Hydraulic door control system

Details Hydraulic door control system Hydraulic door control system

1996-01-04

1997-07-29

Mah, Chuck Y.

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

Checks and closers

Liquid

16 58, 16 55, 16DIG9, E05F 304

Patent

active

056511620

ABSTRACT:
A hydraulic control system for automatically closing and opening a door is disclosed and has means for providing such opening and closing even if power is lost to the hydraulic control system. Further disclosed is a fluid control device of the hydraulic system which prevents the door from being opened or closed too quickly that might otherwise harm an individual that comes into the path of the moving door.

REFERENCES:
patent: 3875612 (1975-04-01), Poitras
patent: 4263694 (1981-04-01), Jentsch
patent: 4378612 (1983-04-01), Beers
patent: 4580365 (1986-04-01), Sieg
patent: 4660250 (1987-04-01), Tillman et al.
patent: 4995194 (1991-02-01), Schultze et al.
patent: 5343593 (1994-09-01), Fayngersh

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