Shift mechanism for bicycles

Details Shift mechanism for bicycles Shift mechanism for bicycles

1981-10-19

1984-09-04

Murtagh, John E.

Endless belt power transmission systems or components

Control for variable input to output speed-ratio

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

280238, 74474, F16H 1100, B60K 2002

Patent

active

044694784

ABSTRACT:
A foot-operated mechanism (24) for actuating the rear derailleur (20) of a bicycle. The mechanism senses tension in the drive chain (22) and effects movement of the derailleur actuating cable (74) when driving tension is reduced from the drive chain (22). The actual shift of the derailleur occurs only upon reestablishment of tension in the drive chain (22) by applying a driving force to the pedals. The derailleur cable is connected, through a transfer mechanism (30), to a slotted driven wheel (42) which is normally biased into engagement with drive pins (64a) located on a drive wheel (26) which is attached to the crank mechanism (18) of the bicycle, and is moved out of engagement by a chain-engaging idler sprocket (50) attached to a pivot block (38) on which the driven wheel (42) is mounted.

REFERENCES:
patent: Re30758 (1981-10-01), Lang
patent: 3613466 (1970-06-01), Houghton
patent: 3827312 (1974-08-01), Bristol et al.

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