Operating delay means for a hydraulic door closer

Details Operating delay means for a hydraulic door closer Operating delay means for a hydraulic door closer

1994-11-14

1995-06-27

Ro, Bentsu

Electricity: motive power systems

Automatic and/or with time-delay means

With nonautomatic control means

318452, 318466, 318484, 49 30, E05C 1760, E05F 1520

Patent

active

054282780

ABSTRACT:
A door closure delay system produces a first signal when a person approaches a doorway housing the door. The first signal is applied to a timing system and a voltage comparator so that a second signal is produced to limit closure of an open door. The second signal is maintained for a predetermined and adjustable time period after the first signal has been removed. More patricularly, a voltage regulator provides a base or reference voltage to the comparator. A sensor, monitoring the doorway or portal, provides a signal voltage to the comparator when a physical presence is in, or in proximity to the doorway. The comparator passes on an output voltage which is stretched (i.e., has its time line extended) to circuitry coupled to a door closer, to delay the closure of the door by the closer.

REFERENCES:
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patent: 4706227 (1987-11-01), DuVall et al.
patent: 4823010 (1989-04-01), Kornbrekke et al.
patent: 4973837 (1990-11-01), Bradbeer

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