JP2008229108A - Headrest and vehicle seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more efficiently absorb the energy in rear end collision than a conventional headrest. <P>SOLUTION: The headrest 4 of the vehicle seat 1 includes a headrest frame 41 formed in the inverted U-shape as seen from the front and a pad part 45 wrapping the upper part of the headrest frame 41. The headrest frame 41 has two leg parts 42 and 43 disposed parallel with a space therebetween in the left and right sides to extend in the vertical direction, and a beam part 44 laid between the leg parts 42 and 43. An upper part 42a of the leg part 42 is formed in the shape similar to the occipital area 99 of the human body. In other words, the upper part 42a of the leg part 42 is dented rearward. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a headrest and a vehicle seat, and more particularly to a headrest that receives an occupant's head and a vehicle seat including the headrest.

  Conventionally, a headrest (see, for example, Patent Document 1) is provided in a vehicle seat, and an occupant can support his / her head on the headrest.

On the other hand, when a so-called rear collision occurs, such as when a car collides in the middle of retreating, or a rear-end collision occurs, the head of the seated occupant suddenly tilts backward due to inertial movement. There is a risk of impact on the part. Therefore, in recent years, various techniques for safely protecting a passenger's head and neck from an impact at the time of a rear collision have been applied to a vehicle seat such as an automobile. As one of such techniques, there is a technique for mitigating an impact on an occupant at the time of a rear collision (see, for example, Patent Document 1 and Patent Document 2).
JP 2001-333832 A Japanese Patent Laid-Open No. 2005-211402

In Patent Document 1, the cushion member of the headrest is improved using a low-resilience urethane foam to reduce the impact on the occupant. However, since the frame is hardly devised, the impact reduction efficiency is low. In the method, Patent Document 2, the structure of the headrest frame is complicated, and the weight of the headrest is increased.
Since the higher the efficiency of mitigating the impact, the better. Therefore, automobile users want to absorb the energy at the time of rear-end collision more efficiently and mitigate the impact, and the one that is as light as possible is also desired. ing.

  The subject of this invention is providing the lightweight headrest and vehicle seat which can absorb the energy at the time of a rear collision efficiently compared with the former by adding a device to the shape of a headrest frame.

In order to solve the above problems, the invention according to claim 1 is a headrest,
A headrest frame having a shape along the back of the human body;
A pad portion provided on the front side of the headrest frame.

The invention according to claim 2 is the headrest,
A headrest frame extending vertically and recessed backwards;
And a pad portion provided on the front side of the headrest frame.

The invention according to claim 3 is the headrest according to claim 1 or 2,
The pad portion has a low resilience foamed resin portion formed of a foamed resin.

The invention according to claim 4 is the vehicle seat,
The headrest according to any one of claims 1 to 3,
A seat seat,
A seat back standing from the seat seat,
The headrest is provided on an upper portion of the seat back.

  According to the first aspect of the invention, since the headrest frame has a shape along the back of the human body, when the back of the occupant falls back due to an inertial force caused by the rear impact of the vehicle, the back of the head contacts the pad portion. Further, the pad portion is pushed and recessed by the back head. For this reason, the head of the occupant does not rapidly fall backward, and the impact on the occupant's neck can be reduced. When the pad portion is recessed, the impact load is absorbed, and the reaction force from the pad portion to the occupant's head can be suppressed, and the impact on the occupant's neck can be reduced. In addition, the headrest frame is devised in order to mitigate the impact on the occupant's neck, and a complicated structure is not used for the headrest frame, so a lightweight headrest can be provided.

  According to the second aspect of the present invention, since the headrest frame is provided in a state of being recessed rearward, when the occupant's rear head falls back due to inertial force due to the rear impact of the vehicle, the rear head contacts the pad portion. Furthermore, the pad portion is pushed and recessed by the back head. For this reason, the head of the occupant does not rapidly fall backward, and the impact on the occupant's neck can be reduced. When the pad portion is recessed, the impact load is absorbed, and the reaction force from the pad portion to the occupant's head can be suppressed, and the impact on the occupant's neck can be reduced. In addition, the headrest frame is devised in order to mitigate the impact on the occupant's neck, and a complicated structure is not used for the headrest frame, so a lightweight headrest can be provided.

  According to the invention of claim 3, the impact force of the head is absorbed by the low-resilience foamed resin portion at the time of rear-end collision of the vehicle.

  According to the invention which concerns on Claim 4, the impact of a passenger | crew's neck can be suppressed at the time of the rear collision of a vehicle, etc.

  Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. However, although various technically preferable limitations for implementing the present invention are given to the embodiments described below, the scope of the invention is not limited to the following embodiments and illustrated examples.

FIG. 1 is a perspective view showing a schematic configuration of a vehicle seat 1 according to the present invention.
As shown in FIG. 1, the vehicle seat 1 includes a seat seat portion 2, a seat back 3 connected to the rear end portion of the seat seat portion 2, and a headrest 4 provided on the upper portion of the seat back 3. Prepare.

  The seat seat 2 is connected to the vehicle floor via a position adjustment mechanism and a height adjustment mechanism, the front and rear positions of the seat seat 2 are adjusted by the position adjustment mechanism, and the height of the seat seat 2 is further increased. It is adjusted by the height adjusting mechanism. In addition, a conventionally well-known thing can be used as such a position adjustment mechanism part and a height adjustment mechanism part.

  The seat seat portion 2 has a frame body covered with a cushion, and receives the occupant's buttocks on the lower side to support the buttocks.

  A seat back 3 is connected to a rear end portion of the seat seat portion 2 via a reclining mechanism portion. The reclining mechanism adjusts the angle of the seat back 3 with respect to the seat portion 2, and the reclining mechanism causes the seat back 3 to fall backward or stand up, and the reclining mechanism locks the seat back 3. . As such a reclining mechanism part 6, conventionally well-known things, such as what is disclosed by Unexamined-Japanese-Patent No. 10-276850, Unexamined-Japanese-Patent No. 8-253063, and WO2004 / 017797A1, can be used, for example.

  The seat back 3 has a frame covered with a cushion, and receives the back of the occupant behind it to support the back.

FIG. 2 is a front view of the headrest 4 with a part thereof broken away.
As shown in FIG. 2, the headrest 4 includes a headrest frame 41 and a pad portion 45 provided so as to wrap up the upper portion of the headrest frame 41.

  The headrest frame 41 is a pillar having an inverted U shape when viewed from the front. That is, the headrest frame 41 includes two leg portions 42 and 43 that extend in the vertical direction and are arranged in parallel at intervals in the left and right sides, and a beam portion 44 that is installed between the upper ends of the leg portions 42 and 43. Have

  FIG. 3 is a side view showing a cross section and the like of the headrest 4. As shown in FIG. 3, the upper part 42a of the leg part 42 is formed in the shape along the back head 99 of the human body. That is, the upper part 42a of the leg part 42 is formed in a state of being recessed backward, and the upper part 42a is curved in a bow shape. The leg portion 42 is bent forward at the lower portion 42b and bent backward at the intermediate portion 42c between the lower portion 42b and the upper portion 42a. The shape of the leg 43 in a side view is the same as that of the leg 42, and the leg 43 is bent forward at the lower part thereof and bent backward at the intermediate part between the upper part and the lower part. And the upper part of the leg part 43 is formed in the state dented back, and it curves in the shape of a bow in the upper part. In FIG. 3, the occipital region 99 of the human body is the occipital region of the occupant seated on the vehicle seat 1.

  It is more preferable that the beam portion 44 is also formed in a shape along the back head 99 of the human body. That is, it is more preferable that the left and right central portions of the beam portion 44 are formed in a state of being recessed rearward.

  The pad portion 45 includes a skin 48 formed in a bag shape, a wadding 47 joined to the inner surface of the skin 48, and a urethane resin portion 46 filled inside the wadding 47. Of the headrest frame 41, the part above the recessed part behind the lower part 42 b of the leg part 42 and the part above the recessed part behind the lower part of the leg part 43 are inserted inside the skin 48, The urethane resin portion 46 is filled inside. Therefore, the portion of the headrest frame 41 that is inserted inside the skin 48 is covered with the urethane resin portion 46, and the pad portion 45 is on the front side of the upper portion 42 a of the leg portion 42 and the upper portion of the leg portion 43. Is also provided. The urethane resin portion 46 is made of low-resilience urethane obtained by expanding and expanding a foamable urethane resin. For example, a low-resilience low-elasticity urethane member described in JP-A-2001-333832 is applied to the urethane resin portion 46. Can do. For example, a urethane material having a density of 40 to 100 kg / cubic meter, a 25% hardness of 30 to 140 N (Newton) and a rebound resilience of 3 to 15% is used for the urethane resin portion 46.

  Further, when viewed from the side, the front surface of the pad portion 45 is curved so as to be convex forward.

  Lower portions of the bent portions of the leg portions 42 and 43 extend downward from the skin 48. As shown in FIG. 2, a plurality of stop portions 43 d are arranged on the leg portion 43 in the vertical direction, and these stop portions 43 d are formed in a cutout state.

  On the other hand, two hole-shaped attachment portions 32 and 33 are provided on the upper end surface of the seat back 3, and the headrest 4 is attached to the seat by inserting the leg portions 42 and 43 into the attachment portions 32 and 33, respectively. It is attached to the upper end of the back 3. One attachment portion 33 is provided with a stopper, and the leg portion 43 is fixed to the seat back 3 by the stopper engaging with the stopper portion 43d. On the other hand, when the stopper is unlocked, the leg portions 42 and 43 can be moved up and down to remove the leg portions 42 and 43 from the attachment portions 32 and 33 or insert them in the reverse direction.

Next, the operation at the time of a rear collision of the vehicle will be described.
When a vehicle is impacted from behind the vehicle on which the vehicle seat 1 is mounted, or when the vehicle retreats and the rear of the vehicle collides, the head of the occupant seated on the vehicle seat 1 falls backward due to inertial force. Since the upper portions of the leg portions 42 and 43 are recessed rearward, the occupant's head 99 falls back while the occupant's occipital region 99 pushes the pad portion 45. Since the pad portion 45 resists the rearward tilt of the occupant's head, the occupant's head does not fall rapidly backward. That is, the acceleration at which the occupant's neck is bent backward is low, and the impact on the occupant's neck can be reduced. Further, since the pad portion 45 is deformed when the occupant's head is moved backward, the impact load of the head is absorbed, and the reaction force from the pad portion 45 to the head is small. Therefore, the impact on the occupant's neck is reduced.

  Further, since the impact on the neck of the occupant can be reduced only by devising the shape of the headrest frame 41, the weight of the headrest 4 does not increase.

  The embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.

  For example, in the above embodiment, the urethane resin portion 46 is filled inside the skin 48, but is not limited to the urethane resin portion 46 as long as it has cushioning properties and is elastically deformed. Other foamed resin parts, fiber materials (for example, cotton, wool) or the like may be filled inside the skin 48, and in particular, a low resilience foamed resin part like the urethane resin part 46 is more preferable. The foamed resin portion is formed by foaming a foamable resin (for example, polypropylene).

  Moreover, in the said embodiment, although the pad part 45 is provided so that the upper part of the headrest frame 41 may be wrapped, at least the front side of the recessed part (the upper part 42a of the leg part 42, or the upper part of the leg part 43) As long as it is provided.

  Moreover, in the said embodiment, although the headrest frame 41 was a pillar, the form is not specifically limited, For example, plate shape may be sufficient and frame shape may be sufficient. In any form, the front portion of the headrest frame 41 is formed in a state of being recessed rearward, and the front surface is formed in a shape along the occipital region 99 of the human body.

It is the perspective view which showed the vehicle seat which concerns on this invention. It is the front view which showed the headrest. It is a sectional side view of a headrest.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat seat part 3 Seat back 4 Headrest 41 Headrest frame 45 Pad part

Claims (4)

A headrest frame having a shape along the back of the human body;
And a pad portion provided on the front side of the headrest frame. A headrest frame extending vertically and recessed backwards;
And a pad portion provided on the front side of the headrest frame.   The headrest according to claim 1 or 2, wherein the pad portion has a low-resilience foamed resin portion formed of a foamed resin. The headrest according to any one of claims 1 to 3,
A seat seat,
A seat back standing from the seat seat,
A vehicle seat, wherein the headrest is provided on an upper portion of the seat back.

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