Machine element or mechanism – Gearing – Directly cooperating gears
Patent
1976-04-05
1977-02-01
Scott, Samuel
Machine element or mechanism
Gearing
Directly cooperating gears
280236, F16H 112, B62M 900
Patent
active
040056112
ABSTRACT:
A chainless drive mechanism for a bicycle using a rotatable drive shaft for transferring the pedal actuated driving force from the pedal crankshaft to the rear wheel including shift mechanisms to provide different drive ratios. A pair of discs, each formed with a plurality of concentric series of openings, are mounted on the pedal crankshaft and rear wheel, respectively. A pair of spaced sprocket gears is rotatably mounted on each end of the drive shaft and engaged with a respective series of disc openings. A pair of axially movable ratchet slip gears is fixed against rotation on each end of the drive shaft adjacent a similar ratchet surface formed on each of the sprocket gears. A pair of operator controlled individual shift brackets is movably mounted on the drive shaft, each being operatively engageable with a respective pair of ratchet slip gears. Axial movement of the shift brackets along the drive shaft selectively intermeshes one of the ratchet gears with the ratchet surface of its respective sprocket gear to drivingly connect the front disc with the rear disc through the drive shaft and selected ratchet and slip gears upon rotation of the pedal crankshaft. The intermeshing gears on the rear wheel, slip automatically upon stopping or slowing down of the rotation of the pedal crankshaft and drive shaft, permitting continued rotation of the rear wheel during coasting of the bicycle. Spring means bias return the selected rear wheel ratchet gear into intermeshing driving engagement upon resumption of rotation of the pedal crankshaft.
REFERENCES:
patent: 628614 (1899-07-01), Smallwood
patent: 2561960 (1951-07-01), Weaver
patent: 2780110 (1957-02-01), Kopa
patent: 3782210 (1974-01-01), Holleman
patent: 3872736 (1975-03-01), Houvouras
patent: 3934481 (1976-01-01), Foster
Burke Allan R.
Scott Samuel
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