# US 12,112,889 B2 · Magnetic coupling device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,112,889 B2 - Document ID: US12112889B2 - Status: Granted - Kind: B2 - Application number: 18/288,140 - Filed: 2022-05-27 - Published: 2024-03-14 - Granted: 2024-10-08 - Earliest claimed: 2021-05-28 - Assignees: Magswitch Technology, Inc. - Applicants: Magswitch Technology, Inc. - Inventors: David H. Morton - Web page: https://patentgrep.com/patent/US12112889B2 ## CPC - H01F 7/0252: {PM holding devices (H01F7/021, H01F7/0215, H01F7/0226 take precedence)} - H01F 7/04: Means for releasing the attractive force - B23Q 3/154: Stationary devices - B23Q 3/1546: {using permanent magnets} - B25J 15/0608: {with magnetic holding means} - B66C 1/04: by magnetic means - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - B23Q: DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING (tools of the kind used in lathes or boring machines B23B27/00); MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT - B25J: MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES ({manipulators specially adapted for use in surgery A61B34/70; manipulators used in cleaning hollow articles B08B9/04}; manipulators associated with rolling mills B21B39/20; manipulators associated with forging machines B21J13/10; {manipulators associated with picking-up and placing mechanisms B23P19/007}; means for holding wheels or parts thereof B60B30/00; {vehicles with ground-engaging propulsion means, e.g. walking members B62D57/02, B62D57/032; devices for picking-up and depositing articles or materials between conveyors B65G47/90, B65G47/91; manipulators with gripping or holding means for transferring packages B65H67/065}; cranes B66C; {manipulators used in the protection or supervision of pipe-line installations F17D5/00; walking equipment adapted for nuclear steam-generators F22B37/006}; manipulators specially adapted for, or associated with, nuclear reactors G21C; {apparatus used for handling wafers during manufacture or treatment of semiconductor H10P72/50}) - B66C: CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES ({specially adapted for lifting invalids A61G7/10;} rope, cable, or chain winding mechanisms, braking or detent devices therefor B66D; specially adapted for nuclear reactors G21) ## Abstract Magnetic coupling devices are disclosed. The magnetic coupling devices may include sensors, retractable pins, stationary pins, probes, and/or additional tools. The magnetic coupling devices may include multiple sets of pole portions, a first set may be received in an opening in a first magnet of the magnetic coupling device and a second set may be outside of an envelope of the first magnet. ## Claims ### Claim 1 A magnetic coupling device for magnetically coupling to a ferromagnetic workpiece, comprising: a housing; a switchable magnetic flux source supported by the housing, the switchable magnetic flux source being switchable between at least an OFF state and an ON state; and a plurality of pole portions, each having at least one workpiece engagement surface, the switchable magnetic flux source being positioned between the plurality of pole portions and the plurality of pole portions including a first north pole portion having a first workpiece engagement surface, a second north pole portion having a second workpiece engagement surface, a first south pole portion having a third workpiece engagement surface, and a second south pole portion having a fourth workpiece engagement surface, wherein the second north pole portion and the second south pole portion are each positioned between the first north pole portion and the first south pole portion and the switchable magnetic flux source in an ON state is magnetically coupled to each of the first workpiece engagement surface of the first north pole portion, the second workpiece engagement surface of the second north pole portion, the third workpiece engagement surface of the first south pole portion, and the fourth workpiece engagement surface of the second south pole portion. ### Claim 2 (depends on 1) The magnetic coupling device of claim 1, wherein a channel is located between the first north pole portion and the first south pole portion. ### Claim 3 (depends on 2) The magnetic coupling device of claim 2, further comprising a sensor positioned in the channel. ### Claim 4 (depends on 2) The magnetic coupling device of claim 2, further comprising a tool positioned in the channel. ### Claim 5 (depends on 2) The magnetic coupling device of claim 2, further comprising one of a tool and a sensor positioned in the channel. ### Claim 6 (depends on 2) The magnetic coupling device of claim 2, wherein the channel extends from a first position above a top side of the switchable magnetic flux source to a second position below the top side of the switchable magnetic flux source. ### Claim 7 A magnetic coupling device for magnetically coupling to a ferromagnetic workpiece, comprising: a housing; a switchable magnetic flux source supported by the housing including a plurality of permanent magnets, the plurality of permanent magnets including a first permanent magnet and a second permanent magnet movable relative to the first permanent magnet, the first permanent magnet having a first end surface and a second end surface; a plurality of workpiece engagement surfaces supported by the housing and magnetically coupled to the switchable magnetic flux source, the plurality of workpiece engagement surfaces adapted to contact the ferromagnetic workpiece, the plurality of workpiece engagement surfaces comprising: a first workpiece engagement surface positioned adjacent the first end surface of the first permanent magnet, a second workpiece engagement surface positioned adjacent the second end surface of the first permanent magnet, each of the first workpiece engagement surface and the second workpiece engagement surface corresponding to a north pole of the magnetic coupling device; a third workpiece engagement surface; and a fourth workpiece engagement surface spaced apart from the third workpiece engagement surface, each of the third workpiece engagement surface and the fourth workpiece engagement surface corresponding to a south pole of the magnetic coupling device. ### Claim 8 (depends on 7) The magnetic coupling device of claim 7, wherein the third workpiece engagement surface is positioned adjacent the first end surface of the first permanent magnet and the fourth workpiece engagement surface is positioned adjacent the second end surface of the first permanent magnet. ### Claim 9 (depends on 7) The magnetic coupling device of claim 7, wherein the second permanent magnet is rotatable relative to the first permanent magnet. ### Claim 10 (depends on 9) The magnetic coupling device of claim 9, wherein a strength level of a magnetic field of the north pole of the magnetic coupling device is varied based on a rotational position of the second permanent magnet relative to the first permanent magnet. ### Claim 11 (depends on 10) The magnetic coupling device of claim 10, wherein the strength level of the magnetic field of the north pole of the magnetic coupling device is strongest when a north pole of the second permanent magnet is aligned with a north pole of the first permanent magnet and is weakest when the north pole of the second permanent magnet is aligned with a south pole of the first permanent magnet. ### Claim 12 (depends on 7) The magnetic coupling device of claim 7, wherein the first permanent magnet surrounds the first workpiece engagement surface and the third workpiece engagement surface. ### Claim 13 (depends on 7) The magnetic coupling device of claim 7, wherein each of the first permanent magnet and the second permanent magnet surrounds the first workpiece engagement surface and the third workpiece engagement surface. ### Claim 14 (depends on 7) The magnetic coupling device of claim 7, further comprising: a first pole member including the first workpiece engagement surface; a second pole member including the third workpiece engagement surface, the first pole member and the second pole member defining a channel; and at least one sensor positioned in the channel. ### Claim 15 (depends on 14) The magnetic coupling device of claim 14, wherein the second permanent magnet includes a top face and a bottom face, the bottom face facing the first permanent magnet, the at least one sensor is positioned lower than the top face of the second permanent magnet. ### Claim 16 (depends on 15) The magnetic coupling device of claim 15, wherein the at least one sensor is positioned lower than the bottom face of the second permanent magnet. ### Claim 17 A magnetic coupling device for magnetically coupling to a ferromagnetic workpiece, comprising: a housing; a switchable magnetic flux source supported by the housing including a plurality of magnets, the plurality of magnets including a first magnet and a second magnet, the switchable magnetic flux having a first configuration wherein a north pole of the second magnet is aligned relative to a north pole of the first magnet and a second configuration wherein a south pole of the second magnet is aligned relative to the north pole of the first magnet; and a plurality of workpiece engagement surfaces supported by the housing and magnetically coupled to the switchable magnetic flux source, the plurality of workpiece engagement surfaces adapted to contact the ferromagnetic workpiece, a first pole portion including a first workpiece engagement surface of the plurality of workpiece engagement surfaces, a second pole portion including a second workpiece engagement surface of the plurality of workpiece engagement surfaces, the first workpiece engagement surface and the second workpiece engagement surface corresponding to a north pole of the magnetic coupling device, a third pole portion including a third workpiece engagement surface of the plurality of workpiece engagement surfaces, a fourth pole portion including a fourth workpiece engagement surface of the plurality of workpiece engagement surfaces, the third workpiece engagement surface and the fourth workpiece engagement surface corresponding to a south pole of the magnetic coupling device, both the first pole portion and the third pole portion being received in an opening in the switchable magnetic flux source. ### Claim 18 (depends on 17) The magnetic coupling device of claim 17, wherein the second pole portion and the fourth pole portion are outside of an envelope of the first magnet. ### Claim 19 (depends on 17) The magnetic coupling device of claim 17, wherein the second magnet is movable relative to the first magnet. ### Claim 20 (depends on 19) The magnetic coupling device of claim 19, wherein the second magnet is rotatable relative to the first magnet. ### Claim 21 (depends on 20) The magnetic coupling device of claim 20, wherein a strength level of a magnetic field of the north pole of the magnetic coupling device is varied based on a rotational position of the second magnet relative to the first magnet. ### Claim 22 (depends on 21) The magnetic coupling device of claim 21, wherein the strength level of the magnetic field of the north pole of the magnetic coupling device is strongest when a north pole of the second magnet is aligned with a north pole of the first magnet and is weakest when the north pole of the second magnet is aligned with a south pole of the first magnet. ### Claim 23 (depends on 17) The magnetic coupling device of claim 17, further comprising at least one sensor, wherein the first pole member and the second pole member define a channel, the at least one sensor positioned in the channel. ### Claim 24 (depends on 23) The magnetic coupling device of claim 23, wherein the second magnet includes a top face and a bottom face, the bottom face facing the first magnet, the at least one sensor is positioned lower than the top face of the second magnet. ### Claim 25 (depends on 24) The magnetic coupling device of claim 24, wherein the at least one sensor is positioned lower than the bottom face of the second magnet. ### Claim 26 (depends on 19) The magnetic coupling device of claim 19, further comprising an actuator operatively coupled to the second magnet to move the second magnet relative to the first magnet. ### Claim 27 (depends on 26) The magnetic coupling device of claim 26, wherein the actuator is one of a user input having an operator actuatable portion, an electric motor, at least one conductive coil, a hydraulic system, and a pneumatic system. ### Claim 28 (depends on 17) The magnetic coupling device of claim 17, wherein the switchable magnetic flux source includes at least one electro-permanent magnet. ### Claim 29 (depends on 17) The magnetic coupling device of claim 17, wherein the second pole portion and fourth pole portion are outside of an envelope of the switchable magnetic flux source. ### Claim 30 (depends on 17) The magnetic coupling device of claim 17, wherein the switchable magnetic flux source includes at least one rare earth permanent magnet. ### Claim 31 (depends on 1) The magnetic coupling device of claim 1, wherein the switchable magnetic flux source includes a plurality of permanent magnets. ### Claim 32 (depends on 31) The magnetic coupling device of claim 31, wherein at least a first one of the plurality of permanent magnets is an electro-permanent magnet. ### Claim 33 (depends on 31) The magnetic coupling device of claim 31, wherein at least a second one of the plurality of permanent magnets is a rare earth magnet. ### Claim 34 (depends on 31) The magnetic coupling device of claim 31, wherein the plurality of permanent magnets includes a first permanent magnet and a second permanent magnet movable relative to the first permanent magnet. ### Claim 35 (depends on 34) The magnetic coupling device of claim 34, wherein the second permanent magnet is rotatable relative to the first permanent magnet. ### Claim 36 (depends on 35) The magnetic coupling device of claim 35, wherein each of the first permanent magnet and the second permanent magnet are positioned between the first north pole portion and the first south pole portion. ### Claim 37 (depends on 34) The magnetic coupling device of claim 34, wherein in the ON state of the magnetic flux source a north pole of the second permanent magnet is generally aligned with a north pole of the first permanent magnet and in the OFF state of the magnetic flux source a south pole of the second permanent magnet is generally aligned with the north pole of the first permanent magnet. ### Claim 38 (depends on 14) The magnetic coupling device of claim 14, wherein the at least one sensor includes a first magnetic field sensor positioned to monitor a first magnetic flux associated with at least one of the first workpiece engagement surface and the third workpiece engagement surface. ### Claim 39 (depends on 14) The magnetic coupling device of claim 14, further comprising a logic control circuit operatively coupled to the at least one sensor, the logic control circuit configured to determine at least one operating state of the magnetic coupling device based on an output from the at least one sensor. ### Claim 40 (depends on 39) The magnetic coupling device of claim 39, further comprising an output device which provides an indication of the operating state of the magnetic coupling device. ### Claim 41 (depends on 14) The magnetic coupling device of claim 14, further comprising a probe moveable within the channel. ### Claim 42 (depends on 41) The magnetic coupling device of claim 41, wherein the probe supports the at least one sensor. ### Claim 43 (depends on 14) The magnetic coupling device of claim 14, wherein the at least one sensor includes a proximity sensor positioned in the channel. ### Claim 44 (depends on 23) The magnetic coupling device of claim 23, wherein the at least one sensor includes a first magnetic field sensor positioned to monitor a first magnetic flux associated with at least one of the first workpiece engagement surface and the third workpiece engagement surface. ### Claim 45 (depends on 23) The magnetic coupling device of claim 23, further comprising a logic control circuit operatively coupled to the at least one sensor, the logic control circuit configured to determine at least one operating state of the magnetic coupling device based on an output from the at least one sensor. ### Claim 46 (depends on 45) The magnetic coupling device of claim 45, further comprising an output device which provides an indication of the operating state of the magnetic coupling device. ### Claim 47 (depends on 23) The magnetic coupling device of claim 23, further comprising at least one of a pin, a probe, and a tool positioned within the channel. ### Claim 48 (depends on 47) The magnetic coupling device of claim 47, wherein the probe supports the at least one sensor. ### Claim 49 (depends on 17) The magnetic coupling device of claim 17, wherein the first magnet is a permanent magnet. ### Claim 50 (depends on 17) The magnetic coupling device of claim 17, wherein each of the first magnet and the second magnet is a permanent magnet.