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Obstruction sensing edge for a bifolding door

  • US 4,133,365 A
  • Filed: 06/08/1977
  • Issued: 01/09/1979
  • Est. Priority Date: 06/08/1977
  • Status: Expired due to Term
First Claim
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1. A fluid pressure sensitive edge assembly for an electrically operated door comprising:

  • a channel portion for securement to said door;

    a first hollow body portion adjacent said channel portion defining an enclosed fluid chamber including fluid therein;

    a first edge member defined on said first body portion and extending therefrom substantially along the plane defined by said door;

    a second hollow body portion defining a second enclosed fluid chamber, a second edge member defined on said second body portion extending along said plane, and fluid actuated switch means for opening said door upon engagement of one of said first and second edge members with an obstruction during the operating cycle of said door causing deformation of one of said first and second fluid chambers and means for communicating said fluid chambers to said switch,said second edge member adapted to be positioned adjacent and overlapping said first edge member upon said door being closed;

    one of said first and second edge members including at least one rib member extending transverse to said one of said first and second edge members and abutting said other of said first and second edge members upon closure of said door thereby providing a seal between said first and second edge members.

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