Apparatus for compressing foundry moulding material by means of compressed gas
US4846253A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 20, 1988 |
| Grant date | Jul 11, 1989 |
| Priority date | — |
| Expiry date | Jan 20, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C15/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An apparatus for the compression of foundry moulding material by compressed gas, which comprises a pressure tank for the compressed gas forming an inlet pressure zone, a moulding zone positioned beneath the same constituted by a moulding box with filling frame and pattern plate with pattern, onto which the moulding material is loosely poured prior to compression, and a large-area valve arranged between the pressure tank and the moulding zone. The closure member thereof frees the valve opening in the pressure tank in a few milliseconds and moves into the inlet pressure zone. The closure member is driven by a pressure cylinder, whose piston on the lift side forms the moveable termination of a gas-pressurized pressure reservoir and by its opposite side is connected to a high pressure source. The high pressure-side outflow is constructed in such a way that the pressure medium flows out at a speed of more than 10 m/s, accompanied by the simultaneous acceleration of the piston, under the pressure in the pressure reservoir and the closure member into the raised open position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.