Removable blade

Claim 1

IN COMBINATION, A FORWARDLY OPENING BUCKET INCLUDING UPSTANDING SIDE WALLS AND A BOTTOM WALL CONNECTED TO AND EXTENDING TRANSVERSELY THEREBETWEEN, A TRANSVERSELY EXENDING FORWARD CUTTING EDGE UPON SAID BOTTOM WALL, CUTTING EDGES ON SAID SIDE WALLS EXTENDING UPWARDLY AND REARWARDLY FROM THE ENDS OF SAID FORWARD CUTTING EDGE, A REPLACEMENT BLADE ASSEMBLY DETACHABLY MOUNTED UPON SAID BUCKET COMPRISING A U-SHAPED BODY INCLUDING A TRANSVERSELY ELONGATED WEB WITH END PIECES EXTENDING UPWARDLY AND REARWARDLY THEREFROM, SAID WEB AND END PIECES EACH HAVING FORWARDLY DIRECTED KNIFE EDGES AND A REARWARDLY OPENING POCKET SNUGLY AND EMBRACINGLY RECEIVING THE FRONT PORTION OF SAID BUCKET BOTTOM AND SIDE WALLS, FASTENERS DETACHABLY SECURING SAID REPLACEMENT BLADE ASSEMBLY TO SAID BUCKET SIDE WALLS, A PLURALITY OF LONGITUDINALLY SPACED TEETH SECURED TO SAID WEB AND PROJECTING FORWARDLY THEREFROM, EACH TOOTH COMPRISING A V-SHAPED ELEMENT INCLUDING TOP AND BOTTOM MEMBERS WITH A REARWARDLY OPENING SPACE THEREBETWEEN EMBRACING THE FORWARD EDGE OF SAID WEB, THE BOTTOM MEMBER HAVING A KNIFE EDGE AT ITS FORWARD END, SAID TOP MEMBER HAVING ITS FORWARD EDGE RIGIDLY SECURED TO SAID BOTTOM MEMBER REARWARDLY OF THE BOTTOM MEMBER FORWARD EDGE, SAID WEB BEING SECURED TO SAID BOTTOM WALL BY A SINGLE REMOVABLE FASTENER EXTENDING THROUGH BOTH SAID BOTTOM WALL AND WEB, AND AN ARCUATE RIB-LIKE GUARD BONDED TO AND RISING FROM THE TOP SURFACE OF SAID WEB AND AT LEAST PARTIALLY ENCIRCLING SAID REMOVABLE FASTENER, SAID REMOVABLE FASTENER BEING DISPOSED REARWARDLY OF A SUBSTANTIALLY CENTRALLY LOCATED TOOTH BETWEEN THE TOP MEMBER THEREOF AND THE GUARD.