Variable speed winch

Details Variable speed winch Variable speed winch

1974-11-08

1976-06-15

Scott, Samuel

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

254150R, F16H 552, B66D 130

Patent

active

039629350

ABSTRACT:
A variable speed winch including a uni-directional drum rotatable initially by the clockwise motion of a handle in a clockwise sense only. The winch also includes a gear selector including a control plate rotatable with respect to the drum into an extreme clockwise position wherein a first gear ratio is selected. The gear selector further includes ratchet structure, splined to a shaft rotatable by the handle. The ratchet structure is slidable axially with respect to the shaft under the influence of a cam structure responsive to the relative angular displacements of the handle with respect to the control plate. The control plate has recesses engageable by respective spring-loaded balls captively supported by the ratchet structure. The balls are adapted to enter and lock within the recesses in response to an anti-clockwise rotation of the handle sufficient to cause axial sliding of the ratchet structure, with respect to the shaft, under the influence of the cam structure. Subsequent clockwise rotation of the handle gives the drum a clockwise speed equal to that of the handle, and subsequent anti-clockwise rotation of the handle causes the drum to continue clockwise rotation at an intermediate higher speed with reference to the handle, up to a point where the control plate is urged into an extreme anti-clockwise position with respect to the drum to select a second gear ratio, whereupon the reversal of the handle and subsequent clockwise rotation thereof causes continued clockwise rotation of the drum at a still higher speed with reference to the handle, and reversal of the handle and subsequent further anti-clockwise rotation thereof causes the drum to revert to the intermediate higher speed while continuing to rotate clockwise.

REFERENCES:
patent: 3656596 (1972-04-01), Morgan
patent: 3670589 (1972-06-01), Carter
patent: 3728914 (1973-04-01), Guangorena et al.
patent: 3799005 (1974-03-01), Koehler
patent: 3802665 (1974-04-01), Fawcett
patent: 3809368 (1974-05-01), Lawrence

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