Dual pedal crank assembly for bicycle

Details Dual pedal crank assembly for bicycle Dual pedal crank assembly for bicycle

1978-01-10

1979-10-23

Peters, Jr., Joseph F.

Land vehicles

Wheeled

Occupant propelled type

745941, 403355, 403379, B62M 102

Patent

active

041718224

ABSTRACT:
A dual pedal crank assembly for a bicycle or the like has a shaft defining a shaft axis and having a pair of ends one of which is flatted and tapered axially away from the other end. This one end further forms a locking surface lying substantially in a plane inclined to the shaft axis and forming therewith an acute angle pointed toward the other shaft end. A fixed crank cast integrally with the shaft lies on and defined a fixed-crank axis generally perpendicular to the shaft axis. A removable crank extending along a removable-crank axis is formed with a recess centered on a recess axis generally perpendicular to the removable-crank axis, and complementarily shaped to the one end of the shaft so that this one end can be received in the recess with the removable-crank and shaft axes aligned. The crank is further formed with a bore centered on a bore axis spaced from the recess axis and lying in a plane generally perpendicular to the recess axis. A tapered key is receivable in this bore and has a flat face flatly engageable with a locking surface of the one end of the shaft. A nut carried on the end of the key may be to draw the locking surface and flat face of the key tightly together so as to lock the removable crank tightly on the shaft end.

REFERENCES:
patent: 939933 (1909-11-01), Trautner
patent: 1006895 (1911-10-01), Albree
patent: 2017123 (1935-10-01), Harbert
patent: 2350468 (1944-06-01), Kraeft

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