Method of manufacturing bathtubs and the like using molding appa

Details Method of manufacturing bathtubs and the like using molding appa Method of manufacturing bathtubs and the like using molding appa

1990-05-15

1992-03-24

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264259, 264320, 264325, 264338, B29C 4120, B29C 4318

Patent

active

050986295

ABSTRACT:
A method for providing a coating upon a metal small or the like through the use of an injection molding process includes the use of a resilient, molded insert. The shell is positioned within a mold receptor such that a void is defined between the outer surface of the shell and the inner surface of the mold receptor. A hardenable material is injected into this void, thereby coating the outer surface of the shell. In order to prevent distortion or other damage to the shell due to pressure exerted within the mold, a thin, resilient and substantially flat insert is placed upon the inner surface of the shell. A male mold member engages the insert during the molding process, thereby compressing it. The insert may be formed from a solidifiable material introduced in liquid form into a master shell which then receives the male mold member. Once the insert material solidifies, it nearly perfectly fills any voids which may exist between the male mold member and subsequent shells which may be positioned in the molding apparatus.

REFERENCES:
patent: 1618165 (1927-02-01), Boschelli
patent: 2471008 (1949-05-01), Pretty
patent: 3029765 (1962-04-01), Navikas
patent: 4024007 (1977-05-01), Jago et al.
patent: 4562032 (1985-12-01), Gaudreau
patent: 4664982 (1987-05-01), Genovese et al.
patent: 4740324 (1988-04-01), Schur
patent: 4795600 (1989-01-01), Kromrey
patent: 4876042 (1989-10-01), Imataki et al.

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