Electricity: circuit makers and breakers – Retarded – Clock train
Patent
1981-06-08
1983-11-15
Scott, J. R.
Electricity: circuit makers and breakers
Retarded
Clock train
200 27B, 200 39R, H01H 4310
Patent
active
044157851
ABSTRACT:
A timer switch comprises a cam member of a generally disc shape having a cam surface at its periphery. The cam surface is stepped to provide a depressed portion and a shoulder portion adjacent thereto. The cam surface has a notch formed in the shoulder portion and opening to one side of the cam member. The cam member is operatively connected to a motor for rotation. A shaft is mounted on a casing for rotation about and displacement along the axis thereof. The cam member is fixedly mounted on the shaft for rotation therewith. An electrical switching means comprises a pair of first and second contact plates of a resilient material. The first contact plate is biased into sliding engagement with the cam surface. The second contact plate is biased normally into engagement with the first contact plate for energizing the motor to rotate the cam member. Upon depression of the first contact plate into the depressed portion the second contact plate engages the shoulder portion to de-energize the motor. Upon axial displacement of the shaft, the second contact plate is moved into the depressed portion through the notch so that the second contact plate is again biased into engagement with the first contact plate to reset the timer switch.
REFERENCES:
patent: 3823280 (1974-07-01), Obermann et al.
patent: 3824357 (1974-07-01), Brown et al.
patent: 3941000 (1976-03-01), Allison, Jr.
patent: 4123915 (1978-11-01), Stoor
Katumata Saichi
Omata Hiroshi
Tanaka Toshio
Uno Kuniaki
Kabushiki Kaisha Higashifuji Seisakusho
Scott J. R.
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