Movable or removable closures – Unitary or interrelated fluid operator and closure check
Patent
1974-02-01
1976-02-17
Downey, Kenneth
Movable or removable closures
Unitary or interrelated fluid operator and closure check
49138, 49264, 49360, 91 31, E05F 1502
Patent
active
039382826
ABSTRACT:
An automatic sliding door operator for a door mounted upon a door frame for sliding movement in a vertical plane between opened and closed positions includes a drive cylinder to open and close the door by means of a drive piston slideably movable within the drive cylinder between fluid inlets located at each end of the cylinder. Control means are provided to couple a first fluid inlet of the drive cylinder through a controlled source of fluid pressure and to exhaust the opposite fluid inlet continuously throughout an opening stroke of the door and for connecting the second fluid inlet to the source of fluid pressure and exhausting the first fluid inlet continuously throughout a closing stroke of the door. The closing and opening rates of the door is controlled by suitable exhaust metering means continuously metering the exhaust flow of fluid. The exhaust metering means includes separate door moving metering controls and door cushioning metering controls so as to control the deceleration of the door as it approaches the end of its stroke and to assist in bringing the door to a gentle stop at its opened or closed position.
REFERENCES:
patent: 700404 (1902-05-01), Braden et al.
patent: 1479386 (1924-01-01), Hynes et al.
patent: 3186307 (1965-06-01), Ellenbogen
patent: 3260164 (1966-07-01), Guentner et al.
patent: 3619946 (1971-11-01), Crocker
Downey Kenneth
Kawneer Company Inc.
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