JP2006087556A - Headrest - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headrest capable of appropriately supporting the head of an occupant with a simple constitution when an impact is applied to a car body. <P>SOLUTION: This headrest 1 is mounted on the upper part of a vehicle seat S via stays 11 and formed by positioning the free end sides of the stays 11 in the vehicle seat S, a back frame 2a of the vehicle seat S is provided with a receiving member 30 supporting the stays 11 when the impact is applied to the headrest 1, and the receiving member 30 is provided with a fixed part 31 fixed to the back frame 2a and a main deformation part 32 integrally formed with the fixed part 31 and collidable with the free ends of the stays 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a headrest, and more particularly, to a headrest having an impact absorbing function.

Conventionally, a seat provided with a headrest on a seat back has been adopted in an automobile. The headrest is formed with a core frame and cushioning material around the frame, and the surface is covered with a cover such as cloth. It is possible to reduce the impact on the
When an impact is received during traveling, the above-described conventional headrest can provide a buffering effect. However, a technique for obtaining a higher buffering effect is also known by devising the shock at the frame portion.

For example, a technique has been proposed in which a deformable portion capable of plastic deformation is provided on the headrest frame, and impact energy is absorbed by plastic deformation of the deformable portion (see, for example, Patent Document 1).
No. 5-12290 (No. 6-64548) and drawings (page 6-7, FIG. 3)

  In the technique of the above-mentioned patent document 1, a deformed portion crushed flat is provided on a pipe-like support member that supports a headrest frame. When an impact is applied to the vehicle body due to a rear-end collision or the like, the support member is bent backward due to plastic deformation of the deformed portion, and the impact applied to the occupant is absorbed.

As described above, in the technique shown in Patent Document 1, in addition to the impact absorption by the cushioning material, it is possible to further reduce the impact on the occupant during the collision.
However, in the technique of Patent Document 1, since the deformed portion becomes a projection when deformed, the deformed portion is covered with a cover made of a synthetic resin pipe from the viewpoint of occupant protection. There was a problem that it took time and effort to install the

  In addition, since the deformed portion is a flat plate-like support member, the flat portion has a double structure, and it is difficult to ensure a sufficient deformed state for shock mitigation when receiving an impact. There was an inconvenience.

  An object of the present invention is to provide a headrest that can appropriately support the head of an occupant with a simple configuration when an impact is applied to the vehicle body.

According to the headrest of the first aspect, the subject is a headrest that is mounted on an upper portion of a vehicle seat via a stay, and the free end side of the stay is positioned in the vehicle seat. The back frame of the seat is provided with a receiving member capable of supporting the stay when an impact is applied to the headrest. The receiving member includes a fixing portion fixed to the back frame, and a fixing portion integrated with the fixing portion. And a main deformation part that can collide with the free end side of the stay.
Since the headrest of the present invention is configured as described above, it is possible to obtain a higher cushioning effect in addition to the impact relaxation by the cushioning material.
That is, when an occupant falls back due to an impact on the vehicle body or an occupant of the rear seat moves forward and an impact is applied to the headrest, the headrest is moved to the seat side and applied to the receiving member, and the receiving member is deformed. Absorbs impact energy and mitigates impact on passengers.

In addition, providing the weakened portion in the fixing portion is preferable because the strength of the fixing portion can be adjusted.
The main deformation portion includes a collision surface with the stay and a standing surface standing from the collision surface. By providing the weak portion on the standing surface, it is possible to adjust the strength of the standing surface.

In addition, the weak part is specifically formed by providing a hole, a notch part, or a thin part.
The shape of the hole, notch, or thin portion is changed according to the rigidity of the stay.
The receiving member is a plate-like member, and the plate thickness of the receiving member is changed according to the rigidity of the stay.
As described above, the strength of the support member can be changed so as to absorb the shock most effectively according to the rigidity of the stay, and it is possible to deal with headrests of various specifications.

  The headrest of the present invention is configured such that when an impact is applied to the headrest, the free end side of the stay collides with a receiving member provided on the back frame of the vehicle seat. The receiving member is deformed while supporting the headrest by impact, and absorbs the impact.

  As described above, according to the headrest of the present invention, it is possible to reduce the impact applied to the headrest with a simple configuration, in addition to the cushioning effect by the cushioning material.

  The receiving member is configured such that the strength can be adjusted by changing the plate thickness or providing a fragile portion. Therefore, even when the stays have different stiffnesses, the strength of the receiving member can be adjusted accordingly to adjust the shock so as to absorb the impact most effectively. Therefore, it is possible to deal with various specifications widely.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, the members, arrangements, and the like described below do not limit the present invention, and it is needless to say that various modifications can be made in accordance with the spirit of the present invention.
FIG. 1 is an explanatory view showing a vehicle seat provided with a headrest according to the present embodiment, FIG. 2 is a perspective view of a support member for the headrest according to the present embodiment, and FIG. 3 is a perspective view showing a deformed state of the support member. 4 is a cross-sectional view showing a state before the headrest receives an impact, and FIG. 5 is a cross-sectional view showing a state after the headrest receives an impact.

The headrest 1 of this example is used for the vehicle seat S.
The vehicle seat S includes a headrest 1 and a seat back 2. The headrest 1 is provided in the upper part of the vehicle seat S.
The headrest 1 includes a headrest frame 10, a pad material as a cushioning material disposed on the outside of the headrest frame 10 for processing, and a skin material (not shown) that covers the pad material. It is composed of

The pad material is made of a foamed resin material, for example, urethane foam. The pad material is formed by integrally molding a foamed resin material on the headrest frame 10. That is, the headrest frame 10 is set in a mold, and the mold is filled with a resin material and foamed. Instead of integral molding, a configuration in which a pad material previously molded into a predetermined shape is assembled to the headrest frame 10 may be employed.
The pad material is covered with a skin material made of synthetic leather such as genuine leather, a vinyl chloride sheet, or cloth.

  The headrest frame 10 of this example is made of a steel pipe-like member or a solid round bar member, and is formed by bending any of these members into the illustrated shape. The headrest frame 10 is formed by pressing or cutting.

  The headrest frame 10 is provided with a stay 11 for attaching the headrest 1 to the seat back 2. The stay 11 is provided so as to protrude from the headrest 1.

The stay 11 of the headrest frame 10 is located in the vehicle seat S and is attached to the back frame 2 a of the seat back 2.
In this example, a guide member 2b is provided on the back frame 2a of the seat back 2, and the stay 11 is inserted through the guide member 2b. In this example, the stay 11 is normally held by the guide member 2b. However, when an impact is applied to the headrest 11, the stay 11 is held by the guide member 2b with such a force that the stay 11 can move.

A receiving member 30 is provided on the free end 12 side of the stay 11. The receiving member 30 is attached to the back frame 2a.
In normal times, a slight gap is provided between the free end 12 of the stay 11 and the receiving member 30.

  As shown in FIG. 2, the receiving member 30 includes a plate-like fixing portion 31 fixed to the back frame 2 a and a main deformation portion 32 formed integrally with the fixing portion 31.

  The fixed portion 31 and the main deformation portion 32 are made of a material that is easily plastically deformed, and are formed of a metal plate such as aluminum, stainless steel, or iron plate, for example.

  The fixing portion 31 is a plate-like plate member, and is fixed to the back frame 2a by welding. Alternatively, the fixing portion 1 is attached to the back frame 2a with screws or screws.

  The main deformation part 32 is formed integrally with the fixing part 31. The fixing portion 31 and the main deformation portion 32 are formed from a single metal plate. Or when the fixing | fixed part 31 and the main deformation | transformation part 32 are formed from another member, the fixing | fixed part 31 and the main deformation | transformation part 32 are integrally connected by welding etc.

  The main deformation part 32 is a substantially L-shaped plate member. The main deformable portion 32 includes a collision surface 32a that collides with the free end 12 of the stay 11, and a standing surface 32b that stands from the collision surface 32a.

  The receiving member 30 collides with the stay 11 and deforms when the headrest 1 receives an impact. And it is comprised so that the impact concerning the headrest 1 may be absorbed by changing.

  That is, as shown in FIG. 3, when an impact is applied to the headrest 1, the free end 12 side of the stay 11 collides with the collision surface 32a, and due to this impact, the fixed portion 31 is distorted and the collision surface 32a is moved downward. Deforms while bending. In this way, the impact is absorbed while the receiving member 30 is broken. When an impact is applied and the main deformation portion 32 is bent downward, the free end 12 side of the stay 11 further abuts against the standing surface 32b. At this time, the standing surface 32b is further deformed to absorb the impact.

The receiving member 30 is configured so that the strength can be changed according to the rigidity of the stay 11.
The strength is changed by changing the plate thickness of the fixing portion 31 and the main deformation portion 32.
Alternatively, the fixing portion 31 and the main deformation portion 32 are provided with weak portions.

  For example, when the stay 11 has low rigidity, the stay 11 itself is deformed when subjected to an impact. Therefore, the strength of the receiving member 30 is such that the stay 11 is deformed while supporting the stay 11 and the receiving member itself is further deformed. It must be strong enough to deform.

  Further, when the stay 11 has a high rigidity, the deformation of the stay itself is not taken into consideration, so that the shock absorption due to the deformation of the receiving member 30 is surely performed. For this reason, it is set as the intensity | strength which the receiving member 30 deform | transforms reliably when it collides with the stay 11. FIG.

  The fragile portion is provided on the fixed portion 31 or the standing surface 32 b of the main deformation portion 32. In this example, the structure by which the weak part was provided in both the fixing | fixed part 31 and the standing surface 32b of the main deformation part 32 is shown. In addition, it is good also as a structure which provided the weak part in only either one.

In this example, the weak part of the fixing | fixed part 31 is provided as the hole 31a and the elongate hole 31b. The hole 31a and the long hole 31b are formed in a substantially elliptical shape.
The weak part of the standing surface 32b is provided as a hole 32c.
Note that the configuration of the fragile portion is not limited to the hole 31a, the long hole 31b, and the hole 32c, and can be variously changed. Other embodiments of the vulnerable part will be described later.

4 and 5 illustrate the movement of the headrest 1 when a load is applied to the headrest 1 due to an impact received by the vehicle body.
As shown in FIG. 4, the headrest 1 is disposed with a gap x between the headrest 1 and the seat back 2. A slight gap is also provided between the free end 12 of the stay 11 and the receiving member 30.

  When the vehicle collides with a front obstacle while riding the vehicle, the reaction force causes the passenger in the rear seat to move forward, and an impact is applied to the headrest of the front seat from obliquely upward.

When an impact is applied to the headrest 1, the headrest 1 is pushed into the seat side and collides with the receiving member 30.
When receiving the impact from above, the fixing portion 31 and the main deformation portion 32 of the receiving member 30 are deformed by bending the main deformation portion 32 downward while causing the fixing portion 31 to be distorted. Furthermore, the standing surface 32b of the main deformation portion 32 is bent downward and deformed.

  Thus, the receiving member 30 is collided with the stay 11 and is deformed while supporting the stay 11. As the receiving member 30 is deformed, the headrest 1 is pushed into the seat side by a distance corresponding to the gap x.

  Thus, the impact energy applied to the headrest 1 is absorbed by the deformation of the receiving member 30. Therefore, in addition to the impact mitigation by the pad material 20, the impact on the occupant can be further mitigated.

  In the above-described embodiment, the example in which the fixing portion 31 is provided with the two holes 31a and the long hole 31b and the main deformation portion 32 is provided with the hole 32a is shown as the fragile portion. Alternatively, other processing may be performed.

For example, in FIG. 2, a substantially elliptical long hole 31b is formed, but it may be a rectangular or polygonal hole instead of an elliptical shape. Moreover, the structure provided with either the hole 31a or the long hole 31b may be sufficient. Further, the number of holes may be any number as long as the impact can be reduced by an appropriate shape change.
In addition, although the example in which the hole 32a of the main deformation portion 32 is circular has been shown, the shape is not limited thereto, and may be other shapes such as an ellipse or a polygon.

Furthermore, it is good also as a structure which provided notch part 31c as a weak part instead of a hole as shown in FIG. Moreover, you may provide not only the notch part 31c but the thin parts 31d and 32d as shown in FIG.
By providing the thin portion 32d, this portion can be used for positioning and holding the stay 11 or as a guide.

  Further, as shown in FIG. 8, the fixing portion 31 may be provided with a rib 31 e. The rib 31e is preferably provided when the fixing portion 31 is desired to have an appropriate strength. The rib 31e can also be used for positioning and holding the stay 11. The rib 31e can also be used as a guide for the stay 11.

  As described above, by providing the guide for the stay 11, it is possible to cause the free end 12 of the stay 11 to collide with the appropriate position of the receiving member 30. When the stay 11 collides with an appropriate position, the receiving member 30 is appropriately deformed. As described above, the rib 31 e also serves as a guide for the stay 11.

  In the above embodiment, the stay 11 has a linear shape and the free end 12 collides with the receiving member 30. However, when the tip of the stay 11 has an L shape or a U shape, the stay 11 is free. The free end side may collide with the receiving member 30 instead of the end 12 itself.

  Furthermore, although the fixing | fixed part 31 showed the structure which consists of plate-shaped board | plate materials, as long as the main deformation | transformation part 32 can be hold | maintained appropriately, you may use a linear member instead of a plate-shaped member, for example.

  Next, an impact absorption test was performed on the headrest 1 formed as described above. Specifically, the headform was collided from behind the seat back, and the deceleration generated at the time of the collision was measured.

  As a result, it was found that when the headrest 1 of this example is used, the deceleration is reduced to about half compared to the case where the conventional product is used.

It is explanatory drawing which shows the vehicle seat provided with the headrest which concerns on this invention. It is a perspective view of the receiving member of a headrest. It is a perspective view which shows the state which the receiving member deform | transformed. It is explanatory drawing which shows the state before a headrest receives an impact. It is explanatory drawing which shows the state after a headrest received the impact. It is explanatory drawing which shows another Example. It is explanatory drawing which shows another Example. It is explanatory drawing which shows another Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Headrest 2 Seat back 2a Back frame 2b Guide member 10 Headrest frame 11 Stay 12 Free end 30 Receiving member 31 Fixing part 31a Weak part (hole)
31b Fragile part (long hole)
31c Vulnerable part (notch part)
31d Weak part (thin part)
32 Main deformation part 32a Colliding surface 32b Standing surface 32c Weak part (hole)
32d Weak part (thin part)
S Vehicle seat x clearance

Claims (8)

A headrest mounted on the upper part of the vehicle seat via a stay, the free end side of the stay being positioned in the vehicle seat;
The back frame of the vehicle seat is provided with a receiving member capable of supporting the stay when an impact is applied to the headrest,
The receiving member includes a fixing portion fixed to the back frame;
A main deformation portion formed integrally with the fixing portion and capable of colliding with the free end side of the stay;
Headrest characterized by. The headrest according to claim 1, wherein the fixing portion is provided with a fragile portion. The headrest according to claim 1, wherein the main deformation portion includes a collision surface with the stay and a standing surface standing from the collision surface, and a fragile portion is provided on the standing surface. 4. The headrest according to claim 2, wherein the fragile portion is formed by providing a hole. The headrest according to claim 2, wherein the fragile portion is formed by providing a notch portion. 4. The headrest according to claim 2, wherein the fragile portion is formed by providing a thin portion. The headrest according to any one of claims 4 to 5, wherein the hole, the cutout portion, or the thin-walled portion has a shape changed according to the rigidity of the stay. The headrest according to claim 1, wherein the receiving member is a plate-like member, and the thickness of the receiving member is changed according to the rigidity of the stay.

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