Pumps – Expansible chamber type – Mechanically actuated distributor
Patent
1993-10-27
1995-10-17
Gluck, Richard E.
Pumps
Expansible chamber type
Mechanically actuated distributor
417900, F04B 710, F04B 1502
Patent
active
054584701
ABSTRACT:
A pumping apparatus of the type comprising twin cylindrical pumping chambers which alternately take in and deliver material to be pumped, the taking in being via ports in a common feeding chamber and the delivery being via a delivery conduit which moves to the port of the chamber which is to deliver. The pumping is carried out by hydraulically-actuated pumping pistons in the chambers, the hydraulic circuitry being adapted to ensure that the pumping piston in that chamber taking in material arrives at the fully charged position before the delivering chamber attains the fully discharged position. In another embodiment, the pumping apparatus comprises a "push-over" facility, wherein the speed of the pumping is automatically increased to compensate for the drop in flow rate caused by the time taken by the delivery conduit to move from one port to the other. The apparatus gives an exceptionally pulsation-free flow and is especially useful in concrete spraying apparatus.
REFERENCES:
patent: 3507347 (1970-04-01), Bennett
patent: 3778193 (1973-12-01), Reinert
patent: 4343598 (1982-08-01), Schwing et al.
patent: 4533300 (1985-08-01), Westerlund et al.
patent: 4566858 (1986-01-01), Akiba
patent: 4893922 (1990-01-01), Schlecht
patent: 5106272 (1992-04-01), Oakley et al.
Derwent Abstract for: WO 90/04104.
Derwent Abstracts for: SU 354300 DE 1653406 DE 2841514 US 3778193.
Page of Mannesman-Rexroth catalog depicting a series of "Proportional-directional control valves".
Mannhart Othmar
Tschumi Otto
Gluck Richard E.
Honor Robert S.
Parfomak Andrew N.
Sandoz Ltd.
Vila Richard E.
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