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Automatic sliding door system for refrigerator unit

  • US 6,225,904 B1
  • Filed: 09/29/1999
  • Issued: 05/01/2001
  • Est. Priority Date: 09/29/1999
  • Status: Expired due to Fees
First Claim
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1. An automatic sliding door system, comprising:

  • an insulated door frame, adapted for placement between a walk-in freezer or refrigerator and the exterior thereof;

    a bi-parting door connected to said insulated door frame, said bi-parting door comprising a right door and a left door, each slidably connected to said insulated door frame;

    a motor for synchronously opening said right door and left door;

    an exterior sensor unit mounted on said door frame, said exterior sensor unit comprising an exterior motion sensor and an exterior presence detector positioned so as to view in a downward grid from atop said insulated door frame;

    an interior sensor unit mounted on said door frame, said interior sensor unit comprising an interior motion sensor and an interior presence detector positioned so as to view in a downward grid from atop said insulated door frame; and

    a controller electrically connected to said exterior sensor unit, said interior sensor unit, and said motor, said controller causing said motor to energize in response to a movement detection signal or a presence detection signal from either said exterior sensor unit or said interior sensor unit.

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