Brakes – Vehicle – Velocipede
Patent
1995-08-02
1998-04-14
Graham, Matthew C.
Brakes
Vehicle
Velocipede
188 2421, B62L 108
Patent
active
057381887
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a brake apparatus for a cycle. More particularly, the present invention relates to a brake apparatus for a cycle which is designed so that a support member which protects a brake shoe is operated so as to approach the rim of a wheel of the cycle, thereby pressing the brake shoe against the wheel rim to brake the wheel.
BACKGROUND ART
As a brake apparatus for a cycle, one which is disclosed, for example, in Japanese Utility Model Application Unexamined Publication (KOKAI) No. 3-62238 has heretofore been known. That is, a setting angle adjusting projection is formed on one end portion of a friction surface of a brake shoe, and when the brake shoe is to be attached to a support member, the position of the brake shoe is adjusted so that the adjusting projection on the friction surface and the other end portion of the adjusting projection assume a desired contact posture with respect to a wheel rim of the cycle, that is, the other friction surface with which the brake shoe is brought into contact.
The posture adjustment made by the adjusting projection enables the brake shoe to contact the wheel rim with a predetermined toe-in angle. That is, the surface of the brake shoe and the surface of the wheel rim contact each other at an angle. It is known that, in a case where there is no toe-in angle, that is, where the friction surface of the brake shoe and the friction surface of the wheel rim are in close contact with each other over the entire surface, uncomfortable vibration of the cycle body and noise may be caused by intermittent "stick-slip" motion or the like, whereas, in a case where there is such a toe-in angle, occurrence of uncomfortable vibration and noise can be prevented.
Hitherto, a brake shoe has been formed by using a material mixed with rigid friction particles of aluminum oxide, for example, so that the brakes can be effectively applied by friction created by the rigid friction particles even when the wheel rim is wet because of rainy weather or other reason. The brake shoe of the type which is mixed with rigid friction particles is formed into a predetermined shape by heating a rubber raw material, which has been mixed with rigid friction particles and vulcanized, in a molding die. Therefore, upon completion of the molding of the brake shoe, only the rubber material is present on the surface of the brake shoe, and no rigid friction particles are exposed on the brake shoe surface.
Since the coefficient of friction occurring between the rubber material and the friction surface of the wheel rim is small, the resulting braking force is weak. Therefore, the brake shoe is usually used after the brake shoe surface has been ground with a grinding stone so that rigid friction particles are exposed on the friction surface of the brake shoe. The grinding process enables an increase in the coefficient of friction created between the rigid friction particles and the friction surface of the wheel rim, thus allowing the brake shoe to exhibit satisfactory braking action.
However, when the above-described setting angle adjusting projection is present on the friction surface of the brake shoe, it is necessary to grind the friction surface such that the adjusting projection will not be cut off. Accordingly, the usability of the brake shoe becomes extremely deteriorated. Therefore, the conventional technique cannot practically be utilized for mass-produced articles. In other words, the above-described conventional technique is a toe-in setting technique which cannot be applied to a brake shoe of the type which is mixed with rigid friction particles.
DISCLOSURE OF INVENTION
An object of the present invention is to provide a brake apparatus for a cycle which is designed so that a toe-in angle of a brake shoe can be set with ease and with high accuracy when the apparatus is assembled.
The present invention is a brake apparatus for a cycle in which a support member (1) for a brake shoe (6) is operated to approach a wheel rim (4), thereby pressing the brake shoe (6)
REFERENCES:
patent: 4051924 (1977-10-01), Yoshigai
patent: 4611692 (1986-09-01), Everett
patent: 5320199 (1994-06-01), Min
patent: 5501301 (1996-03-01), Nishimura
patent: 5503252 (1996-04-01), Gelbein
Graham Matthew C.
Shimano Inc.
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