Patent ID: 7021398

Claim:
A box scraper assembly for attachment to the forwardly extending boom arms of a vehicle, comprising: a main frame having a rearward end, a forward end, a right side and a left side; said rearward end of said main frame adapted for selective removable attachment to the boom arms for vertical movement therewith; an elongated transversely extending first frame member, having right and left sides, pivotally secured, intermediate the length of said first frame member, to said forward end of said main frame about a horizontally axis which is transverse with respect to the length of said first frame member; a first castor wheel assembly secured to said right end of said first frame member; a second castor wheel assembly secured to said left end of said first frame member; a transversely extending box scraper, having a right end and a left end, selectively vertically movably mounted and selectively pivotally movably mounted on said main frame; said box scraper being pivotally secured to said main frame about a longitudinally extending axis; a first hydraulic cylinder secured to said box scraper adjacent said right end thereof for pivotally raising and lowering said right end of said box scraper; a second hydraulic cylinder secured to said box scraper adjacent said left end thereof for pivotally raising and lowering said left end of said box scraper; said first and second hydraulic cylinders being connected to a source of hydraulic pressure so that said first hydraulic cylinder is extended while said second hydraulic cylinder is being retracted and so that said first hydraulic cylinder is retracted while said second hydraulic cylinder is being extended; said first and second hydraulic cylinders being operatively movably connected to said main frame so that the vertical movement of said box scraper with respect to said main frame does not change the relative relationship of said first and second hydraulic cylinders with respect to said right and left ends of said box scraper as said box scraper is vertically moved with respect to said main frame.