Crank and spider assembly for bicycle

Details Crank and spider assembly for bicycle Crank and spider assembly for bicycle

1991-07-31

1993-03-30

Braun, Leslie A.

Machine element or mechanism

Elements

Cranks and pedals

745942, 280261, 280260, G05G 114

Patent

active

051973537

ABSTRACT:
A one-piece crank arm for a bicycle is machined from high strength aerospace aluminum 7075-T6. One end of the crank arm has a threaded boss to be fastened in threads of an associated spider. The opposite end of the crank arm has a ball with a passage therein for connecting a pedal. The passage in the ball has a closed end and an axis which extends at a slight angle with respect to the axis of the threads of the boss. For weight reduction, elongated grooves are formed on opposite surfaces of the crank arm.

REFERENCES:
patent: 529110 (1894-11-01), Copeland
patent: 4425824 (1984-01-01), Koch
patent: 4441383 (1984-04-01), Segawa
patent: 4594910 (1986-06-01), Nagano
patent: 4608878 (1986-09-01), Shimano
patent: 4704919 (1987-11-01), Durham
patent: 5010785 (1991-04-01), Romero

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