Endless belt power transmission systems or components – Control for variable input to output speed-ratio – Including belt shiftable axially from one to another surface...
Patent
1990-06-11
1991-07-23
Bui, Thuy M.
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 80, F16H 1108
Patent
active
050339915
ABSTRACT:
An automatic derailleur shifter system for example for a bicycle includes a hub to which is attached a chain wheel set and a derailleur system for moving the chain associated therewith from chain wheel to chain wheel for a gear changing system. Within the hub associated with the chain wheels is provided an automatic changing system including a member coupled to the chain wheel set which carries a helical screw cooperating with a sleeve slidable axially within the hub and cooperating with the screw so that rotation of the screw relative to the sleeve causes the sleeve to move axially. Axial movement of the sleeve is inhibited by a spring and rotational movement of the sleeve is prevented by engagement with the hub. Thus variations in the torque applied from the chain set to the hub through the screw in the sleeve cause axial movement of the sleeve which actuates change of the gears by moving to the derailleur set. The spring can be internal to the hub or can be provided outside of the hub. In addition movement of the sleeve can cause rotational movement of a second screw member at an opposed end of the hub which can be used to change a front chain wheel set at the pedals.
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patent: 4599079 (1986-07-01), Chappell
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patent: 4840605 (1989-06-01), Testa
Ade Stanley G.
Battison Adrian D.
Bui Thuy M.
Thrift Murray E.
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