Hydraulic circuits for tree-harvesting knuckle booms
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United States of America Patent
Stats
-
Jul 20, 2004
Grant Date -
Jan 22, 2004
app pub date -
Jul 19, 2002
filing date -
Jul 19, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic valve is used to judiciously shunt oil from lowering ends of the hoist and stick cylinders that have been plumbed to achieve near horizontal movement. This allows the use of cylinders that have unequal rod/bore ratios or to compensate for certain transient effects that may require the exchange of oil to the reservoir. The action of the hydraulic valve acts without obtrusive operator intervention and is essentially automatic. This allows for greater flexibility in the design of the boom system, allows the boom system to perform various tasks, while not requiring obtrusive intervention from the operator.
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Family
International Classification(s)
Cited Art Landscape
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