BATHTUB, CAST MOLDING METHOD FOR FORMING THE SAME, AND MOLD APPARATUS FOR FORMING THE SAME BY CAST MOLDING

摘要

PROBLEM TO BE SOLVED: To provide a bathtub having a reinforcement rib formed by reducing generation of residual air, and a cast molding method and mold apparatus for molding the same.;SOLUTION: A bathtub 1 formed by cast molding is integrally provided with: a reinforcement rib 6 formed on the lower surface 4 of the bottom 3 of a body 2 in order to reinforce the bottom 3; and a downwardly-protruding protrusion 8 formed at the lower end 7 of the protrusion of the reinforcement rib 6. The protrusion 8 is composed of the remains of an air reservoir part 21 for collecting air inside a casting cavity 17 thereinto and formed by injecting a resin 30 into the air reservoir part 21.;COPYRIGHT: (C)2012,JPO&INPIT