Land vehicles – Wheeled – Occupant propelled type
Patent
1998-05-14
1999-03-09
Hurley, Kevin
Land vehicles
Wheeled
Occupant propelled type
745943, B62M 102
Patent
active
058790179
ABSTRACT:
A new bicycle with improved pedaling efficiency for allowing a length of crank arms to change during pedaling. The inventive device includes a pair of crank shafts secured to opposing ends of an existing sprocket shaft of a bicycle. Each of the crank shafts have an elongated slot extending a length thereof. Each of the crank shafts have a sliding bearing coupled with upper free ends thereof. Each of the sliding bearings have a roller disposed on a rear surface thereof. The rollers are coupled with a pair of circular races. The circular races each have a circular track for receiving the rollers therein. The circular races are coupled with the existing sprocket shafts of the bicycle. A pair of pedals are secured within the elongated slots of the pair of crank shafts. The pair of pedals have interior shaft portions secured to the sliding bearings.
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Hurley Kevin
Zimmerli William R.
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