Metal cutting shear and adapter for mounting on a backhoe

A cutting and manipulation attachment for a backhoe, the bucket of which has been removed and having a boom with a controlled piston and cylinder assembly connected thereto comprising:

• a shear having an elongated, fixed cutting blade having a raised cutting edge portion and removable means pivotally attaching said fixed cutting blade to said boom, said fixed cutting blade having horizontally spaced, vertically positioned, parallel beam portions and horizontally disposed sections therebetween, means inwardly of a first end of said fixed cutting blade pivotally mounting a hook-shaped movable cutting blade thereon in movable relation to said fixed cutting blade from an open position to a closed work piece shearing position, said hook shaped portion including first, second and third cutting edge portions, said first and third cutting edge portions of said hook-shaped cutting blade arranged in substantially right angular relation to one another, wherein said first cutting edge portion is directly adjacent to said means for pivotally mounting, wherein the length of said first cutting edge portion is substantially less than the length of said second cutting edge portion, and wherein the length of first cutting edge portion is substantially less than the length of said raised cutting edge portion of said fixed blade, whereby the cutting takes place relatively closer to said means for pivotally mounting than if said first and second cutting edge portions were of substantially equal length, whereby said fixed blade and the movable blade are structured to urge a workpiece being cut to move along said fixed blade toward said means for pivotally mounting, to generate more shearing force than if the workpiece were sheared at a greater distance from said means for pivotally mounting, means for keeping the cutting edge portions of said hook-shaped 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 third cutting edge portion of said hook-shaped movable cutting blade having a sharpened end portion directed generally toward said fixed cutting blade, said means for keeping the cutting edge portions of said hook-shaped movable cutting blade in shearing relation to said raised cutting edge portion of said fixed cutting blade comprising a slot in a horizontal section of said fixed cutting blade inwardly of said first end thereof and oppositely disposed raised members on said fixed cutting blade alongside said slot defining an elongated guide path, said slot being positioned and sized to receive and maintain said sharpened end portion of said hook-shaped movable cutting blade and said cutting edge portions of said hook-shaped movable cutting blade in shearing relation to a work piece disposed between said blades, a second piston and cylinder assembly pivotally engaged on a second end of said elongated fixed cutting blade and means operatively connecting said hook-shaped movable cutting blade to said second piston and cylinder assembly so that the same can be moved in an arcuate path relative to said fixed cutting blade thereby from said open to closed position and vice versa, and means on said fixed cutting blade in spaced relation to said removable means pivotally attaching said fixed cutting blade to said boom of said backhoe operatively connecting said fixed cutting blade to said controlled piston and cylinder assembly so that said shear can be moved relatively to said boom.

A cutting and manipulating attachment for a backhoe, the bucket of which has been removed and having a boom with a controlled piston and cylinder assembly connected thereto comprising:

• an adapter body and means for pivotally attaching the same to the boom of the backhoe, a shear comprising an elongated, fixed cutting blade having a raised cutting edge portion and means removably attaching said fixed cutting blade to said adapter body, said fixed cutting blade having horizontally spaced, vertically positioned, parallel beam portions and horizontal sections therebetween, a movable cutting blade having first, second, and third cutting edge portions thereon, means inwardly of a first end of said fixed cutting blade for pivotally mounting a movable cutting blade thereon in pivotal relation to said fixed cutting blade from an open position to a closed work piece shearing position, wherein said means for pivotally mounting a movable cutting blade includes a shaft having a first predetermined diameter portion and a second predetermined diameter portion and means connected to said second predetermined diameter portion to tightly position said movable blade on said means for pivotally mounting, wherein said first and third cutting edge portions are arranged in substantially right angular relation to one another, wherein said first cutting edge portion is directly adjacent to said means for pivotally mounting and wherein the length of said first cutting edge portion is substantially less than the length of said second cutting edge portion, whereby the cutting takes place relatively closer to said means for pivotally mounting than if said sides were of substantially equal length, 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 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 elongated fixed cutting blade comprising a slot in a horizontal section of said elongated fixed cutting blade inwardly of said first end thereof and defining an elongated guide path, said slot being positioned and sized to receive said end cutting portion of said movable cutting blade and said cutting edge portions of said movable cutting blade in shearing relation to a work piece disposed between said blades, a second piston and cylinder assembly pivotally engaged on a second end of said elongated fixed cutting blade and means operatively connecting said movable cutting blade to said second piston and cylinder assembly so that the same can be moved relative to said fixed cutting blade thereby from said open to closed position and vice versa, and means on said adapter body in spaced relation to said means for pivotally attaching said adapter body to said boom of said backhoe operatively connecting said adapter body to said controlled piston and cylinder assembly so that said adapter body member and said shear can removed relatively to said boom.