Fluid cooled hydraulic actuating mechanism for single cavity injection molding
US4755131A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 5, 1987 |
| Grant date | Jul 5, 1988 |
| Priority date | — |
| Expiry date | Mar 5, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/281
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention relates to a valve gated single cavity injection molding system wherein the valve pin actuating mechanism is cooled by circulating hydraulic fluid through it. The cylinder is mounted in a cylinder housing inside a dome portion of a heated manifold housing. The cylinder housing has a wing portion extending out openings in each side of the manifold housing. Each wing portion has an inlet duct and an outlet duct for hydraulic fluid across which a pressure differential is applied. The ducts connect to circumferential channels which extend around the outside of the cylinder and lead to respective openings into the cylinder. Thus, the application of hydraulic fluid pressure during operation circulates hydraulic fluid through the actuating mechanism. The cooling which results extends the operating life of the mechanism, particularly the seals and O-rings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.