Method and apparatus for injection molding
US5114655A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 16, 1990 |
| Grant date | May 19, 1992 |
| Priority date | — |
| Expiry date | Oct 16, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/058
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus are described for forming a closure device having a cylindrical plug and a cylindrical collar extending coextensively and coaxially from a cap. The apparatus includes an outer mold defining an injection mold cavity. A cylindrical hollow outer core extends into the injection mold cavity and a cylindrical inner core extends into the injection mold cavity within the hollow outer core. Pushing means separate the molded part from the inner core. A stripper separates the part from the outer core by engaging an annular shoulder on the part. The part is pushed free of the mold's inner core after the outer mold is removed but before the stripper is advanced to engage the annular shoulder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.