Stabilizer means for plow with steerable tailwheel

Claim 1

A semi-supportable plough apparatus comprising a plough supporting frame having a rear end running wheel and a front mounted connector device for pivotally connecting the frame to a three-point mechanism of a tractor which includes a pair of generally parallel, horizontally spaced draw links extending rearwardly of the tractor, said connector device comprising: universal pivot structure including vertical pivot means pivotally interconnecting the pivot structure and the support frame for relative rotation about a generally vertical axis and horizontal pivot means for pivotally interconnecting the pivot structure and the draw links of a tractor for relative rotation about a generally horizontal axis extending transversely of the path of travel of the tractor; a frame stabilizer carried by the pivot structure for rotation about said horizontal axis, said stabilizer including a rod disposed for underlying said links when the pivot structure and links are interconnected; and a spring mechanism carried by said pivot structure for rotation therewith about said vertical axis, said mechanism including a spring member connected to said rod for interconnecting the pivot structure and the rod and yieldably limiting relative rotation therebetween about said horizontal axis whereby said rod will cooperate with said links to yieldably limit rotation of the frame about said horizontal axis relative to the links.