Sealing device for molten metal valve pin
US5798051A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 29, 1996 |
| Grant date | Aug 25, 1998 |
| Priority date | — |
| Expiry date | Mar 29, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D41/16
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A sealing arrangement for the molten metal portion of a lost core molding assembly includes a cooling chamber placed adjacent an opening of a heated nozzle chamber. The cooling chamber includes a generally cylindrical passageway that is aligned with the opening in the heated chamber distant from a tip of the nozzle. The generally cylindrical passage includes a reservoir, of a preselected axial length, for collecting a portion of the molten material that is allowed to enter into the passage. The collected material is cooled and solidified within the reservoir in order to form a generally annular bushing around a moving member that moves through the passage and the opening in the heated chamber while still permitting the moving member to move in a controlled manner. The annular bushing that is formed is self-repairing as additional molten material contacts the bushing and solidifies as part of the bushing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.