Motors: expansible chamber type – Relatively movable working members with one having motive... – Position of one working member controls motive fluid for...
Patent
1981-08-06
1984-06-26
Garrett, Robert E.
Motors: expansible chamber type
Relatively movable working members with one having motive...
Position of one working member controls motive fluid for...
91520, 91536, 417342, 60579, 60581, 60591, F15B 1306
Patent
active
044559216
ABSTRACT:
A concrete pump comprises a pair of separate pump assemblies each having a cylinder, a piston subdividing same into a piston-side front compartment and a rod-side rear compartment, and a piston rod connected to the respective piston and extending out of the respective cylinder through the respective rod-side rear compartment. The pump also has a liquid supply having a high-pressure side and a low-pressure side for supplying liquid under high pressure at the high-pressure side and for taking in liquid at the low-pressure side. The concrete pump is further provided with a mode valve connected to all of the compartments and to both of the supply sides and having at least one valve element movable between a piston-side position in which the high-pressure side is connected to one of the front compartments, the low-pressure side is connected to the other of the front compartments, and the rear compartments are connected together, and a rod-side position in which the high-pressure side is connected to one of the rear compartments, the low-pressure side is connected to the other of the rear compartments, and the front compartments are connected together. Thus the mode valve serves to energize the assemblies at the front sides in the piston-side position and at the rear sides in the rod-side position.
REFERENCES:
patent: 3073123 (1963-01-01), Hodgson et al.
patent: 3733965 (1973-05-01), Braun
patent: 4243106 (1981-01-01), Skubich et al.
Dubno Herbert
Garrett Robert E.
Maschinenfabrik Walter Scheele GmbH & Co. KG
Meyer Richard S.
Ross Karl F.
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