Derailleur with improved mechanism for moving and retaining a mo

Endless belt power transmission systems or components – Control for variable input to output speed-ratio – Including belt shiftable axially from one to another surface...

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Details

74540, 280236, F16H 722, F16H 906, F16H 1108

Patent

active

043222099

ABSTRACT:
A four link member derailleur for a bicycle, which comprises a fixing member, two linkage members, and a movable member having a chain guide, and a return spring is provided with a control element having a plurality of engageable portions corresponding to the number of speed change stages and with a retainer engageable with each engageable portion at the control element to retain the movable member in a desired speed stage. The control element and retainer cooperate during shifting such that if a stroke of a control cable supported to the retainer is less than a given length, the retainer retains its engagement with each engageable portion, while if the stroke is greater than the given length, the retainer disengages from the engageable portion. A tension spring for stretching the cable and biasing the retainer in the direction of its disengagement from the engageable portions and an energy conservation spring for conserving energy when the cable is pulled to swing the retainer, are used to operate the movable member in rapid traverse-after the retainer disengages from the engageable portions.

REFERENCES:
patent: 3974707 (1976-08-01), Nagano
patent: 4030375 (1977-06-01), Nagano
patent: 4106356 (1978-08-01), Nagano et al.
patent: 4132119 (1979-01-01), Nagano et a.
patent: 4193309 (1980-03-01), Nagano
patent: 4198873 (1980-04-01), Nagano et al.
patent: 4229987 (1980-10-01), Fujimoto

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