Magnetizing and demagnetizing tool

Details Magnetizing and demagnetizing tool Magnetizing and demagnetizing tool

1978-04-26

1979-07-03

Miller, J D

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

361149, H01F 1300

Patent

active

041602838

ABSTRACT:
A magnetizable iron core is surrounded by a magnetizing solenoid coil which can be energized by 60 hertz regular house power. An article of magnetizable material to be magnetized is placed adjacent the core and the solenoid coil is energized. A normally closed dwell switch in series with the solenoid coil is activated by the magnetization of the iron core to move to an open condition to interrupt flow to the solenoid after first permitting current to flow in said solenoid coil momentarily. Upon sucn interruption of current flow to the solenoid, the article is magnetized. To demagnetize an article, it is put in contact with the iron core, and means is provided to override the dwell switch. The solenoid coil is continuously energized. The article to be demagnetized is then moved away from the iron core. The resulting decreasing alternating current field completely demagnetizes the article.

REFERENCES:
patent: 575679 (1897-01-01), Hussey
patent: 2125628 (1938-08-01), Fredrickson
patent: 2996863 (1961-08-01), Odell
patent: 3086148 (1963-04-01), Soneki
patent: 3303398 (1967-02-01), Barta et al.
patent: 3467926 (1969-09-01), Smith
patent: 3662303 (1972-05-01), Arllof

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