Magnetic gripping apparatus having circuit for eliminating resid

Details Magnetic gripping apparatus having circuit for eliminating resid Magnetic gripping apparatus having circuit for eliminating resid

1989-05-26

1990-09-11

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Work or object holding type

335295, H01F 720

Patent

active

049566253

ABSTRACT:
A magnetic gripping apparatus, of the permanent magnet type, comprising a base plate and peripheral walls, at least a first and a second pole units, each pole unit comprising a main pole piece having an outer face defining a gripping surface, main permanent magnets arranged between said main pole pieces and said base plate, an intermediate pole member between said first and second pole units, said intermediate pole member extending from the base plate to the gripping surface and secondary magnets between the pole members and the pole pieces; a first electrical windings encircles each main magnet, said electrical winding being operatively conected to a control unit, and a residual flux eliminating circuit comprising a second electrical winding encircling said intermediate pole member, said second winding being operatively connected to a demagnetizing control unit.

REFERENCES:
patent: 675323 (1901-05-01), Clark
patent: 2213007 (1940-08-01), Karasick
patent: 2445459 (1948-07-01), Snyder
patent: 3740683 (1973-06-01), Benson
patent: 3978441 (1976-08-01), Sobottka et al.
patent: 4015174 (1977-03-01), Cotton de Bennetot
patent: 4141547 (1979-02-01), Duquenne et al.
patent: 4847582 (1989-07-01), Cardone et al.
Abstract of Japan Appl. 58-186910, "Magnetic Attracting Apparatus", vol. 8, No. 25 (E-225), Feb. 2, 1984.

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