B - Operations – Transporting – 62 – M
Patent
B - Operations, Transporting
62
M
B62M 25/02 (2006.01) B62M 9/12 (2006.01)
Patent
CA 2084665
2084665 9119638 PCTABS00008 An automatic derailleur shifter system for example for a bicycle includes a hub (11) to which is attached a chain wheel (16) 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 (47) cooperating with the screw so that rotation of the screw relative to the sleeve (34) causes the sleeve to move axially. Axial movement of the sleeve is inhibited by a spring (78) 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 (60, 70) at an opposed end of the hub which can be used to change a front chain wheel set at the pedals.
Ade & Company
Mclaren Michael J.
LandOfFree
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