Patent ID: 6472984
Filing Date: 2002-10-29
Classification: E05F,E05G,E05Y,E06B

Abstract:
A security entrance system for restricting access from an infeed area to a protected area comprising:a) a structure defining an enclosed chamber with a first opening connecting the interior of said chamber with said infeed area and a second opening connecting the interior of the chamber with said protected area, said structure including one or more first doors movable between a closed position in which said first doors block said first opening and an open position in which said first doors do not block said first opening, and one or more second doors movable between a closed position in which said second doors block said second opening and an open position in which said second doors do not block said second opening; b) a contraband detection system operative to detect contraband entering said chamber; c) a chamber monitoring system connected to said structure for measuring at least one characteristic of said structure defining said chamber; and d) a controller connected to said doors, said detection system and said chamber monitoring system, said controller operating cyclically, each cycle including allowing said first door to open to allow a person entry to said chamber, actuating said detection system to scan said chamber for contraband entering the chamber and allowing said second door to open if no contraband is detected and said first door is closed, thereby allowing the person entry to the protected area, said controller inhibiting operation of at least one of said doors if said at least one characteristic of said structure as determined by said chamber monitoring system while no person is present in said chamber differs from a normal value of such characteristic, whereby said controller will inhibit passage of a person into said protected area if any object is left in said chamber during a preceding cycle.