US Patent 7361296 Motor vehicle wheel frame

A motor vehicle wheel frame is integrally molded in a split mold including a lower mold portion (12) and a complemental mold portion. Channel-like spoke forming formations (12.1) receive layers (24.1) of molding material wrapped around heat expanding, resilient intensifiers (20) which are inwardly checked by resilient locking inserts (22) partially within a hub cavity and abutting a cylinder (18). During demolding, after curing, the locking inserts (22) and thereafter the intensifiers (20) are removed by longitudinally stretching and cross-sectionally reducing them, leaving the spokes hollow. During curing, the heat expanding intensifiers pressurize the spoke forming layers of molding material against the mold portions.