Door closer and holder

Details Door closer and holder Door closer and holder

1981-09-01

1983-11-15

Rosenbaum, Mark

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

Checks and closers

Liquid

16 56, 16 62, 16 64, 16 69, E05F 312, E05F 320

Patent

active

044147031

ABSTRACT:
A door closer and holder has cylinders with pistons therein responsive to the relative swinging motion between a door panel and a door frame. A spring is loaded by door opening and acts against one piston to effect door closing. Various hydraulic passages opening into the cylinders have valves therein to control the door panel opening and closing speed or speeds. One of the valves, electrically operated, allows the door panel to close from a hold-open position.

REFERENCES:
patent: 3220047 (1965-11-01), Flint
patent: 3852846 (1974-12-01), Slaybaugh
patent: 3934307 (1976-01-01), Lasier et al.
patent: 4115897 (1978-09-01), Zunkel
patent: 4234996 (1980-11-01), Jentsch
patent: 4263694 (1981-04-01), Jentsch

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