Patent ID: 6796200
Filing Date: 2004-09-28
Classification: B62M,F16H,Y10T

Abstract:
A bicycle transmission comprising:a transmission housing; an input gear rotatably mounted within the transmission housing; a first cone gear having a plurality of gear surfaces, supported by the transmission housing, driven by the input gear, one of the gear surfaces providing a 1:1 output speed ratio with the input gear, and the other gear surfaces provide output speed ratios less than 1:1 with the input gear; a first ratio-change assembly supported by the transmission housing, operable to selectively engage one of the gear surfaces of the first cone gear; a second cone gear having a plurality of gear surfaces, supported by the transmission housing, driven by the input gear, one of the gear surfaces providing a 1:1 output speed ratio with the input gear, and the other gear surfaces providing output speed ratios greater than 1:1 with the input gear; a second ratio-change assembly supported by the transmission housing, operable to connect the input gear with one of the gear surfaces of the second cone gear; an output gear rotatably mounted within the transmission housing, driven by the input gear through the first cone gear, the first ratio-change assembly, the second cone gear, and the second ratio-change assembly; and a telescopic pedal assembly operably connected to the input gear to drive the input gear, having a pair of fixed arms, a pair of telescopic arms, each telescopic arm being slidably mounted in a corresponding one of the fixed arms, driving means for moving the telescopic arms between an extended position and a retracted position one during each revolution of the pedal assembly, and a pedal carried at the distal end of each telescopic arm for rotating the pedal assembly.