Movable or removable closures – With operator for movably mounted closure – Operating lever or link and closure swing about parallel axes
Patent
1999-02-09
2000-09-19
Stodola, Daniel P.
Movable or removable closures
With operator for movably mounted closure
Operating lever or link and closure swing about parallel axes
49 49, 49 25, 49227, E01F 1306, E05F 1520, E05D 706
Patent
active
061193992
ABSTRACT:
A parallelogram gate for controlling traffic on a roadway, comprised of an arm assembly that is rotatable between a raised position and a horizontal, longitudinally-extended, roadway blocking position, a housing, and a drive assembly mounted within the housing. The arm assembly has parallel, elongated upper and lower rails, and a plurality of spaced-apart pickets pivotally attached to the upper and lower rails. A stationary pivot attaches a pivot end of the upper rail to the housing. A pair of vertical, grooved channel guides are attached to the housing at a location within the housing that is intermediate the stationary pivot and a lower portion of the housing. The drive assembly includes a hydraulic cylinder having a vertically-upward directed piston arm and mounted to the lower portion of the housing. A horizontal pin inserted through a traveling clevis carried by the piston arm, and inserted through a pivot end of the lower rail, extends into a groove within each of the guides. A pair of rollers is mounted for rotation about the pin and for vertical, translational motion within the grooves. The drive assembly includes a hydraulic drive system that raises and lowers the piston arm, and thus the arm assembly, in response to manual and/or radio frequency controls. The channel guides stabilize the gate against wind forces when the arm assembly is in the raised position.
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McCain Roy L.
Mountain Rocky E.
Wasson Allen G.
Coyne Brian J.
Stodola Daniel P.
Strimbu Gregory J.
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