×

Timed switching circuit

  • US 3,988,727 A
  • Filed: 06/24/1974
  • Issued: 10/26/1976
  • Est. Priority Date: 06/24/1974
  • Status: Expired due to Term
First Claim
Patent Images

1. A timed switching circuit for controlling the operation of an appliance comprising in combination:

  • a. means connecting said timed switching circuit to an alternating current power supply;

    b. an alarm timer means providing an audible alarm at predetermined time intervals;

    c. a function timer means connected to said alarm timer means for providing an operational sequence at predetermined time intervals;

    d. a power supply means connected between first and second sides of said timed switching circuit;

    e. an on-delay timing means connected to said power supply means for producing a predetermined time delay before power is applied to said appliance from said alternating current power supply;

    f. power-turn on means connected to said on-delay timing means for turning power on from said power supply means;

    g. an off-delay timing means connected to said function timer means producing a time delay after power is disconnected through said power turn-on means;

    h. a power turn-off means connected to said off-delay timing means for maintaining power during said time delay and subsequently turning off power from said power supply means;

    e. snubber means connected to said power turn-on means to prevent same from turning on momentarily at the beginning of a timing cycle; and

    j. an appliance control/indicator means connected to said appliance for controlling a function and indicating a state of operation of same.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×