Incremental timer drive mechanism

Details Incremental timer drive mechanism Incremental timer drive mechanism

1988-06-09

1989-09-12

Scott, J. R.

Electricity: circuit makers and breakers

Retarded

Clock train

74125, 200 38R, H01H 708, F16H 2912

Patent

active

048662240

ABSTRACT:
An incremental drive mechanism for a switch operating timing cam is disclosed. The mechanism includes a camshaft having a radially extending cam and a cooperating slide which is adapted to reciprocate along a rectilinear path. The slide has first and second cam surfaces which are engaged during a major portion of a single revolution of the camshaft to reciprocate the slide in a positive manner. The slide has a cantilever spring arm which carries a pawl tooth at its end to engage successive teeth provided on the periphery of a switch operating cam drum or disc. A cantilever leaf spring is provided which bears against the slide to urge the pawl tooth into engagement with the cam disc or drum in the event the cantilever spring arm becomes permanently displaced toward the slide.

REFERENCES:
patent: 2703347 (1955-03-01), Constantine
patent: 2736204 (1956-02-01), Hill
patent: 3738185 (1973-06-01), Wooley
patent: 4319101 (1982-03-01), Bolin
patent: 4579014 (1986-04-01), Malone
patent: 4760219 (1988-07-01), Daniell et al.

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