Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Checks and closers – Liquid
Patent
1985-06-24
1987-04-28
Jordan, M.
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Checks and closers
Liquid
16DIG9, 16DIG10, E05F 310
Patent
active
046602500
ABSTRACT:
An automatic door closer whose housing confines a reciprocable damper piston cooperating with a rotary shaft to rotate the shaft in a direction to close the door or to be moved by the shaft in response to opening of the door. The piston can be biased in a direction to close the door through the medium of the shaft by a strong coil spring as well as by a relatively weak second spring in the form of a torsion spring, an extension spring or a compression spring. The second spring ensures that the party opening the door invariably encounters some resistance to movement of the door from closed position as well as that the door begins to move toward the closed position as soon as the door opening force is reduced below the force of the second spring. The first spring is acted upon by a stressing device to ensure that such spring cannot oppose movements of the door to open position but is available to close the door with a certain delay following a relaxation of the door opening force so that the first spring can assist the second spring in closing the door if the first spring cannot close the door alone.
REFERENCES:
patent: 3852846 (1974-12-01), Slaybaugh
patent: 3934307 (1976-01-01), Lasier et al.
patent: 4010572 (1977-03-01), Peterson
patent: 4115897 (1978-09-01), Zunkel
patent: 4369545 (1983-01-01), Manublanc
patent: 4378612 (1983-04-01), Beers
patent: 4489640 (1984-12-01), Olson
patent: 4502180 (1985-03-01), Harrison et al.
patent: 4580365 (1986-04-01), Sieg
Sieg Giselher
Tillman Horst
Dorma-Baubeschlag GmbH & Co. KG.
Jordan M.
Kontler Peter K.
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