Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Work or object holding type
Patent
1984-05-22
1986-03-11
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Work or object holding type
335288, 335295, H01F 720
Patent
active
045757020
ABSTRACT:
A permanent magnetic chuck in which a workpiece holding plate comprises a plurality of permanent magnets each with a magnetic isolator which are alternatively laminated, said magnetic pole pieces and said magnetic isolator are respectively constructed as layers of a plurality of thin magnetic layers and a plurality of thin non-magnetic layers each of which is disposed alternately with each of said magnetic layers; and a sliding magnet member which comprises a plurality of disk-shaped permanent magnets disposed in round holes provided in said member at the same pitch as the lamination pitch of the workpiece holding plate is disposed. The permanent magnets of the workpiece holding plate are so disposed that the same magnetic poles of the adjacent magnets are opposed to each other. The permanent magnets of the sliding magnet member are so disposed that the magnetic lines of flux pass vertically and that the opposite magnetic poles of the adjacent permanent magnets are opposed to each other.
REFERENCES:
patent: 3039026 (1962-06-01), Levesque
patent: 3078565 (1963-02-01), Sanders
patent: 3228133 (1966-01-01), Baermann
patent: 4075589 (1978-02-01), Braillon
patent: 4122922 (1978-10-01), Baermann
patent: 4419644 (1983-12-01), Baermann
patent: 4468649 (1984-08-01), Matsuhashi
Iwasaki Hiroshi
Nitta Takeshi
Fuji Jiko Kabushiki Kaisha
Harris George
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