Door accessory with a hydraulic retarding device

Details Door accessory with a hydraulic retarding device Door accessory with a hydraulic retarding device

1992-06-18

1993-06-15

Larson, Lowell A.

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

Checks and closers

Liquid

16 62, E05F 320, E05F 304

Patent

active

052193721

ABSTRACT:
A door accessory, such as a door hinge or a door check, includes a hydraulic retarding device for cushioning the closing action of a door. The hydraulic retarding device has a cylinder body which confines a fluid receiving space to receive hydraulic fluid therein. One end of a piston rod extends into the fluid receiving space and has a valve unit provided thereon. The valve unit includes a piston which is formed with perforations and which forms a clearance with the cylinder body and a valve ring which is loosely sleeved on the piston rod. The piston rod is operably associated with the door movement so that the valve ring does not block the perforations on the piston during a door opening action, thereby permitting faster fluid flow inside the fluid receiving space and providing little or no resistance to the movement of the piston rod, and so that the valve ring blocks the perforations on the piston during a door closing action, thereby permitting fluid to flow only through the clearance so as to retard the movement of the piston rod.

REFERENCES:
patent: 491898 (1893-02-01), Lowe
patent: 2118950 (1938-05-01), Stannard
patent: 2166651 (1939-07-01), Wennmann
patent: 2230661 (1941-02-01), Wennmann
patent: 2769195 (1956-11-01), Hanssen
patent: 3004280 (1961-10-01), Stein

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