JP3201591B2 - Vehicle seat - 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 provided with a headrest, and more particularly, to a load receiving member having a headrest installed at an upper edge of a seatback and receiving an impact in the seatback, and an impact of a predetermined value or more. The present invention relates to a vehicle seat in which a stress transmission mechanism which operates when a load is applied to a load receiving member is installed, and a headrest is raised by an operation of the stress transmission mechanism, and a headrest of an occupant is received and protected by an impact in the event of an impact.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 11, a vehicle seat 1 has a seat back 4 attached to a seat cushion 2 via an adjuster mechanism 3 so as to be tiltable. A headrest 5 for protecting the head is provided on the edge. And recently, in order to further reduce whiplash at the time of rear-end collision etc., when receiving an impact load at the time of rear-end collision etc., the headrest automatically rises to protect the occupant's head, For example, JP-A-7-291005, U.S. Pat.
No. 43, etc.

[0003] As shown in FIG. 12, a vehicle seat of this type in which a headrest automatically rises is provided with a seat back 4.
A load receiving member 6 for receiving an impact load at the time of a rear-end collision is disposed therein, and two link arms 7a and 7b constituting a link mechanism 7 are rotatably supported by a frame 4a of the seat back 4. The load receiving member 6 is connected to one of the link arms 7b, and a holder 8 that supports the stay 5a of the headrest 5 is fixed to the upper end of the link arm 7b.

Accordingly, the link arms 7a and 7b are normally locked by the spring force of a coil spring (not shown). However, when the vehicle receives a rear-end collision, the occupant's body is pressed against the load receiving member 6 from the seat back 4. When the pressing force exceeds the spring force of the coil spring, the load receiving member 6 moves rearward, and at the same time, the link arm 7a,
As a result, the headrest 5 is lifted upward, receives the head of the occupant, and prevents a large impact from being applied to the occupant's head during a rear-end collision.

[0005] The structure of the seat back 4 in which the load receiving member 6 and the link mechanism 7 are disposed is to cover an S-shaped spring and the seat back frame 4a in order to ensure good cushioning when the occupant is seated. The pad material 9 of the seat back 4 is provided. As shown in FIGS. 13 and 14, the pad material 9 of the seat back 4 is lined with a reinforcing material 10 such as a nonwoven fabric on the back surface and a cross material on the front surface side. And the like.

[0006]

As described above, in a vehicle seat provided with a headrest, the load receiving member 6 and the link mechanism 7 are provided inside the seatback 4, and at the time of a rear-end collision, the headrest 5 is raised to raise the occupant's head. In the vehicle seat 1 which protects a portion and reduces whipping, the side pad material 9a of the pad material 9 of the seat back 4 is fixed to the seat back frame 4a, and the side pad material 9a and the center pad material are provided. 9b is an integral structure,
In a rear-end collision, the center pad material 9b is supported by the side pad material 9a, the amount of deflection of the center pad material 9b pressing the load receiving member 6 is limited, the movement amount of the load receiving member 6 is small, and the rising stroke of the headrest 5 is reduced. It was pointed out that it was not possible to secure a lot.

Further, the seat back 4 is inclined backward by the acceleration of the entire seat due to the impact at the time of a rear-end collision and the inertia of the occupant, and the occupant's body floats obliquely upward. Friction occurs between the member 10 and the link mechanism 7, and the load at the time of collision is not effectively transmitted to the link mechanism 7, which also hinders a smooth lifting operation of the headrest 5.

The present invention has been made in view of such circumstances, and when a vehicle receives an impact load during a rear-end collision or the like, the load applied by the occupant is effectively applied to a stress transmission mechanism such as a link mechanism inside the seat back. The present invention aims to provide a vehicle seat with improved safety that can smoothly perform an ascending operation with a large amount of movement of a headrest and reduce whispering of an occupant.

[0009]

According to a first aspect of the present invention, there is provided a vehicle seat having a headrest provided on an upper edge of a seatback, a load receiving member receiving an impact in the seatback, and a predetermined position. A stress transmission mechanism that operates when an impact load greater than the value is applied to the load receiving member is installed,
In the vehicle seat in which the headrest is raised by the operation of the stress transmission mechanism and the occupant's head is received and protected by the headrest in the event of an impact, the pad material of the seat back is composed of a side pad material fixed to the seat back frame and a center. The pad material is divided through a slit, and the center pad material is further divided into two parts vertically through the slit, ensuring the amount of sinking of the upper part of the center pad material to effectively apply impact to the load receiving member. It is characterized in that it is transmitted.

According to a second aspect of the present invention, the slit for vertically dividing the center pad material into two in the pad material of the seat back is cut so as to be inclined downward toward the rear. Features.

According to a third aspect of the present invention, there is provided a vehicle seat wherein a curved connecting member or a sheet-shaped member is provided between the pad members facing each other along a slit which vertically divides a center pad material in the pad material of the seat back into upper and lower parts. The center pad material is connected by an elastic member to give a sense of continuity.

Therefore, according to the first aspect of the present invention,
As for the pad material of the seat back, the main pad material has a divided structure through the side pad material fixed to the seat back frame and the slit, and the main pad material has a two-divided structure through the slit up and down. When a load is applied, the upper part of the center pad material, which becomes the impact area, easily sinks rearward, and can effectively transmit the impact to the load receiving member installed inside its inner surface side, via the stress transmission mechanism The headrest can be raised smoothly by a predetermined stroke.

Further, according to the second aspect of the invention, it is possible to secure a sufficient amount of movement of the load receiving member at the time of a rear-end collision, and to guarantee a smooth rise of the headrest.
The slit that divides the center pad material into upper and lower parts is formed in a diagonally cut shape so that it slopes downward toward the rear, so that the continuity of the seat back surface is secured and the occupant's back feels uncomfortable. I will not give.

Similarly, according to the third aspect of the present invention, the center pad material of the seat back pad material is vertically divided into two through slits, and the surface of the divided body is a curved connecting member, or Since the seats are stretched and stretched to give a sense of unity to the product surface, they do not give the occupant a sense of incongruity. The center pad material of the back pad material sinks enough,
The amount of movement of the load receiving member is ensured, and smooth operation of raising the headrest can be expected.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle seat according to the present invention will be described below with reference to the drawings. FIG. 1 is an external view of a vehicle seat showing one embodiment of the present invention, FIG. 2 is a vertical cross-sectional view showing the configuration of a seat back pad material and a headrest in the vehicle seat, and FIG. Front view, FIG. 4, FIG. 5 showing internal mechanism of seat back
FIG. 6 is a longitudinal sectional view and a transverse sectional view showing the structure of a pad material of a seat back of the vehicle seat. FIGS. 6 and 7 show a state where the headrest is raised at the time of a rear-end collision, and FIG. FIG. 7 is a sectional view showing the configuration of the seat back and the headrest. 8 to 10 are sectional views showing different embodiments of the pad material of the seat back applied to the vehicle seat according to the present invention.

In FIG. 1, a vehicle seat 20 is provided with a seat back 40 serving as a backrest via an adjuster mechanism 31 on a seat cushion 30 attached and fixed to a vehicle floor.
The seat back 40 is tiltably mounted.
A headrest 50 for protecting the occupant's head is installed on the upper edge of the vehicle.

Next, the seat back 4 will be described with reference to FIGS.
0 and the detailed configuration of the headrest 50 will be described. 3, the internal structure of the seat back 40 from which the pad material 42 is removed will be described for convenience of describing the internal mechanism of the seat back 40.

That is, the seat back 40 is constructed by enclosing a seat back frame 41 with a pad material 42 of the seat back 40, and a reinforcing material 43 such as a nonwoven fabric is provided on the back surface of the pad material 42 of the seat back 40. A trim cover 44 that is lined and has a good touch feeling such as a cloth is attached to the surface side of the pad material 42 of the seat back 40.

Further, the headrest 50 is formed with two stays 52 for supporting the headrest 50 integrally with an internal headrest frame 51, and the outer surface of the frame 51 has pad materials 53,
The headrest is covered with a skin material 54.

As a support structure for the headrest 50, brackets 45 are fixed to the upper right and left two portions of the upper edge of the seat back frame 41 of the seat back 40, and a pipe-shaped holder bracket 46 is supported by the bracket 45. A stay holder 47 is fitted and fixed in the holder bracket 46, and the stay 52 of the headrest 50 is inserted into a round hole of the stay holder 47 to support the headrest 50.

The vehicle seat 20 according to the present invention is configured such that the headrest 50 rises when an impact load is applied in order to reduce whiplash in a rear-end collision or the like.
Therefore, when a shock such as a rear-end collision is applied to the seat back 40, a link mechanism 60 is provided as a conversion mechanism that can transmit a stress that rises to the headrest 50 side.

Both sides 4 of the seat back frame 41
First link arms 61, 61 are rotatably mounted on the inner wall surface of the first link arm 61a, respectively, on pivot points 61a. The arms 62 are pivotally supported by connecting portions 62a, respectively.

The second link arms 62, 62
A load receiving member 63 is horizontally provided between the second link arms 62, 62. A lower end 46a of the holder bracket 46 for supporting the headrest 50 is connected to a connecting bar 64 provided in a bridge manner on the upper end side of the second link arm 62, by welding or the like. Is fixed.
Note that reference numeral 65 denotes an S-shaped spring that is bridged between the second link arms 61.

The link mechanism 60 operates when an impact load of a predetermined value or more is applied to the vehicle, such as when a rear-end collision occurs, but the first link arm 61 is normally operated so that the link mechanism 60 does not operate. , 61 to the fulcrum 61a, 61
2, a locking coil spring 66 for applying a pulling force in the clockwise direction in FIG. 2 is provided.

The operation of the link mechanism 60 will be described later, but the feature of the present invention is the configuration of the seat back 40 for smoothly operating the link mechanism 60. That is, the pad material 42 of the seat back 40 is the same as that of FIG.
As shown in FIG. 5, in order to effectively apply the impact at the time of a rear-end collision to the load receiving member 63, the center pad material 421 on the side facing the load receiving member 63 and the seat back frame 4
A slit 423 is formed between the side pad member 422 that is fixed to 1 and whose movement is restricted. The slit 423 guarantees the movement of the center pad material 421.

A slit 424 is provided in the horizontal direction to further divide the center pad material 421 into upper and lower parts. The reinforcing members 43 lined with the back surface of the pad material 42 of the seat back 40 also have respective slits 423 and 423.
424.

Accordingly, the vehicle seat 20 according to the present invention
In the normal state, when the occupant is seated, the link mechanism 60 is locked by the spring force of the coil spring 66, the link mechanism 60 does not operate, and the headrest 50 is stably supported.

When the vehicle is hit by a rear-end collision,
As shown in the figure, the upper body of the occupant is pressed rearward, and the center pad material 421 of the pad material 42 of the seat back 40 is pressed.
Is easily moved rearward by the slits 423 and 424 formed in the periphery, easily sinks rearward without being restricted by the seat back frame 41, and is easily sunk to the rear by collision with the load receiving member 63 of the link mechanism 60. The impact force can be transmitted effectively.

When the impact force applied to the load receiving member 63 exceeds the spring force of the coil spring 66, the first link arm 61, 61 and the second link arm 62, 62 are fixed to the connecting bar 64 by cooperative operation. By raising the holder bracket 46 and the headrest 50 supported by the holder bracket 46,
The headrest 50 is brought close to the occupant's head, so that the head does not shift above the headrest 50 during a rear-end collision, the occupant's head can be reliably received by the headrest 50, and whiplash can be effectively prevented.

The stress transmitting mechanism for transmitting the impact applied through the pad member 42 of the seat back 40 to the headrest 50 side may be replaced with a link mechanism 60 and a conventional mechanism such as a cam mechanism.

FIGS. 8 to 10 show modifications of the pad material 42 of the seat back 40 in the vehicle seat according to the present invention. FIG. 8 shows the center pad material of the pad material 42 of the seat back 40. When the 421 is divided into upper and lower parts, it is cut in an inclined manner by a slit 425 inclined downward toward the rear as shown in the figure.

By setting the inclined slit 425, when a relatively small impact, that is, an impact in which the link mechanism 60 does not operate is applied, a sense of unity is given to the product surface, and an uncomfortable feeling is given to the occupant's back. Absent.

Similarly, as shown in FIG. 9, the center pad material 421 is vertically divided by slits 424,
Even if the slits 424 are connected by a curved connecting member 426, the occupant does not feel uncomfortable on the surface of the seat back 40, and as shown in FIG. If the slits 424 are connected, no discomfort is imparted to the back of the occupant.

9 and 10, in the event of a rear-end collision, the connecting member 426 or the elastic sheet 427 extends, the center pad material 421 effectively sinks backward, and the headrest 50 rises. It does not hinder operation.

[0035]

As described above, according to the vehicle seat according to the first aspect, the headrest is installed at the upper edge of the seatback, the load receiving member receiving the impact in the seatback, and the impact load of the predetermined value or more. The headrest is raised by the operation of the stress transmission mechanism, and the headrest of the occupant is received and protected by the headrest in the event of an impact. The center pad material facing the member sinks effectively backward without being restricted by the seat back frame, and can effectively transmit the impact to the load receiving member. As a result, the operation of the stress transmission mechanism such as the link mechanism The headrest can be raised upward by a predetermined stroke with a large moving amount, and the head of the occupant can be It is possible to reliably receive I, there is an advantage that it is possible to effectively prevent whiplash injury.

Further, according to the vehicle seat according to the second and third aspects, the slit for dividing the center pad material into upper and lower portions is set to have an inclined shape which is inclined downward toward the rear.
Alternatively, if the pad material facing each other along the slit dividing the center pad material vertically is connected by a curved connecting member, or an elastic sheet, the continuity of the pad material can be emphasized against relatively small impact, As a result, it is possible to obtain an effect that the comfort at the time of sitting can be guaranteed without giving a feeling of discomfort to the back of the passenger.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view showing a configuration of a seat back and a headrest in the vehicle seat shown in FIG.

FIG. 3 is a front view showing a state where a pad material of a seat back of the vehicle seat shown in FIG. 1 is removed.

FIG. 4 is a longitudinal sectional view showing a pad material of a seat back in the vehicle seat shown in FIG. 1;

FIG. 5 is a cross-sectional view showing a pad material of a seat back in the vehicle seat shown in FIG. 1;

FIG. 6 is a front view showing a state in which the vehicle seat shown in FIG. 3 is in a rear-end collision.

FIG. 7 is a sectional view showing a state of the vehicle seat shown in FIG. 2 at the time of a rear-end collision;

FIG. 8 is a longitudinal sectional view showing a different aspect of the pad material of the seat back used for the vehicle seat according to the present invention.

FIG. 9 is a longitudinal sectional view showing still another aspect of the pad material of the seat back used for the vehicle seat according to the present invention.

FIG. 10 is a longitudinal sectional view showing still another aspect of the pad material of the seat back used for the vehicle seat according to the present invention.

FIG. 11 is an external view showing a conventional vehicle seat.

FIG. 12 is an explanatory diagram showing a conventional headrest configuration for whipping prevention.

FIG. 13 is a perspective view showing a pad material of a conventional seat back.

FIG. 14 is a sectional view taken along line XIV-XIV in FIG. 13;

[Explanation of symbols]

 Reference Signs List 20 vehicle seat 30 seat cushion 40 seat back 41 seat back frame 42 seat back pad material 421 center pad material 422 side pad material 423 slit 424 slit 425 inclined slit 426 connecting member 427 elastic sheet 46 holder bracket 47 stay holder 50 headrest 52 Stay 60 Link mechanism 61 First link arm 62 Second link arm 63 Load receiving member 66 Coil spring

Claims (3)

(57) [Claims] A headrest is provided at an upper edge of a seat back, and a load receiving member receiving an impact in the seat back and a stress transmitting mechanism that operates when an impact load of a predetermined value or more is applied to the load receiving member are provided inside the seat back. In a vehicle seat in which a headrest is raised by an operation of a mechanism and an occupant's head is received and protected by the headrest in the event of an impact, the pad material of the seat back is a side pad material and a center pad material fixed to a seat back frame. Are divided through a slit, and the center pad material is further divided into upper and lower parts through the slit, and the impact is effectively transmitted to the load receiving member by securing the sinking amount of the upper portion of the center pad material. A vehicle seat characterized in that: 2. The slit according to claim 1, wherein a slit for vertically dividing the center pad material in the pad material of the seat back into upper and lower portions is cut in an inclined shape which is inclined downward toward the rear. Vehicle seat. 3. The center pad material is connected by a curved connecting member or a sheet-like elastic member between the pad materials facing each other along a slit for vertically dividing the center pad material in the pad material of the seat back. The vehicle seat according to claim 1, wherein a sense of continuity is imparted to the vehicle seat.