Road structure – process – or apparatus – Traffic steering device or barrier
Patent
1987-04-29
1989-04-04
Massie, IV, Jerome W.
Road structure, process, or apparatus
Traffic steering device or barrier
49 33, 49 49, E01F 1300
Patent
active
048181366
ABSTRACT:
A hydraulic barricade comprising a support to which a barricade plate is pivotally attached. At least a first hydraulic cylinder and piston assembly is operably connected with the barricade plate for pivoting the barricade plate between an up and a down position. A pump supplies pressurized hydraulic fluid to a primary source and a secondary source of pressurized fluid. A directional control valve is interposed between the cylinder and piston assembly and the sources for causing operation of the cylinder and piston assembly and thereby pivoting of the barricade plate. A first check valve is interposed between the sources for permitting pressurized fluid to flow from the pump and the cylinder and piston assembly to the secondary source and for preventing fluid from flowing from the secondary source to the primary source. The secondary source includes an hydraulic accumulator for storing hydraulic fluid under pressure. An emergency valve is interposed between the secondary source and the directional control valve for supplying fluid from the accumulator to the directional control valve and the emergency valve includes a manual/remote operator for permitting selective operation thereof.
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Womsck Educational Publications, Industrial Fluid Power Text, vol. 2 (1972), pp. 155, 162-174.
Lippy Michael
Nasatka Ralph G.
Massie IV Jerome W.
Smith Matthew
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