Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Including housing
Patent
1988-05-20
1990-10-23
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Including housing
361144, 361147, 335290, 335291, 335294, 340666, H01F 704
Patent
active
049656953
ABSTRACT:
Permanent magnetic retaining device to move, affix or carry ferromagnetic parts or load with electronic switching of the magnetic flux to release the carried load includes a central iron core enclosed by a pair of magnet blocks secured by iron shoes, laterally joined to reinforcing plates and terminated by lateral poles with one or more compensator coils being disposed on the central core, with a sliding cover above the former, moving on a pair of guide pins surrounded by mechanical force gauges, the cover being centrally provided with a lifter eyelet. An electronic control circuit is incorporated externally in one of the side walls of a rectangular enveloping overcover wherein, at the opposite side thereof, a sensor of the electronic circuit is incorporated, to be operated manually and/or by remote control.
REFERENCES:
patent: 1335119 (1920-03-01), Louis
patent: 3316514 (1967-04-01), Radus et al.
patent: 3389356 (1968-06-01), Schneider
patent: 3798581 (1974-03-01), Anderson et al.
patent: 4112750 (1978-09-01), Murakami
patent: 4542361 (1985-09-01), Cavanagh
patent: 4633361 (1986-12-01), Ela et al.
Osborn David
Pellinen A. D.
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