Pedal crank mechanism for bicycle

Machine element or mechanism – Elements – Cranks and pedals

Reexamination Certificate

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Details

C074S594100, C074S594200, C280S236000, C280S256000

Reexamination Certificate

active

07007570

ABSTRACT:
A bicycle crank mechanism comprises a main crank, a follower crank, and a connecting lever disposed between free ends of the main and follower cranks. A second fixed fulcrum shaft of the follower crank is arranged obliquely upwardly and backwardly of a first fixed fulcrum shaft of the main crank, the follower crank extending downward beyond a line connecting the first and second fixed fulcrum shafts from the second fixed fulcrum shaft such that the second free fulcrum shaft is swung below the line connecting the first and second fixed fulcrum shafts. A pedal is attached to a projection end of the lever and arranged in the vicinity of the free end of the main crank, the pedal being rotated along a non-circular track passing between the first and second fixed fulcrum shafts, and the first fixed fulcrum shaft being located at an internal area of the track.

REFERENCES:
patent: 96208 (1869-10-01), Dayton
patent: 1323004 (1919-11-01), Boyd
patent: 4898047 (1990-02-01), Cropek
patent: 5142937 (1992-09-01), Takahara et al.
patent: 6152471 (2000-11-01), Kang et al.
patent: 6663127 (2003-12-01), Miller
patent: 0 387 382 (1989-03-01), None
patent: 53-66755 (1951-09-01), None
patent: 4-87893 (1992-03-01), None
patent: 11-263275 (1999-09-01), None

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Profile ID: LFUS-PAI-O-3532020

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