Single boom derrick units

Claim 1

AN OUTRIGGER FOR USE WITH TRUCKS AND OTHER MOBILE PLATFORMS HAVING PORTABLE DERRICKS AND THE LIKE, SAID OUTRIGGER COMPRISING AN OUTER HOUSING OF NON-CIRCULAR CROSS SECTION HAVING AN OPEN END, A DOUBLE ACTING HYDRAULIC CYLINDER DISPOSED WITHIN SAID HOUSING AND BEING ADAPTED FOR EXTENSIBLE MOVEMENT THROUGH THE OPEN END THEREOF, A PISTON OPERATIVELY DISPOSED WITHIN SAID CYLINDER, A TUBULAR CYLINDRICAL PISTON ROD DISPOSED WITHIN SAID CYLINDER, SAID PISTON ROD BEING SECURED TO SAID PISTON AT ITS LOWER END AND BEING RIGIDLY SECURED TO SAID HOUSING AT ITS UPPER END, A CYLINDRICAL PIPE DISPOSED CONCENTRICALLY WITHIN SAID PISTON ROD IN THE INFORMATION OF FIRST AND SECOND FLUID CONDUITS, A SLEEVE OF NON-CIRCULAR CROSS SECTION DISPOSED ABOUT AND ENCIRCLING SAID HYDRAULIC CYLINDER FOR ITS ENTIRE LENGTH AND BEING RIGIDLY SECURED THERETO, SAID SLEEVE BEING IN SLIDABLE ENGAGEMENT WITH THE INTERIOR WALLS OF SAID TUBULAR HOUSING FOR SUPPORTING SAID CYLINDER DURING THE LATTER''S EXTENSIBLE MOVEMENT, BASE MEANS PIVOTALLY MOUNTED ON THE OUTER END OF SAID CYLINDER, FIRST CLOSURE MEANS MOUNTED ON THE UPPER END OF SAID CYLINDER AND BEING MOVABLE THEREWITH, SAID FIRST CLOSURE MEANS HAVING AN APERTURE FOR ACCOMMODATION OF SAID PISTON ROD, THE SPACE BETWEEN SAID PISTON AND SAID FIRST CLOSURE MEANS BEING ENCLOSED BY SAID CYLINDER FORMING A FIRST FLUID CHAMBER, SECOND CLOSURE MEANS MOUNTED AT THE LOWER END OF SAID HYDRAULIC CYLINDER, THE