Electrical transmission or interconnection systems – Switching systems – Switch actuation
Patent
1974-05-15
1976-04-06
Smith, Jr., David
Electrical transmission or interconnection systems
Switching systems
Switch actuation
119 5, 315360, H01H 700, H01H 4300
Patent
active
039492419
ABSTRACT:
The apparatus has a potentiometer electrically interpositioned between an inlet and an outlet for attenuating and increasing the level of electrical power conducted therebetween. The potentiometer has a depending control knob which is cyclically and repeatedly engaged by motordriven sectors. Accordingly, in a given time frame one sector turns the control knob gradually to provide progressively increasing electrical power. This sequence is followed by a quiescent period in which the increased power remains available. Next, another sector turns the control knob gradually to diminish and finally to cut off power. This diminution of power, too, occurs over a given time frame, and is followed by a quiescent period in which power remains cut off. Subsequently, and automatically, the gradual, power-increasing period follows. The apparatus has an especial utility for use with an aquarium, albeit not limited to such an application, for simulating the occurrence of sunrise and nightfall.
REFERENCES:
patent: 777116 (1904-12-01), Louis
patent: 1736474 (1929-11-01), Williamson
patent: 2180047 (1939-11-01), Griffin
patent: 2467910 (1949-04-01), Reckard
patent: 2478343 (1949-08-01), Trask
patent: 2843111 (1958-07-01), Roll
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