Hydraulic system for a universal bucket of a tractor mounted loader

Claim 1

A HYDRAULICALLY OPERATED CONTROL SYSTEM FOR ACTUATING AN OSCILLATABLE MEMBER, SAID SYSTEM COMPRISING IN COMBINATION: (A) A FIRST HYDRAULICALLY OPERATED JACK OPERATIVELY CONNECTED TO SAID MEMBER; (B) A SECOND HYDRAULICALLY OPERATED JACK OPERATIVELY CONNECTED TO SAID MEMBER AND CONNECTED TO SAID FIRST JACK THROUGH SAID MEMBER WHEREBY OSCILLATING MOVEMENT OF SAID MEMBER IN RESPONSE TO HYDRAULIC ACTUATION OF ONE OF SAID JACKS CAUSES MOVEMENT OF THE OTHER OF SAID JACKS; (C) PRESSURE FLUID MEANS DISPOSED TO SUPPLY FLUID TO SAID FIRST JACK UNDER THE FULL OUTPUT PRESSURE OF SAID FLUID MEANS TO EFFECT OSCILLATION OF SAID MEMBER IN ONE DIRECTION; (D) SEQUENCE VALVE MEANS COMMUNICATING WITH SAID SECOND JACK AND WITH SAID PRESSURE FLUID MEANS, SAID SEQUENCE VALVE MEANS BEING RESPONSIVE TO A PREDETERMINED PRESSURE ACTING ON SAID FIRST JACK AND BEING OPERATIVE TO PREVENT FLUID FLOW FROM SAID PRESSURE FLUID MEANS TO SAID SECOND JACK UNTIL SAID PREDETERMINED PRESSURE ACTING ON SAID FIRST JACK IS EXCEEDED; AND (E) MEANS ASSOCIATED WITH SAID SEQUENCE VALVE MEANS AND WITH SAID SECOND JACK TO EFFECT FLUID FLOW FROM SAID PRESSURE FLUID MEANSTO SAID SECOND JACK WHILE SIMULTANEOUSLY SUPPLYING FLUID TO SAID FIRST JACK WHEN SAID PREDETERMINED PRESSURE ACTING ON SAID FIRST JACK IS EXCEEDED, WHEREBY TO CAUSE BOTH SAID JACKS TO EFFECT OSCILLATING MOVEMENT OF SAID MEMBER IN SAID DIRECTION UNDER THE THEREBY DIVIDED FORCE OF SAID PRESSURE FLUID MEANS.