JP2000054217A - Composite helmet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite helmet capable of further improving the impact resistance and light weight of a helmet comprising a plastic or a metal by detachably attaching or fixing a hollow molded product to a helmet main body. SOLUTION: This lightweight composite helmet is obtained by attaching or fixing a hollow truncated pyramidal molded product to the outer surface of a helmet main body comprising a plastic or a metal. The hollow truncated pyramidal molded product is obtained by cutting off the central portion of a hollow truncated pyramidal molded product in a constant width nipping the central line of the bottom surface in the direction vertical to the bottom surface and subsequently integrally bonding the obtained pieces to form the laterally symmetric combined product.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helmet body made of plastic or metal, which is cut at a constant width perpendicular to the bottom surface of a truncated pyramid so that the outer shape follows the helmet shape. A polygonal truncated pyramid shape which is joined and integrated so as to be symmetrical and has a horizontal cross section of 4
When a high-speed flying object is received from the outside by attaching or fixing a symmetrical truncated pyramid-shaped hollow molded product consisting of polygons of polygons or more, the energy of the flying object is partially destroyed by the truncated pyramid-shaped molding. Absorbs, effectively prevents damage to the helmet body and bulges of the inner surface, has good impact resistance against high-speed flying objects, and has a bilaterally symmetrical pyramidal truncated pyramid shaped as close as possible to the shape of the helmet body The present invention relates to a composite helmet which is made of a molded product, and therefore has a small volume and a small thickness and is lightweight and detachable.

[0002]

2. Description of the Prior Art It is now well known that helmets can be impact resistant to objects falling from high places or flying objects. However, when the impact force is large, it is often impossible to reduce the impact force with a helmet alone, and there are also cases where the ceramic is fixed through a hollow truncated pyramid shaped product (spacer), but it is always When I was wearing it, I felt heavily lacked operability. Also, once the ceramic with the truncated pyramid shaped molding is fixed to the helmet, it is difficult to remove it later, and even if there is no danger of falling objects with large impact force or objects flying at high speed, the weight is large. I had to wear my helmet all the time.

[0003]

SUMMARY OF THE INVENTION The inventor of the present invention has proposed a method in which the outer surface of a helmet body made of plastic or metal is fixed at a constant angle perpendicular to the bottom surface with the center line of the bottom surface of the truncated pyramid sandwiched by the outer surface of the helmet. By mounting or fixing a truncated polygonal pyramidal shape that is cut out in width and joined and integrated so as to be bilaterally symmetric, and whose horizontal cross-section is a quadrilateral or more polygonal polygonal truncated pyramidal shape. Even if a strong impact force is applied, the breaking energy is transmitted to the helmet through this hollow molded product, so the impact force on the helmet body made of plastic or metal is alleviated and the bulge on the inner surface of the helmet is effectively prevented. Completes a lightweight composite helmet with excellent impact resistance and a symmetrical truncated pyramid-shaped hollow molding that is close to the helmet shape. And it has reached.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a helmet made of plastic or metal, which is hollow on the outer surface of a helmet main body and sandwiches the center line of the bottom of the truncated pyramid so that the outer shape follows the outer shape of the helmet. A truncated polygonal pyramid shape that is cut perpendicularly to the bottom with a constant width and joined and integrated so as to be bilaterally symmetric, and whose horizontal cross-section is a quadrilateral or more polygonal polygon , A hollow molded article) is mounted or fixed. In the present invention, the hollow molded article is a molded article having a hollow portion penetrating vertically. Preferably, the present invention relates to a composite helmet, wherein the inner surface of the hollow molded article has the same shape as the outer surface of the helmet body. Preferably, the composite helmet has a combined pyramidal truncated pyramid shape in which two or more types of truncated pyramids are stacked so that their ridges coincide with each other so that the outer shape of the hollow molded product is along the outer shape of the helmet body. Is about. Further, the present invention relates to a composite helmet in which the hollow molded product has a laminated structure of two or more layers made of the same material or different materials, and further, the longitudinal direction of the hollow molded product is the front-rear direction of the helmet body,
The present invention relates to a composite helmet in which the lateral direction is the left-right direction of the helmet main body, and further relates to a composite helmet in which this hollow molded product is divided into two or more divided bodies, and these are combined to form a hollow molded product. More preferably, the present invention relates to a composite helmet wherein the hollow molded article is detachably mounted or fixed to the helmet body.

The helmet body used in the present invention may be any helmet which is generally called a helmet, but is preferably a construction safety helmet, a riding safety helmet, a schoolchild safety helmet, and an impact-resistant helmet. Hats, bulletproof caps, etc. The helmet body is made of plastic or metal. As the material of the plastic, all materials used for manufacturing a helmet are applicable, and preferably, a material composed of a single resin such as ABS, polycarbonate and polyethylene, a mixture thereof and a composite layer of two or more types, or A material composed of a resin and a reinforcing material, such as a simple substance of FRP (general glass fiber, nylon fiber and polyester fiber reinforced plastic) and ACM (advanced composite material, that is, high-strength fiber reinforced plastic) or a composite thereof. . On the other hand, the material of the metal is not particularly limited, but is preferably a simple substance such as titanium, titanium alloy, soft iron, high-strength steel sheet, stainless steel, aluminum or duralumin, an alloy thereof, and a composite thereof.

In the above-mentioned ACM, the high-strength fiber used has a specific tensile strength obtained by dividing the tensile strength by the density of 10%.
× 10 ⁸ cm or more, and specific elastic modulus obtained by dividing elastic modulus by density is 2.5 × 10 ⁸ cm or more. Specifically, examples thereof include high-strength glass fiber, aramid fiber, aromatic polyester fiber, high-strength polyethylene fiber, high-strength nylon fiber, and polyparaphenylenebenzobisoxazole (commonly called PBO) fiber. General glass fiber, nylon fiber, polyester fiber, etc. are not applicable. When a fiber having a specific tensile strength or a specific elastic modulus equal to or less than the above value is used, the impact resistance of the helmet body is not always sufficient. On the other hand, the resin to be impregnated or coated on these high-strength fibers is usually a thermosetting resin such as a phenol resin, an epoxy resin, a polyurethane resin, an unsaturated polyester resin, a vinyl ester resin and a polyimide resin;
Alternatively, thermoplastic resins such as polyolefins such as polyethylene and polypropylene, polyamides, polyesters, polyvinyl acetate, polyether ether ketone, thermoplastic polyurethanes, and thermoplastic elastomers, and synthetic rubbers are used.

In order to obtain ACM, in the case of a thermosetting resin,
A prepreg is prepared by impregnating or coating a high-strength fiber with a thermosetting resin, a plurality of prepregs are stacked, and a compression molding method in which heat and pressure are applied, or a hand lay-up method in which a prepreg is not formed is used. Resin content is 5-80
% (% By weight, hereinafter the same) can be used, but usually 5 to 50%, preferably 5 to 50% for excellent impact resistance.
30%. In the case of a thermoplastic resin, a high-strength fiber is usually impregnated or coated with a thermoplastic resin solution, powder or a dispersion thereof to prepare a prepreg, and a plurality of prepregs are stacked and heated and pressed by a hot plate or a heating roll. There is a compression molding method and the like. At this time, the content of the resin is 5 to 80%.
(% By weight, the same applies hereinafter), but usually 5 to 50
%, Preferably 5 to 30% for excellent impact resistance. If it is less than 5%, it is difficult to make prepreg,
Even if it exceeds 80%, it is difficult to produce a prepreg, and the impact resistance is reduced.

On the other hand, the hollow molded article is a molded article made of a thermosetting or thermoplastic resin such as FRP, ACM or a resin alone or a metal, and has a high surface hardness.
It is desirable to have high mechanical strength characteristics including impact strength, weather resistance, and light weight. Typical plastics include phenolic resins, epoxy resins, unsaturated polyester resins, vinyl ester resins, and urethane resins as thermosetting resins; polycarbonate resins, acrylic resins, ABS resins, polyethylene resins as thermoplastic resins. It is a simple substance such as a polypropylene resin or a composite thereof. As fibers and resins used for FRP and ACM, those used for the helmet body are generally used. Similarly, as the metal, a material used for the helmet body is generally used.

In the composite helmet of the present invention, the hollow molded article mounted or fixed on the outer surface of the helmet main body has a constant width perpendicular to the bottom surface across the center line of the base of the truncated pyramid so that the outer shape follows the outer shape of the helmet. The shape is a truncated polygonal pyramid shape cut out and joined so as to be bilaterally symmetric, and the horizontal cross section is a bilaterally symmetric truncated pyramid shape composed of a polygon of four or more. By adopting such a shape, the appearance of the molded product is very close to the shape of the helmet body, and the thickness of the molded product is relatively uniform, so that necessary impact resistance is secured and weight reduction is achieved. . As for the shape of the hollow molded product, it is preferable that the inner surface has the same shape as the outer surface of the helmet body. In this case, the hollow molded article can be mounted on the helmet body without any gap, and therefore, the impact resistance of the composite helmet is further improved, the stability at the time of mounting the hollow molded article is good, and the operability is excellent. Become.

It is preferable that the hollow molded article is divided into two or more parts, which are combined in a truncated pyramid shape and mounted on the helmet body. In this case, when not mounted, the volume of the divided body becomes compact, which is convenient for carrying. The divided bodies are usually detachably mounted and fixed to the helmet body, but it is preferable that the contact portions of the adjacent divided bodies have an appropriate overlapping structure. Furthermore, the impact resistance is usually improved by forming the hollow molded article into a laminated structure of two or more kinds of the same material or different materials, for example, a material having excellent impact strength and weather resistance on the surface. By using a light-weight helmet that has little deformation on impact inside and has a good impact resistance and weather resistance as a whole, a lightweight helmet can be obtained. Further, the hollow molded product is formed of two or more types of hollow truncated pyramids,
It is also possible to form an integrated structure in which these ridges are vertically overlapped so as to form a stagger.

As a method of fixing the hollow molded article obtained by the above method to the helmet main body, the inner surface of the hollow molded article and the surface of the helmet main body may be fixed to the resin used for the hollow molded article or a synthetic rubber-based material. Or an adhesive such as epoxy resin or urethane resin or an adhesive such as a double-sided tape, or a method of attaching a magic tape to the inner surface of the hollow molded article and the surface of the helmet body and fixing the both. In some cases, mechanical joining using bolts, rivets, or the like is also possible. The simplest method of attachment and detachment is to simply fit them together, or to fix and join a magnet or magic tape to the hollow molded article and the helmet body.

The composite helmet thus obtained is
For example, when an object with a large impact force or a high-speed flying object collides, the hollow molded article first breaks down, and the collision object that lost energy rapidly and the fragments of the hollow molded article reach the helmet main body, so the helmet main body The direct impact is small, the swelling on the inner surface of the helmet due to the impact is small, and it is possible to hardly damage the head. In addition, since the hollow molded article can be detachably attached to the helmet body, it is attached when necessary, and removed when not needed, to reduce the load on the head and to reduce the burden on the head, and to improve operability during use. Can be greatly improved. Furthermore, by making the hollow molded article symmetrical, the balance when mounted on a helmet can be improved, which is important in terms of function and operability.

Hereinafter, specific examples of the composite helmet of the present invention will be described with reference to the drawings. Figure 1 shows the outer surface of the helmet body,
A hollow octagonal truncated pyramid shape that is hollow and cut out at a constant width perpendicular to the bottom face across the bottom center line of the truncated pyramid so that the outer shape follows the outer shape of the helmet, and joined and integrated symmetrically Shows the case where an object is attached, (a) is a side view,
(b) is a plan view, (c) is a constant width (T) of a central portion of a regular pyramid.
FIG. 4D is a plan view when the plane is cut symmetrically into a vertical plane, and FIG. 4D is an octagonal pyramid-shaped plan view in which the pyramids (W) remaining after the cutting are combined to be symmetrical. In FIG. 1, 1 is a helmet main body, and 2 is an octagonal pyramid hollow molded article. FIG.
Is a case in which the hollow molded product divided into four is fixed to the helmet main body, 1 is a helmet main body, and 3 is a divided body of a hollow truncated pyramid-shaped molded product. FIG. 3 shows a case where an integral octagonal truncated pyramid hollow molded article obtained by combining four divided truncated pyramid-shaped hollow molded articles is mounted on a helmet main body. It is a divided body. FIG. 4 shows a state in which an octagonal truncated pyramid hollow molded article obtained by stacking two types of truncated pyramid hollow molded articles so that their ridges coincide with each other so that the contour of the molded article conforms to the contour of the helmet body is attached to the helmet. 1 is a helmet body, and 6 is an integral octagonal pyramid hollow molded article. FIG. 5 shows a state in which an octagonal truncated pyramid hollow molded article obtained by stacking and integrating two types of two-part truncated pyramid hollow molded articles each along the outer shape of the helmet body so that their ridges coincide with each other is mounted on the helmet. 1 is a helmet body, and 7 and 8 are each a divided body of a truncated square pyramid hollow molded article. FIG.
Is an octagonal truncated pyramid hollow molded product that is formed by stacking two types of truncated pyramid hollow molded products made of dissimilar materials along the outer shape of the helmet main body so that their ridges coincide with each other. Shows the mounted state, 1
Is a helmet body, and 9 and 10 are octagonal pyramid hollow moldings of different materials, respectively. FIG. 7 shows a case where a combined pyramid truncated pyramid hollow molded article integrally stacked and integrated vertically so that the ridge lines of the two types of hollow pyramid truncations become tangled along the outer surface of the helmet,
1 is a helmet body, 11 is two kinds of truncated hollow pyramids 12 and 13.
Are combined so as to form a plover structure. FIG. 8 shows a case in which a frustum of a pyramid is integrally mounted on a helmet body by stacking vertically so that the ridge lines of the three kinds of frustums of the pyramid coincide with each other. Frustum 15,16 and 17
It is a one-piece truncated pyramid hollow molded product.

[0014]

As is clear from the above description, the composite helmet of the present invention has excellent impact resistance against objects falling from high places or objects flying at high speed, and has a hollow structure. By making the molded article detachable, operability can be improved. Further, the hollow molded article attached or fixed to the outer surface of the helmet body is cut at a constant width perpendicular to the bottom face across the bottom center line of the truncated pyramid so that the outer shape follows the outer shape of the helmet, and becomes symmetrical. The shape of the molded product is very similar to the shape of the helmet body, and the thickness of the molded product can be equalized. Can be achieved.

[Brief description of the drawings]

FIG. 1 shows a case where a hollow molded article having a bilaterally symmetrical octagonal pyramid shape is mounted on the outer surface of a helmet body, (a) is a side view, (b) is a plan view, and (c) is a central portion of a regular pyramid. The constant width
(D) A plan view when the plane is cut symmetrically into a vertical plane in (T), (d)
FIG. 4 is an octagonal pyramid-shaped plan view in which the pyramids (W) remaining after being cut off are combined so as to be symmetrical.

FIG. 2 shows a case where a hollow molded product divided into four parts is fixed to a helmet body, (a) is a side view, and (b) is AA.
It is sectional drawing.

FIG. 3 shows a case where an integral octagonal pyramidal hollow molded product obtained by combining four divided truncated pyramid-shaped hollow molded products is mounted on a helmet body, (a) is a side view, and (b) is a plan view.

FIG. 4 shows a case where a frustum of an octagonal pyramid is formed by stacking two types of truncated pyramid hollow molded products so that their ridges coincide with each other and is attached to a helmet body, (a) is a side view, (b) is an AA cross-sectional view, and (c) is a plan view.

FIG. 5 shows a case where an octagonal truncated pyramid hollow molded product obtained by stacking and integrating two types of two-part truncated pyramid hollow molded products such that their ridges coincide with each other is mounted on a helmet body, and (a) Is a side view, (b) is an AA cross-sectional view,
(C) is a plan view.

FIG. 6 shows a case where an octagonal truncated pyramid hollow molded product made by laminating two types of frustum pyramid hollow molded products made of two kinds of different materials is attached to a helmet body, (a) is a side view,
(B) is an AA sectional view, and (c) is a plan view.

FIG. 7 shows a case in which a combination of two types of hollow pyramid truncated pyramid is formed by stacking them so that their ridge lines are staggered to each other and attached to a helmet body, and (a)
Is a side view, and (b) is an AA cross-sectional view.

FIG. 8 shows a case where a frustum of a pyramid is integrally mounted on a helmet body by stacking three types of frustums of a pyramid so that ridges thereof coincide with each other, and FIG. 8 (a) is a side view,
(B) is AA sectional drawing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Helmet main body 2 Octagonal truncated pyramid hollow molded article 3 Divided body of hollow truncated pyramid shaped molded article 4, 5 Divided body of truncated pyramid hollow molded article 6 Octagonal truncated pyramid hollow molded article 7, 8 Divided body of truncated pyramid hollow molded article 9,10 Octagonal truncated pyramid hollow molding 11,14 Pyramidal pyramid hollow molding 12,13,15,16,17 Hollow pyramid truncation

Claims (7)

[Claims] 1. A helmet made of plastic or metal, which is hollow on the outer surface of a helmet body and has a constant width perpendicular to the bottom surface across a bottom center line of the truncated pyramid so that the outer shape follows the outer shape of the helmet. It is characterized by mounting or fixing a truncated polygonal pyramidal shape which is cut and joined so as to be bilaterally symmetrical, and has a laterally symmetrical truncated pyramid shape having a horizontal cross section formed of a polygon of four or more. Composite helmet. 2. The composite helmet according to claim 1, wherein the inner surface of the molded product has the same shape as the outer surface of the helmet body. 3. The shape according to claim 1, wherein two or more kinds of truncated pyramids are used so that the outer shape of the molded product follows the outer shape of the helmet body, and the shapes are stacked and integrated so that their ridges coincide with each other. Composite helmet. 4. A molded product having a laminated structure of two or more layers made of the same material or different materials.
The composite helmet as described. 5. The composite helmet according to claim 1, wherein the longitudinal direction of the molded article is the front-rear direction of the helmet body, and the lateral direction is the left-right direction of the helmet body. 6. The composite helmet according to claim 1, wherein the molded product is a combination of two or more divided bodies. 7. The helmet body according to claim 1, wherein said molded article is detachably mounted or fixed to said helmet body.
The composite helmet as described.