and has an upright plate shape. The second bracket 22 is arranged in front of the first bracket 21 and the vertical pipe 24. Second bracket 22
Has a pair of right and left accommodating portions 22a projecting forward and having a circular cross section, as best shown in FIG. The upper end of the long tube 24a is fitted into the housing portion 22a and is fixed by welding or the like.

As shown in FIG. 4, the second bracket 2
2 is fixed to the hanging plate portion 21c of the first bracket 21 by a pair of left and right connecting means 29 including a bolt 29a and a nut 29b. In a fixed state of the two brackets 21 and 22, the short pipe 24b of the vertical pipe 24 is in contact with the front outer peripheral surface of the support pipe 13a. The swing assembly 20 is swingably supported by the support pipe 13a by the arcuate portion 21a of the first bracket 21 and the short pipe 24b contacting the outer peripheral surface of the support pipe 13a so as to sandwich the support pipe 13a. A cushioning material 26 such as rubber is attached to the front surfaces of the left and right ends of the second bracket 22.

As shown in FIGS. 1 and 3, the vertical pipe 2
A bush 27 is inserted into and fixed to the upper end opening of the short pipe 24b of the fourth tube 4. A pair of left and right stays 4a extending downward from the headrest 4 are inserted and supported by the bush 27 so that they cannot be removed. Thereby, the headrest 4 can swing together with the swing assembly 20.

Between the lower end of the swinging assembly 20, that is, the left and right ends of the load receiving plate 23 and the left and right side plates 11 of the inner frame 10 of the backrest 3, coil springs 30 in tension are respectively wound. ing. The spring 30 urges the swing assembly 20 in the clockwise direction in FIG.

A stopper plate 35 (stopper) is fixed to the support pipe 13a by welding or the like.
The stopper plate 35 extends along the support pipe 13a and is in an upright state, and has a pair of right and left accommodating portions 35a projecting forward and having an arc-shaped cross section.

The second bracket 22 of the swing assembly 20 urged forward by the spring 30 has a cushioning material 26.
, The swinging assembly 20 is held at a predetermined position, and thus the headrest 4 is held at a predetermined position.

When the second bracket 22 is locked by the stopper plate 35, the receiving portion 22 a of the second bracket 22 is received in the receiving portion 35 a of the stopper plate 35.

The assembly of the vehicle seat having the above configuration will be briefly described. The inner frame 10 is prepared by welding the side plate 11 and the pipes 12 and 13. The stopper plate 35 is welded to the inner frame 10. On the other hand, the load receiving plate 23 and the vertical pipe 2
4, the auxiliary wire 25 and the second bracket 22 are welded,
An assembly that forms a main part of the swing assembly 20 is prepared.

Next, the arc portion 21a of the first bracket 21
The upper end of the vertical pipe 24 of the above assembly and the second bracket 22
Is inserted between the stopper plate 35 and the hanging plate portion 21c of the first bracket 21, and the short pipe 2 of the vertical pipe 24 is inserted.
4b is inserted into the through hole 21 of the upper plate 21b of the first bracket 21.
Insert at x. Then, the second bracket 22 is connected to the hanging plate portion 21c of the first bracket 21 by the bolt 29a and the nut 29b. Thus, the swing assembly 2
0 is assembled and swingably attached to the support pipe 13a. Thereafter, the spring 30 is attached between the load receiving plate 23 and the side plate 14, and the bush 27 is inserted and fixed in the short tube 24b.

As described above, the swing assembly 20 can be assembled in a step different from that of the headrest 4, and in the final assembly step of the swing assembly 20, the swing assembly 20 is connected to the support pipe 13a. , The manufacturing cost can be reduced.

Next, the operation of the automobile seat will be described. When the vehicle is hit, the seat is pushed forward with strong force together with the vehicle body. At this time, the occupant is pushed forward by the seat, but the occupant's head tends to move relatively rearward due to inertia. In the seat of the present invention, when the seat is pushed forward and the backrest 3 pushes the back of the occupant, in other words, the backrest 3
When a load is applied, the load is received by the load receiving plate 23 of the swing assembly 20. As a result, as shown in FIG.
, The headrest 4 supported by the swing assembly 20 moves forward. As a result, the head of the occupant trying to move backward can be suppressed,
An occupant's whiplash failure can be effectively suppressed.

It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately changed. For example, a pair of left and right second brackets may be provided, and a pair of vertical pipes may be respectively connected to the first bracket via the second bracket. Also, a buffer may be attached to the front surface of the housing of the second bracket, and the buffer may be used to contact the housing of the stopper plate.

[0027]

As described above, according to the present invention,
Since the support pipe is sandwiched between the first bracket and the vertical pipe at the upper end of the swing assembly in order to rotatably support the swing assembly on the support pipe of the lockrest, a rotary support structure can be easily obtained. Further, since the stay of the headrest is inserted and supported by the vertical pipe, the swing assembly can be assembled independently of the headrest. Thereby, the manufacturing cost can be reduced. Also, the arc portion of the first bracket is brought into contact with the outer peripheral surface of the support pipe, and the vertical pipe penetrates the upper plate portion of the first bracket, and is connected to the hanging plate portion of the first bracket via the second bracket. As a result, assembly can be performed more easily and reliably. Moreover, by using the spring and the stopper, the headrest can be reliably held at a predetermined position in the normal state, and the configuration for that purpose is also inexpensive.

Further, by connecting the second bracket and the first bracket with bolts and nuts, this connection work is completed at the end of the work of assembling the swing assembly and the work of attaching the swing assembly to the support pipe. And the workability can be further improved.

Further, if the second bracket, the load receiving plate, and the pair of vertical pipes are welded to each other, a main part of a strong swing assembly can be constructed, and the assembly obtained by this welding can be used. , First with the above bolts and nuts
The work of connecting to the bracket can be performed more easily. Further, the vertical pipe is housed and fixed in the accommodating portion having the arcuate cross section of the second bracket, whereby the second bracket and the vertical pipe are firmly fixed. Further, by accommodating the accommodating portion of the second bracket in the accommodating portion having the arc-shaped cross section of the stopper, it is possible to save space and to obtain a stable locked state of the swing assembly.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing a normal state of a backrest of an automobile seat according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a main part of the backrest when a vehicle is hit by a rear end;

FIG. 3 is a front view of the backrest.

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

FIG. 5 is a schematic side view of the vehicle seat.

[Explanation of symbols]

 Reference Signs List 3 backrest 4 headrest 4a stay 10 inner frame 13a support pipe (upper edge of inner frame) 20 swing assembly 21 first bracket 21a arc portion 21b upper plate portion 21c hanging plate portion 21x through hole 22 second bracket 22a accommodation Part 23 Load receiving plate (load receiving member) 24 Vertical pipe 24b Short pipe (upper end of vertical pipe) 29 Connecting means 29a Bolt 29b Nut 30 Spring 35 Stopper plate (Stopper)

Claims (4)

[Claims] 1. A backrest having an inner frame, the upper edge of which forms a support pipe having a circular cross section, and (b) a backrest housed in the backrest and centered on the support pipe of the inner frame. A swing assembly supported so as to be swingable, and (c) a spring that is bridged between the swing assembly and the inner frame of the backrest and biases the swing assembly forward. (D) holding the swinging assembly at a predetermined position by being fixed to the inner frame of the backrest and locking the swinging assembly against the spring;
And a stopper for holding the headrest at a predetermined position, and (e) a headrest having a pair of left and right stays extending downward and supported by the swing assembly via the stays. (A) an arc portion in contact with the outer peripheral surface of the support pipe, an upper plate portion substantially continuous with the upper edge of the arc portion, and a drooping plate portion hanging down from the lower edge of the arc portion A first bracket having: (b) a load receiving member that receives a load of an occupant when the vehicle is collided; (c) a first bracket that is fixed to the load receiving member and extends upward;
A pair of left and right vertical pipes that penetrate the upper plate portion of the bracket and are in contact with the outer peripheral surface of the support pipe, and insert and support a pair of stays of the headrest from upper end openings, (E) connecting the second bracket to the hanging plate portion of the first bracket while the support pipe is sandwiched between the pair of vertical pipes and the arc portion of the first bracket. An automobile seat comprising: connecting means; 2. The vehicle seat according to claim 1, wherein the connecting means for connecting the first and second brackets comprises a bolt and a nut. 3. The first bracket extends along the support pipe, the second bracket extends along the support pipe in an upright plate shape, and the load receiving member has an upright plate shape. 3. The system according to claim 2, wherein said pair of vertical pipes extend parallel to said support pipe and are welded to said second bracket and said load receiving member.
2. The automotive seat according to claim 1. 4. The stopper has an upright plate shape and extends along the support pipe, an arc portion of the first bracket contacts an outer peripheral surface on a rear side of the support pipe, and an upper plate portion of the first bracket extends from the arc portion. The hanging plate portion of the first bracket, the vertical pipe, the second bracket, and the stopper are arranged in order from the rear to the front, and the second bracket accommodates and fixes the vertical pipe. It has a pair of left and right accommodation parts, and the stopper also has
The vehicle seat according to claim 3, further comprising a pair of left and right storage portions that store the pair of storage portions of the second bracket.