초록 ▼

Down-force control is provided by a top-link, which presses down the rear end of a tool-bar carrying multiple rows of seeder tools. The height of the tool bar is set front and rear during operation. The top-link includes a hydraulic ram. The ram is supplied with pressure from a pressure-reducing-rel

Down-force control is provided by a top-link, which presses down the rear end of a tool-bar carrying multiple rows of seeder tools. The height of the tool bar is set front and rear during operation. The top-link includes a hydraulic ram. The ram is supplied with pressure from a pressure-reducing-relieving valve, whereby the downward-force on the rear of the tool-bar remains constant during operation. The tool bar has side wings which are pressed down by a pressure that is regulated by the same valve. The system allows the seeder to maintain constant implantation depth, even over uneven ground.

대표청구항 ▼

[ I claim:] [1.] Apparatus for mounting an agricultural implement with respect to a towing tractor, wherein:the implement includes a tool bar, on which are mounted one or more rows of ground-penetrating tools;the tool bar has a front end and a rear end;the tool-bar includes a point TF located near t

[ I claim:] [1.] Apparatus for mounting an agricultural implement with respect to a towing tractor, wherein:the implement includes a tool bar, on which are mounted one or more rows of ground-penetrating tools;the tool bar has a front end and a rear end;the tool-bar includes a point TF located near the front of the tool-bar, the point TF being a height HF above the ground surface and the apparatus includes a first-link means for setting the height HF above the ground surface;the apparatus includes a means for maintaining the height HF constant, during operation;the apparatus includes a means for permitting pitch-mode pivoting movement of the tool-bar relative to the tractor, about point TF;the apparatus includes a hydraulically-operable second-link, which is connected between the tractor and a point CF on the tool-bar;the point CF is a point on the tool-bar near the front end of the tool-bar, the point CF being spaced from the point TF;the second-link is of such structure that its length, being the distance between the tractor and the point CF, can be changed by hydraulic operation;the apparatus includes a means for supplying hydraulic pressure to the aforesaid second-link;the second-link is effective, when operated by hydraulic pressure, to apply a force between the tractor and point CF, and thereby to exert on the tool-bar a moment about point TF;the means for supplying hydraulic pressure to the second link includes a means for maintaining the hydraulic pressure at a constant magnitude;and the means for maintaining the hydraulic pressure at a constant magnitude is arranged to be effective to keep the magnitude of the hydraulic pressure constant even through changes in the length of the second-link.