Stripper mechanism for injection mold
US4207051A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1979 |
| Grant date | Jun 10, 1980 |
| Priority date | — |
| Expiry date | Jan 11, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2045/4047
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An injection-molding machine has a fixed and a movable outer platen bracketing a movable intermediate platen, the latter having a runner system conducted via an extensible or flexible conduit to a source of molten plastic material to be injected into cavities defined by respective pairs of mold portions supported by the three platens, the cavities being formed in part by cores carried on the outer mold portions. A stripper plate inserted between each pair of mold portions is articulated via a spring-loaded lost-motion link to a respective eccentric pin on a pinion which is rotatably mounted on the intermediate platen and meshes with a pair of racks respectively secured to the two outer platens; this linkage is duplicated on opposite sides of the mold. In an initial phase of a mold-opening stroke, the stripper plates move outwardly under spring pressure while remaining in contact with their respective outer mold portions whose cores still retain the freshly molded articles. When the limit of the lost-motion travel is reached, the stripper plates are slowly lifted off their adjoining mold portions to detach the molded articles from the cores.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.