Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Hinge – Resiliently biased hinge
Patent
1986-03-25
1987-06-09
Godici, Nicholas P.
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Hinge
Resiliently biased hinge
16 58, 16323, 16DIG9, 16DIG17, E05F 312
Patent
active
046709398
ABSTRACT:
A hydro-magnetic door hold open device. A piston on a piston rod is slideably mounted in a cylinder that is mounted eccentrically inside a housing. The piston rod extends out of the housing and connects to a hingedly mounted door so that opening or closing of the door effects reciprocation of the piston within the cylinder. Both the housing and the cylinder within it are filled with hydraulic fluid. A ball valve positioned forwardly of the piston is confined within a valve chamber that has three seats; the inner cylinder is provided with apertures on the rearward side of the piston and forwardly of the valve chamber so that the ball valve is carried by the fluid into either of two of the seats attendant piston advancement or retraction and maintained in such seat by a pressure differential established in the fluid by the travel of the piston. A magnet external to the housing unseats the ball valve from either of the two seats and positions it in the third seat and this allows free swinging of the door when the door handle is manipulated.
REFERENCES:
patent: 1565770 (1925-12-01), Almesan
patent: 2005457 (1935-06-01), Dubitsky et al.
patent: 2044903 (1936-06-01), Grieshaber
patent: 2576168 (1951-11-01), Allen
patent: 3212122 (1965-10-01), Flint
patent: 3321210 (1967-05-01), Delchev
patent: 3415562 (1968-12-01), Petersen
patent: 3852846 (1974-12-01), Slaybaugh
patent: 4102004 (1978-07-01), Nagase
"The Illustrated Encyclopedia of Science and Invention"; H. S. Stuttman Inc. pub., pp. 1696 and 1098.
Godici Nicholas P.
Reid G. M.
Smith Ronald E.
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