Cultivators
AssigneeC. van der Lely N. V.
InventorsAry van der Lely, Cornelis Johannes Gerardus Bom
Life of this patent
Estimating the term…
Abstract
A tractor drawn cultivator comprises a frame extending transversely to the direction of movement of the tractor. A plurality of spaced apart vertical axis rotary driven cultivator members comprising downwardly extending tines are supported from the frame. Surrounding each cultivating member and suspended from the frame is a screen having two spaced apart side walls and an interconnecting rear wall. The side walls have forwardly and outwardly diverging front parts with rearwardly and downwardly extending leading edges. At least a portion of the rear wall is vertically adjustable to control the rate of soil release from the screen. A tool bar to the rear of the main frame may support a plurality of ridging bodies, one behind each cultivator member.
Claims17
A cultivator comprising a frame and a plurality of power driven soil-working members rotatably mounted on corresponding upwardly extending axes supported on said frame, said axes being positioned in a row that extends transverse to the direction of travel and at least one of said soil-working members including downwardly extending soil-working means, a screen supported on said frame and said screen having side and rear parts that extend upwardly around the sides and the rear of said one soil-working member, said side parts being substantially vertical and extending generally parallel to the normal direction of travel, the leading ends of said side parts having outwardly and forwardly divergent portions, the leading edge of each divergent portion being inclined downwardly and rearwardly from its uppermost extremity to the lowermost extremity thereof. said screen being located adjacent said soil-working means and cooperating therewith;
- said screen in combination with the soil-working means producing finely divided soil within the screen during operation, the rear part of said screen having a substantially vertical surface positioned to gradually release finely crumbled soil to the rear of said one soil-working member, said rear part being connected to said side parts and means selectively positioning said screen into the soil together with said soil-working means, whereby the rate of discharge of worked soil beneath said rear part and behind said screen with respect to the direction of travel, is controlled.
Dependencies are inferred from the claim text.