Quick magnetizing and demagnetizing device for screwdrivers
US6249199A · kind A · utility
Inventor
Key dates
| Filing date | Apr 10, 2000 |
| Grant date | Jun 19, 2001 |
| Priority date | — |
| Expiry date | Apr 10, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F13/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Quick magnetizing and demagnetizing device for screwdrivers, including two symmetrical outer casings mated with each other and two sintered magnets. The upper and a lower sections of the interior of each of the outer casings are respectively formed with two receiving cavities. With the identical poles opposite to each other, the two sintered magnets are respectively received in the upper and lower receiving cavities of the outer casings. The engaging ribs formed in the receiving cavities engage with and fix the sintered magnets therein. When a screwdriver with magnetism is abraded back and forth against the demagnetizing face of the outer casings and at the same time rotated, the screwdriver is demagnetized for use in computer equipment or sophisticated instrument. When the demagnetized screwdriver is fitted into the screwdriver socket of the outer casings between the two sintered magnets and abraded back and forth therein and rotated at the same time, the magnetism of the screwdriver is restored. Therefore, the screwdriver can be quickly and conveniently demagnetized and magnetized. The quick magnetizing and demagnetizing operation can be easily performed and the application range…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.