Injection molding method, injection molding machine, injection molding die and half case of magnetic tape cassette
US5372770A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 19, 1992 |
| Grant date | Dec 13, 1994 |
| Priority date | — |
| Expiry date | May 19, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/1635
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention provides an injection molding die unit having a simple construction and an injection molding method employing the injection molding die unit and capable of molding a composite molding in a short cycle time. After molding a first molding (70), a male die (30) is moved together with the first molding (70) by a distance (Gb) in direction (L) and, at the same time, a movable female die (14B) of a composite female die (14) is moved by the same distance (Gb) in the same direction (L) by a coil spring (29) to form a space (72) between the male die (30) and the composite female die (14) consisting of the movable female die (14B) and a fixed female die (14A), and a second molding material is injected into the space (72) to form second molding (80).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.