DE3319736

A gear crank apparatus for a bicycle, comprising a crank shaft, a pair of crank arms, and at least one chain gear. The chain gear has an ellipse-like shape and peripheral teeth located on different pitch diameters, the chain gear being arranged with respect to the crank arms and being coupled therew...

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Bibliographic Details
Main Author NAGANO, MASASHI, IZUMI, OSAKA, JP
Format Patent
LanguageEnglish
Published 28.01.1993
Subjects
CYCLES
LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
PERFORMING OPERATIONS
POWERED PROPULSION OF SLEDGES OR
RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES
TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
TRANSPORTING
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Summary:A gear crank apparatus for a bicycle, comprising a crank shaft, a pair of crank arms, and at least one chain gear. The chain gear has an ellipse-like shape and peripheral teeth located on different pitch diameters, the chain gear being arranged with respect to the crank arms and being coupled therewith, so that when torque produced by a cyclist's leg during pedalling is maximum, the gear diameter for transmitting the torque from the chain gear to a driving chain becomes substantially minimum and when the torque is a minimum, the gear diameter becomes substantially a maximum.
Bibliography:Application Number: DE19833319736