Pumps – Correlated pump and motor or clutch control – Pump distributor control
Patent
1979-06-11
1982-08-24
Freeh, William L.
Pumps
Correlated pump and motor or clutch control
Pump distributor control
417515, 417519, F04B 704, F04B 4900
Patent
active
043458831
ABSTRACT:
Concrete is transmitted from a hopper forming a part of a mobile concrete pumping apparatus to the deposit site through a flow line having a Y-pipe inlet. The pumping apparatus includes two piston-cylinder concrete pumps mounted in side-by-side relationship adjacent the hopper, which has an auger to rapidly charge a pump with concrete through one of two discharge pipes. Each pump is pivotally mounted, to locate the cylinder aligned with the discharge pipe or with one inlet of the Y-pipe inlet. Each pump has a valve plate pivoting with the cylinder to alternately close the hopper opening and the inlet line. Hydraulic cylinder units are coupled to the valve plates to pivot the pumps. A floating valve plate has coupling pipes attached to the hopper and a hydraulic cylinder urges the same into sliding sealing engagement with the rotating valve plate. The pumps are individually, alternately and oppositely positioned for charging and discharging, with a common discharge period at the end of the one pump unit and start of the other pump unit.
REFERENCES:
patent: 2033338 (1936-03-01), Kirby
patent: 2442916 (1948-06-01), Buchanan
patent: 2579670 (1951-12-01), Hjarde
patent: 2660955 (1953-12-01), Kent et al.
patent: 2819835 (1958-01-01), Newhall
patent: 3298322 (1967-01-01), Sherrod
patent: 3429267 (1969-02-01), Zinga
patent: 3663129 (1972-05-01), Antosh
patent: 4174788 (1979-11-01), Casagrande
patent: 4178142 (1979-12-01), Schwing
Read Wayne L.
Westerlund Robert E.
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