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US 4,586,913 AGranted
Front derailleur for a bicycle
AssigneeShimano Industrial Company Limited
InventorMasashi Nagano
Life of this patent
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AssigneeShimano Industrial Company Limited
InventorMasashi Nagano
Estimating the term…
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.
A front derailleur for a bicycle, including a fixing member, a chain guide having an inner plate and an outer plate, a pair of linkage members supporting said chain guide to reciprocate with respect to said fixing member, a return spring including a coiled portion and first and second retaining ends extending therefrom, said return spring biasing said chain guide in a direction of backward movement, a cap having an elastically deformable cylindrical fitting portion fitted onto an outer periphery of said coiled portion of said return spring, said cylindrical fitting portion of said cap having an axially extending slit which is expandable to a width larger than an outer diameter of said coiled portion of said return spring due to elastic deformation of said cylindrical fitting portion, said cap also having a positioning means for positioning said slit adjacent to said inner plate of said chain guide.
Dependencies are inferred from the claim text.