Pumps – Motor driven – Relatively movable pumping members driven by relatively...
Patent
1971-08-02
1977-07-19
Croyle, Carlton R.
Pumps
Motor driven
Relatively movable pumping members driven by relatively...
417469, 417516, 417900, F04B 1700, F04B 1902, F04B 1502
Patent
active
040365646
ABSTRACT:
A concrete hopper has a plurality of arcuate channels in its bottom portion, preferably lined with a resilient material, such as rubber. The hopper includes a discharge end with discharge outlets formed therein in communication with the channels. A sliding sleeve-piston combination is associated with each channel for segregating and discharging a portion of the concrete through its associated discharge outlet. In other words, the sleeves are alternately filled by moving them through the hopper, and the pistons are operated to force the concrete out of the sleeves. A slide valve assembly including a discharge nozzle for connecting to a discharge hose and a pair of wear plates controls the discharge of pumped concrete from the discharge outlets. Hydraulic control means are included which automatically program the sequential operation of the sliding sleeve-piston combinations and the sliding valve. The pumping apparatus is designed to prevent the crushing of rock during shifting of the slide valve by being constructed so that the ends of the pistons and sleeves when fully extended lie in the same plane as the wear faces of the valve wear plates.
REFERENCES:
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patent: 2667841 (1954-02-01), Meader
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patent: 3266433 (1966-08-01), Mason
patent: 3298322 (1967-01-01), Sherrod
patent: 3327634 (1967-06-01), Whiteman, Jr.
patent: 3429267 (1969-02-01), Zinga
patent: 3682575 (1972-08-01), Guddal et al.
Croyle Carlton R.
Glemser Harry W. F.
Smith Leonard
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