Endless belt power transmission systems or components – Pulley with expansible rim means or pulleys with alternately... – Structure for variably adjusting radius of rim section
Patent
1989-07-19
1990-10-09
Bui, Thuy M.
Endless belt power transmission systems or components
Pulley with expansible rim means or pulleys with alternately...
Structure for variably adjusting radius of rim section
474 56, F16H 5552
Patent
active
049617192
ABSTRACT:
A drive transmission for work producing mechanism, such as a bicycle or other vehicle, in which a carrier member is mounted on a rotatable crank shaft and has a plurality of spaced, pivotally mounted segments, with each segment carrying a rotatable drive element, such as a chain-engageable sprocket. An endless, flexible member, such as a roller chain, is coupled with the sprocket, each segment being in mesh with a free-wheeling gear rotatably mounted on the crank shaft. A chain takeup damper is carried in spaced relationship to the crank shaft and applies tension to a part of the chain at all times. As torque requirements on the crank shaft increase, the other part of the chain increases in tension causing the sprockets to be rotated toward the crank shaft to increase the drive ratio of the transmission. A resilient endless flexible band biases the segments outwardly of the crank shaft and into a maximum drive ratio. A servo system can be used to cause changes in the drive ratio which are dependent upon crank shaft speed instead of torque on a crank shaft.
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Bui Thuy M.
Gruber, Kaplan & Associates
LandOfFree
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