HYDRAULIC SYSTEM THERMAL CONTRACTION COMPENSATION APPARATUS AND METHOD
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United States of America Patent
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Issued Date -
May 15, 2014
app pub date -
Jan 17, 2014
filing date -
Jan 21, 2009
priority date (Note) -
Abandoned
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Abstract
An apparatus for compensating for fluid contraction in a hydraulic powered telescoping boom may include a monitor determining the elevation angle of the telescoping boom, a supply of hydraulic fluid, and a fluid control responsive to the monitor. The fluid control provides the hydraulic fluid from the supply to a hydraulic cylinder controlling extension of the telescoping boom when the elevation angle exceeds a predetermined threshold angle to compensate for thermal contraction of hydraulic fluid and thus prevent uncommanded boom retraction. A method in accordance with the invention is also disclosed.
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