Counterweight support mechanism

Claim 1

IN A MOBILE CRANE HAVING A BASE, HOIST MECHANISM ON SAID BASE, AND A COUNTER BALANCING LOAD UNIT ON SAID BASE POSITIONED OT BALANCE LOAD LIFTED BY SAID HOIST MECHNISM, THE IMPROVEMENT COMPRISING MEANS FOR SUPPORTING SAID COUNTER BALANCING LOAD UNIT ON SAID BASE INCLUDING AT LEAST ONE SUPPORT ARM PIVOTALLY MOUNTED O SAID BASE, MEANS FOR ATTACHING SAID COUNTER BALANCE LOAD UNIT TO AN OUTER PORTION OF SAID SUPPORT ARM POWER MEANS ATTACHED TO SAID SUPPORT ARM TO MOVE SAID ARM BETWEEN A RAISED AND A LOWERED POSITION, RELEASABLE LATCH MEANS FOR LOCKING SAID ARM IN A RAISED POSITION, SAID LATCH MEANS INCLUDING A LATCH DOG PIVOTALLY MOUNTED TO SAID BASE AND ALIGNED WITH SAID SUPPORT ARM, SAID SUPPORT ARM HAVING A LATCH NOTCH PROVIDED THEREIN IN POSITION TO ALIGN WITH AND RECEIVE SAID LATCH DOG WITH SAID ARM IN SAID RAISED POSITION, BIASING MEANS URGING SAID LATCH DOG IN DIRECTION TO BECOME FULLY ENGAGED WITH TIS PROVIDED LATCH NOTCH, SAID BIASING MEANS COMPRISED AS A TORSION BAR ROTATABLY MOUNTED ABOUT AN AXIS SUBSTANTIALLY PARALLEL TO THE PIVOTAL AXIS OF SAID LATCH DOG, A TORQUE ARM FIXEDLY ATTACHED TO SAD TORSION BAR ADJACENT SAID LATCH DOG, MEANS PIVOTALLY LINKING SAID TORQUE ARM TO SAID LATCH DOG, A CONTROL LEVER FIXED ON A PORTION OF SAID TORSION BAR SPACED FROM SAID TORQUE ARM, AND A POSITIONING MEMBER CONNECTED TO SAID BASE, SAID CONTROL LEVER BEING MOVABLE TO A FIRST POSITION WITH RESPECT TO SAID POSITIONING MEMBER WHEREIN SAID LATCH DOG IS URGED BY SAID TORSION BAR IN DIRECTION TOWARD A FULLY SEATED POSITION IN ITS LATCH NOTCH, SAID CONTROL LEVER BEING MOVABLE TO A SECOND POSITION WITH RESPECT TO SAID POSITIONING MEMBER WHEREIN SAID CONTROL LEVER WILL CAUSE SAID TORSION BAR TO RESILIENTLY URGE SAID LATCH DOG TO POSITION WHEREIN IT CLEARS THE SURFACES DEFINING ITS LATCH NOTCH.