Hydraulic down pressure control system for closing wheels of an agricultural implement
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United States of America Patent
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Oct 1, 2013
Grant Date -
Mar 15, 2012
app pub date -
Mar 30, 2011
filing date -
Sep 15, 2010
priority date (Note) -
In Force
status (Latency Note)
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Abstract
In one embodiment, an agricultural row unit for use with a towing frame hitched to a tractor includes an attachment frame adapted to be rigidly connected to the towing frame. A support member is pivotably coupled to the attachment frame to permit vertical pivoting movement of the support member relative to the attachment frame, and at least one furrow-closing device is mounted on the support member. A hydraulic cylinder is coupled to the support member for urging the row unit frame downwardly toward the soil. The hydraulic cylinder includes a movable ram extending into the cylinder, and a hydraulic-fluid cavity within the cylinder for receiving pressurized hydraulic fluid for urging the ram in a first direction that pivots the support member in a first vertical direction. An accumulator has a fluid chamber containing a pressurized gas for urging the ram in a second direction that pivots the support member in a second vertical direction.
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