JPH0546915U - Helmet hat body - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a helmet cap body that is lightweight, safe, and has excellent end characteristics. [Structure] One or more aramid fiber prepreg layers and one or more carbon fiber prepreg layers are laminated, molded and cured, and the circumferential end portion of the cap body is constituted by the carbon fiber layers.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cap body of a helmet (also referred to as a protective cap, a safety cap, etc.).

[0002]

[Prior art and its problems]

 Helmets are widely used in various factories and other workplaces, and certain standards have been established, such as the standards for industrial safety caps under the Japanese Industrial Standards and the standards for protective caps by the Ministry of Labor, to ensure the safety of the wearer. There is.

Although there are various types and shapes, the mainstream is a substantially hemispherical shape made of glass fiber reinforced resin.

[0004] The major problems of the helmets that have been conventionally used are weight and safety against flying and falling objects. Most of the helmets in practical use have a weight of 300 g or more in order to meet the above-mentioned standards, and have a considerable health effect on the human body especially when worn for a long time. In addition, despite the above weight, it cannot be said that safety is sufficient for flying and falling objects, and development of a lighter and safer cap body is desired.

The present inventor has found that these problems can be solved by combining carbon fiber and aramid fiber, but it is known that there are problems such as poor finishing workability at the circumferential end. did.

An object of the present invention is to provide a helmet cap body which is light in weight, particularly excellent in safety against flying / falling objects, and excellent in finish processing characteristics of a circumferential end portion, smoothness, and paintability.

[0007]

Means for Solving the Problems The helmet cap body of the present invention is formed by laminating at least one aramid fiber prepreg layer and at least one carbon fiber prepreg layer, and molding and curing the same, and the circumferential end portion of the cap body is substantially formed. It is characterized by being constituted by an upper carbon fiber layer.

In manufacturing the helmet cap body of the present invention, a carbon fiber prepreg and an aramid fiber prepreg are prepared. A prepreg is a molding sheet in which a fabric such as a woven fabric is impregnated with a thermosetting resin such as an epoxy resin or an unsaturated polyester resin. One or more prepregs are laminated to form a helmet cap body. Molding and curing of resin is performed by heating and pressing using a mold having a shape.

In the present invention, the circumferential end portion (A in FIG. 1) of the Helmet cap body is constituted by the carbon fiber layer instead of the aramid fiber layer. It is made larger than the prepreg so that the outer peripheral end of the laminate is composed of a carbon fiber prepreg layer. In particular, it is preferable to dispose a carbon fiber layer as the outermost layer and increase its size. FIG. 2 is an enlarged cross-sectional view of an end portion, where 1 is a carbon fiber layer and 2 is an amide fiber layer. By increasing the size of the carbon fiber prepreg in the prepreg laminate, the carbon fiber layer covers the end of the aramid fiber layer after molding.

After molding and curing, the cap-shaped molded product taken out from the mold has parison or the like at its end and needs to be finished by sanding, but if aramid fiber is present at the end, the single fiber becomes fluffy. Remains and makes uniformization difficult. On the other hand, if the carbon fiber layer is arranged so as to wrap the aramid fiber at the end, uniform finishing can be easily performed by sanding. In particular, when the outermost layer is a carbon fiber layer and the end length is made longer, the effect is more remarkable, and the physical properties such as strength are maximized and the weight is reduced to the conventional level even for flying and falling objects. It shows a low resistance, and by polishing it gives a flat surface without fluffing, and it is possible to obtain a uniform coated surface with a small amount of paint used.

It is sufficient that the difference in length between the end portions is about 1 to 10 mm.

Example: Helmet using a mold in which prepreg of aramid fiber Kevlar (trade name of DuPont) fabric is sandwiched between two prepregs of carbon fiber trading card (trade name of Toray Industries, Inc.) Molded into a hat body. At that time, the dimension of the carbon fiber layer was set so that the circumferential end portion was longer than the aramid fiber layer by about 5 mm. When the circumferential end of the molded product taken out of the mold was sanded, the single fibers could be easily and neatly finished without forming fluff. On the other hand, when both layers were made to have the same size, fluffy single fibers were generated and the finish processing could not be performed neatly. This helmet cap body weighed 250 g and exhibited stability that was unmatched by conventional products against flying and falling objects.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a helmet cap body.

FIG. 2 is an end cross-sectional view of a helmet cap body.

[Explanation of symbols]

 1 carbon fiber layer 2 aramid fiber layer

Claims (2)

[Scope of utility model registration request] 1. A carbon fiber prepreg layer is formed by laminating at least one aramid fiber prepreg layer and at least one carbon fiber prepreg layer, and is molded and cured. A helmet cap body that is characterized by being. 2. The helmet cap body according to claim 1, wherein the carbon fiber layer constitutes an outermost layer, and an end portion of the outermost layer is longer than an end portion of the aramid fiber layer.