Movable or removable closures – Unitary or interrelated fluid operator and closure check
Patent
1988-09-20
1990-04-24
Dorner, Kenneth J.
Movable or removable closures
Unitary or interrelated fluid operator and closure check
49138, 49363, E05F 1502
Patent
active
049188640
ABSTRACT:
A variable speed controller for selectively varying a moving speed of a door which is moved between first and second positions by an automatic door operator having a control system and a cylinder with a reciprocating piston therein which is positioned identically with respect to the cylinder when the door is in both the first and second positions, includes first and second passageways, and at least one door position responsive valve means operably connected to the control system, cylinder and passageways for directing fluid from the control system through the first passageway to the cylinder to initiate movement of the door toward the second position when the door is in proximity to its first position and the control system is discharging the fluid, and for directing fluid from the control system through the second passageway to the cylinder to initiate movement of the door toward the first position when the door is in proximity to its second position and the control system is discharging the fluid. The controller also includes a variable push valve in the second passageway which permits unrestricted fluid flow from the cylinder to be exhausted through the second passageway, and which permits selectively variable restriction of fluid flow from the control system to the cylinder through the second passageway so that movement of the door from the second position to the first position may be initiated at a selected speed.
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Beckeman Raymond A.
Ebbott Henry M.
Gregerson Glen M.
Lunenschloss John T.
Air-Lec Industries, Inc.
Anderson Gerald A.
Dorner Kenneth J.
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