Device for ejection of moulded pieces from a moulding tool
US7254979B2 · kind B2 · utility
0Cited by
9References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2002 |
| Grant date | Aug 14, 2007 |
| Priority date | — |
| Expiry date | Apr 10, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D45/02
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The invention relates to a so-called spring cushion (5), for the ejection of moulded pieces (4) from a moulding tool (3), with a plunger (6), moving in a guide tube (9) within the moulding tool and loaded in the ejection direction (14) by means of a spring (15). According to the invention, the spring (15) is embodied as a draw spring, in particular as a spiral draw spring. Considerably longer service life can be achieved as draw springs do not have radial deflections on loading.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.