Screw extractor
US4389913A · kind A · utility
13Cited by
6References
3Claims
0Family size
Inventors
Key dates
| Filing date | Mar 3, 1981 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | Mar 3, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/859
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A tool for use in removing broken or inoperative screw fasteners. The tool has a tubular-shaped extension at one end with cutting teeth projecting axially from the extension. The teeth can cut around a fastener when the tool is rotated in one direction to provide a stub end on the fastener over which the extension fits. The extension is then tightened on the stub end and teeth, extending radially inwardly from the extension, tightly grip the stub end so that the fastener can be unscrewed on reverse rotation of the tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.