Patent ID: 7284621

Claim:
A ground leveling apparatus arranged to be drawn behind a prime mover and comprising: a ground engaging knife edge mounted on an elongate carrier joined to a drawbar arrangement that is rigid between a forward end at which first connecting means is provided for pivotally connecting the drawbar arrangement to the prime mover and a rear end at which second connecting means is provided for connecting the drawbar arrangement to the carrier, the second connecting means being such that the carrier is unable to rotate axially with respect to the drawbar arrangement, the carrier having a bottom portion that is parallel to the knife edge and that bears on the ground when the apparatus is in the first working position and skids over the ground as the apparatus is drawn over the ground by the prime mover, the drawbar arrangement being arranged to position the carrier so that the knife edge is level with the bottom portion and being such that the carrier remains on the ground under its own weight while the forward end of the drawbar arrangement undergoes a predetermined degree of pivotal movement in a vertical direction about the connection, wherein a ratio of a first distance between the forward end and the rear end of the drawbar to a second distance between the bottom portion of the carrier and the knife edge is not less than twelve, whereby when the forward end of the drawbar moves vertically a third distance the knife edge moves in a same vertical direction a fourth distance that is the third distance times an inverse of the ratio.