08544397 is referenced by 26 patents and cites 306 patents.

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 linkage pivotably coupled to the attachment frame, and a row unit frame having a leading end pivotably coupled to the linkage to permit vertical pivoting movement of the row unit frame relative to the attachment frame. A hydraulic cylinder coupled to the attachment frame and the linkage, for urging the row unit frame downwardly toward the soil, includes a movable ram extending into the cylinder, and a hydraulic-fluid cavity within the cylinder for receiving pressurized hydraulic fluid for advancing the ram in a direction that pivots the linkage and the row unit frame downwardly toward the soil. An accumulator positioned adjacent to the hydraulic cylinder has a fluid chamber containing a diaphragm, with the portion of the chamber on one side of the diaphragm being connected to the hydraulic-fluid cavity in the hydraulic cylinder, and the portion of the chamber on the other side of the diaphragm containing a pressurized gas.

Row unit for agricultural implement
Application Number
Publication Number
8544397 (B2)
Application Date
September 15, 2010
Publication Date
October 1, 2013
Joseph D Bassett
Nixon Peabody
Dawn Equipment Company
A01B 23/06
A01B 15/18
A01B 15/16
A01B 15/14
A01B 7/00
A01B 5/10
A01B 63/32
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