Rear derailleur for use in bicycles

Details Rear derailleur for use in bicycles Rear derailleur for use in bicycles

1997-07-03

1999-02-02

Hannon, Thomas R.

Endless belt power transmission systems or components

Control for variable input to output speed-ratio

Including belt shiftable axially from one to another surface...

474 80, F16H 900

Patent

active

058656987

ABSTRACT:
An improved rear derailleur for changing the gear ratio of a bicycle is disclosed. It includes a fixed member, a movable member, a parallelogram mechanism connecting the fixed member with the movable member, and a cable adjusting screw which is screwed to a screw socket fixed on the fixed member. The cable adjusting screw is connected to a first end of a cable, wherein the cable has a second end fixed to a movable member. The cam member comprises a guiding surface for guiding the cable between the cable adjusting screw and the movable member. The guiding surface of the cam member is structured substantially coinciding a portion of a fictitious circle centered at a rotating pin which connects an outer linkage of the parallelogram with a second end of the fixed member. Furthermore, the cable adjusting screw is positioned in such a manner that its extension is always substantially tangential to the guiding surface of the cam member, so as to allow the cable to be pulled in a direction substantially coincident with the axial extension of the cable adjusting screw.

REFERENCES:
patent: 3979962 (1976-09-01), Kebsch
patent: 4619633 (1986-10-01), Nagano
patent: 5533937 (1996-07-01), Patterson et al.
patent: 5620384 (1997-04-01), Kojima et al.

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