Front derailleur for a bicycle

Details Front derailleur for a bicycle Front derailleur for a bicycle

1984-08-16

1986-05-06

Levy, Stuart S.

Endless belt power transmission systems or components

Control for variable input to output speed-ratio

Including belt shiftable axially from one to another surface...

474 82, F16H 924, F16H 1108

Patent

active

045869138

ABSTRACT:
A front derailleur for a bicycle includes a chain guide reciprocably supported to a fixing member through a pair of linkage members. The chain guide has a pair of inner and outer plates opposite to each other and a coiled return spring interposed between the chain guide and either the fixing member or the linkage member. The return spring biases the chain guide in the direction of backward movement. A cap is provided to cover the spring to protect it from debris. The cap includes an elastically deformable cylindrical fitting portion to be fitted onto the coiled portion of the return spring. The cylindrical fitting portion has an axially extending slit which enables the cap to be fitted on the outer periphery of the coiled portion through expansion of the slit. The cap includes structure for positioning the cap such that the slit is adjacent to the inner plate of the chain guide.

REFERENCES:
patent: Re31854 (1985-03-01), Egami
patent: 2601753 (1952-07-01), Zipf
patent: 4078444 (1978-03-01), Huret
patent: 4199853 (1980-04-01), Fricker

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