poore

Claim 1

IN AN ARTICULATED SELF-PROPELLED EARTH MOVING VEHICLE OF THE TYPE INCLUDING A SINGLE AXLE TRACTOR UNIT AND A SINGLE AXLE SCRAPER UNIT, A HITCH APPARATUS COMPRISING A FIRST HITCH MEMBER; MEANS FOR CONNECTING SAID MEMBER ON THE MAIN FRAME OF SAID TRACTOR UNIT FOR PIVOTAL MOVEMENT ON A HORIZONTAL PIVOT AXIS EXTENDING LONGITUDINALLY OF THE TRACTOR UNIT; A SECOND HITCH MEMBER; MEANS FOR PIVOTALLY CONNECTING SAID SECOND HITCH MEMBER ON SAID FIRST HITCH MEMBER FOR RELATIVE PIVOTAL MOVEMENT ON A HORIZONTAL AXIS EXTENDING TRANSVERSELY OF SAID TRACTOR UNIT; MEANS FOR CONNECTING SAID SECOND HITCH MEMBER TO SAID TRAILING UNIT FOR RELATIVE PIVOTAL MOVEMENT ON A VERTICAL PIVOT AXIS; AND A PAIR OF EXPANSIBLE CONTRACTIBLE FLUID MOTORS DISPOSED AT OPPOSITE LATERAL SIDES, RESPECTIVELY, OF SAID FIRST HITCH MEMBER AND EACH INCLUDING A PAIR OF RELATIVELY MOVABLE ELEMENTS PIVOTALLY CONNECTED, RESPECTIVELY, TO SAID FIRST AND SECOND HITCH MEMBERS; AND FLUID PRESSURE MEANS INCLUDING CONTROL MEANS FOR OPERATING SAID FLUID MOTORS TO CONTROL THE ANGLE OF ADJUSTMENT BETWEEN SAID TRACTOR UNIT AND SCRAPER UNIT ABOUT SAID TRANSVERSE HORIZONTAL AXIS.