Variable gear ratio chain drive system for bicycles

Details Variable gear ratio chain drive system for bicycles Variable gear ratio chain drive system for bicycles

1977-05-19

1978-12-12

Scott, Samuel

Machine element or mechanism

Gearing

Toothed gear and recirculated unconnected elements

7423018, 7423021, 280236, 74217B, F16H 5512, F16H 5530, F16H 5552, F16H 5554

Patent

active

041290445

ABSTRACT:
A finite range infinitely variable gear ratio chain drive system incorporates a drive sprocket assembly having a plurality of radially displaceable sprocket gears. Each of the sprocket gears is mounted upon a shaft extending intermediate two spaced apart plates. Each shaft has a unique degree of radial displacement and twist intermediate the plates which are, respectively, commensurate with the finite range of effective diametric excursion and resulting change in effective circumference of the drive sprocket assembly. The effective diameter of the drive sprocket assembly is variable by translating the drive sprocket intermediate the fixed plates and forcing the sprocket gears to extend to contract radially along their respective shafts.

REFERENCES:
patent: 395816 (1889-01-01), Dustin
patent: 498613 (1893-05-01), Black et al.
patent: 563399 (1896-07-01), Musgreave
patent: 792220 (1905-06-01), Johnston

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