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US Patent 6104270 - Lifter with electropermanent magnets provided with a safety device
US Patent Issued on August 15, 2000
Estimated Patent Expiration Date:
November 30, 2018Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
November 30, 2018Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractA lifter comprising at least a reversible magnet (5, 5') arranged with its polarities oriented along a vertical axis above at least a magnet (6, 6') provided with at least a pair of permanent magnets (6a, 6a') arranged with the polarities oriented along an horizontal axis on the sides of at least a ferromagnetic core (6b, 6b') suitable to contact the load (18) to be lifted, at least a magnetic sensor (11) arranged close to the base (6c, 6c') of said ferromagnetic core, and a further magnetic sensor (12) arranged over said permanent magnets (6a, 6a') so as to measure substantially only the magnetic flux passing through the reversible magnet (5, 5'), as well as a safety device (13) for processing the signals transmitted by said magnetic sensors (11, 12) and obtaining the working point of the lifter on the magnetization curve (14) of the reversible magnet (5, 5'). | InventorAssigneeApplicationNo. 194392 filed on 11/30/1998US Classes:335/289, Electromagnet type (e.g., electromagnetic chuck)335/291Lifting or attracting type (e.g., for lifting pigiron or pulling hairpins)Field of Search335/284, For magnetizing or demagnetizing335/285, Work or object holding type335/289, Electromagnet type (e.g., electromagnetic chuck)335/290, With circuit control means335/291Lifting or attracting type (e.g., for lifting pigiron or pulling hairpins)ExaminersPrimary: Donovan, LincolnAttorney, Agent or FirmUS Patent References3978441, Permanent magnet holding systemIssued on: 08/31/1976 Inventor: Sobottka , et al.4237455, Safety device for lifting magnets Issued on: 12/02/1980 Inventor: Beckley , et al.4910633, Magnetic levitation apparatus and method Issued on: 03/20/1990 Inventor: Quinn4956625, Magnetic gripping apparatus having circuit for eliminating residual flux Issued on: 09/11/1990 Inventor: Cardone, et al.4965695, Permanent magnetic retaining device to move, affix or carry ferromagnetic parts or loads with electronic switching of the magnetic flux to release the carried load Issued on: 10/23/1990 Inventor: Baumann5642089Magnetic holder for contact sensor Issued on: 06/24/1997 Inventor: Lysen Foreign Patent References
International ClassH01F 007/20 |
