Heavy duty chuck

Claim 1

AN INFLATION SUPPORT FOR A TIRE COMPRISING IN COMBINATION FIRST AND SECOND TELESCOPING CHUCK RING MEMBERS HAVING FIRST AND SECOND RADIAL FLANGES FOR SUPPORTING A TIRE BETWEEN THEM; A CIRCULAR LOCKING SURFACE SURROUNDING A CENTRAL OPENING AND ON AN INNER WALL OF ONE OF THE MEMBERS; LOCKING MEANS FORMING PART OF THE OTHER MEMBER AND PASSABLE THROUGH SAID OPENING WHEN THE CHUCK RING MEMBERS ARE BEING TELESCOPED, SAID LOCKING MEANS SO PASSABLE THROUGH SAID OPENING INCLUDING A CENTRAL PROJECTION OF SAID OTHER MEMBER, A PLURALITY OF OPEN GROOVES DISPOSED ABOUT THE PERIPHERY OF THE PROJECTION, SAID GROOVES HAVING CYLINDRICAL BOTTOM BEARING SURFACES AND A LOCKING MEMBER PIVOTALLY MOUNTED IN EACH GROOVE, EACH LOCKING MEMBER INCLUDING A LOCKING PORTION HAVING ONE END BEARING AGAINST THE BOTTOM OF A GROOVE AND EXTENDING FROM THE GROOVE TOWARD SAID ONE CHUCK MEMBER, SAID GROOVES BEING FARTHER AWAY FROM THE RADIAL FLANGE ON SAID OTHER CHUCK RING MEMBER THAN SAID CIRCULAR LOCKING SURFACE WHEN THE CHUCK RING MEMBERS ARE FULLY TELESCOPED INTO LOCKING POSITION SO THAT SEPARATION OF THE CHUCK RING MEMBERS REQUIRES THE LOCKING SURFACE TO APPROACH THE GROOVES AND SAID LOCKING PORTIONS BEING POSITIONABLE BETWEEN SAID GROOVES AND SAID CIRCULAR LOCKING SURFACE WHEN SAID CHUCK RING MEMBERS ARE FULLY TELESCOPED; AND MEANS FOR SELECTIVELY PIVOTING EACH OF SAID LOCKING PORTIONS IN ITS GROOVE BETWEEN TWO POSITIONS, ONE POSITION BEING RADIALLY INSIDE THE PATH TRAVERSED BY THE CIRCULAR LOCKING SURFACE AS THE MEMBERS ARE BEING TELESCOPED, AND THE OTHER POSITION BEING BETWEEN ITS GROOVE AND THE CIRCULAR LOCKING SURFACE SO THAT THE LOCKING PORTIONS WHEN IN THE SECOND POSITION RESIST FORCES EXERTED TOWARD THE BEARING GROOVES BY THE CIRCULAR LOCKING SURFACE.