Self-propelled aerial platform

Claim 1

A SELF-PROPELLED AERIAL PLATFORM COMPRISING A RECTANGULAR FRAME, A RAISED REARWARDLY EXTENDING PORTION EXTENDING FROM THE REAR EDGE OF SAID FRAME, A SUPPORTING WHEEL SWIVELLY MOUNTED BENEATH THE REAR END OF SAID EXTENDING PORTION, A DRIVE WHEEL MOUNTED ON EACH SIDE ADJACENT THE FRONT END OF SAID FRAME, A FIXED VERTICAL MAST EXTENDING FROM SAID REAR RAISED PORTION OF SAID FRAME, SAID MAST COMPRISING A VERTICALLY MOUNTED I-BEAM, VERTICALLY SPACED HINGES ON THE FRONT EDGE OF SAID FIXED I-BEAM, A SECOND I-BEAM HAVING COMPLEMENTARY VERTICALLY SPACED HINGES MOUNTED ON SAID HINGES IN FRONT OF SAID FIXED IBEAM, SAID SECOND I-BEAM HAVING A HORIZONTAL HINGE MOVEMENT LIMITED TO 40* BY THE CONTACT OF THE ADJACENT EDGES OF SAID I-BEAMS, A BOOM ARM PIVOTALLY MOUNTED ADJACENT THE UPPER END OF SAID SECOND I-BEAM, A PLATFORM MOUNTED ON THE OTHER END OF SAID BOOM ARM, MEANS FOR MAINTAINING SAID PLATFORM IN HORIZONTAL POSITION IN ANY VERTICAL POSITION OF SAID BOOM ARM, MEANS FOR PIVOTING SAID BOOM ARM VERTICALLY, SAID PIVOTING MEANS COMPRISING A HYDRAULIC CYLINDER MOUNTED ON SAID SECOND I-BEAM, THE LOWER END OF SAID CYLINDER BEING PIVOTALLY MOUNTED ADJACENT THE LOWER END OF SAID SECOND I-BEAM, AND A PISTON EXTENDING FROM SAID CYLINDER AND HAVING ITS FREE END PIVOTALLY ATTACHED TO SAID BOOM ARM, MEANS FOR SWINGING SAID BOOM ARM HORIZONTALLY ON SAID HINGED MOUNTING, MEANS FOR DRIVING EACH FRONT WHEEL INDEPENDENTLY, AND MEANS ON SAID PLATFORM FOR CONTROLLING SAID PIVOTING, SWINGING AND WHEEL DRIVING MEANS.