Gear crank for bicycles

Details Gear crank for bicycles Gear crank for bicycles

1978-02-02

1980-05-06

Dorner, Kenneth

Machine element or mechanism

Elements

Cranks and pedals

3081795, G05G 114

Patent

active

042011205

ABSTRACT:
A gear crank for a bicycle, which comprises a crank shaft, a pair of crank arms and a chain gear, is provided with concave and convex portions which are formed at both ends of the crank shaft and extending axially thereof so as to be fitted with concave and convex portions formed at a boss of each of the crank arms respectively, gear-fixing plates each of ring-like shape which have concave and convex portions fitted with the concave and convex portions at the crank shaft and are inserted onto the crank shaft together with the chain gear, and an engagement arranged between the chain gear and gear-fixing plates, so that the chain gear may be fixed to the crank shaft by use of a fixing member for fixing one of the crank arms to the crank shaft.

REFERENCES:
patent: 2277748 (1942-03-01), Duffy

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