Patent ID: 6609738
Filing Date: 2003-08-26
Classification: E05B,E05C,Y10S,Y10T

Abstract:
An emergency exit door lock system configured to cooperate with a door mounted in a door frame, the system being configured for sensing when a person attempts to open said door, and for allowing said door to open after a subsequent delay, the system comprising:a magnetic lock configured for preventing said door from opening, said lock including an electromagnet configured to be mounted on said door frame and an armature configured to be mounted on said door facing said electromagnet; an inertia absorbing elastically deformable connection at least partially housed within said door and configured to mount said armature on said door, said connection allowing a predetermined limited movement of said door relative to said armature and biasing said armature and said door toward a first relative position adjacent one another, said connection including a plunger at least partially housed within said door, connected to the armature, and configured for extending into said door when the connection is mounted thereto and an elastic biasing member at least partially housed within said door configured for resisting relative movement between the plunger and said door in which said elastic biasing member is configured to be mounted, the connection allowing relative movement of said door and the armature against resistance provided by the elastic biasing member; a sensor configured to be mounted to said door frame for sensing when said door has been urged by an external force away from said fully closed position to an activation position; and a controller coupled to said sensor, the controller being configured to provide an alarm signal in response to operation of said sensor sensing when said door has been moved away from said fully closed position to an activation position, and for providing a door unlock signal to de-energize said electromagnet at the end of a predetermined egress delay period.