Machine element or mechanism – Elements – Cranks and pedals
Patent
1999-01-11
1999-11-23
Luong, Vinh T.
Machine element or mechanism
Elements
Cranks and pedals
745941, 474160, D12123, G05G 114
Patent
active
059880163
ABSTRACT:
A bicycle crank arm assembly for a bicycle is designed for mounting a sprocket thereto. The crank arm has a centrally located hub portion, a crank portion extending radially outwardly from the hub portion and at least three fastening fingers extending radially outwardly from the hub portion. The fastening fingers are designed to have substantially the same stiffness at their free ends. This can be accomplished in a variety of ways such as change the cross-section of the fastening fingers adjacent the crank portion or changing the shape of the sprocket mounting portions of the fastening fingers. Also, in certain embodiments, the fastening fingers adjacent the crank portion are constructed such that their rear surfaces lie in the same plane as the rear surface of the crank portion adjacent thereto, or in a lower plane.
REFERENCES:
patent: D299221 (1989-01-01), Borromeo
patent: D319808 (1991-09-01), Cook
patent: D356526 (1995-03-01), Burns
patent: D365049 (1995-12-01), Kuylman
patent: 5609070 (1997-03-01), Lin et al.
patent: 5623856 (1997-04-01), Durham
patent: 5644953 (1997-07-01), Leng
Luong Vinh T.
Shimano Inc.
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