Machine element or mechanism – Gearing – Toothed gear and recirculated unconnected elements
Patent
1976-09-22
1979-05-15
Scott, Samuel
Machine element or mechanism
Gearing
Toothed gear and recirculated unconnected elements
192 64, F16H 1108, F16H 5530
Patent
active
041541235
ABSTRACT:
A drive for a bicycle provided on the side of its pedals with a freewheel of two or more front chain sprockets, in which the rotational resistance of a rear multiple freewheel in its free rotation is larger than that of the front freewheel in its free rotation so that a driving chain may, even when pedalling is stopped in running of the bicycle, travel across both the front and rear freewheels for changing speed. The drive utilizes a force F.sub.1 of an energizing spring for a chain guide cage of a rear derailleur which is respectively larger than a resistance F.sub.2 applied to the chain in speed change by a front derailleur, and a rotational resistance F.sub.3 of the rear freewheel.
REFERENCES:
patent: 3492883 (1970-02-01), Maeda
patent: 3709053 (1973-01-01), Ohshita
Henderson William R.
Scott Samuel
Shimano Industrial Company Limited
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