Magnetic emergency exit door lock with time delay

Details Magnetic emergency exit door lock with time delay Magnetic emergency exit door lock with time delay

1986-10-29

1988-01-19

Moore, Richard E.

Closure fasteners

Magnetic

E05C 1756

Patent

active

047201282

ABSTRACT:
A door mounted in a door frame is held closed by an electromagnet mounted on the door frame which magnet attracts an armature mounted on the door. A switch is mounted adjacent to the electromagnet and is operated by a switch operator mounted on the door. The switch provides a signal indicating that an attempt is being made to open the door, which signal may be used to sound an alarm or start a time delay release. A pair of contacts are also mounted adjacent to the electromagnet and are bridged by the armature to indicate when the armature is properly held by the electromagnet.

REFERENCES:
patent: 4123752 (1978-10-01), Novotny
patent: 4284980 (1981-08-01), Hainski
patent: 4609910 (1986-09-01), Geringer et al.

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