Molding processes and apparatus and a molded product

• US 6,103,165 A
• Filed: 04/22/1997
• Issued: 08/15/2000
• Est. Priority Date: 04/26/1996
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Bandai
• Original Assignee: Kabushiki Kaisha Bandai
• Inventors: Miura, Kazunori
• Primary Examiner(s): Silbaugh, Jan H.
• Assistant Examiner(s): McDowell, Suzanne E.
• Application Number:
  US08/841,410
• Time in Patent Office: 1,211 Days
• Field of Search: 264/250, 264/255, 264/275, 264/279, 264/273, 264/274, 425/125
• US Class Current: 264/250
• CPC Class Codes: B29C 45/1615 The materials being injected at different moulding stations
• CPC Class Codes: B29C 45/2681 with rotatable mould parts

Abstract

To provide a molding apparatus and a molding process which enable a primary product molded in a primary mold to be held in a secondary mold stably, so that the primary product may not be displaced by a synthetic resin material injected into the secondary mold. If a synthetic resin material is injected into a primary mold cavity 173 in a primary mold 85 into which molding protrusions 187 project, there is molded a primary product 340 having engaging holes 191 formed on its surface. Protrusions 227 projecting into a secondary mold cavity 225 in a secondary mold 87 are engaged in the engaging holes 191 of the primary product 340 to secure it in the secondary mold cavity 225, and a synthetic resin material is injected into the secondary mold cavity 225 to mold a secondary product 361 having through holes made by the engaging protrusions 227 formed on its surface through which the engaging protrusions 227 are removable.

Claims

1. A molding process comprising:

(a) a first molding step of molding a primary product by injecting a first synthetic resin material into a primary mold cavity of a primary mold, said primary mold cavity having inwardly projecting protrusions so that said primary product has holes formed on the surface thereof;

(b) a second molding step of securing said primary product in a secondary mold cavity of a secondary mold by engaging protrusions inwardly projecting in said secondary mold cavity into said holes of said primary product molded in said first molding step; and

(c) said second molding step includes a step of molding a secondary product having through holes on its surface, said holes being made by said protrusions inwardly projecting in said secondary mold cavity, by injecting a second synthetic resin material into said secondary mold cavity, while said primary product is secured therein.