Patent ID: 7707951

Claim:
A substantially automatic, compact, robotic-like, security system for preventing crime in high traffic buildings comprising: at least one revolving door unit; a geared flywheel fixed to said revolving door unit, wherein the geared flywheel in operation restricts rotation of the revolving door unit in an anti-clockwise direction only; a semi-circular inside wall, wherein the at least one revolving door unit includes two pairs of door panels that revolve within the semi-circular wall, and the two pairs of door panels define at least four zones; said at least four zones including, in operation, at least two zones defining independent isolated chambers, wherein each independent isolated chamber is formed by two door panels and said inside semi-circular wall; four equidistant plunger accepting cylinders attached to said geared flywheel; one plunger attached to a fixed section of said semi-circular wall; wherein a respective timing apprehension position of the revolving door unit is defined each time a respective plunger accepting cylinder is located opposite a plunger; a low voltage electromechanical subsystem including at least two personnel detectors, below said revolving doors, which are activated by personnel stepping over them; and at least two other detectors positioned to scan within said independent isolated chambers; and a substantially automatic means for electromechanically stopping said revolving door, without alerting person within revolving door, only when (i) a timing apprehension position of said revolving door unit is achieved and (ii) a signal is received from one or more of said detectors, for thwarting an illegal activity, which when stopped forms said independent isolated chambers from which access/exchange with an open chamber is not achievable.