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Fail-safe access control chamber security system

  • US 6,308,644 B1
  • Filed: 11/17/1999
  • Issued: 10/30/2001
  • Est. Priority Date: 06/08/1994
  • Status: Expired due to Fees
First Claim
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1. An access control vestibule, comprising;

  • a vestibule frame configured to form said access control vestibule mounted in said vestibule frame;

    an entrance door and an exit door;

    an entrance door frame and an exit door frame;

    a panel mounted in said vestibule frame and forming a side wall section of said vestibule;

    said entrance door and said exit door being formed by a panel mounted in each of said door frames;

    locks associated with said entrance door and said exit door;

    a metal detector located to detect a metal object being disposed between said entrance and exit doors;

    control means to prevent both doors from being unlocked at the same time, and to prevent said exit door from being unlocked when said metal detector detects a metal object;

    said entrance door and said exit door both being manually operated; and

    said entrance door and said exit door each being formed by a single swinging door, and swingable towards the outside of said vestibule.

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