Two-stage ejection system for an injection mold
US6491512B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jan 25, 2001 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Jan 25, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/4005
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A two-stage ejection system for an injection mold that allows the mold plates to move at the same time and then allows selected plates to be stopped in a locked position while the other plates continue to move. The system includes an external bushing, an internal bushing that carries cam retainers, and an ejector pin. The system may be used in an injection mold having in sequence a stationary plate, a stripper plate, a support plate and an ejection plate. The external bushing is secured to the support plate, the internal bushing is secured to the stripper plate, and the ejector pin is secured to the ejection plate. The cam retainers selectively engage grooves in the external bushing or ejector pin to lock their respective attached plates from moving with respect to each other while the other plates continue to move.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.