Apparatus for delaying the closing of a door

Details Apparatus for delaying the closing of a door Apparatus for delaying the closing of a door

1981-09-01

1984-04-03

Moore, Richard E.

Closure fasteners

Magnetic

E05C 1756

Patent

active

044404280

ABSTRACT:
This invention relates to apparatus for holding swing or slide type doors open for a controlled period of time and includes in combination a door movable between a closed first position and a fully open second position. A holding device is mounted on a stationary support in such position as to be engaged by the door when moved to its second position, this device including an electromagnet and an actuating switch so disposed as to be engaged by the door when moved to its second position. Circuitry is provided between the switch and the magnet such that upon engagement of the door with the switch, the electromagnet is energized providing a magnetic force holding the door thereagainst. The circuitry further includes time delay means for deenergizing the electromagnet and for releasing the door after a predetermined period of time.
Included within the holding device is an alarm also connected into the circuitry which is energized a predetermined period of time before the aforementioned release thereby to provide an indication of impending door closing.

REFERENCES:
patent: 2472397 (1949-06-01), Bennett
patent: 3431002 (1969-03-01), Melgaard
patent: 3913958 (1975-10-01), Larime
patent: 4257631 (1981-03-01), Logan, Jr.

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