Abstract: A convertible spreader-grader assembly convertible between a spreader-grader mode and a box scraper mode. The assembly includes a pair of spaced skid sleds, an interior framework positioned between and connected to them to maintain them in parallel longitudinal relation, and a hitch assembly connected to the framework for attaching the assembly to a suitable tractor. At least one cutter assembly extends between the skid sleds and is connected thereto by an adjustable mounting mechanism which provides for a plurality of positions of the cutting plate relative to the ground. For each position the blade assumes the same angle to the ground but has a different height of its lower edge relative to the ground. A plate extends between the skid sleds at a rear portion thereof. It is pivotally connected to them and can pivot between an upper horizontal position wherein earth and soil can pass underneath wherein the assembly defines its spreader grader mode.

Abstract: An improved tractor pulled earth mover is shown. The improved earth mover is a two-bladed earth scraper having two parallel blades mounted between two supporting side plates. The side plates define a level of ground with respect to which the earth grader is dragged. The side plates have a supporting structure including a mounting for a standard three point hitch for a tractor to permit manipulation, application, dragging and removal of the earth grader. Between the two side plates are located two parallel rigidly mounted blades having three settable depths found specifically advantageous for grading respectively loose sand, coarse aggregates such as rocks, and compacted dirt. The invention discloses a particularly advantageous geometric relationship between the blades and among the blades for optimum grading effectiveness.