Gear crank for a bicycle

Details Gear crank for a bicycle Gear crank for a bicycle

1981-02-05

1986-07-08

Smith, Gary L.

Machine element or mechanism

Elements

Cranks and pedals

474160, 474162, 74448, G05G 114, F16H 5512, F16H 5506

Patent

active

045986088

ABSTRACT:
A gear crank for a bicycle, which comprises a plurality of chain gears and a pair of crank arms, in which some teeth of a larger diameter chain gear among the chain gears are positioned within a range of its center angles of 30.degree. and 60.degree., forward and rearward respectively in the driving revolution direction of each crank arm at both circumferential sides of a portion at the larger diameter chain gear. The portion corresponding to each crank arm, and the teeth are formed of a material superior to the material of the chain gear body in rigidity, the rigid teeth being formed for easily engaging with a driving chain.

REFERENCES:
patent: 1115557 (1914-11-01), Livermore
patent: 4009621 (1977-03-01), Segawa
patent: 4181033 (1980-01-01), Nagano
patent: 4384865 (1983-05-01), Ueno

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