JPH09176908A - Cap body for helmet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve shock attenuating performance without especially increasing thickness of a liner in a cap body of a helmet consisting of a shell and a liner. SOLUTION: In this a cap body for a helmet, a liner 7 consists of an outer liner 7a made of a low expanded synthetic resin excellent in external force dispersing function and an inner liner 7b which is made of a highly expanded synthetic resin excellent in external force absorbing function and is engaged with the inside of the outer liner 7a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helmet cap used mainly by motorcycle and automobile occupants.
More particularly, the present invention relates to an improvement including a shell and a liner made of a foamed synthetic resin fitted to an inner surface of the shell.

[0002]

2. Description of the Related Art When a cap body having such a structure receives an impact force, the impact force is dispersed in a wide range due to the high rigidity of the shell to reduce the pressure applied to the liner as much as possible, and the pressure applied to the liner is reduced. It absorbs by compressive deformation and exerts shock-damping performance. Conventionally, in order to improve the shock-damping performance, the wall thickness of the liner has been increased.

[0003]

However, when the wall thickness of the liner is increased, there is an adverse effect that the size of the shell, that is, the size of the cap body is inevitably increased.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a hat body of the above-mentioned helmet which can improve the impact damping characteristics without increasing the wall thickness of the liner. And

[0005]

In order to achieve the above object, the present invention provides a liner, which is an outer liner made of a low-foam synthetic resin, fitted to the inner surface of a shell, and a liner fitted to the inner surface of the outer liner. The first feature is that the inner liner is made of a highly foamed synthetic resin.

In addition to the above characteristics, the present invention has a second characteristic that ρa> 0.06133 and ρb <0.0648, where ρa is the specific gravity of the outer liner and ρb is the specific gravity of the inner liner. .

Further, in addition to the first or second feature, the third feature of the present invention is that the outer dimension of the inner liner is set to be equal to or larger than the inner dimension of the outer liner.

Further, in addition to the first, second or third feature of the present invention, in the wall thickness reduced portion where the wall thickness decreases toward the lower end of the liner, a step protruding outward to the lower end of the inner liner. A fourth feature is that a portion is formed and the lower end surface of the outer liner is brought into contact with or opposed to the upper surface of this step portion.

Furthermore, the present invention provides the first, second or third embodiment.
In addition to the features described above, in the wall thickness reduced portion where the wall thickness decreases toward the lower end of the liner, the lower end of the outer liner ends above the lower end of the inner liner, and the outer surfaces of the inner and outer liners are formed substantially continuously with each other. This is the fifth feature.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on embodiments of the present invention shown in the drawings.

1 to 5 show a first embodiment of the present invention. FIG. 1 is a front view of a full-face type helmet for riding a motorcycle in a semi-longitudinal direction, and FIG. 2 is a sectional view taken along line 2-2 of FIG. 3 is an exploded perspective view of the liner of the same helmet, FIG. 4 is a side view of the main liner, and FIG. 5 is a sectional view taken along line 5-5 of FIG.

Referring to FIGS. 1 and 2, a full-face type helmet H includes a cap body 1 having a chin cover portion 1a immediately below a front window hole 2 and a window supported by both left and right side walls of the cap body 1. And a shield 3 for opening and closing the hole 2.

The cap body 1 comprises a shell 4 formed by injection molding of synthetic resin, and a foam synthetic resin liner 5 fitted on the inner surface of the shell 4. A flexible pad 6 is attached to an appropriate place on the inner surface of the liner 5. The chin belt 9 is riveted to the shell 4.

As shown in FIGS. 2 and 3, the liner 5 is
It is divided into a main liner 7 according to the present invention fitted on the inner surface of the dome-shaped main portion of the shell 4 and a chin liner 8 fitted on the inner surface of the chin cover portion 1a of the shell 4. The main liner 7 is divided into an outer liner 7a fitted to the inner surface of the shell 4 and an inner liner 7b fitted to the inner surface of the outer liner 7a. The shell 4 and the outer liner 7a, and the outer liner 7a and the inner liner 7b are separated from each other. ,
In a bonding area A behind the second ventilation hole 12 to be described later,
Each is bonded to each other with an adhesive.

The outer liner 7a has a specific gravity ρa of 0.
A relatively low expansion ratio is given at the time of molding so as to exceed 0613, and the inner liner 7b has a specific gravity ρ
A relatively high expansion ratio is given during molding so that b is less than 0.0648. At that time, ρa and ρ
b is set to satisfy ρa / ρb ≧ 1.111.

The outer dimensions of the inner liner 7b are set to be the same as or slightly larger than the inner dimensions of the outer liner 7a.

Specific examples of materials for the outer and inner liners 7a and 7b are shown in the table below.

[0018]

[Table 1]

The front wall of the cap body 1 has one or a plurality of first ventilation holes 11 penetrating therethrough, and the upper wall has one or a plurality of first ventilation holes penetrating it. Second ventilation holes 12 are provided respectively. And the first ventilation hole 11
A shutter 13 for opening and closing is attached to the shell 4, and a control plate 14 that can selectively apply a dynamic pressure or a negative pressure of traveling wind to the second ventilation hole 12 when the motorcycle is traveling is also attached to the shell 4. .

Outer liner 7a and inner liner 7b
Has no undercut on the inner surface of the lower opening, which facilitates die-cutting during molding. On the other hand, the shell 4 has an undercut on the inner surface of the lower opening, that is, since the opening is slightly narrowed,
In the case of the full face type, as shown in FIG. 4 and FIG.
The thickness of the side portion of the main liner 7 toward the rear is inevitably reduced toward the lower end. In such a reduced-thickness portion 7r, a step portion 15 protruding outward is formed at the lower end portion of the inner liner 7b, and the lower end surface of the outer liner 7a abuts on the upper surface of the step portion 15 or faces with a small gap. Thus, the outer liner 7a is formed.

The operation of this embodiment will be described.

If an impact force is applied to the cap body 1 of the helmet H of the present invention, the impact force is first dispersed in a wide range by the high rigidity of the shell 4 and transmitted to the outer liner 7a. This outer liner 7a is made of foamed synthetic resin, but its specific gravity is set to a relatively high value of more than 0.06133, so that the impact force received from the shell 4 is appropriately absorbed, and the outer liner 7a is dispersed in a wider range, and the inner liner 7a 7b. In this way, the impact force is dispersed and absorbed over a wide range in two stages, so the pressure applied from the outer liner 7a to the inner liner 7b is low, and the specific gravity is 0.0
Inner liner 7b made of high-foam synthetic resin that is less than 648
Is easily deformed by compression and effectively absorbs the pressure.
Thus, good impact damping performance can be exhibited and the user's head can be protected from impact force without increasing the wall thickness of the liner 2 in particular.

Here, the specific gravity of the outer liner 7a is 0.0
It is specified that it exceeds 6133 because its specific gravity is 0.06.
If it is 133 or less, the hardness of the outer liner 7a becomes too low and the necessary external force dispersion function cannot be obtained, and the specific gravity of the inner liner 7b is specified to be less than 0.0648 because the specific gravity is 0.0648 or more. Then,
This is because the hardness of the inner liner 7a becomes too high and the external force absorbing function cannot be sufficiently obtained.

In the concrete example 1 of the above table, the foamed PP forming the outer and inner liners 7a and 7b has a relatively stable compressive strength and hardness even at high and low temperatures. Outer liner 7
“A” can exhibit a desired external force dispersing function, and the inner liner 7b can exhibit a desired external force absorbing function, so that good shock damping performance can be obtained as a whole.

In Example 2, the foamed PS forming the outer and inner liners 7a and 7b can maintain sufficient compressive strength and appropriate hardness even at high temperatures, but at the time of low temperature the hardness becomes high for the inner liner 7b. ,
Good external force dispersion and absorption function can be exhibited in a high temperature state, but improvement in external force absorption function is small in a low temperature state.

In Specific Example 3, the low-foamed PP forming the outer liner 7a has a relatively stable compressive strength even at high and low temperatures and can always exhibit a good external force dispersion performance, but constitutes the inner liner 7b. Highly foamed PS tends to have high hardness at low temperatures.

In Example 4, the low-foam PS forming the outer liner 7a has an excellent external force dispersion function even at high and low temperatures, and the high-foam PP forming the inner liner 7b.
Since it always exhibits a stable external force absorbing function at high and low temperatures, it is possible to obtain good shock damping performance as a whole in both high and low temperatures.

Incidentally, the foamed PP has a stronger deformation recovery property than the foamed PS.

In assembling the cap body 1, first the shell 4
The outer liner 7a is individually fitted to the inner surface and bonded in the bonding area A, and then the inner liner 7b is press-fitted to the inner surface of the outer liner 7a and bonded in the bonding area A. By doing so, the outer and inner liners 7a and 7b have a small wall thickness by themselves and are relatively easily bent and deformed.
It can be easily fitted to each of the shells 4 having a narrowed lower opening, and the second ventilation hole 12 for the adhesive is also provided.
Can be prevented from entering. Moreover, the inner liner 7
Since the outer diameter dimension of b is set to be equal to or larger than the outer dimension of the outer liner 7a, the inner liner 7b exerts a wedge effect on the outer liner 7a during press fitting, so that the shell 4, the outer liner 7a, and the inner liner 7 are formed.
It is possible to prevent the main liner 7 from rattling by closely contacting the respective facing surfaces of b.

In particular, the fitting portions of the inner liner 7b and the outer liner 7a are highly airtight, but the first and second
Since the ventilation holes 11 and 12 are provided, they serve as air vent holes, so that they can be fitted smoothly and tightly. Moreover, the second ventilation hole 12 on the upper wall of the cap body 1
Since the shell 4, the outer liner 7a, and the inner liner 7b extend in the fitting direction, the positioning pin P should be inserted into the second ventilation hole 12 from the outside of the shell 4 during the fitting, as shown in FIG. Thereby, the three parties 4, 7a, 7b can be easily and surely fitted to each other in a fixed position.

Further, as the inner liner 7b, several types having different internal dimensions are prepared, and by combining these with the outer liner 7a having the same size, several types of cap bodies 1 of different sizes can be easily obtained. To be

Furthermore, the wall thickness reduced portion 7 of the inner liner 7
In r, the step portion 15 protruding outward is formed at the lower end portion of the inner liner 7b, and the lower end surface of the outer liner 7a is brought into contact with or opposed to the upper surface of the step portion 15, so that the inner liner 7b and the outer liner 7a are individually separated. It is not necessary to extremely reduce the wall thickness of each liner 7 due to excessive wall thickness reduction.
It is possible to prevent lowering of the strength of the lower end portions of a and 7b.

6 to 9 show a second embodiment of the present invention. FIG. 6 is a front view of a jet type helmet for riding a motorcycle in a semi-longitudinal direction, and FIG. 7 is a sectional view taken along line 7-7 of FIG. 8 is an exploded perspective view of the liner, and FIG. 9 is a side view of the liner.

The cap body 1 of this helmet H has the lower edge of the window hole 2 open, that is, the chin cover 1a as in the previous embodiment.
Not equipped. The liner 7 of the cap body 1 is divided into an outer liner 7a fitted to the inner surface of the shell 4 and an inner liner 7b fitted to the inner surface of the outer liner 7a, like the main liner 7 of the previous embodiment.

Thus, in this embodiment, the outer liner 7a is made of a low-foaming polyvinylidene chloride resin and the inner liner 7b is made of a high-foaming polyvinylidene chloride resin.
As a result, the heat insulating properties and mechanical characteristics of the liners 7a and 7b can be made stable regardless of temperature changes.

Further, on the rear wall of the liner 7, there is a reduced thickness portion 7r having a reduced thickness toward the lower end, and at the portion 7r, the lower end of the outer liner 7a ends above the lower end of the inner liner 7b, and The outer surface of the outer liner 7a and the outer surface of the inner liner 7b are formed so as to be continuous with each other and conform to the inner surface of the shell 4. By doing so, the inner liner 7b and the outer liner 7 in the reduced thickness portion 7r are formed.
It is possible to suppress an extreme decrease in the individual wall thickness of a and prevent the strength of each liner 7a, 7b from being reduced due to an excessive decrease in wall thickness.

The other structure is almost the same as that of the previous embodiment.
In the figure, parts corresponding to those in the previous embodiment are designated by the same reference numerals.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, the material of the shell 4 is PP
(Polypropylene), A / EPDM / S (acrylonitrile / ethylene propylene diene / styrene), P
A (polyamide), ABS resin, FRP, PC (polycarbonate), PET (polyethylene terephthalate), PS, etc. can be used, and the material of the liner 5 is PP, PS, polyvinylidene chloride resin,
ABS resin, PE (polyethylene), A / EPDM /
S, PA, etc. can be used.

[0039]

As described above, according to the first feature of the present invention, an outer liner made of a low-foam synthetic resin is fitted to the inner surface of the shell, and a high liner is fitted to the inner surface of the outer liner. Since it is composed of an inner liner made of foamed synthetic resin, the outer liner's external force distribution function and the inner liner's external force absorption function interact with each other without increasing the wall thickness of the liner.ゝ,
It is possible to improve the impact damping performance of the cap body. Also, since the outer and inner liners each have a small wall thickness and are relatively easily bent and deformed, they can be easily fitted to a shell with a narrowed opening in order, and the assemblability is improved. Is improved. Furthermore, by preparing several types of inner liners having different internal dimensions and combining these with an outer liner having the same dimensions, several types of cap bodies having different sizes can be easily obtained, which can contribute to cost reduction.

Further, according to the second feature of the present invention, when the specific gravity of the outer liner is ρa and the specific gravity of the inner liner is ρb, ρa> 0.06133 and ρb <0.0648, so that it is suitable for the outer liner. The external force dispersion function and the excellent external force absorption function can be surely given to the inner liner.

According to the third feature of the present invention, the outer dimensions of the inner liner are equal to the inner dimensions of the outer liner,
Alternatively, since the inner liner is set larger than that, the opposing surfaces of the shell, the outer liner, and the inner liner can be brought into close contact with each other by the wedge effect of the inner liner with respect to the outer liner, and the rattling of the liner in the shell can be prevented.

Further, according to the fourth feature of the present invention, in the thickness reduced portion where the wall thickness decreases toward the lower end of the liner, a step portion protruding outward is formed at the lower end portion of the inner liner, and this step is formed. Since the lower end surface of the outer liner is brought into contact with or opposed to the upper surface of the section, it is possible to suppress the extreme decrease in the individual wall thickness of the inner liner and the outer liner in the section where the wall thickness is reduced and prevent the strength of each liner from being reduced due to the excessive wall thickness reduction. be able to.

Furthermore, according to the fifth feature of the present invention,
In the wall thickness reduced part where the wall thickness decreases toward the lower end of the liner,
Since the lower end of the outer liner ends above the lower end of the inner liner and the outer surfaces of the inner and outer liners are formed substantially continuously with each other, this also prevents the reduction in strength due to excessive wall thickness reduction of each liner.

[Brief description of the drawings]

FIG. 1 is a semi-longitudinal sectional front view of a full-face type helmet according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is an exploded perspective view of the helmet liner.

FIG. 4 is a side view of the main liner.

FIG. 5 is a sectional view taken along line 5-5 of FIG. 4;

FIG. 6 is a semi-longitudinal sectional front view of a jet-type helmet according to a second embodiment of the present invention.

FIG. 7 is a sectional view taken along line 7-7 of FIG. 6;

FIG. 8 is an exploded perspective view of the liner.

FIG. 9 is a side view of the liner.

[Explanation of symbols]

 H Helmet 1 Hat body 4 Shell 7 Liner 7a Outer liner 7b Inner liner 7r Wall thickness reduction section 15 Step section

Claims (5)

[Claims] 1. A helmet cap body comprising a shell (4) and a liner (7) made of foamed synthetic resin fitted on the inner surface of the shell (4). 4) An outer liner (7a) made of a low-foam synthetic resin fitted to the inner surface of 4) and an inner liner (7b) made of a high-foam synthetic resin fitted to the inner surface of the outer liner (7a). And
Helmet cap body. 2. The outer liner (7a) according to claim 1, wherein the specific gravity is ρa, and the inner liner (7a) is
A hat body of a helmet, characterized in that ρa> 0.06133 and ρb <0.0648, where ρb is the specific gravity of b). 3. The outer liner (7b) according to claim 1, wherein the outer dimensions of the inner liner (7b) are the same as those of the outer liner (7b).
A cap body of a helmet, which is set to be equal to or larger than the internal dimension of a). 4. The wall thickness reducing portion (7r) according to claim 1, 2 or 3, wherein the wall thickness is reduced toward the lower end of the liner (7), and the outer wall is provided outside the lower end of the inner liner (7b). A hat body of a helmet, characterized in that a step portion (15) projecting to is formed, and a lower end surface of the outer liner (7a) is brought into contact with or opposed to an upper surface of the step portion (15). 5. The wall thickness reducing portion (7r) according to claim 1, 2 or 3, wherein the wall thickness is reduced toward the lower end of the liner (7), the lower end of the outer liner (7a) is connected to the inner liner (7b). ), And the outer surfaces of the inner and outer liners are formed substantially continuously with each other, and the cap body of the helmet.