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
1990-10-26
1991-07-30
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
745941, 280215, 474 69, F16H 5530
Patent
active
050356780
ABSTRACT:
The present invention is an energy-storing bicycle sprocket drive system which includes a crank which rotates a shaft about the shaft's longitudinal axis. The crank moves through a point of minimum applied leverage and a point of maximum applied leverage in each rotational cycle. Journalled to the shaft is a drive plate having an outer surface with at least one opening. Each opening has an inner surface with at least one end wall. Facing the drive plate is a wheel which rotates freely on the shaft. At least one drive peg is mounted to the wheel such that it is in a position parallel to the longitudinal axis of the shaft. The drive peg extends from the wheel and into the opening of the drive plate. A spring is mounted within the opening between the end wall and the drive peg. As the shaft rotates and the spring is in a compressed state, it stores energy while exerting a first force on the drive peg causing the wheel to revolve as the crank rotates 90 degrees from the point of maximum applied leverage. Whereby as the crank then rotates 90 degrees from the point of minimum applied leverage the spring releases energy, transforms into an extended state, and applies a second force on the drive peg which maintains the wheel's motion.
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patent: 4961719 (1990-10-01), Wildermuth
Bui Thuy M.
Trilach Development Inc.
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