Tire changing device

Claim 1

IN A DEVICE FOR SERVICING BEADED PNEUMATIC TIRES MOUNTED UPON A WHEEL, THE COMBINATION OF A PEDESTAL HAVING AN UPPER END PROVIDED WITH AN AREA FOR SUPPORTING A WHEEL IN TRANSVERSE RELATIONSHIP TO THE PEDESTAL AXIS, A RIGID CENTER POST PROJECTING FROM THE PEDESTAL ABOVE THE WHEEL-SUPPORTING AREA THEREOF, AND A COMBINATION WHEEL CENTERING AND LOCKING ELEMENT ROTATIONALLY SURROUNDING SAID POST, SAID ELEMENT INCLUDING AN INTERNALLY THREADED BORE IN WHICH THE POST IS RECEIVED, AND AT LEAST ONE EXTENDING PLUG PROJECTING LATERALLY FROM THE POST TO ENGAGE THE INTERNAL THREAD OF THE WHEEL CENTERING AND ROCKING ELEMENT AND THEREBY INDUCE AXIAL SHIFTING OF SAID ELEMENT INCIDENTAL TO ROTATION THEREOF, AND MEANS FOR ADJUSTING THE PLUG RELATIVE TO THE POST, FOR PRESENTING DIFFERENT AREAS OF THE PLUG TO SAID THREAD IN COMPENSATING FOR WEAR OF THE PLUG, WHEREIN THE PLUG IS IN THE FORM OF A SHORT CYLINDER HAVING AN EXPOSED END AND AN OPPOSITE END, THE POST BEING BORED TRANSVERSELY TO RECEIVE ROTATIONALLY SAID OPPOSITE END OF THE PLUG, AND THE ADJUSTING MEANS INCLUDES MEANS FOR FIXING THE PLUG TO THE POST IN SELECTED ROTATED POSITIONS OF THE PLUG WITHIN SAID BORE.