Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Reexamination Certificate
2007-04-03
2009-11-10
Lazo, Thomas E (Department: 3745)
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
C060S428000
Reexamination Certificate
active
07614225
ABSTRACT:
A straight traveling hydraulic circuit is provided. In case of performing a combined operation in which a fine operation of a working device and a fine traveling of a traveling device are simultaneously required, the straight traveling hydraulic circuit can allow the working device and the traveling device to operate independently, and thus prevent a declination or sudden traveling of the equipment. In case of performing the combined operation by simultaneously operating the traveling device and the working device, first and second center bypass shifting valves installed on the lowermost stream side of first and second center bypass passages are shifted by a pilot signal pressure that shifts a straight traveling valve installed on an upper stream side of the second center bypass passage, so that the degree of opening of the first and second center bypass passages is reduced to operate the working device and the traveling device independently.
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Patent abstracts of Japan of JP 6-306892 dated Nov. 1, 1994.
Patent abstracts of Japan of JP 2000-282514 dated Oct. 10, 2000.
Patent abstracts of Japan of JP 4-70429 dated Mar. 5, 1992.
Ladas & Parry LLP
Lazo Thomas E
Volvo Construction Equipment + Holding Sweden AB
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