Fifteen speed variable radius bicycle transmission

Details Fifteen speed variable radius bicycle transmission Fifteen speed variable radius bicycle transmission

1987-11-02

1988-11-29

Bui, Thuy M.

Endless belt power transmission systems or components

Pulley with expansible rim means or pulleys with alternately...

Structure for variably adjusting radius of rim section

474 56, F16H 5552

Patent

active

047878797

ABSTRACT:
A fifteen speed bicycle transmissiion wholly located on the rear driving wheel except for a manual control mounted elsewhere, e.g. on the handle bar, and including two closely arranged circular co-axial plates on the hub, one plate being a drive plate with radial slots and the other plate being a cam plate with curved slots, and sprocket elements each located in a combined curved and straight slot for radial adjustment upon rotary motion between plates, and locking member including notches and pawls on the plates at the peripheries thereof and actuated to unlock the plates by the control.

REFERENCES:
patent: 3661024 (1972-05-01), Cooke
patent: 3956944 (1976-05-01), Tompkins

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