| 摘要 |
A bicycle frame with a down tube, seat mast, and rear fork has a crank hanger in the form of an open bottomed bell having substantially planar front, top and rear surfaces substantially perpendicular to long axes of the lower ends of the down tube, seat mast and rear fork respectively and parallel to end surfaces thereof, the end surfaces squarely butting the respective bell surfaces and being secured thereto. A crank bearing assembly is readily mounted in the crank hanger, and held therein with a single cotter pin, permitting easy demounting as well. The axle shaft of a crank is journaled in bearings mounted in housings of a size to fit closely within an enlarged portion of key hole slots in opposite parallel side walls of the bell, but too large to pass through neck portions of the key hole slots.
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