Metal cutting shear with changeable multiple cutting edge portions

An improvement in a shear for a backhoe having a boom with a controlled piston and cylinder assembly connected thereto, said shear having an elongated fixed cutting blade having a raised cutting edge portions and means for attaching said fixed cutting blade to said boom, said fixed cutting blade having horizontally spaced vertically positioned parallel beam portions and horizontal sections therebetween, a movable cutting blade having a plurality of cutting edge portions, means inwardly of a first end of said fixed cutting blade pivotally mounting said movable cutting blade therebetween in pivotal relation to said fixed cutting blade from an open position to a closed work piece shearing position and means for keeping the plurality of cutting edge portions of said movable cutting blade in shearing relation to said raised cutting edge portion of said fixed cutting blade through the entire extent of the shearing movement of the blades with respect to each other, said means for keeping the cutting edge portions of said movable cutting blade in shearing relation to said raised cutting edge portion of said fixed cutting blade comprising a slot in one of said horizontal sections of said fixed cutting blade and inwardly of said first end thereof and defining an elongated guide path, said slot being positioned and sized to receive and maintain said movable cutting blade and said plurality of cutting edge portions thereon in shearing relation to a work piece disposed between said blades;

• the improvement comprising said plurality of raised cutting edge portions of said fixed cutting blade being removably affixed thereto, at least one of said plurality of raised cutting edge portions including a plurality of sides and at least two sharp cutting edge portions on at least two of its sides and being mounted on said fixed cutting blade to be changeably positioned on said fixed cutting blade to be moved from a position having a sharp cutting edge of one side aligned with the sharp cutting edges of the remainder of the cutting edge portions to another position having a sharp cutting edge or another side in alignment with those cutting edges of the remainder of said plurality of cutting edge portions.

An improvement in a shear for a backhoe having a boom with a controlled piston and cylinder assembly connected thereto, said shear having an elongated fixed cutting blade having a raised cutting edge portions and means for attaching said fixed cutting blade to said boom, said fixed cutting blade having horizontally spaced vertically positioned parallel beam portions and horizontal sections therebetween, a movable cutting blade having a plurality of cutting edge portions, means inwardly of a first end of said fixed cutting blade pivotally mounting said movable cutting blade therebetween in pivotal relation to said fixed cutting blade from an open position to a closed work piece shearing position and means for keeping the plurality of cutting edge portions of said movable cutting blade in shearing relation of said raised cutting edge portions of said fixed cutting blade through the entire extent of the shearing movement of the blades with respect to each other, said means for keeping the cutting edge portions of said movable cutting blade in shearing relation to said raised cutting edge portions of said fixed cutting blade comprising a slot in one of said horizontal sections of said fixed cutting blade and inwardly of said first end thereof and defining an elongated guide path, said slot being positioned and sized to receive and maintain said movable cutting blade and said plurality of cutting edge portions thereon in shearing relation to a work piece disposed between said blades;

• the improvement comprising said plurality of raised cutting edge portions of said fixed cutting blade being removably affixed thereto, at least one of said plurality of raised cutting edge portions including a plurality of sides and at least two sharp cutting edges on at least two of its sides and being mounted on said fixed cutting blade to be changeably positioned on said fixed cutting blade to be moved from a position having a sharp cutting edge of one side aligned with the sharp cutting edges of the remainder of the cutting edge portions to another position having a sharp cutting edge of another side in alignment with those cutting edges of the remainder of said plurality of raised cutting edge portions and wherein said plurality of cutting edge portions on said movable cutting blade are removably affixed thereto, at least one of said plurality of cutting edge portions including a plurality of sides and at least two sharp cutting edge portions on at least two of its sides and being mounted on said movable cutting blade to be changeably position on said movable cutting blade to be moved from a position having a sharp cutting edge of one side aligned with the sharp cutting edges of the remainder of the cutting edge portions to another position having a sharp cutting edge of another side in alignment with the those cutting edge portions of remainder of said plurality of raised cutting edge portions on said movable cutting blade.