Patent ID: 8516750
Filing Date: 2013-08-27
Classification: E05F,E05G,E05Y

Abstract:
1. A method of operating a revolving security door system, said door system comprising a substantially arcuate drum defining an enclosure and opposed first and second openings, a revolving door disposed for rotation within the enclosure and including plural radially extending door wings, a secure zone within said enclosure, first sensor means disposed generally along a radial line extending from an axis of rotation of said door to said enclosure for detecting at least one of an intruder and an object moving into said zone from said first opening on a nonsecure side of said door system, said first sensor being activated the entire time said revolving door is revolving, and second sensor means comprising plural object detection sensors for sensing the presence of an object remaining in said zone, said method comprising: rotating said door to allow an authorized person to pass from said second opening on a secure side of said door system to said first opening; generating a light curtain by said first sensor; detecting with said first sensor means an intruder entering said zone; affirmatively deactivating said first sensor means any time a door wing passes through said light curtain; and arresting movement of said door in response to detecting said intruder entering said zone and in a position of said door to allow said intruder to exit said zone through said first opening.