Safety interlock for electro-magnetic drill stand
US4278371A · kind A · utility
31Cited by
6References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 29, 1980 |
| Grant date | Jul 14, 1981 |
| Priority date | — |
| Expiry date | Feb 29, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/554
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An electromagnetic drill stand, of the type having a drill driven by an electric motor and mounted on a stand provided with an electromagnetic coil in the bottom of the stand to secure the stand to ferromagnetic material when the coil is energized, is provided with switch means preventing operation of the motor when the coil is not energized, said switch means being mounted in proximity to said coil and responsive to the magnetic flux of the coil for controlling the power supply to the motor and operative to interrupt the power supply in absence of a predetermined flux density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.