Bicycle bottom bracket/crank assembly

Details Bicycle bottom bracket/crank assembly Bicycle bottom bracket/crank assembly

1993-09-16

1994-08-09

Focarino, Margaret A.

Land vehicles

Wheeled

Occupant propelled type

745942, 384458, G05G 114

Patent

active

053359283

ABSTRACT:
A bicycle comprises a frame having a sleeve portion adapted to support a bottom bracket/crank assembly and having an annular opening having its axis oriented substantially orthogonally to a vertical-longitudinal center plane of the bicycle, a bearing support ring attached to the sleeve portion in cantilevered relation and having an external bearing seat surface oriented substantially orthogonally to the vertical-longitudinal center plane, and a thin wall large diameter angular contact bearing having an inner race received on the bearing seat surface of the ring. A driving sprocket wheel set having an internal bearing seat surface is received on an outer race of the bearing. A first crank member having a crank arm located on the side of the sprocket wheel set opposite from the frame sleeve portion is fastened to the sprocket wheel set for rotation therewith. A sleeve portion of the first crank member overlies the opening in the sleeve portion. A second crank member having a crank arm located on the side of the frame sleeve portion opposite from the sprocket wheel set includes a sleeve portion overlying the opening in the frame sleeve portion. Fasteners connect the ends of the sleeve portions of the crank members, which abut each other, to each other. The driving sprocket wheel and bearing are offset from the center plane of the bicycle and in line with the driven sprocket wheel, which virtually eliminates lateral torque loads on the bearing due to chain pull.

REFERENCES:
patent: 951137 (1910-03-01), Lowrance

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