JPS6081307A - Safety hat for rider - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a riding safety band that is used by covering the head when riding a motorcycle, a passenger car, etc., and in particular a plurality of shock absorbing layers provided in contact with the shell of a hard hat. This invention relates to a safety width for riding with a configuration of.

A passenger safety width generally consists of a shell made of hard plastic, and a shock-absorbing layer that is placed in contact with the shell and protects the occupant's head safely in the event of an external impact. Consists of.

Conventionally, the shock absorbing layer in the safety wall of this scale was made of a single layer of foamed polystyrene, etc., and it was difficult to effectively reduce the impact acceleration (n1/'s2) when receiving an external shock. . In addition, in order to suppress the impact acceleration J (J), the impact absorbing layer had to be made thicker than necessary, which resulted in an increase in the volume and weight of the entire safety helmet.

When a shock absorbing layer is made of styrene with a very low expansion ratio (25 to 30 times foamed product), styrene with a high expansion ratio (65
Although the impact acceleration can be slightly reduced compared to the foamed product (~50 times foamed product), the impact coefficient of the shell is lowered and buckling, deformation, etc. are likely to occur.

The present invention aims to prevent the above-mentioned drawbacks of conventional riding safety helmets, reduce impact acceleration without increasing the thickness of the shock absorbing layer, and provide a compact and lightweight safety helmet for riding. .

Therefore, according to the present invention, the shock absorbing layer is changed from the conventional single layer structure to a structure of a plurality of foamed plastic layers, and the plurality of foamed plastic layers have different expansion ratios. With this configuration, the maximum impact value G is effectively reduced when an external impact is received, thereby making the safety helmet compact and lightweight, and protecting the occupant's head reliably and safely. It is.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

The first tooth is shown in a partially cutaway view of an embodiment of a riding hard hat having a layered structure according to the present invention. The safety helmet for riding shown in Fig. 1 is formed to completely cover the head of an occupant, and therefore protects the upper head, the back of the head, and the sides of the head, and the face and chin of the occupant. A window 6 is formed on the front side of the hard hat. A transparent shield 8 is detachably attached to cover the entire window 6,
This shield 8 is pivoted about a pivot 10 so as to be openable. In this manner, while the vehicle is running, the shield 8 is lowered and the window 6 is used with the window 6 covered, thereby protecting the occupant's face from wind pressure and dust.

The cap body 2 is made of hard reinforced plastic, and is provided in contact with a shell body 12 made of laminated glass fibers impregnated with epoxy resin, or an engineering plastic thermoplastic molded shell body 12, and is provided in contact with the inside of this shell body and is It is released from a shock absorbing layer 14 made of foamed plastic that safely protects the occupant's head in the event of an impact.

In contact with the inside of the shock absorbing layer 14, a cloth 18 coated with a urethane foam 16 having excellent hygroscopicity and air permeability is stretched as an interior material. Note that 20 is a chin strap that is fixed to the passenger's chin.

In such a riding safety helmet, the present invention is such that the shock absorbing layer 14 is composed of a plurality of foamed plastic layers 22 and 24, and the foaming ratio of the outer layer is lower than that of the inner layer. By combining two or more shock absorbing layers in this way, it is possible to easily reduce impact acceleration without increasing the thickness.

The shock absorbing layer may include a high-density first layer 22 that is foamed at a foaming ratio of 5 to 15 times, and a low-density second layer 24 that is foamed at a foaming ratio of 15 to 65 times, for example. The thickness of the first layer is, for example, 5 to 10 mm, and the thickness of the second layer is 1 Ovm.

The material of the foamed glass layer, which is the shock absorbing layer, may be polyurethane, ethylene/vinyl acetate copolymer, or polyurethane.

Both the high-density layer and the low-density layer are foams with closed cells, and because these cells are small, the diaphragm becomes thin.
It has flexibility and elasticity, especially rebound resilience, which is not found in conventional bead foam products.

In this way, the high-density layer 22 absorbs part of the energy of the impact, and the low-density layer 24 provided in contact with it absorbs the secondary energy of the impact, resulting in a so-called three-dimensional impact energy absorption effect (elastic deformation). Orgies).

Example Examples of the shock absorbing layer are as follows.

(1) 2-layer example (2) 6-layer example (3) 4-layer example 5 Wholesaler polyethylene 15 times foamed product ] The above examples according to the present invention with multi-layer structure +11, +2
1.

(3) and conventional foamed polystyrene 35 x 25 times thick foam product with single layer structure (4) and 35 x 30 x foamed product (5)
A G value and penetration resistance test based on JIS Ta205 was conducted on the material, and the results were as shown in the following table. Note that glass fiber reinforced FRP, which was created under the same conditions, was used as the safety shell in both cases.

However, the sample had a shell weight of 1100 to 1.12Of.

FIG. 2 is a partial sectional view of the riding safety helmet according to the first embodiment of the present invention after the above-mentioned test based on JIS;
The figure shows the second version of a conventional riding safety helmet made of Styrofoam.
It is a partial sectional view similar to the figure.

As can be seen from the above table and the cross section after the test of the second part 1, the effect on the shell body 12 depends on the impact absorption layer 14. Almost no cracking of the shell 12 was observed even after the durability test.

On the other hand, as is clear from FIG. 6, the conventional single-layer safety structure using Styrofoam 14a as the shock absorption layer produces a crank 26 in the shell 12 for the penetration test, and the Styrofoam shock absorption layer 14a still remains. It was slightly dusty.

The riding safety helmet according to the present invention can effectively reduce the impact acceleration as described above, and has a thickness of approximately 60 mm compared to conventional products.
% thinner, making it more compact and contributing to weight reduction.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of an embodiment of a riding safety helmet according to the present invention, and FIG. 2 is a partial cross-section 1 after a safety penetration resistance test according to the embodiment of the present invention. and FIG. 6 is a partial cross-sectional view similar to FIG. 2 of a conventional safety safety device using a single layer of polystyrene foam as the impact-absorbing layer. 2- Cap body, 4... θ'IJ guard, 8 Shield, 1
2...Shell body, 14...Shock absorbing layer, 22...High density first layer, 24...Low density second layer. Figure 1 Figure 2 G2 Figure 3 B2

Claims (1)

[Scope of Claims] 1. A shell made of hard reinforced plastic, and a shock-absorbing layer provided in contact with the shell to safely protect the head of the occupant in the event of an external impact. 1. A safety width for riding, characterized in that the shock absorbing layer is composed of a plurality of foamed plastic layers having different expansion ratios. 2. Claims in which the shock absorbing layer comprises a high-density first layer foamed at a foaming ratio of 5 to 15 times, and a low-density second layer foamed at a foaming ratio of 15 to 35 times. Safety width for riding as described in Section 1. 6. The safety width for riding according to claim 2, wherein the first layer and the second layer are alternately laminated to form three or four layers. 4. The safety width for riding according to any one of claims 1 to 3, wherein the material of the foamed plastic layer is polyethylene. 5. Any one of claims 1 to 5, wherein the material of the foamed plastic layer is an ethylene/vinyl acetate copolymer.
Safety width for riding as described in section. 6. The safety width for riding according to any one of claims 1 to 6, wherein 11' ff14 of the foamed plastic layer is made of polyurekne.