Door closer having means to neutralize the door closing force ex

Details Door closer having means to neutralize the door closing force ex Door closer having means to neutralize the door closing force ex

1975-06-02

1977-03-08

Schroeder, Werner H.

Movable or removable closures

With means mounting closure for swinging

With biasing means

16 62, 16137, 16DIG10, E05F 1504, E05F 322

Patent

active

040105725

ABSTRACT:
A door closer has an air cylinder which, when pressurized, neutralizes the door closing force applied by the closer so that the door will open with relative ease. The air cylinder is pressurized through a valve which is contained within the door and is operated by a handle on the door.

REFERENCES:
patent: 2276338 (1942-03-01), Potter et al.
patent: 2298542 (1942-10-01), Potter et al.
patent: 2586442 (1952-02-01), Seagren
patent: 2618365 (1952-11-01), Seagren
patent: 3872541 (1975-03-01), Peterson

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