Brakes – Plastic deformation or breakage of retarder element – Crushable element
Patent
1998-11-12
2000-07-11
Butler, Douglas C.
Brakes
Plastic deformation or breakage of retarder element
Crushable element
188371, 188376, F16F 712
Patent
active
060858788
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a resin impact absorber which can be applied to sections requiring the absorption or attenuation of an impact, for example, side walls of roads or wharves, floors or walls of buildings, and impact-attenuating portions of vehicles.
BACKGROUND ART
The conventional impact-absorbing means may include metal springs, friction-type attenuators, hydraulic attenuators, and molded rubber parts. In some cases, these means may be used in any combination. The metal springs, although they have excellent attenuation performance, exhibit almost no impact energy absorption capacity. The friction-type attenuators and hydraulic attenuators are usually complex in structure, and they have a problem that their spring constants have extremely great dependence upon the rate of deformation and these attenuators, therefore, have no restoration.
The molded rubber parts are characterized by their good restoration, but on the other hand, they have a drawback that the material should be used in larger amounts for securing satisfactory impact absorption because of having a low elastic modulus and the member, therefore, has an increased weight and becomes large in size.
As the impact-absorbing means with shaped resin parts, the present inventors have proposed an impact absorber comprising a shaped resin part with cushioning properties, which is provided with two or more arched, domed, or other shaped compression-deformable portions on a perforated or unperforated flat board. The impact absorber, however, has problems that it exhibits small impact energy absorption and it is difficult of application in the case where it should be disposed in a limited space.
As the impact absorber with shaped resin parts, there is disclosed a technique for the production of shaped resin parts, characterized in that hollow shaped parts made of a thermoplastic elastomer are given permanent strain by compression in the axial direction (see Japanese Patent Publication No. 61-12779). The shaped resin parts obtained by this technique, although they have excellent attenuation performance, have a problem that they only exhibit a poor collision energy absorption capacity.
DISCLOSURE OF INVENTION
The present invention has been completed by taking into account the problems of the conventional impact-absorbing means as described above, and the purpose of the present invention is to provide resin impact absorbers with an excellent energy absorption capacity, characterized in that they are small in size and light in weight, and further simple in structure, and they exhibit larger energy absorption as compared with the reaction, and they have rustproofness, water resistance, and weatherability, so that they can be used, free of maintenance, in all places, i.e., on the ground and in the sea.
The resin impact absorbers of the present invention, which can solve the above problems, are as follows:
(1) A resin impact absorber characterized in that it comprises a shaped part having a hollow portion, and the shaped part is made of a resin with a flexural modulus of 500 to 5000 kgf/cm.sup.2 and is designed so that it can absorb impact energy by buckling deformation thereof when it receives the impact energy in the lengthwise direction thereof and the following conditions (a) and (b) can be satisfied in the reaction-compressibility curve at the time of compression in the lengthwise direction of the shaped part:
The embodiments of the present invention may include the following examples.
(2) The resin impact absorber according to the above item (1), characterized in that the shaped part has a cavity portion divided with cell walls, the cavity portion being formed of many penetrating holes interconnecting and opening in the same direction, and the shaped part has a honeycomb section and is designed so that it can absorb the impact energy by buckling deformation of the cell walls in the cavity portion.
(3) The resin impact absorber according to the above item (1), characterized in that the shaped part is a hollow cylindrical b
REFERENCES:
patent: 5746419 (1998-05-01), McFadden et al.
Araki Yoshio
Kamata Sakashi
Matsuyama Yujiro
Negishi Kiyoshi
Nonomura Chisato
Butler Douglas C.
Toyo Boseki Kabushiki Kaisha
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