Vehicle with boom

Claim 1

THE COMBINATION OF A TRACTOR HAVING A FRAME AND LATERAL SUPPORT MEANS ON EITHER SIDE OF THE FRAME SUPPORTING THE TRACTOR FOR MOVEMENT OVER THE GROUND, AN ARCHED BOOM DEFINED BY A PAIR OF OPPOSED LEGS JOINED AT ONE SET OF ENDS OF DEFINE AN APEX FOR THE BOOM, MEANS MOUNTING THE BOOM ADJACENT THE REAR END OF THE TRACTOR WITH THE BOOM RESTRICTED AGAINST LATERAL MOVEMENT THEREOF AND WITH THE LEGS OF THE BOOM CONNECTED TO THE TRACTOR FRAME ADJACENT THEIR UNJOINED SET OF ENDS AND THE BOOM EXTENDING UPWARDLY AND REARWARDLY OF THE TRACTOR FROM ITS CONNECTION WITH THE TRACTOR FRAME, GUIDE MEANS ADJACENT THE APEX OF THE BOOM FOR GUIDING A LINE THEREOVER, AND SUPPORT MEANS FOR THE BOOM MOUNTED ON AND EXTENDING DOWNWARDLY FROM THE BOOM, SAID SUPPORT MEANS HAVING GROUND-ENGAGING DOLLY WHEEL MEANS AT THE BASE THEREOF ROTATABLE ABOUT A WHEEL ROTATION AXIS, AND MEANS MOUNTING THE DOLLY WHEEL MEANS SUBSTANTIALLY DIRECTLY UNDER THE APEX OF THE BOOM WITH THE TRACTOR TRAVELING STRAIGHT AHEAD AND ACCOMMODATING SWINGING OF THE DOLLY WHEEL MEANS TO THE TURN SIDE OF THE TRACTOR UPON THE TRACTOR MAKING A TURN, SAID MEANS MOUNTING THE DOLLY WHEEL MEANS COMPRISING A SWIVELLED ARM THAT SWIVELS ABOUT A SUBSTANTIALLY VERTICAL AXIS LOCATED SUBSTANTIALLY AT THE LONGITUDINAL MIDLINE OF THE TRACTOR AND FORWARDLY OF THE ROTATION AXIS FOR THE DOLLY WHEEL MEANS.