Bicycle gear crank assembly

Details Bicycle gear crank assembly Bicycle gear crank assembly

1990-11-26

1991-11-05

Luong, Vinh T.

Machine element or mechanism

Elements

Cranks and pedals

745941, G05G 114

Patent

active

050623184

ABSTRACT:
A bicycle gear crank assembly includes a crank having a boss portion fittable to a crank shaft, and a chainwheel mounted on the crank boss portion. The chainwheel includes a largest sprocket and at least one smaller sprocket coaxial with the largest sprocket. The crank boss portion is provided with backup arms located on the side of the largest sprocket laterally away from the smaller sprocket. The backup arms extend radially outward from the crank boss portion to contact the largest sprocket radially outwardly of the crank boss portion, so that the backup arms prevent the largest sprocket from laterally bending in a direction away from the smaller sprocket.

REFERENCES:
patent: 3919898 (1975-11-01), Sugino
patent: 4009621 (1977-03-01), Segawa
patent: 4259880 (1981-04-01), Ueno
patent: 4425824 (1984-01-01), Koch
patent: 4439172 (1984-03-01), Segawa
patent: 4583422 (1986-04-01), Boyd
patent: 4594910 (1986-06-01), Nagano
patent: 4793208 (1988-12-01), Bregnard et al.

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