Patent ID: 6784784
Filing Date: 2004-08-31
Classification: E05B,G08B

Abstract:
An alarm system, comprising:a control unit for generating a lock control signal in response to a request to enter (REN) signal; and generating an alarm signal in response to an open door signal when both of said REN signal and a request to exit (REX) signal are absent; a door detector for generating said open door signal indicative of an open door, said door having an exterior side and an interior side; a device for generating said (REN) signal in response to a request to unlock said door from said exterior side; a door lock assembly fixed to said door for unlocking said door in accordance with said lock control signal; the door lock assembly engaged to an interior handle on said interior side for unlatching said door in response to a rotation of said interior handle, the door lock assembly having mechanical isolation between said exterior side and said interior side; and a REX switch within the door lock assembly on said interior side for generating said REX signal in response to said rotation, wherein said mechanical isolation prevents force on said exterior side from generating said REX signal.