Variable transmission with an integral shifter

Details Variable transmission with an integral shifter Variable transmission with an integral shifter

1987-12-23

1989-03-07

Bui, Thuy M.

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Patent

active

048102350

ABSTRACT:
A variable transmission with an integral shifter, particularly suitable for a bicycle, having a variable-sprocket mounted on an axle having crank-arms. The variable-sprocket comprises a drive-flange and a indexing-flange, a pair of sprocket-segment-planets and at least a pair of idler-planets connected to the flanges, the planets adapted to expand and contract in response to a relative rotation of the flanges and thereby increase and decrease, respectively, the effective diameter of the variable-sprocket; and the sprocket-segment-planets are arranged along an imaginary line defined by the crank-arms.

REFERENCES:
patent: 2421368 (1947-06-01), Aubert
patent: 3995508 (1976-12-01), Newell
patent: 4493678 (1985-01-01), Husted

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