Leveling and rake control for hydraulic shear

Claim 1

IN A SHEAR HAVING A FRAME, A TABLE SECURED TO SAID FRAME, SAID FRAME COMPRISING SIDE PLATES HAVING GUIDES FOR A RAM, A RAM GUIDED BY SAID GUIDES, A KNIFE SECURED TO SAID RAM, A HYDRAULIC CYLINDER MOUNTED ON EACH SIDE PLATE AND EACH HAVING A PISTON SECURED TO SAID RAM TO ACTUATE THE SAME; A HYDRAULIC CIRCUIT INCLUDING SAID CYLINDERS IN TANDEM HYDRAULIC RELATION, MEANS FOR SUPPLY HYDRAULIC FLUID UNDER PRESSURE TO, AND BLEEDING HYDRAULIC FLUID FROM, THE TANDEM CONNECTION BETWEEN SAID CYLINDERS, TO CAUSE THE PISTON OF ONE OF SAID CYLINDERS TO OCCUPY A DIFFERENT VERTICAL POSITION THAN THE OTHER, SAID ONE CYLINDER BEING MOUNTED FOR FREE SLIDING HORIZONTAL MOVEMENT WITH RESPECT TO SAID ONE OF SAID SIDE PLATES, WHEREBYAS THE RAKE OF SAID KNIFE IS CHANGED SAID ONE CYLINDER MOVES HORIZONTALLY WITH RESPECT TO SAID ONE OF SAID SIDE PLATES, AND MEANS FOR CONTROLLING THE SAID SUPPLYING AND BLEEDING OF HYDRAULIC FLUID IN RESPONSE TO THE POSITION, IN ITS HORIZONTAL PATH OF MOVEMENT, OF SAID ONE CYLINDER.