Holding device for door closers

Details Holding device for door closers Holding device for door closers

1985-08-27

1987-05-12

Schran, Donald R.

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Checks and closers

Liquid

16 53, 16 72, 16DIG9, E05F 304

Patent

active

046638008

ABSTRACT:
A door holding device for door closers is described in which a door is held only at a predetermined angle of opening and in which the selected holding position can remain unchanged over a long period of time but can nevertheless be released by electrical means. For this purpose the switching of the door is effected, starting from a known mechanical door holding device which can be switched in and switched out, via a control unit which is biased into a door holding position by the hydraulic pressure which is in any event present in the closer and which can be released again via a magnetic valve.

REFERENCES:
patent: 3771823 (1973-11-01), Schnarr
patent: 3964125 (1976-06-01), Tansley
patent: 4121319 (1978-10-01), Welch
patent: 4376323 (1983-03-01), Tillmann
patent: 4506407 (1985-03-01), Downey

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