Timer switch

Details Timer switch Timer switch

1981-08-20

1983-09-27

Grimley, A. T.

Electrical transmission or interconnection systems

Switching systems

Switch actuation

200 38A, 310 41, H01H 700

Patent

active

044069537

ABSTRACT:
A timer switch comprises a drive gear secured to an interval shaft rotatably mounted on a casing. A first clutch gear is rotatably mounted on a bushing which is rotatably mounted on said casing. The first clutch gear is in mesh with the drive gear. A second clutch gear is fixedly mounted on the bushing for rotation therewith and disposed in closely spaced opposed relation to the first clutch gear. The second clutch gear is operatively connected to an electric motor. A slip friction clutch in the form of a flat resilient plate is interposed between and frictionally engages the opposed first and second clutch gears so that the slip friction clutch is deformed into an arcuate cross-section. The slip friction clutch urges the first clutch gear away from the second clutch gear into frictional engagement with the bushing. Upon rotation of the interval shaft, the first clutch gear is rotated independently of the second clutch gear, frictionally moving relative to the slip friction clutch and the bushing whereas upon rotation of the motor, the slip friction clutch connects the first and second clutch gears for rotation in unison.

REFERENCES:
patent: 2603725 (1952-07-01), Dietrich
patent: 3917917 (1975-11-01), Murata
patent: 3975652 (1976-08-01), Hammond

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