Machine element or mechanism – Mechanical movements – Rotary to intermittent unidirectional motion
Patent
1984-09-06
1986-04-01
Staab, Lawrence J.
Machine element or mechanism
Mechanical movements
Rotary to intermittent unidirectional motion
74160, F16H 2912
Patent
active
045790140
ABSTRACT:
A sequential ratchet drive for an appliance timing cam is disclosed. The drive includes a pawl adapted to drive ratchet teeth located on the periphery of a main program cam in a step-by-step manner. The pawl is driven and guided by cams against and with the bias of springs in an initial tangential drive path in driving engagement with a ratchet tooth. The cams guide the pawl out of engagement with the driven tooth in a curvilinear retraction path with the bias of a first spring and against the bias of a second spring to a raised location and then the pawl is returned to its initial driving position by the bias of both springs. A portion of the path of travel of the pawl from its raised location to its initial position may be defined by a portion of a ratchet tooth so that the retraction path of the pawl may adapt itself to a variety of varying tooth spacings.
REFERENCES:
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patent: 2552457 (1951-05-01), Raskin
patent: 2618196 (1952-11-01), Mitchell
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patent: 3475974 (1969-11-01), Brosseit
patent: 3818769 (1974-06-01), Tigner et al.
patent: 4032055 (1977-06-01), Costa
Holt, "Ratchett Drive Mechanism", IBM Technical Disclosure Bulletin, vol. 8, No. 6, p. 902, Nov. 1965.
Staab Lawrence J.
The Scott & Fetzer Company
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