Bicycle crankset

Details Bicycle crankset Bicycle crankset

1996-08-28

1998-06-30

Schoeppel, Roger J.

Endless belt power transmission systems or components

Control for variable input to output speed-ratio

Including coaxial pulleys shiftable axially to align...

474 78, F16H 906

Patent

active

057725470

ABSTRACT:
A bicycle crankset for mounting a plurality of chainrings includes a crank arm having a first end for mounting a pedal and a second end having a boss for mounting to a crank axle, a chainring retainer for supporting at least one of the plurality of chainrings, and a reinforcement member. The chainring retainer has a first engagement member for engaging the boss, and the reinforcement member includes a second engagement member for engaging the boss. The chainring retainer includes a first center ring defining the first engagement member and a plurality of first arms extending radially outwardly from the first center ring. Similarly, the reinforcement member includes a second center ring defining the second engagement member and a plurality of second arms extending radially outwardly from the second center ring. The distal ends of the plurality of first arms may be connected to corresponding distal ends of the plurality of second arms. Alternatively, the chainring retainer may have a first peripheral ring disposed at distal ends of the plurality of first arms, and the reinforcement member may have a second peripheral ring disposed at distal ends of the plurality of second arms. The first peripheral ring may be secured to the second peripheral ring over a part or whole circumference thereof. To provide good balance of the crankset, the plurality of first arms may be offset from the plurality of second arms by a half-pitch in the circumferential direction.

REFERENCES:
patent: 4331043 (1982-05-01), Shimano
patent: 4380445 (1983-04-01), Shimano
patent: 4869709 (1989-09-01), Nagano
patent: 4916974 (1990-04-01), Kozakae et al.
patent: 5062318 (1991-11-01), Yamazaki
patent: 5067370 (1991-11-01), Lemmens
patent: 5213550 (1993-05-01), Wu
patent: 5246402 (1993-09-01), Romano
patent: 5314366 (1994-05-01), Palm
patent: 5426997 (1995-06-01), Brion
patent: 5480359 (1996-01-01), Tani
European search report for EP 96306658.4, dated Jul. 2, 1997.

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