Multi-stage gear crank for a bicycle

Details Multi-stage gear crank for a bicycle Multi-stage gear crank for a bicycle

1978-12-08

1981-04-07

Dorner, Kenneth

Machine element or mechanism

Elements

Cranks and pedals

474160, G05G 114

Patent

active

042598800

ABSTRACT:
A multi-stage gear crank for a bicycle has chain detaching means facilitating disengagement of a driving chain from the teeth of sprockets, the detaching means being provided at teeth positioned in the vicinity of the upper and lower dead points of a larger diameter sprocket corresponding to the crank arms respectively, whereby the chain is adapted to be switched to a smaller diameter sprocket from the larger diameter sprocket at the upper dead point thereof.

REFERENCES:
patent: 3661021 (1972-05-01), Ohshita
patent: 3709053 (1973-01-01), Ohshita
patent: 3772932 (1973-11-01), Nagano
patent: 3956943 (1976-05-01), Yamasaki

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