Patent ID: 7258403

Claim:
A demountable rim assembly for use with a vehicle having a spare inner wheel associated therewith and adapted to receive a tire having an inner surface thereon for engagement with the inner surface of the tire, including in combination: a rim body comprised of at least two complementary annular parts of which both annular parts provide side holding rims structurally arranged to engage the tire mounted thereon; said at least two complementary annular parts being provided with reciprocal coupling means structurally arranged therebetween to permit engagement of said complementary annular parts to one another to provide support for the spare inner wheel and to permit engagement of the spare inner wheel with the inner surface of the tire when in the run flat condition; and wherein said reciprocal coupling means includes a plurality of threaded sectors on the edge of the perimeter of said annular parts of the rim assembly, with one of said annular parts having an elevated stop member associated with said threaded sectors and a recessed non-threaded sector associated with said threaded sectors, with said threaded and non-threaded sectors having the same width, such that when said complementary annular parts are inserted one into the other a threaded rotating movement therebetween fixes one to the other.