Self-cleaning ejector-filter
US4113000A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1977 |
| Grant date | Sep 12, 1978 |
| Priority date | — |
| Expiry date | Apr 14, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C7/065
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A combination device permitting filtering of an air-sand mixture or an air-metal liquid mixture at the moment of filling a foundry mold, as well as ejection of the molded part, wherein a filtering element, composed of a spiral spring with spaces between its turns, is mounted and centered in the mold. This filtering element centers and guides an ejector, driven by an ejection striker plate. In the process of ejection, the elongation of the spring widens the spaces between its turns, thus freeing bits of sand or metal caught between the turns, to provide self-cleaning. The device can be used in foundries to make mold cores and to mold light-alloy parts by gravity or low pressure in metal molds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.