Hydraulic circuit for actuating elevator lift and ejection mechanism for self-loading scraper

Claim 1

A HYDRAULIC CIRCUIT FOR A SELF-LOADING SCRAPER HAVING AN EJECTOR AND AN ELEVATOR COMPRISING, A DOUBLE ACTING ELEVATOR CYLINDER FOR RAISING AND LOWERING SAID ELEVATOR, A DOUBLE ACTING EJECTOR CYLINDER HAVING A DISPLACEMENT LARGER THAN SAID ELEVATOR CYLINDER FOR MOVING SAID EJECTOR FORWARD AND BACKWARD, A FIRST CONDUIT CONNECTED TO ONE END OF SAID EJECTOR CYLINDER, A SECOND CONDUIT CONNECTED TO THE OTHER END OF SAID EJECTOR CYLINDER AND TO ONE END OF SAID ELEVATOR CYLINDER, A THIRD CONDUIT CONNECTED TO THE OTHER END OF SAID ELEVATOR CYLINDER, A FOURTH CONDUIT CONNECTED TO EACH OF SAID SECOND AND THIRD CONDUITS AND A METERING VALVE INCLUDING A FIXED ORIFICE HAVING A RESTRICTED TWO-DIRECTIONAL FLOW; INTERPOSED IN SAID THIRD CONDUIT BETWEEN SAID ELEVATOR CYLINDER AND THE CONNECTION OF SAID THIRD AND FOURTH CONDUITS FOR CONTROLLING THE EGRESS OF FLUID FROM SAID ELEVATOR CYLINDER WHEREBY FLUID UNDER PRESSURE IN SAID FIRST CONDUIT WILL CAUSE SAID EJECTOR CYLINDER TO MOVE SAID EJECTOR BACKWARD AND SAID ELEVATOR CYLINDER TO SLOWLY LOWER SAID ELEVATOR.