Machine element or mechanism – Elements – Cranks and pedals
Patent
1986-04-04
1987-12-29
Smith, Gary L.
Machine element or mechanism
Elements
Cranks and pedals
74750B, 280236, 280238, 280260, B62M 108, F16H 344
Patent
active
047152460
ABSTRACT:
A three-speed planetary transmission which mounts inside the wheel hub concentric with the pedal drive shaft on the axis of the driving wheel of a vehicle such as a tricycle taxi. The transmission is characterized by three planet gears mounted in bearings on a gear carrier fitting driven by the pedal drive shaft. Rotatable sun and ring gears, which can be selectively locked against rotation, are in constant mesh with the planet gears. Conventional free-wheel ratchet mechanisms transfer torque from the sun and ring gears to the wheel hub. Two low gear ratios are provided to facilitate initial movement of a heavily loaded vehicle. The simplified gear shift, low maintenance, and compact nature of this chainless three speed transmission provide an improved alternative to the conventional three-speed chain drive for heavily loaded tricycles.
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DeFranco, Jr. Carl M.
Smith Gary L.
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