Formed wheel tire and method

Abstract

The main distinctive feature of the new design is that the rim has an O-shape of cross-section instead of the conventional U-shape (channel) of cross-section to hold a solid of filled tire is disclosed. The rim assembly or disc type of wheels, for example as one shown in FIG. 2, consists of two half pieces, separating along a central plane. The half pieces are first molded and then are bonded to form a light, hollow and strong rim and wheel assembly. A wheel assembly having a solid tire is made by pouring formed polymer materials such as polyurethane into a rotating mold in which the rim assembly is used as an insert. Use of rotating/reaction casting method can achieve a very high productivity. Optionally a double shot molding may be employed to concentrate strong rigid material such as glass filled nylon in the flat cone and softer polypropylene in the rim.

Dependencies are inferred from the claim text.