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RESTRAINED ACCESS PROTECTION APPARATUS

  • US 3,779,178 A
  • Filed: 02/14/1972
  • Issued: 12/18/1973
  • Est. Priority Date: 02/14/1972
  • Status: Expired due to Term
First Claim
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1. Apparatus for restraining an intruder within a limited access area of a building, which comprises:

  • a. a walled enclosure forming a limited access area in combination with the floor and ceiling of the building and having one or more entryways contained therein;

    b. an entry door positioned within each of the one or more entryways and having said entry door appearing to be nonstationary;

    c. an electronic sensor positioned within the limited access area to detect the presence of an intruder within the limited access area; and

    d. mechanical means for permanently positioning the one or more entry doors in a closed position responsive to the detection of the presence of the intruder by the electronic sensor so as to restrain the intruder within a limited access area.

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