EXCAVATING BLADE ASSEMBLY

摘要

A blade assembly is adapted to be connected to the conventional three-point hitch of a farm tractor. A generally horizontal boom pivotally carries at its rear end a blade bucket which is swigable by means of a pair of double-action hydraulic jacks pivoted to the blade and to the boom. The front end of the boom is adapted to be pivotally connected to the pair of laterallyspaced hitch lever arms of the tractor hitch system. A spacer frame upstands from and is pivotally connected to the front ends of the boom. A central lever arm is pivotally connected intermediate its ends to the upper portion of the spacer frame. A central link pivotally interconnects the front end of said central lever arm with the front portion of the boom. A double-acting hydraulic jack interconnects the boom with the pivotal connection between the central lever arm and the link. The link, the boom, the spacer frame and the portion of the central lever arm which is rearward of the spacer frame form the sides of deformable quadrilateral structure which cause raising and lowering of the boom by extension and retraction of the lastnamed hydraulic jack respectively. The blade itself is characterized by a main panel bent to form three flat plate sections at an angle one with respect to the other. The blade can enter the ground and shovel back the earth with the minimum power requirement.