Bicycle crank arm

Details Bicycle crank arm Bicycle crank arm

1996-12-20

1999-05-18

Luong, Vinh T.

Machine element or mechanism

Elements

Cranks and pedals

745941, 474160, G05G1/14

Patent

active

059040726

ABSTRACT:
A bicycle crank arm assembly for a bicycle which 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: 4439172 (1984-03-01), Segawa
patent: 4811626 (1989-04-01), Bezin
patent: 5010785 (1991-04-01), Romero
patent: 5179873 (1993-01-01), Girvin
patent: 5197353 (1993-03-01), Trenerry et al.
patent: 5209581 (1993-05-01), Nagano
patent: 5257562 (1993-11-01), Nagano
patent: 5435869 (1995-07-01), Christensen
patent: 5609070 (1997-03-01), Lin et al.
patent: 5623856 (1997-04-01), Durham
patent: 5644953 (1997-07-01), Leng
'96 Shimano Bicycle System Components--Dealer Sales & Support Manual; Aug. 1995; pp. 1, 48 and 92.

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