Adjustable knife and clamp assembly

Claim 1

A CLAMP CONTROL FOR USE WITH A CUTTING MACHINE ADAPTED TO CUT PILES OF MATERIAL, SAID MACHINE INCLUDING A KNIFE MOVABLE IN GUILLOTINE-LIKE CUTTING STROKES TOGETHER WITH A CLAMP MOVABLE FROM A RAISED POSITION TO A CLAMPING POSITION AGAINST A PILE OF MATERIAL AND A HYDRAULIC UNIT PROVIDING A POWER DRIVE FOR SAID CLAMP AND KNIFE; SAID CONTROL COMPRISING DRIVING LINKAGE MEANS OPERATIVELY ASSOCIATED WITH SAID HYDRAULIC UNIT FOR MOVING SAID CLAMP TOWARD AND AWAY FROM A PILE, VALVE MEANS OPERATIVE TO HALT THE UPWARD MOVEMENT OF SAID CLAMP MEANS AND TO MAINTAIN SAID CLAMP IN THE RAISED POSITION, MEANS CONTROLLING SAID VALVE MEANS INCLUDING A CABLE OF FIXED LENGTH SECURED AT ONE END OF SAID DRIVING LINKAGE MEANS AND AT THE OTHER END TO SAID VALVE MEANS FOR RELATING THE POSITION OF SAID CLAMP AND FOR CAUSING SAID VALVE TO HALT THE UPWARD MOVEMENT OF SAID CLAMP BY ESTABLISHING A CONDITION OF HYDRAULIC PRESSURE EQUILIBRUIM, AND ADJUSTABLE GUIDE MEANS CONTROLLING THE PATH ALONG WHICH SAID CABLE MOVES TO VARY THE EFFECTIVE ACTION OF SAID CABLE ON SAID VALVE MEANS.