Door closing device

Details Door closing device Door closing device

1976-02-13

1978-02-14

Schroeder, Werner H.

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

Checks and closers

Liquid

16DIG9, E05F 310

Patent

active

040730336

ABSTRACT:
A door closing device of the type having a piston and cylinder is described, the piston being movable within the cylinder under the bias of a spring and being connected to an arm mechanism which is arranged to transmit movement of the piston into pivoting movement of a door and vice versa, the device including a number of by-pass channels arranged to bring portions of chambers separated by the piston into communication with one another, whereby to limit the speed of flow of a dampening medium contained in the cylinder and passing through the channels as the piston is reciprocated.

REFERENCES:
patent: 2586135 (1952-02-01), Woodruff
patent: 2829395 (1958-04-01), Schlage
patent: 2834039 (1958-05-01), Sasse
patent: 2964779 (1960-12-01), Gohr
patent: 3887961 (1975-06-01), Saajos

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