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US 3,994,627 AGranted
Pumping apparatus for wet concrete
AssigneeFogt Industriemaschinenvertretung A.G.
InventorSergio Calzolari
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AssigneeFogt Industriemaschinenvertretung A.G.
InventorSergio Calzolari
Estimating the term…
A pumping apparatus for wet concrete and the like comprising a pair of piston pumps having parallel axes, interlocked to one another and operating in phase opposition, the orifices of which are alternatively put in communication one with the conduit feeding the wet concrete and the other with the delivery conduit and vice versa by means of a reciprocally movable baffle blade valve having two operative limit positions, characterized by the fact that the pump pistons are each actuated by a single-acting jack, being provided means to at first move the baffle valve into either of its operative positions by means of a hydraulic control device, and then to actuate the jack which is about to begin its intake stroke only when the baffle blade valve has reached one of the limit positions, and to reverse the position of said baffle valve into its second limit position before the beginning of the compression stroke of the pump actuated by said jack and vice versa, and means for interlocking the movements of the jacks, and thus of the pumps connected therewith.
Apparatus for pumping wet concrete and the like comprising a pair of piston pumps mounted in parallel relation and operating in phase opposition, said piston pumps each including a single acting fluid pressure piston and cylinder, said piston pumps each having a reciprocating piston and a cylinder, each piston pump cylinder having an open end, a baffle blade valve means arranged at the open ends of said piston pump cylinders and having two limit positions for controlling the charging and discharging of wet concrete through respective open ends of said piston pump cylinders, a source of pressurized fluid, a five-way fluid actuator-distributor means coupled to said baffle blade valve means and hydraulically connected between said source of pressurized fluid and said fluid pressure cylinders for controlling the position of said baffle blade valve means and for supplying pressurized fluid to and discharging pressurized fluid from said fluid pressure cylinders, said actuator-distributor means having a first operative position for first moving said baffle blade valve means to one of said two limit positions and for subsequently supplying pressurized fluid to a first one of said fluid pressure cylinders and discharging pressurized fluid from a second one of said fluid pressure cylinders and a second operative position for first moving said baffle blade valve means to the other of said two limit positions and subsequently supplying pressurized fluid to said second fluid pressure cylinder and discharging pressurized fluid from said first fluid pressure cylinder, changeover valve means connected to said actuator-distributor means for shifting said actuator-distributor means between the first and second operative positions thereof, means for hydraulically interlocking the movements of the pistons of said fluid pressure cylinders and means restoring pressurized fluid in said hydraulic interlocking means and discharging therefrom excess pressurized fluid for maintaining said piston pumps in substantially exact phase opposition.
Dependencies are inferred from the claim text.