Fluid-controlled bicycle transmission

Details Fluid-controlled bicycle transmission Fluid-controlled bicycle transmission

1995-09-13

1997-09-16

Schoeppel, Roger J.

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Fluid pressure actuator for adjustment of member

474 29, 474 70, F16H 5900

Patent

active

056674490

ABSTRACT:
A multi-speed transmission is provided which employs inflatable diaphragms to alter drive ratio. Particularly applicable to bicycles, the transmission is composed of a diaphragm mounted at the pedal axis and another mounted at the drive wheel axis, with a nylon drive belt connecting the two. These diaphragms are each inflated and deflated by way of pressurized cylinders mounted on the bicycle. Pedaling of the bicycle turns the pedal axis diaphragm which, in turn, drives the rear wheel diaphragm via a nylon drive belt. Pressure tubes carry the pressurized fluids from each of the cylinders to their respective diaphragm. Standard shifter mechanisms are used each of which, when moved, moves a piston within one of the cylinders, changing the pressure in that cylinder and the inflation of its respective diaphragm.

REFERENCES:
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patent: 2378634 (1945-06-01), Hussey
patent: 2956443 (1960-10-01), Nelson
patent: 4201094 (1980-05-01), Rathmell
patent: 4889354 (1989-12-01), Wen
patent: 4955247 (1990-09-01), Marshall
patent: 5228354 (1993-07-01), Oosterwal et al.
patent: 5251504 (1993-10-01), Summerville, Jr. et al.
patent: 5342075 (1994-08-01), Williams

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