Power transmission assembly

Details Power transmission assembly Power transmission assembly

1978-10-06

1981-04-14

Dorner, Kenneth

Machine element or mechanism

Elements

Cranks and pedals

74437, 74393, G05G 114

Patent

active

042612233

ABSTRACT:
A pedal powered gear transmission mechanism applicable to velocipedes, exercise machines or winches is disclosed. A system of non-circular gears or a combination of non-circular and circular gears between pedal cranks and a chain driving sprocket causes the pedal cranks to retard and advance cyclically relative to the chain sprocket by varying the instantaneous gear ratio between the pedal cranks and chain sprocket. The resulting change in mechanical advantage partially compensates for the inherent disadvantage at and near dead center pedal positions. A more uniform application of torque is developed.

REFERENCES:
patent: 2131288 (1938-09-01), Kirkpatrick
patent: 2143236 (1939-01-01), Birk
patent: 2482811 (1949-09-01), Traumuller
patent: 2552572 (1951-05-01), Mikina
patent: 3769946 (1973-11-01), Scherrer

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