Method and apparatus for forming an internally screw-threaded article
US4554962A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 10, 1984 |
| Grant date | Nov 26, 1985 |
| Priority date | — |
| Expiry date | Aug 10, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D25/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of casting or moulding an internally screw-threaded article comprises introducing casting or moulding material around two withdrawable flat core members which overlap within a mould cavity. The leading end face of each core member is formed with a male segment of the female screw thread to be formed in the article, the arrangement being that when the core members meet one another the two screw thead segments of the two core members are located to form two diametrally opposite segments of a male image of said female screw thread, withdrawing the core members from the mould cavity when the casting or moulding material has set and removing the cast article from the mould cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.