Variable-speed bicycle

Details Variable-speed bicycle Variable-speed bicycle

1979-06-25

1981-07-07

Pekar, John A.

Land vehicles

Wheeled

Occupant propelled type

474 80, B62M 912, B62M 2504

Patent

active

042770777

ABSTRACT:
A variable-speed bicycle comprises a multi-stage freewheel assembly with two or three sprockets mounted on a rear wheel hub, a rear derailleur is adapted to cooperate with the freewheel assembly for switching over a chain from one sprocket onto another, and an action converter is provided for converting a tension force of one direction into a thrust force of a transverse direction thereto. The derailleur comprising a horizontal support shaft mounted to a bracket, a tensioner mounted on the shaft, and a helical spring surrounding the shaft and interposed between the tensioner and the bracket. The tensioner is axially slidable on the shaft as well as rotatable about the shaft under the function of the spring, the action converter comprising a push arm disposed operatively in contact with the tensioner for imparting the thrust force thereto, all of the above constituent elements are housed within a gear case.

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