Bicycle gearing system

Endless belt power transmission systems or components – Control for variable input to output speed-ratio – Including belt shiftable axially from one to another surface...

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Details

280261, F16H 5900

Patent

active

056721331

ABSTRACT:
In combination, a bicycle having a frame and front and rear wheels and a bicycle gearing system which includes a movable bottom bracket mounted on the frame of the bicycle. A pedal axle is rotatably mounted in the bottom bracket. A chain extends between the front gear sprocket and a selected one of the rear gear sprockets. A rear derailleur is mounted on the frame generally adjacent and forward of the rear gear sprockets, the rear derailleur operative to engage the chain and shift the chain transversely relative to the frame. The chain is of a size and shape such that when the bottom bracket is in a forward position, the chain is tensioned, and when the bottom bracket is in the rearward position, the chain is detensioned. The chain is detensioned and the rear derailleur shifts the chain transversely relative to the frame such that the chain engages a different selected one of the rear gear sprockets. The movable bottom bracket is then returned to the forward position thereby retensioning the chain and retaining the chain on the different selected one of the rear gear sprockets.

REFERENCES:
patent: Re30078 (1979-08-01), Harris
patent: 550629 (1895-12-01), Cowe
patent: 573230 (1896-12-01), Monkiewicz
patent: 907289 (1908-12-01), Robinson
patent: 2560991 (1951-07-01), Schuricht
patent: 4164153 (1979-08-01), Moritsch et al.
patent: 4857036 (1989-08-01), Romano
patent: 5356348 (1994-10-01), Bellio et al.
patent: 5389043 (1995-02-01), Hsu
patent: 5392668 (1995-02-01), Nurnberger

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