Lift arm structure for power loaders

Claim 1

LIFT ARM STRUCTURE FOR A POWER LOADED ADAPTED FOR LONGITUDINAL SUPPORT ON A TRACTOR COMPRISING: LEFT- AND RIGHT-HAND FORE-AND-AFT EXTENDING LIFT ARMS DISPOSED ON OPPOSITE SIDES OF THE TRACTOR AND HAVING ONE OF THEIR ENDS ADAPTED FOR HORIZONTAL PIVOTAL CONNECTION TO THE TRACTOR AND EXTENDING LONGITUDINALLY FROM THE ENDS TO PORTIONS DISPOSED BEYOND AN END OF THE TRACTOR, EACH OF THE ARMS BEING COMPOSED OF AN OUTER U-SHAPED CHANNEL FACING INWARDLY AND A COMPLEMENTARY INNER U-SHAPED CHANNEL FACING OUTWARDLY AND JOINED BY UPPER AND LOWER CENTRAL FORE-AND-AFT EXTENDING WELDING BEADS FORMING THE ADJOINED U-SHAPED CHANNELS INTO A BOX-SHAPED CHANNEL; AND RIGID TRANSVERSE TUBULAR MEMBERS RIGIDLY JOINING THE PORTIONS OF THE LEFT- AND RIGHT-HAND LIFT ARMS BEYOND THE END OF THE TRACTOR, EACH MEMBER HAVING OPPOSITE END PORTIONS EXTENDING THROUGH THE INNER AND OUTER CHANNELS OF THE LEFT- AND RIGHT-HAND LIFT ARMS BETWEEN THE UPPER AND LOWER BEADS WITH THE OUTER SURFACE OF EACH END PORTION BEING WELDED TO THE UPRIGHT FLANGES OF THE RESPECTIVE INNER AND OUTER CHANNELS.