JPS6312768Y2 - - 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. using 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 since the reinforcing substrate 3 acts as an elastic body, for example, in the case of a car, 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 and has an appropriate degree of deflection.

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,
The head of the shock absorbing core is supported by deforming a bulge that bulges inwardly or outwardly from the respective surfaces in a predetermined area approximately in the center of the supporting surface side and the back side, and the side walls of this bulging portion are deformed. The device is characterized in that the head abutting portion is formed by forming the side wall into a step-like cross section and integrally sealing the tip end of the side wall with the bottom wall.

If such a measure is adopted, even though the whole body is rigid, the side wall with a stepped cross section expands and contracts at the part where the head touches, so a wide shock absorption effect can be achieved, and it also makes it easier to lean the head. Appropriate flexure is obtained when the seat is extended, and the same effect occurs when the rear seat occupant bends forward.

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 body incorporated into a headrest according to the present invention;
2 and 3 are cross-sectional views taken along lines - and - in FIG. 1, and in the following description, the same members as those shown in FIG. 8 are given the same reference numerals, and their explanation will be omitted.

This shock absorbing core (hereinafter simply referred to as core) 1
0 has its exterior covered with a buffer member 1, which is then wrapped with an outer skin 2 to form a headrest.

As is clear from the above figures, the core body 10 is a trapezoidal, almost hermetically molded hollow body having an overall uniform wall thickness, and is made of thermoplastic resin, such as polyethylene, polypropylene, polyvinyl chloride, or It is constructed using nylon or the like.

However, if the wall is simply made hollow, there is a risk that the deflection will not be sufficient if the wall thickness becomes thick. Despite this, it is made to be difficult to deform.

Further, on the head support surface 14 side and the back surface 15 side of the core body 10, a head contact portion 1 bulged inward from the surface is provided in a predetermined area approximately at the center thereof.
1 is formed.

The head abutting portion 11 has inwardly bulging portions 12f and 12r having a diameter that does not allow the occupant's head to fit into it.
The side walls 16f, 16r are formed to have a stepped cross section, and the tips of the side walls 16f, 16r are
Bottom walls 17f and 17r integrally formed with the side walls 16f and 16r are provided to seal the core body 10 hermetically.

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, air is sucked into the parison of thermoplastic resin extruded from a die in an opened mold, and the parison expands.At the same time, the mold is closed from both sides and the expansion is controlled from the outside. Make the shape as shown.
In this case, the work process can be simplified if the stay 4 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 phenol resin. By constructing the stay 4 using such a member, it is possible to obtain a stay 4 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 head rest.

A headrest can be constructed by placing the core body 10 configured in this way inside, providing a cushioning member 1 made of foam as shown in FIG. 8 on the outside, and covering this with a skin 2. In such a headrest, since there is a larger amount of the cushioning member 1 in the area where the occupant's head touches than in other areas, it feels good when the occupant's head is rested on, and an appropriate amount of deflection is obtained. Retention is also ensured.

Furthermore, if the occupant's head were to collide with the core body 10 due to a sudden collision, the head would not enter the inwardly bulging portion 12f, but would collide with its mouth. This collision force will first pressurize the buffer member 1, and this pressurizing force will be transmitted to the bottom wall 17f etc. of this recessed hole part 12f, and this bottom wall 17f etc. will be pressurized. However, even if this bottom wall 17f is pressurized, since a side wall 16f with a stepped cross section is formed on the outer peripheral edge of this bottom wall 17f, the pressurizing force will also deform this side wall 16f. . Therefore, the impact absorption effect of this headrest is due to the deformation of the side wall 16f and the impact absorption effect of the bottom wall 1.
This is absorbed by the deformation of 7f itself and the damper action of the air sealed within the core.

In other words, the core body 10 of the above embodiment uses the shock absorbing member 1 to cope with a small impact energy, by the elastic force of the shock absorbing member 1 and the bottom wall 17f in the case of a medium impact energy, and by the shock absorbing member 1 in the case of a large impact energy. 1. Energy is absorbed by the elastic force of the bottom wall 17f, the elastic deformation of the side wall 16f, and the damper action of the air sealed within the core body 10, and the impact energy is absorbed over an extremely wide range. Become. Furthermore, the high energy absorption effect means that the recoil when an impact is applied is small, which prevents the occupant's head from colliding with a windshield or the like due to the recoil.

Such a shock absorbing effect also occurs when a rear seat occupant collides his or her head against the rear side of the headrest when sudden braking is applied. According to experiments, it has been found that the impact force is reduced by 20% compared to a headrest that has a closed hollow core and does not have an inwardly bulging portion.

In addition, if inwardly bulging parts 12f and 12r having side walls with a step-like cross section are formed as energy absorbing parts in the hollow core body 10 formed almost hermetically, the feeling when the head is rested is improved. This will ensure good head retention.

Note that the aforementioned side walls 16f and 16r may have any shape as long as they have the function of absorbing energy. For example, the stepped inner wall may have a bellows shape or a spiral shape. good.

Further, as shown in FIGS. 4 and 6, the head abutting portion 11 is formed in a predetermined area approximately at the center of the core body 10 on the head support surface 14 side and the back surface 15 side, and expands outward from the surface thereof. The outwardly bulging portions 18f and 18r may be provided.

With this configuration, the amount of the buffer member 1 near the head contact portion 11 is reduced compared to the above-described embodiment, but in return, the amount of air sealed within the core body 10 is reduced.
Furthermore, the range of variation of the side walls 16f and 16r is increased, and the impact absorption effect is approximately the same as that of the previous embodiment.

Further, inwardly bulging portions 12f and 12r shown in FIG.
The mouth edge portion may be rectangular as shown in FIGS. 5 and 7 instead of being oval. In addition, in these FIGS. 4-7, the same code|symbol is attached|subjected to the member same as the member shown in FIGS. 1-3.

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. Forming a bulge that bulges inwardly or outwardly from the surface of the core at a predetermined area approximately in the center of the head support surface and the back side of the core body, respectively;
The side wall of this bulge has a stepped cross-section, and the tip of this side wall is integrally sealed with the bottom wall to form a head abutting part, which prevents the occupant from colliding with the vehicle during a collision or braking. By colliding the head with this headrest, the energy from this collision can be widely absorbed, and even when the head is rested against the headrest at all times, it has an appropriate amount of deflection. The body is lightweight and strong, mass production is easy, and only a small amount of cushioning material is required, resulting in cost advantages and other excellent effects.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a shock absorbing core incorporated in a headrest according to the present invention, FIGS. 2 and 3 are layer sectional views taken along lines - and - in FIG. The figure is a perspective view showing another embodiment of the concentric body, Figures 6 and 7 are sectional views taken along lines - and - shown in Figures 4 and 5, and Figure 8 is a conventional headrest. FIG. 4...Stay, 10...Shock absorbing core, 11
...Head contact portion, 12f, 12r...Inward bulge portion, 13...Head portion, 14...Head support surface, 1
5... Back, 16f, 16r... Side wall, 17f,
17r...Bottom wall, 18f, 18r...Outward bulge.

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., and a shock-absorbing core is provided outside of this shock-absorbing core, and the entire structure is covered with a skin. In this headrest, the impact-absorbing core is made of a hollow thermoplastic resin having a uniform wall thickness and formed into a nearly hermetically sealed body, and the impact-absorbing core has a head support surface side and a back surface. A bulge that bulges inwardly or outwardly from the surface is formed in a predetermined area approximately in the center of each side, and the side wall of this bulge is formed into a step-like cross section, and the tip of this side wall is shaped like a bottom. A headrest characterized in that a head contact portion is formed by integrally sealing with a wall. 2. The head rest according to claim 1, wherein the stay is a plastic rod reinforced with long glass fibers. 3. The head rest according to claim 1 of the utility model registration claim, wherein the stay is a metal rod.