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APPARATUS FOR SUPPLYING A PREDETERMINED QUANTITY OF ELECTRIC POWER

  • US 3,778,637 A
  • Filed: 12/10/1971
  • Issued: 12/11/1973
  • Est. Priority Date: 06/18/1971
  • Status: Expired due to Term
First Claim
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1. Apparatus for supplying a predetermined measured quantity of electric power to a load comprising an integrating watt-hour meter, a signal transmitter operated by said watt-hour meter for developing an electrical alarm signal only upon the range of consumed power as measured by the integrating watt-hour meter falling between a value smaller than said predetermined quantity and said predetermined quantity, a main power switch connected between said watt-hour meter and said load, chip receiver means for receiving a destructible chip to be inserted into said chip receiver means for actuating the apparatus, alarm means responsive to said electrical alarm signal, means responsive to the insertion of a chip into said chip receiver means for closing said main power switch, means responsive to the insertion of a chip into said chip receiver means for automatically invalidating the destructible chip as a genuine chip, and means responsive to the predetermined measured quantity of electric power being supplied for opening said main power switch in the absence of a new chip being inserted in the chip receiver means.

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