Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Work or object holding type
Patent
1994-06-16
1995-01-17
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Work or object holding type
335295, H01F 702, H01F 704, B66C 104
Patent
active
053829352
ABSTRACT:
A magnetic grab has a pair of vertically elongated magnetic pole pieces each having an upper end and a lower end. The pole pieces diverge downward symmetrically with respect to a vertical symmetry plane with the upper ends substantially more closely spaced than the lower ends. A plurality of nonmagnetic elements fixed to the pole pieces secure same together and a generally cylindrical rotor engaged between the pole pieces and centered on and rotatable about a rotor axis extending horizontally parallel to and between the pole pieces is formed by a pair of soft-iron bodies one of which is substantially thicker in a direction transverse to the axis than the other. One or more permanent magnets are sandwiched between the bodies and polarized generally diametrically of the rotor axis. The rotor can be turned between an active position with one of the bodies juxtaposed with one of the pole pieces and the other body juxtaposed with the other pole piece and one of the bodies lying mainly to one side of the plane and the other body lying mainly to the other side of the plane and an inactive position with the plane generally bisecting both bodies and each body closely juxtaposed with both pole pieces.
REFERENCES:
patent: 4314219 (1982-02-01), Haraguchi
patent: 4465993 (1984-08-01), Braillon
patent: 5166654 (1992-11-01), Doyelle
Barrera Raymond M.
Braillon Magnetique
Dubno Herbert
Picard Leo P.
Wilford Andrew
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