Drill support
US5275514A · kind A · utility
17Cited by
1References
10Claims
0Family size
Assignees
Inventor
Key dates
| Filing date | Dec 9, 1992 |
| Grant date | Jan 4, 1994 |
| Priority date | — |
| Expiry date | Dec 9, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/554
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A portable workpiece-mounted machine tool such as a drill is provided with a permanent-electromagnet attaching unit which has its reversible permanent magnets alternating with nonreversible permanent magnets so that, when electric current is applied to the reversible magnets, they are subjected to polarity reversal which causes flux closure through a workpiece of the reversible and nonreversible magnets in the "on" position and causes flux closure between a reversible and nonreversible magnet in an "off" position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.