Metal demolition shear

A heavy duty scrap metal shear for attachment to the boom structure and hydraulic system of a backhoe, comprising

• a lower jaw and an upper jaw and pivot means interconnecting the jaws together, the lower jaw having frame means for attachment to the boom structure of the backhoe and the upper jaw having means for attachment to the hydraulic system of the backhoe for closing and opening the upper jaw relative to the lower jaw,
• the lower jaw and the upper jaw having rigid lower and upper shear blades extending along each other and having a thickness and a width greater than the thickness to provide strength for shearing a workpiece of such scrap metal when the upper blade is closed onto the lower shear blade,
• the upper and lower shear blades having inner and outer workpiece engaging edge portions opposite to each other and also having intermediate portions between said inner and outer edge portions, the inner and outer edge portions of the upper shear blade extending obliquely of each other,
• the lower jaw also having a rigid guide blade lying along and spaced from the lower shear blade to permit the upper shear blade to pass therebetween,
• and the guide blade having a top supporting surface spaced below the cutting edge of the lower shear blade by a distance at least as great as the approximate thickness of the lower shear blade to be normally spaced below the workpiece on the shear blade, the top supporting surface extending along both of the inner and outer edge portions of the lower shear blade to receive and support the workpiece after the workpiece is severed by the shear blades.

A heavy duty scrap metal shearing for attachment to the boom structure and hydraulic system of a backhoe, comprising

• a lower jaw and an upper jaw and pivot means interconnecting the jaws together, the lower jaw having frame means for attachment to the boom structure of the backhoe and the upper jaw having means for attachment to the hydraulic system of the backhoe for closing and opening the upper jaw
• the lower jaw and the upper jaw having rigid lower and upper heavy duty shear blades extending along each other for shearing a workpiece of such scrap metal when the upper blade is closed onto the lower shear blade,
• the upper and lower shear blades having inner and outer workpiece engaging edge portions opposite to each other and also having intermediate portions between said inner and outer edge portions, the inner and outer edge portions of the upper shear blade extending obliquely of each other, the upper and lower shear blades having elongate hardened steel insert bars affixed thereon and defining said edge portions for shear such scrap metal, the bars having depth in a direction transversely of such edge portions to accommodate such shearing of scrap metal,
• the lower jaw also having a rigid guide blade lying along and spaced from the lower shear blade to permit the upper shear blade to pass there between, and the lower jaw having an outer end with means affixing the outer ends of the lower shear blade and the guide blade to each other,
• and the guide blade having a top supporting surface spaced below the workpiece engaging edge portions of the lower shear blade by a distance approximating the depth of the insert bar on the lower shear blade to be normally spaced below the workpiece on the shear blade, the top supporting surface extending along both of the inner and outer edge portions of the lower shear blade to receive and support the workpiece after the workpiece is severed by the shear blades.