Boom cylinder control circuit for construction machine
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United States of America Patent
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Aug 19, 2014
Grant Date -
Sep 15, 2011
app pub date -
Nov 2, 2009
filing date -
Nov 19, 2008
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Disclosed is a boom cylinder control circuit for a construction machine including a boom cylinder having an ascending-side chamber and a descending-side chamber. The boom cylinder control circuit includes: a first floating chamber with first and second input ports connected to the descending-side chamber and the ascending-side chamber, respectively, at one side, and first and second output ports connected with the drain tank, at the other side, and is switched to selectively connect the first and second input ports to the first and second output ports in accordance with an operational signal of the floating selection operation part; and a second floating valve of which one side is connected to the first output port and the other side is connected to the drain tank to selectively connect the first output port with the drain tank in accordance with the operational signal.
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