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
1990-04-16
1993-04-06
Britts, Ramon S.
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 70, 474123, F16H 910
Patent
active
051999293
ABSTRACT:
An electronic, automatic bicycle transmission that compensates gear ratios according to changes in pedaling pressure and pedaling speed.
A drive belt rides upon smooth, cone shaped surfaces at the pedals and rear wheel. Placement of the belt upon the cones is controlled by two roller guides. Speed and pressure sensors located in the front roller guide monitor tension and movement of the drive belt.
The belt speed and pressure information is inputed to a central processing unit. If the values of these parameters fall outside predetermined limits, the central processing unit activates reversible electric motors to move the two roller guides. This changes the location of the belt on the cones, thus altering the apparent diameters and resulting in a more desirable gear ratio. The parameters of pedaling pressure and pedaling speed are then restored to within their predetermined comfort ranges.
REFERENCES:
patent: 3991843 (1976-11-01), Davidson
patent: 4041788 (1977-08-01), Nininger, Jr.
patent: 4061046 (1977-12-01), Lang
patent: 4122907 (1978-10-01), Davidson et al.
patent: 4325702 (1982-04-01), Jacobsson et al.
patent: 4342559 (1982-08-01), Williams
patent: 4373926 (1983-02-01), Fullerton
patent: 4457739 (1984-07-01), Iseman
patent: 4490127 (1984-12-01), Matsumoto et al.
patent: 4605240 (1986-08-01), Clem et al.
patent: 4634406 (1987-01-01), Hufschmid
patent: 4713042 (1987-12-01), Imhoff
patent: 4741546 (1988-05-01), Reswick
patent: 4744577 (1988-05-01), Brent et al.
Popular Science; Dec. 1988; Reference cited of similar concept as applied to automotive technology.
Britts Ramon S.
Schoeppel Roger J.
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