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Movable barrier operator having cable tension sensor and door lock mechanism

  • US 6,782,662 B2
  • Filed: 04/23/2002
  • Issued: 08/31/2004
  • Est. Priority Date: 04/25/2001
  • Status: Expired due to Term
First Claim
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1. In an arrangement for moving a barrier with respect to an opening in a wall, a safety arrangement comprising:

  • motor driven apparatus for extending and retracting a cable attached to the barrier;

    first cable guide for retaining the cable at substantially first predetermined distance from the wall;

    second cable guide spaced apart from the first cable guide for retaining the cable at second predetermined distance from the wall;

    cable tension sensing apparatus contacting the cable between the first and the second cable guide apparatus for generating a signal when slack is detected in the cable; and

    a controller responding to the signal from the cable tension sensing apparatus for controlling movement of the barrier.

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