Magnetic emergency exit door lock with delayed opening

Details Magnetic emergency exit door lock with delayed opening Magnetic emergency exit door lock with delayed opening

1979-06-25

1981-03-24

Moore, Richard E.

Closure fasteners

Magnetic

292 21, 292 92, E05C 1756

Patent

active

042576318

ABSTRACT:
A magnetic emergency exit door locking system includes a magnetic lock with an armature securred to an emergency exit door and a coil to the lintel of the door. The coil is connected to a power supply and keeps the door locked as long as the power supply applies current thereto. A drop-out relay is disposed in the line between the power supply and coil to interrupt current to the coil when operated. The drop-out relay is operated by a switch which is tripped upon pushing the push-bar on the door. In order to prevent immediate opening of the door upon pressing the push-bar, a timer is disposed between the switch and the drop-out relay to delay unlocking of the door for a selected interval having a duration of, perhaps, fifteen (15) to forty (40) seconds. An alarm sounds during this interval to give notice that someone is trying to open the door.

REFERENCES:
patent: 3431002 (1969-03-01), Melgaard
patent: 3576119 (1971-04-01), Harris

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