Claims
- 1. In an 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 having a reciprocating pump piston and a pump cylinder, each pump cylinder having an open end, a baffle blade valve means arranged at the open ends of said pump cylinders and having two limit positions for controlling the charging and discharging of wet concrete through respective open ends of said pump cylinders, a double-acting fluid pressure piston and cylinder arranged coaxially with each piston pump for driving said piston pumps, a common piston rod for mounting the pistons of the associated piston pump and double-acting fluid pressure piston and cylinder, a source of pressurized fluid, a 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 on one side of the piston associated therewith 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 on one side of the piston associated therewith 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, and conduit means connected between said first and second fluid pressure cylinders on the other sides of the pistons associated therewith for hydraulically interlocking the movements of the pistons of said fluid pressure cylinders, the improvement comprising said actuator-distributor means comprising two fluid pressure pistons and cylinders operating in phase opposition, said baffle blade valve means having a spindle about which said baffle blade valve means pivots between said two limit positions, a rocking bar having ends and fixedly connected to said spindle intermediate the ends of said bar, the pistons of the actuator-distributor means each having a piston rod connected to a respective end of said rocking bar, each fluid pressure cylinder of said actuator-distributor means having closed ends and communicating with three orifices comprising a first orifice positioned adjacent one of said closed ends, the first orifices being connected by a pipe, a second orifice positined adjacent the other of said closed ends, the second orifices being connected to one side of said changeover valve means, the other side of said changeover valve means being connected to said pressurized fluid source and a fluid reservoir and a third orifice positioned intermediate said first and second orifice such that fluid communication is established between the second and third orifice when the associated piston of the actuator-distributor means is positioned adjacent the first orifice, a respective third orifice being connected to a respective one of said first and second fluid pressure cylinders of said piston pumps for the supply and discharge of pressurized fluid thereto, said pipe connecting said first orifices being connected with said fluid reservoir.
Priority Claims (1)
Number |
Date |
Country |
Kind |
52362 A/75 |
Nov 1975 |
ITX |
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Parent Case Info
This application is a continuation-in-part of my prior U.S. patent application Ser. No. 523,017 filed Nov. 12, 1974, now U.S. Pat. No. 3,994,627.
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2326997 |
Dec 1974 |
DEX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
523017 |
Nov 1974 |
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