Magnetic anchoring apparatus

Claim 2

Magnetic apparatus for holding ferromagnetic pieces, comprising: magnetopermanent cores defining a magnetic circuit having a work surface and including a first non-reversible magnetopermanent core of an anisotropic ceramic type material, a second reversible magnetopermanent core member of a melted type anisotropic material having a magnetic remanence greater than twice the magnetic remanence of said first core and a coercitivity less than one-third of said first core; a magnetic yoke defining part of said work surface and coacting with said first and second magnetopermanent cores; a polarization inverting solenoid surrounding said second reversible core for generating electromagnetic fields for inverting the polarization of said second core and respectively activating or deactivating said work surface; said non-reversible core is interposed between said yoke and an indirect induction polar element to form a direct induction polar element, said first non-reversible core having a direction of magnetization perpendicular to said polar elements; said second reversible core member is aligned with said yoke and has a direction of magnetization perpendicular to said first non-reversible core; and further comprising a ferromagnetic crown common to said polar elements and opposite said work surface.

Claim 3

Magnetic apparatus for holding ferromagnetic pieces, comprising: magnetopermanent cores defining a magnetic circuit having a work surface and including a first non-reversible magnetopermanent core of an anisotropic ceramic type material, and a second reversible magnetopermanent core member of a melted type of anisotropic material having a magnetic remanence greater than twice the magnetic remanence of said first core and a coercitivity less than one-third of said first core; a magnetic yoke defining part of said work surface and coacting with said first and second magnetopermanent cores; a polarization inverting solenoid surrounding said second reversible core for generating electromagnetic fields for inverting the polarization of said second core and respectively activating and deactivating said work surface; said second reversible core is aligned with and has a direction of magnetization parallel to said yoke and including two non-reversible cores opposite said yoke and positioned between the latter and an associated indirect induction polar element; and said two non-reversible cores being arranged against said yoke with respective directions of polarization opposite to one another and perpendicular to the latter; and further comprising a ferromagnetic crown opposite said work surface.

Claim 4

Magnetic apparatus for holding ferromagnetic pieces, comprising: magnetopermanent cores defining a magnetic circuit having a work surface and including a first non-reversible magnetopermanent core of an anisotropic ceramic type material, and a second reversible magnetopermanent core member of a melted type of anisotropic material having a magnetic remanence greater than twice the magnetic remanence of said first core and a coercitivity less than one-third of said first core; a magnetic yoke defining part of said work surface and coacting with said first and second magnetopermanent cores; a polarization inverting solenoid surrounding said second reversible core for generating electromagnetic fields for inverting the polarization of said second core and respectively activating and deactivating said work surface; said second reversible core is aligned with and has a direction of magnetization parallel to said yoke and including two non-reversible cores opposite said yoke and positioned between the latter and an associated indirect induction polar element; and said two non-reversible cores being arranged against said yoke with respective directions of polarization opposite to one another and perpendicular to the latter; and further comprising a ferromagnetic crown opposite said work surface.

Claim 5

Magnetic apparatus for holding ferromagnetic pieces, comprising: magnetopermanent cores defining a magnetic circuit having a work surface and including a first non-reversible magnetopermanent core of an anisotropic ceramic type material, and a second reversible magnetopermanent core member of a melted type anisotropic material having a magnetic remanence greater than twice the magnetic remanence of said first core and a coercitivity less than one-third of said first core; a magnetic yoke defining part of said work surface and coacting with said first and second magnetopermanent cores; a polarization solenoid surrounding said reversible core for generating electromagnetic fields for inverting the polarization of said second core and respectively activating or deactivating said work surface; a plurality of first polar elements spaced apart from one another; a ferromagnetic support common to said first polar elements; a plurality of second polar elements alternately interposed between said first polar elements and defining slots parallel to one another, each defining a common magnetic yoke; said reversible core member being surrounded by a respective inverting electromagnet and arranged between each of said second polar elements and said ferromagnetic support; said non-reversible core arranged in each of said slots with a polarization direction perpendicular to said polar elements thereby defining a work surface activated by polar elements alternately of opposite polarity; said polar elements and said reversible core member being secured by fastening screws; and spacers of paramagnetic material being superimposed with respect to said non-reversible core member and locked by a transverse tie-rod.

Claim 6

Magnetic apparatus for holding ferromagnetic pieces, comprising: magnetopermanent cores defining a magnetic circuit having a work surface and including a first non-reversible magnetopermanent core of an anisotropic ceramic type material, and a second reversible magnetopermanent core member of a melted type anisotropic material having a magnetic remanence greater than twice the magnetic remanence of said first core and a coercitivity less than one-third of said first core; a magnetic yoke defining part of said work surface and coacting with said first and second magnetopermanent cores; a polarization solenoid surrounding said reversible core for generating electromagnetic fields for inverting the polarization of said second core and respectively activating or deactivating said work surface; a plurality of first polar elements spaced apart from one another; a ferromagnetic support common to said first polar elements; a plurality of second polar elements alternately interposed between said first polar elements and defining slots parallel to one another, each defining a common magnetic yoke; said reversible core member being surrounded by a respective inverting electromagnet and arranged between each of said second polar elements and said ferromagnetic support; said non-reversible core arranged in each of said slots with a polarization direction perpendicular to said polar elements thereby defining a work surface activated by polar elements alternately of opposite polarity; said polar elements and said reversible core member being secured by fastening screws; and spacers of paramagnetic material being superimposed with respect to said non-reversible core member and locked by a transverse tie-rod.

Claim 7

An apparatus according to claim 3, wherein said polar elements extend beyond said non-reversible core member to the apparatus work surface.

Claim 8

An apparatus according to claim 3, wherein the empty spaces between the parts comprising the apparatus are filled with an epoxy resin.