Patent ID: 6314772
Filing Date: 2001-11-13
Classification: E05B,Y10S,Y10T

Abstract:
A pull station for an alarm, comprising:a housing including a base plate and a cover overlying said base plate;a handle mounted for movement with respect to said housing;an alarm switch within said housing which is activated by movement of said handle to place the pull station in an alarm mode;a latch activated by movement of said handle to move to a latched position to prevent reverse movement of said handle;a lock carried by said cover and arranged to lock said cover to said base plate, wherein said lock comprises a lock cam and a lock cylinder assembly, the lock cylinder assembly havinga lock actuation cylinder having a keyhole at one end thereof and a key actuation socket in registry with said keyhole, said lock actuation cylinder rotatable by a key having a polygonal cross section fit into said socket, said lock actuation cylinder fixed for rotation with said lock cam for locking said base plate to said cover; anda tumbler plate movable with respect to said lock actuation cylinder and interposed between said keyhole and said key actuation socket, and having a bore which is out of registry with said keyhole and movable into registry by a key pushed into said keyhole.