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Lock structure for entry and exit passages of sensitive installation

  • US 4,385,469 A
  • Filed: 04/27/1981
  • Issued: 05/31/1983
  • Est. Priority Date: 07/13/1978
  • Status: Expired due to Fees
First Claim
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1. A lock structure for passages between an outer and an inner protected area of sensitive installations enclosing radioactive materials, especially nuclear installations, said lock structure comprising a cylindrical housing arranged in said passage, a revolving body rotatably supported in said cylindrical housing about a vertical axis and having at least one lock chamber which is open at its radial outer end such that, in one angular position of said body, said chamber is in communication with said outer and, in the other angular position, with said inner, protected area;

  • metal detectors so mounted in the walls of at least the outer area of said passage as to be capable of sensing movement of metal parts through said passage from said outer to said inner area;

    radiation detectors arranged in the center of said revolving body and the walls of the cylindrical housing adjacent the path of the revolving body between said inner protected and said outer area so as to define a survey plane in the path of movement of said chamber from said inner protected to said outer area; and

    locking means operatively associated with said lock structure and operable by signals from said detectors for locking said revolving body in predetermined angular positions.

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