PULL-TYPE TILLER Russian patent published in 1997 - IPC

FIELD: agricultural engineering. SUBSTANCE: hitch tongue of tiller has double-armed lever pivotally secured on hitch tongue end. Vertical arm of double-armed lever is connected through tie-rod with link of four-link mechanism for lifting-lowering of hitch tongue so that additional four-link mechanism is defined by free portion of hitch tongue. Pulling member of hitch tongue is fastened on end of horizontal part of double-armed lever. Horizontal arm of lever is extending in parallel with frame plane, and value of vertical displacement of horizontal arm relative to frame is equal to or in reverse proportion to frame lifting or lowering value. Adjustable link of four-link mechanisms is positioned in pivot joint, which connects upper link of hitch tongue lifting-lowering four-link mechanism and common vertical link of four-link mechanism with additional four-link mechanism so that obtuse angle is defined. Adjustable link has movable stop positioned on link in the direction of movement in front of pivot joint and immovable stop positioned behind pivot joint. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 3 cl, 1 dwg