F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
103/45
F04B 15/02 (2006.01)
Patent
CA 1051264
ABSTRACT A concrete pumping unit in which a pair of parallel piston pumps are alternately put in communication with the concrete supply conduit and with the concrete delivery pipe, via a four-way change over valve and an actuator distributor means with a discharge reservoir. The actuator-distributor device comprises two single-acting hydraulic piston cylinders, operating in phase opposition, the piston rods of which are linked to the ends of a rocking bar, the pivot pin of which is integral with the spindle of the baffle blade valve, the hydraulic piston cylinders having solid heads and being each provided near each of its heads of an orifice, the first orifices, positioned near one of the two ends of said cylinders being interconnected by a pipe, while the second orifices which are arranged near the other ends are respectively connected by a respective pipe to the two orifices arranged at one side of the four-way change over valve, while the other two orifices are arranged at the opposite side of the valve and are connected to a fluid pump and to a pipe to return the fluid into the supply reservoir of said pump. A third orifice, in an intermediate position relative to the first and second orifice of each hydraulic pump cylinder is positioned just downstream of the piston when it reaches the limit position near the respective first orifice of the respective cylinder, said each third orifice being connected respectively with one of the orifices for the supply of the fluid into or for the discharge from the fluid pressure piston cylinders, while from the pipe interlocking the first orifices of said hydraulic distribution piston pumps is branched off a pipe directly connected to the fluid reservoir.
266967
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