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System for coordinating operation of microwave oven with a second appliance

  • US 5,521,359 A
  • Filed: 04/18/1995
  • Issued: 05/28/1996
  • Est. Priority Date: 04/18/1995
  • Status: Expired due to Fees
First Claim
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1. A control system for coordinating the operation of a microwave oven with that of a second electrical appliance wherein the microwave oven and the second electrical appliance withdraw electrical power for operation from a single electrical power outlet and wherein the microwave oven includes a pair of electrical contacts across which a voltage differential is generated when the microwave oven is in operation and a power cord through which electrical power is conducted to the electrical contacts from the single power outlet, the control system comprising:

  • wiring connected between the second electrical appliance and the microwave oven for conducting electrical operating power to the second electrical appliance by way of the power cord; and

    relay means having a normally-closed switch which is connected in line with the wiring connected between the second electrical appliance and the microwave oven and including a coil connected across the electrical contacts of the microwave oven and responsive to the voltage differential generated across the contacts during microwave oven operation so that as long as the microwave oven is operating, the switch of the relay means prevents electrical power to be withdrawn by the second electrical appliance through the wiring so that the power needs of the second electrical appliance yield to the power needs of the microwave oven and as long as the microwave oven is not operating, the switch of the relay means permits electrical power to be withdrawn by the second electrical appliance through the wiring.

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