Bicycle gear shift

Details Bicycle gear shift Bicycle gear shift

1975-05-27

1976-06-29

Wyche, Benjamin W.

Machine element or mechanism

Gearing

Toothed gear and recirculated unconnected elements

74242, 74489, 280236, 116124M, B62M 900, B62M 102, F16H 722, F16H 900

Patent

active

039657639

ABSTRACT:
A ten-speed bicycle gear shift includes front and rear derailleurs actuated by a single continuous cable. Movement of the cable through a discrete given distance in one direction increases the gear ratio and movement of the cable through the same discrete given distance in an opposite direction decreases the gear ratio. A rotatable dial is mounted on the handlebar of the bicycle for easy manual turning and includes a cable drum such that turning the dial in one direction through a given circumferential distance moves the cable through the referred to given distance in one direction and turning of the dial in an opposite direction through the same given circumferential distance moves the cable through the given distance in an opposite direction. Gear numbers and a viewing window are included in the dial structure so that the particular gear position can be visually observed. The gear shift is further characterized by cam arrangements for positively positioning the derailleurs in accordance with movement of the cable to selected positions.

REFERENCES:
patent: 3121575 (1964-02-01), Bourgi
patent: 3901095 (1975-08-01), Wechsler

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