Magnetic work-holding device
First Claim
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1. A magnetic work-holding device comprising:
- pole pieces fed by magnets and defining a work-holding surface for one or more work-pieces, there being at least two pole pieces fed by a main permanent magnet means disposed therebetween, at least two corresponding sides of each of said pole pieces cooperating with a secondary permanent magnet means, the secondary magnet means being magnetized in a direction to present to the pole of the same sign as the cooperating pole of the main magnet means, and an external ferromagnetic yoke short-circuiting the remaining poles of the secondary magnet means, at least one of said magnet means being invertible in magnetic field to activate or deactivate said work-holding surface.
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Abstract
A magnetic work-holding device with at least two pole shoes defining a work surface, and a main magnetic core interposed between the two aforementioned shoes; the other sides of the pole shoes are fed by secondary magnetic elements whose poles facing the same pole shoe, have the same sign as the pole corresponding to the main magnetic core. A ferromagnetic yoke encircles the base and the sides of the equipment, short-circuiting the remaining poles of the secondary magnetic elements.
17 Citations
8 Claims
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1. A magnetic work-holding device comprising:
- pole pieces fed by magnets and defining a work-holding surface for one or more work-pieces, there being at least two pole pieces fed by a main permanent magnet means disposed therebetween, at least two corresponding sides of each of said pole pieces cooperating with a secondary permanent magnet means, the secondary magnet means being magnetized in a direction to present to the pole of the same sign as the cooperating pole of the main magnet means, and an external ferromagnetic yoke short-circuiting the remaining poles of the secondary magnet means, at least one of said magnet means being invertible in magnetic field to activate or deactivate said work-holding surface.
- View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A magnetic work-holding device comprising at least two pole pieces each having one side defining a work-holding surface for one or more work-pieces, a main permanent magnet disposed between said pole pieces, reversible permanent magnet means encircled by electric windings each disposed with one pole in contact with the opposite side of said two pole pieces, and secondary magnet means in contact with at least one lateral side of each pole piece, said main and secondary magnets being magnetized in a direction to present to each said pole piece a pole of the same sign, and an external ferromagnetic yoke short-circuiting the remaining poles of said reversible and secondary magnets.
Specification