Moulding flask for vacuum sealed moulding process
US3952793A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1974 |
| Grant date | Apr 27, 1976 |
| Priority date | — |
| Expiry date | Nov 26, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H54/84
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Moulding flask adapted to be used in a process for forming a mould comprising steps of disposing, at the opening of the moulding flask, a pattern having a shield membrane of synthetic resin on the outer surface thereof, filling the space defined between the moulding flask and the pattern with particulate filler material such as sand, and applying negative pressure to the filler material so that the filler material is subjected to an external pressure to make a mould, said moulding flask having at least one surface on an intermediate partition surface formed by an impervious resilient membrane which is supported by a support member whereby, when the filler material is subjected to the negative pressure, the external pressure is applied to the resilient membrance which then presses the filler material so as to enhance compacting of the mould thus producing a strong and precise casting mould.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.