Electrical transmission or interconnection systems – Switching systems – Switch actuation
Patent
1991-07-25
1993-11-02
Pellinen, A. D.
Electrical transmission or interconnection systems
Switching systems
Switch actuation
3071414, H01H 4300
Patent
active
052586561
ABSTRACT:
An electronic ON/OFF timer apparatus and method having predetermined time delay intervals. The apparatus is intercoupled between an electrical power source and an electrically powered external device such as a lamp, television, radio, etc. The apparatus generally comprises an electromechanical timer having an ON switch and an OFF switch for enabling approximate ON and OFF times to be selected, a memory for storing a predetermined plurality of randomly varying time delay intervals, and a countdown timer. An operator first selects the approximate ON and OFF times via the switches on the timer. When the approximate ON or OFF time is reached, the countdown timer is loaded from the memory with a first one of the predetermined plurality of randomly varying time delay intervals. The countdown timer then counts down a time period corresponding to the first delay time interval. When the countdown timer times out, the timer is caused to either couple or un-couple electrical power to the external device, depending upon whether the ON or OFF switch was detected, at a first actual time. Accordingly, the actual ON or OFF operation of the external device is delayed a period in accordance with the time delay interval. The invention is particularly well suited to residential applications where the ON and OFF times of electrical appliances such as lights and televisions are desired to be varied in an apparently random fashion within predetermined limits.
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Krishnan Aditya
Pellinen A. D.
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