Outrigger counterbalance for cranes

Claim 1

A VEHICLE CRANE, COMPRISING A CRANE BASE PIVOTALLY MOUNTED ON THE LOAD PLATFORM OF A VEHICLE HAVING FRONT AND REAR AXLE ASSEMBLIES, PARTICULARLY A MOTOR-DRIVEN VEHICLE, TO WHICH BASE IS JOINED A CRANE TOWER AND/OR CRANE BOOM, AND WITH A COUNTERWEIGHT ARM WHICH IN A TRANSPORT POSITION IS GENERALLY PARALLEL TO THE LENGTHWISE EXTENT OF SAID LOAD PLATFORM AND IN A WORK POSITIONS EXTENDS TRANSVERSELY TO SAID LOAD PLATFORM, AND WHICH IS THEN SECURED AGAINST MOVEMENTS IN A VERTICAL DIRECTION WITH RESPECT TO SAID LOAD PLATFORM AND AT ITS OUTER END BEARS A COUNTERWEIGHT, SAID COUNTERWEIGHT ARM COMPRISING: TRAILER MEANS HAVING A PULL-BAR PIVOTABLE AROUND A VERTICAL AXIS ADJACENT THE INNER END THEREOF, WHICH TRAILER MEANS IN TRANSPORT POSITION RESTS UPON AND EXTENDS OVER THE LOAD PLATFORM TO A CONSIDERABLE EXTENT, SAID TRAILER MEANS INCLUDING A WHEEL ASSEMBLY IN THE AREA OF THE COUNTERWEIGHT WHICH IN THE WORK POSITION RESTS ON THE GROUND.