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Priority relay circuit with timer

  • US 5,831,345 A
  • Filed: 10/18/1995
  • Issued: 11/03/1998
  • Est. Priority Date: 10/18/1995
  • Status: Expired due to Fees
First Claim
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1. A relay circuit comprising:

  • a power source;

    a first relay switch operable between a first and a second position;

    a secondary relay switch connected to the first relay switch, the secondary relay switch being connected to the power source when the first relay switch is in the first position;

    at least one secondary load device connected to the secondary relay switch;

    a secondary control device connected to the secondary relay switch to operate the secondary relay switch between a first and a second position, such that power is supplied to the secondary load device only when the secondary relay switch is in the first position and the first relay switch is in the first position;

    a priority load device connected to the first relay switch, the priority load device being connected to the power source when the first relay switch is in the second position;

    a priority control device connected to the first relay switch, the priority control device controlling the position of the first relay switch; and

    a priority timer circuit interposed between the priority control device and the first relay switch, wherein the priority timer circuit is activated by the priority control device and switches the first relay switch to the second position for a predetermined period of time, wherein the priority timer circuit energizes the priority load device and deenergizes the secondary relay switch for the predetermined time period and, upon expiration of the predetermined time period, automatically returns the first relay switch to the first position to deenergize the priority load device and energize the second relay switch.

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