Patent ID: 6293324
Filing Date: 2001-09-25
Classification: B60B

Abstract:
In a steel wheel rim for an industrial vehicle having a substantially cylindrical rim base including first and second opposed annular edges,a first rim back flange formed on a first annular edge of said rim base and forming with said rim base a first L-shaped concave bearing surfacea bead seat telescopically mounted on said rim base at said second annular edge of said rim base,a second rim back flange formed on said bead seat and forming with said bead seat a second L-shaped concave bearing surface,a back side ring telescopically and rotatably mounted on said rim base and bearing against said first concave bearing surface,a front side ring telescopically mounted on said bead seat and bearing against said second concave bearing surface,said back and front side rings each being formed with an inner annular bearing surface for bearing against said rim base or said bead seat a convex annular bead support surface for supporting the bead of a tire, and a side bearing surface opposed to said convex annular bead support surface intersecting said inner annular bearing surface,said inner annular bearing surface and said side bearing surface of each of said side rings forming an L-shaped in cross section, convex annular bearing surface each sized and shaped to nest with said concave bearing surfaces of said rim base and said bead seat,the improvement therein comprising:at least one of said concave bearing surfaces and the convex bearing surface of its side ring both being coated with a metallic carbon layer of a hardness greater than the hardness of said steel of said wheel rim and said side rings.