Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Reexamination Certificate
2007-06-01
2011-10-11
Leslie, Michael (Department: 3745)
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
C060S475000, C060S476000, C060S486000
Reexamination Certificate
active
08033107
ABSTRACT:
A hydrostatic drive with first and second hydraulic pumps and a dual-acting hydraulic cylinder. The dual-acting hydraulic cylinder has a first working chamber defined by a first piston surface and a second working chamber defined by a second piston surface. The first working chamber is connected to first connections of the first and second hydraulic pumps. The second working chamber is connected to a second connection of the second hydraulic pump. A second connection of the first hydraulic pump is connected to a hydraulic fluid reservoir. The ratio of the first piston surface to the second piston surface differs from the ratio of the total delivery volume of the two hydraulic pumps relative to the delivery volume of the second hydraulic pump. A tapping valve for removing hydraulic fluid is provided for the volumetric flow equalisation.
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International Preliminary Report on Patentability issued on Jan. 22, 2009 in connection with International Application PCT/EP2007/004886, of which the above-identified application is a national entry.
Brueninghaus Hydromatik GmbH
Leslie Michael
Scully , Scott, Murphy & Presser, P.C.
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