Thermal contraction control apparatus for hydraulic cylinders
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United States of America Patent
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Oct 21, 2003
Grant Date -
Aug 28, 2003
app pub date -
Feb 26, 2002
filing date -
Feb 26, 2002
priority date (Note) -
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Abstract
A method and apparatus for operating a load lifting device to move a load and hold the load steady is disclosed. In the conventional arts, a lifted or lowered suspended load had a tendency to move from its desired position, as hydraulic fluid in the lifting system cooled, e.g. a stick slip condition. The present invention monitors a fluid pressure in the lifting system and compensates the fluid pressure to accommodate any pressure drop due to fluid cooling. Thereby, the load can be effectively held steady at a desired position, and the stick slip condition can be avoided.
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