A flexible shaping ring for shaping heat softened glass sheets lifts a heat softened glass sheet and presses it against the shaping surface of an upper mold. As the shaping ring presses the marginal edge portion of the sheet against the upper mold, its shaping surface deforms to generally conform to...http://www.google.es/patents/US5649990?utm_source=gb-gplus-sharePatente US5649990 - Combination flexible/rigid ring mold
