JPS6312767Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a headrest attached to the top of a vehicle seat or the like, and particularly to improvements to a shock absorbing core provided within the headrest.

Generally, a headrest is often attached to the top of the backrest of seats used in automobiles, railcars, aircraft, etc. by means of stays.

The structure of this headrest has conventionally included a cushioning member 1 made of foam and a skin 2 covering the cushioning member 1, as shown in FIG. The substrate 3 is buried,
A stay 4 is fixed to this reinforcing board 3.

However, in a headrest with such a structure, most of the impact energy during an accident is absorbed by the cushioning member 1, so its energy absorption effect is limited, and even though a large amount of expensive padding is used, has a low impact absorption effect, and furthermore, since the reinforcing substrate 3 acts as an elastic body, in the case of a car, for example, the reaction force acts to direct the head of the occupant toward the windshield, etc., resulting in a dangerous situation. There was also the risk of inviting

In addition, recently, it has been proposed that the reinforcing board 3 is made of hollow synthetic resin for the purpose of reducing weight and cost, but even if the headrest is made using such a core, it will not be able to absorb impact energy with a wide width. The current situation is that it is difficult to obtain people with this ability.

The present invention was devised in view of these conventional problems, and aims to provide a core body that can absorb impact energy over a wide range from small impacts to large impacts.

In order to achieve the above object, the present invention comprises a shock-absorbing core made of a thermoplastic resin having a substantially hermetic hollow body having a uniform wall thickness as a whole,
At least two recessed holes are formed at opposing positions on the head support surface side and the back side of the shock absorbing core, and the recessed holes are spaced apart so that a head receiving portion is formed between the recessed holes, The inner wall of each of the recessed holes is formed to have a stepped cross section, and the opposing bottom walls of the recessed holes are integrally connected to each other.

If such a method is adopted, even if the whole body is rigid, the side wall with a stepped cross section will expand and contract in the part where the head touches, and the impact force from the head support side or back side will be absorbed by the recessed hole. The impact force is transmitted through the bottom wall of the core body to the opposite side wall, which has a stepped cross section, and the opposite side wall is also deformed. Even the air sealed inside acts as a damper, so even if various impact forces are applied, it can be reliably absorbed.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an example of a shock absorbing core incorporated in a headrest according to the present invention, and FIGS. 2 and 3 are cross-sectional views taken along lines - and - in FIG. In the following description, the same members as those shown in FIG. 4 are given the same reference numerals, and the description thereof will be omitted.

This shock absorbing core body (hereinafter simply referred to as core body) 10 is covered with a buffer member 1 on the outside,
This is wrapped with the skin 2 to form the head rest.

As is clear from the above figures, the core body 10 is a trapezoidal, almost hermetically molded hollow body having a generally uniform wall thickness, and is made of thermoplastic resin,
For example, it is molded using polyethylene, polypropylene, polyvinyl chloride, nylon, or the like.

However, if the wall thickness is simply made hollow, there is a risk that the deflection will not be sufficient if the wall thickness becomes large. Although it is thin, it is not easily deformed.

Moreover, on the head support surface 14 side of this core body 10,
At least two recessed holes 11f, 11 are formed so that a flat head receiving portion 10a is formed approximately in the center.
f are formed at a predetermined distance apart, and the inner wall 16f of each recessed hole portion 11f is also formed to have a stepped cross section, and the tip of the inner wall 16f has a
A bottom portion 17 is provided integrally with this inner wall 16f.

On the other hand, similar to the head support surface 14 side, recessed holes 11r, 11r are formed in at least two places on the back surface 15 side of this core body 10.
The side recessed holes 11r, 11r and the head support surface 1
The recessed holes 11f and 11f on the fourth side are provided at positions facing each other. And this double recessed hole part 1
The bottom portions 17, 17 of 1f, 11r are configured to be integrally connected to each other.

In order to form such a core body 10, it is desirable to use a blow molding method or a rotation molding method from the viewpoint of cost reduction and ease of production. That is, in an open mold, air is blown into the thermoplastic resin parison extruded from the die to expand it, and at the same time, the mold is closed from both sides to restrict the expansion from the outside. Make the shape as shown. In this case, the work process can be simplified if the stay 18 for attaching the headrest to the car seat is also integrally molded.

Note that the stay 4 may be a metal rod, but it may also be made of plastic reinforced in the axial direction with long glass fibers, for example, a rod-shaped object made of long glass fibers hardened with a thermosetting resin such as unsaturated polyester resin, epoxy resin, or phenolic resin. By constructing the stay 18 using such a material, it is possible to obtain a stay 18 that is excellent in absorbing impact force. These can also be held in a mold by adhering a melt of the same resin as the parison, and in this way even the stay can be easily molded integrally with the headrest.

A headrest is formed by placing the core body 10 constructed in this way inside, providing a cushioning member 1 made of foam on the outside as shown in FIG. 4, and covering this with a skin 2.

In this headrest, the double concave hole portion 1 of the core body 10 is
The head receiving portion 10a between 1f and 11r corresponds to the portion on which the occupant's head hits.

Suppose that the head of the passenger or the head of the rear seat passenger collides with this head support part 10a due to a sudden collision or sudden braking (in addition, if the head of the rear seat passenger collides with the head rest 10a) The impact energy is transmitted through the head support portion 10a to the inner wall 1 of the head support surface 14 and the recessed holes 11f and 11r of the back surface 15, each of which has a stepped cross section.
Absorbed by 6f and 16r.

It will be explained in further detail. The force generated by this collision is
First, the buffer member 1 is pressurized, and this pressurizing force is transmitted to the head receiving portion 10a.

The pressing force acting on this head receiving portion 10a is the second
As is clear from the figure, it is transmitted to the side wall 16f of the recessed hole portion 11f on the side of the head support surface 14, and this side wall 16f
It sways. Furthermore, this force is applied to the bottom 1 of the concave hole 11f.
The side wall 16 of the recessed hole portion 11r on the back side 15 side through 7
transmitted to r.

Therefore, the impact energy is absorbed first by the buffer member 1 itself, then by the side wall 16f on the head support surface 14 side, and further by the side wall 16r on the back surface 15 side. In addition, the impact energy also acts to elastically deform the head holder 10a itself, and this elastic deformation of the head holder 10a also pressurizes the air sealed within the core body 10. . This sealed air exhibits a damper effect, and the impact energy is also absorbed by this air.

Therefore, the impact energy is subjected to a plurality of stepwise energy absorption actions, so that the core body 10 effectively acts from small impact forces to large impact forces, and has impact energy absorption ability over a wide range. will be demonstrated.

According to experiments, it has been found that the head rest having the above structure can reduce impact force by 20% or more, compared to a head rest having a hollow core and no recessed hole.

As is clear from the above description, according to the present invention, the shock-absorbing core is made of a thermoplastic resin having a substantially hermetic hollow body having a uniform wall thickness as a whole. At least two recessed holes are formed at opposing positions on the head support side and the back side of the body, and the recessed holes are spaced apart so that a head receiving portion is formed between each of the recessed holes, and each of the recessed holes The inner wall of the recessed hole is formed with a step-like cross section, and the opposing bottom walls of the recessed hole are integrally connected to each other, so that it absorbs the impact energy of various impact forces and exhibits a wide impact absorption effect. Moreover, it has the excellent effect of being lightweight, sturdy, and mass-producable, making it possible to obtain a product at low cost.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIGS. 2 and 3 are sectional views taken along lines - and - in FIG. 1, and FIG. 4 is a longitudinal sectional view of the headrest. DESCRIPTION OF SYMBOLS 10... Shock absorbing core body, 10a... Head support part, 11f, 11r... Recessed hole part, 14... Bead part, 14... Head support surface, 15... Back surface, 16
f, 16r...inner wall.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A shock-absorbing core is provided at the top end of a stay attached to the top of a vehicle seat, etc., a shock-absorbing core is provided outside the shock-absorbing core, and the entire body is covered with a skin. In the headrest that is covered,
The impact-absorbing core is made of a thermoplastic resin having a substantially hermetic hollow body having a uniform wall thickness as a whole, and there are at least two holes on each of the head support side and the back side of the impact-absorbing core. The recessed holes are formed at opposing positions and are spaced apart so that a head receiving portion is formed between the recessed holes, and the inner wall of each of the recessed holes is formed to have a stepped cross section. A head rest formed by integrally connecting the opposing bottom walls of a hole. 2. Utility model registration claim 1, wherein the stay is a plastic rod reinforced with long glass fibers.
Headrest as described in Section. 3. The head rest according to claim 1, wherein the stay is a metal rod.