JPH0441130Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement in the bonding structure between a cap liner and a cap shell in a helmet used for a bicycle, skateboard, roller skate, etc.

(Prior art) Helmets worn by bicycle riders to protect their heads are currently mainly made of plastic materials, and generally, helmets made of foamed resin materials such as styrofoam resin can absorb impact. A double structure is often used, in which a liner and a cap shell made of a thin plate of hard, non-foamed resin that covers the outer surface are integrated.

For example, Publication No. 57-50244, Publication No. 57-50245
As can be seen in Publication No. 18413 of 1983, etc.

At this time, in order to integrate the inner and outer cap liners and the cap shell, an adhesive structure such as bonding by applying liquid adhesive or bonding by interposing double-sided tape has been used.

(Problem to be solved by the invention) The above-mentioned methods such as applying adhesive or double-sided tape do not have sufficient adhesive strength and often cause peeling phenomenon, which not only impairs safety but also damages the resin and adhesive. Therefore, there is a risk of material deterioration, and it is difficult to maintain strong adhesive strength over a long period of time.

The purpose of the present invention is to solve the problems caused by conventional adhesive structures, and, unlike the adhesive structure that simply spreads flatly between the corresponding surfaces of the cap liner and the cap shell, to By forming an adhesive layer by spraying a resin adhesive similar to that of the cap shell, it spreads and connects three-dimensionally throughout the required body of the cap liner, creating an extremely strong bond that will not peel off. This made it possible.

(Means for Solving the Problems) In order to achieve the above object, in the helmet of the present invention, both the cap liner made of a foamed resin material and the cap shell made of a non-foamed resin material are integrated by adhesive. In the cap liner, a plurality of adhesion holes are provided in the cap liner and communicate with the gap between the cap liner and the cap shell, and each bonding hole is provided with a plurality of adhesive holes that penetrate the cap liner and communicate with the gap between the cap liner and the cap shell, and the cap body is inserted into the gap from each adhesive through hole. The purpose is to integrate the cap liner and the cap shell by spraying a hot-melt adhesive made of a resin similar to that of the shell, so that the adhesive layer is formed in a continuous manner over the through hole and the gap.

(Function) According to the above-mentioned technical means of the present invention, the adhesive layer that integrates the cap shell and the cap liner is
An adhesive layer portion that fills and intervenes in the gap between the inner surface of the shell and the outer surface of the liner and spreads out in a substantially umbrella shape, and an umbrella-shaped adhesive layer portion that is adhered to or filled in the adhesive through hole provided in the liner. and a tubular or columnar adhesive layer portion that penetrates through the liner body,
Since the shell and liner have a three-dimensional shape and structure that connects both, their bonding properties are improved both quantitatively and qualitatively by expanding the bonding surface. Since a melt-type adhesive is used, a close integrity with great affinity for the shell is ensured, and strong adhesion is maintained over a long period of time without peeling, chipping, or cracking due to vibrations, shocks, etc. As a result, a strong and stable integration between the shell and the liner can be easily achieved, and the adhesive through-holes facilitate the spraying and adhesion of the adhesive.

(Embodiment) A suitable embodiment of the helmet of the present invention will be described with reference to FIGS. 1 to 3.

In FIG. 1, the outer surface of the cap liner 1, which is formed into a desired helmet shape using a foamed resin material such as a foamed polystyrene resin material that has cushioning properties for shock absorption, is made of, for example, polypropylene resin.
The cap shell 2, which is made of ABS resin, polycarbonate resin, etc. and is harder than the liner 1 and has impact resistance, heat resistance, etc., is polymerized through the gap 3, and by bonding and integrating both 1 and 2. A helmet is formed. Note that accessories such as pads attached to the inner surface of the cap liner 1 and chin straps are not shown, and ventilation holes formed across the liner 1 and shell 2 are also omitted.
Further, various designs, marks, inscriptions, etc. are displayed on the surface of the shell 2, as in conventional helmets.

In the present invention, the above-mentioned cap liner 1
As illustrated in FIGS. 1 and 2, a plurality of pieces are formed on the lower side of the circumferential surface of the liner 1, and penetrate through the liner in the thickness direction, and one end is connected to the gap 3.
Adhesive holes 4 are provided that open to the bottom (the number of holes 4 is arbitrary, and the installation position is not limited to only the lower side). Then, from each of these adhesive holes 4 to the gap 3 between the shell 2 and the liner 1, a hot-melt adhesive made of a resin of the same type as the shell 2 is used, and this is applied using a known hot-melt injection device. By spraying the adhesive from the nozzle 5 of the device, the adhesive that has entered the gap 3 from the adhesive through hole 4 flows and expands in all directions around the through hole 4, as illustrated in FIG. Then, the shell 2 and the liner 1 are bonded together as an adhesive layer portion 6a that spreads out in a substantially umbrella shape and is filled, and furthermore, in conjunction with this portion 6a, the entire inner surface of the through hole 4 is applied from the center of the portion 6a. The tubular adhesive layer portion 6b is adhered to the liner 1 side, and both adhesive layer portions 6a, 6
The combined adhesive layer 6 b is formed in a three-dimensional shape and structure covering the inner surface of the shell 2, the outer surface of the liner 1, and the through hole 4, that is, the inside of the liner 1. At this time, the adhesive layer portion 6b in the through hole 4 illustrated in FIG. 3 has a tubular shape, but it can also be glued to fill the entire surface of the through hole 4 to form a columnar shape, if necessary.

According to the structure of the above-described embodiment, conventional adhesives can be inserted into the gap 3 between the inner surface of the cap shell 2 and the outer surface of the cap liner 1 in a filling manner, or adhesives can be bonded by using double-sided tape. In contrast, the adhesive layer 6 is not limited to just a flat spread, but also has an adhesive layer portion 6a that fills the gap 3 between the liner 1 and the shell 2 and connects the liner 1 and the shell 2. Due to the bonding adhesive layer portion 6b, the bonding area is increased in width and length, and the bonding effect is favorably enhanced because of the three-dimensional bonding structure that extends vertically. At this time, since a hot-melt adhesive made of a resin similar to that of the shell 2 is used as the adhesive, reliable integration with the shell 2 can be obtained, and spray adhesion through the adhesive through hole 4 is possible. Its construction is quick and easy. Furthermore, regarding the content of adhesion between the adhesive layer portions 6a, 6b and the liner 1, due to the spray adhesion of the adhesive, there is a gap between the portions 6a, 6b and the foamed resin of the liner 1 as shown in the third figure. Since the fused portion 6c is obtained, the bonding surface is substantially spread and increased, reinforcing the adhesive effect, and the cap liner 1 and the cap are not easily peeled off due to impact, vibration, etc. A strong integration with Ciel 2 is maintained over a long period of time.

(Effect of the invention) According to the invention, the adhesive layer 6 for bonding and integrating the cap shell 2 with the cap liner 1 is formed by using a hot-melt adhesive made of the same type of resin as the target shell. an adhesive layer portion 6a which improves adhesion and is diffused and filled into the gap 3 between the liner 1 and the shell 2 and bonded; and an adhesive through hole in the liner 1 integrally connected with the portion 6a Since the adhesive layer portion 6b bonded to the inside of the adhesive layer 6b forms a vertically continuous three-dimensional bonding structure, the adhesive force is significantly enhanced by increasing the width and length of the bonding surface. The present invention is excellent in that the liner 1 and the shell 2 can be integrated for a long period of time in a robust and firm manner without fear of peeling due to impact, vibration, or the like. Further, in forming the adhesive layer 6, it is sufficient to apply it by spraying from the adhesive through hole 4 and fill it, which is advantageous in that it has good workability and can be processed quickly and easily.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of a main part of an embodiment of the helmet of the present invention, FIG. 2 is a plan view of the adhesive through hole installation side, and FIG. 3 is an enlarged side sectional view of the adhesive layer. 1...Cap liner, 2...Cap shell, 3...
... Gap, 4... Adhesive hole, 6... Adhesive layer, 6
a, 6b...Adhesive layer portion, 6c...fused portion.

Claims (1)

[Scope of utility model registration request] In a cap liner made of a foamed resin material and a cap shell made of a non-foamed resin material, which are integrated by adhesion, there is a gap between the cap liner and the cap shell. A plurality of adhesive holes are provided that communicate with each other, and a hot-melt adhesive made of a resin similar to that of the cap shell is sprayed from each adhesive hole into the gap to create a continuous bond across the through holes and the gap. A helmet characterized in that a cap liner and a cap shell are integrated by an adhesive layer provided on the helmet.