Expandible sprocket

Details Expandible sprocket Expandible sprocket

1982-06-11

1985-01-15

Bonck, Rodney H.

Endless belt power transmission systems or components

Positive drive pulley or guide roll

Having axially spaced sets of belt-engaging surfaces

474 49, 474 57, F16H 5530, F16H 5554

Patent

active

044936788

ABSTRACT:
A variable sprocket, particularly suitable for a bicycle transmission, comprising a drive flange and an indexing flange mounted on an axle with a pair of sprocket-segment-planets and at least two idler-planets sandwiched between said flanges forming a relatively rigid variable-sprocket, the planets adapted to expand and contract in response to a relative rotation of the flanges and thereby change the effective diameter of the variable-sprocket.

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patent: 4342559 (1982-08-01), Williams
"Automatic Bike Transmission", Popular Science, Nov. 1980, David Scott, pp. 82-83.
Hagen All-Speed Advertisement.
Fact Sheet: New Tokheim Gear-Maker 5 Speed Bicycle Transmission, Fact Sheet.

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