Ejector pin assembly for injection moulding tools
US3963209A · kind A · utility
Inventor
Key dates
| Filing date | Aug 21, 1974 |
| Grant date | Jun 15, 1976 |
| Priority date | — |
| Expiry date | Aug 21, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/4005
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
In an ejector pin assembly for injection moulding tools the ejector pin plate is positively retracted and locked in its rear position by providing the tool with a rearwardly extending hollow housing, having an inner annular pocket, by slidably arranging in said housing a slidable member, being connected to the ejector pin plate and having radial holes for receiving cupling elements such as balls, segments or the like, by arranging in said housing a spring operated member, which normally prevents the coupling elements from penetrating said sliding member inwardly and by securing to the generally stationary ejector means of the injection moulding machine an ejector rod, which near its free end has an annular groove into which said coupling elements may enter when said rod has been introduced in the housing and the spring operated member as a consequence thereof has been displaced such that it does not any longer cover said openings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.