Electricity: circuit makers and breakers – Retarded – Clock train
Patent
1987-01-21
1988-06-21
Scott, J. R.
Electricity: circuit makers and breakers
Retarded
Clock train
200 38F, H01H 4310
Patent
active
047526564
ABSTRACT:
An electric power control switch for controlling heating temperature of a heating element such as an electric heater wherein a triangular cam groove is formed and a timing cam driven by a motor rotates the cam between a stationary piece and a movable piece carrying contacts. The electric power can be turned on and off by controlling the engagement of contacts on the two pieces. The contacts are positioned on contact strips. The cam arrangement includes a contact band-type cam follower for one of the contact strips; the control cam optionally connects electrical contacts for driving the timing cam. A guide pin for the contact carrying strips and the control cam interact to adjust the time period of engagement and disengagement between the contacts for the power supply to a heater by properly setting the timing cam spacing between the contacts for the heater.
REFERENCES:
patent: 2402404 (1946-06-01), Hodgkins
patent: 3047684 (1962-07-01), Heerdt
patent: 3234805 (1966-02-01), Slonneger
patent: 3368042 (1968-02-01), Lace
patent: 3823280 (1974-07-01), Obermann et al.
patent: 4060702 (1977-11-01), Linn
patent: 4675478 (1987-06-01), Song
Kookje Elec. Ind. Co., Ltd.
Scott J. R.
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