Level and slope control for reciprocating machines

Claim 1

IN A SLOPE CONTROL MECHANISM FOR A POWER SQUARING SHEAR HAVING A RECIPROCABLE SHEAR KNIFE AND A PAIR OF HYDRAULIC MOTOR DEVICES ADJACENT TO OPPOSITE ENDS THEREOF FOR EFFECTING WORKING AND RETURN STROKES OF THE SHEAR KNIFE, A GENERALLY UPRIGHT MEMBER MOVABLE WITH SAID SHEAR KNIFE AND PIVOTED AT ONE END RELATIVE THERETO ON AN AXIS GENERALLY PERPENDICULAR TO THE PLANE OF RECIPROCAING SAID HYDRAULIC MOTOR DEVICES, MEANS FOR ADJUSTING SAID UPRIGHT MEMBER ON SAID PIVOT TO VARY THE ANGLE BETWEEN SAID MEMBER AND SAID SHEAR KNIFE, FLUID MEANS FOR VARIABLY TRANSFERRING OPERATING FLUID TO AND FROM SAID CIRCUIT MEANS TO ADVANCE OR RETRACT ONE OF SAID MOTOR DEVICES RELATIVE TO THE OTHER TO ADJUST THE ANGULAR DISPOSITION OF SAID SHEAR KNIFE, VALVE MEANS FOR SAID FLUID TRANSFER MEANS HAVING A CONTROL MEMBER ADJACENT TO SAID UPRIGHT MEMBER AND ENGAGEABLE AGAINST AN EDGE THEREOF, SAID EDGE BEING NORMALLY PARALLEL TO THE DIRECTION OF RECIPROCATION OF SAID SHEAR KNIFE WHEREBY UNDER NORMAL CONDITIONS SAID CONTROL MEMBER REMAINS RELATIVELY STATIONARY, SAID CONTROL MEMBER BEING MOVED IN ONE DIRECTION OR THE OTHER BY REASON OF SAID EDGE ENGAGEMENT WHEN SAID UPRIGHT MEMBER ASSUMES AN OBLIQUE POSITION RELATIVE TO SAID DIRECTION OF RECIPROCATION, SAID VALVE MEANS BEING ACTUABLE BY SAID CONTROL MEMBER MOVEMENT TO TRANSFER FLUID AND THEREBY ADJUST SAID SHEAR KNIFE ANGULARLY AND THUS RESTORE SAID UPRIGHT MEMBER TO SAID PARALLEL RELATION WITH RESPECT TO THE DIRECTION OF RECIPROCATION.