Earth working blade attachment tool, and method of positioning and mounting same on the blade

Claim 1

THE METHOD FOR DETACHABLY POSITIONING AN ATTACHMENT TOOL AGAINST AN EARTH WORKING BLADE HAVING A CONCAVE WORKING FACE; THE TOOL HAVING A FRAME STRUCTURE THE REAR FACE OF WHICH IS OF A CONVEX CURVATURE AND BEING OF SUCH CONSTRUCTION THAT WHEN SAID TOOL IS AT REST ON A SUPPORTING SURFACE WITH ITS REAR CONVEX FACE IN ENGAGEMENT WITH SUCH SUPPORTING SURFACE A FREE OPEN SPACE EXISTS BETWEEN SAID SUPPORTING SURFACE ASND THE TOP END PORTION OF THE TOOL, AND HOOK MEANS ON SAID TOOL ABOVE THE BOTTOM THEREOF AND OPEN AT THE TOP FOR RECEIVING THE LOWER EDGE OF THE BLADE; SAID METHOD COMPRISING FIRST POSITIONING THE TOOL WITH ITS CONVEX REAR FACE RESTING ON A SUPPORTING SURFACE WHEREBY THE TOP END PORTION THEREOF IS ABOVE SAID SURFACE AND SUCH FREE OPEN SPACE IS PROVIDED BETWEEN SAID SUPPORTING SURFACE AND SAID TOP END PORTION, WHILE THE TOOL IS THUS SUPPORTED ON ITS REAR FACE MOVING THE BLADE TO INSERT IT WITH THE BOTTOM OF THE BLADE FOREMOST INTO SAID OPEN SPACE BETWEEN SAID TOP END PORTION AND SAID SUPPORTING SURFACE, AND CONTINUING SUCH MOVEMENT TO ELEVATE THE TOOL AND CAUSE THE LOWER EDGE OF THE BLADE TO ENGAGE IN SAID HOOK MEANS AND THE CONCAVE FACE OF THE BLADE TO ENGAGE THE CONVEX FACE OF THE TOOL.