Insert molding method for a seal member

Details Insert molding method for a seal member Insert molding method for a seal member

1992-06-09

1993-12-21

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With step of making mold or mold shaping, per se

264255, 2642791, B29C 3376, B29C 4514, B29C 4516

Patent

active

052718808

ABSTRACT:
A method for encapsulating a seal member insert with plastic material has been provided in which the seal member insert is located precisely in a molded outer housing. There is provided an elongated mold core element having an undercut area at substantially its intermediate area. A first molten plastic is injected around the core element on each side of the undercut area so as to form annular retainer rings. The seal member insert is provided into the undercut area between the annular retainer rings. A second molten plastic is injected around the core element, the annular retainer rings, and the seal member insert so as to form the molded outer housing. The core element is then extracted so as to form a seal-insert molded product. The annular retainer rings serve as wall members so as to prevent the seal member insert from being moved out of the undercut area and into an undesired location when the second molten plastic is being injected.

REFERENCES:
patent: 3668779 (1972-06-01), Turner
patent: 4686766 (1987-08-01), Dubbs et al.
patent: 4983344 (1991-01-01), Brown

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