Hydraulic arrangement for adjusting the spacing of the rolls in rolling mills and for compensating mill spring

Claim 1

IN A ROLLING MILL, IN COMBINATION, TWO ROLLS ROTATABLE ABOUT RESPECTIVE, SUBSTANTIALLY PARALLEL AXES; TWO BEARING MEANS MOVABLE RELATIVE TO EACH OTHER TRANSVERSELY OF SAID AXES, SAID BEARING MEANS ROTATABLY SUPPORTING RESPECTIVE ONES OF SAID ROLLS; JACK MEANS INCLUDING A CYLINDER ELEMENT AND A PISTON ELEMENT JOINTLY DEFINING A PRESSURE SPACE IN SAID JACK MEANS, SAID ELEMENTS BEING CONNECTED TO RESPECTIVE ONES OF SAID BEARING MEANS FOR JOINT MOVEMENT THEREWITH; A SOURCE OF PRESSURE FLUID; VALVE MEANS COMMUNICATING WITH SAID SOURCE AND SAID PRESSURE SPACE AND MOVABLE FOR ALTERNATIVELY ADMITTING FLUID TO SAID SPACE FROM SAID SOURCE, AND FOR RELEASING SAID FLUID FROM SAID SPACE; AND CONTROL MEANS FOR ACTUATING MOVEMENT OF SAID VALVE MEANS, SAID CONTROL MEANS INCLUDING A FIRST CONTROL MEMBER MOVABLE IN A DIRECTION TOWARD AND AWAY FROM A PREDETERMINED POSITION RELATIVE TO A FIRST ONE OF SAID ELEMENTS IN RESPONSE TO CHANGES IN THE FLUID PRESSURE IN SAID PRESSURE SPACE, A SECOND CONTROL MEMBER AND A THIRD CONTROL MEMBER SPACEDLY ARRANGED AND EACH CONNECTED TO THE SECOND ELEMENT OF SAID JACK MEANS FOR JOINT MOVEMENT THEREWITH RELATIVE TO SAID FIRST ELEMENT BETWEEN TWO POSITIONS IN WHICH ONE OF SAID SECOND AND THIRD CONTROL MEMBERS IS RESPECTIVELY ADJACENT SAID FIRST CONTROL MEMBER WHEREAS THE OTHER ONE OF SAID SECOND AND THIRD CONTROL MEMBERS IS REMOTE FROM SAID FIRST CONTROL MEMBER, AND ACTUTATING MEANS RESPONSIVE TO THE RELATIVE POSITION OF SAID FIRST CONTROL MEMBER AND THE ADJACENT ONE OF SAID SECOND AND THIRD CONTROL MEMBERS FOR ACTUATING MOVEMENT OF SAID VALVE MEANS.