Retractable unloader

Claim 1

AN UNLOADER FOR THE UNLOADING OF SHIPS, COMPRISING: A MOVABLE BASE MEMBER DISPLACEABLE LONGITUDINALLY OF A SHIP TO BE UNLOADED, A BEAM SYSTEM INCLUDING A PLURALITY OF BEAMS PIVOTABLY MOUNTED BY THE LOWER END PORTIONS THEREOF ON SAID BASE MEMBER TO BE ROCKED IN A TRANSVERSE VERTICAL PLANE, AN UPPER STRUCTURE CARRIED BY THE UPPER END PORTIONS OF THE BEAMS OF SAID BEAM SYSTEM FOR MOVEMEMT THEREWITH TO BE EXTENDED AND RETRACTED THEREBY TOWARD AND AWAY FROM SAID SHIP; PENDULUM ARM MEANS CONNECTED TO SAID UPPER STRUCTURE FOR SWINGING MOVEMENT IN THE DIRECTION OF SAID VERTICAL PLANE BETWEEN FIRST AND SECOND POSITIONS; CABLE MEANS INCLUDING A FIRST REACH EXTENDING LONGITUDINALLY OF SAID ARM MEANS IN ALL POSITIONS THEREOF AND A SECOND REACH DEPENDING FROM THE FREE END PORTION OF SAID ARM MEANS; GRABBUCKET MEANS SUSPENDED FROM SAID SECOND REACH, SAID GRAB-BUCKET MEANS BEING ADAPTED TO BE LOWERED INTO AND RAISED FROM A HOLD OF SAID SHIP WITH SAID UPPER STRUCTURE EXTENDED AND SAID ARM MEANS IN SAID FIRST POSITION; LOAD RECEIVING MEANS CARRIED BY SAID UPPER STRUCTURE AND POSITIONED BELOW THE FREE END PORTION OF SAID ARM MEANS IN SAID SECOND POSITION THEREOF; WINCH MEANS CARRIED BY SAID UPPER STRUCTURE AND CONNECTED TO SAID CABLE MEANS FOR OPERATION OF SAID GRAB-BUCKET MEANS; POWER OPERATED MEANS CONNECTED TO SAID ARM MEANS FOR MOVING SAID ARM MEANS SELECTIVLY BETWEEN SAID FIRST AND SECOND POSITIONS; AND FURTHER POWER OPERATED MEANS FOR SELECTIVELY EXTENDING AND RETRACTING SAID UPPER STRUCTURE.