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
Patent 4965695 Issued on October 23, 1990. Estimated Expiration Date: 
May 20, 2008. Estimated 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.
May 20, 2008. Estimated 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.Patent References 1335119 3316514 3389356 3798581 Hook device Permanent magnet field diverted to do useful work Chuck control for a workpiece holding electromagnet Patent #: 4633361 InventorApplicationNo. 197046 filed on 05/20/1988US Classes:361/142, Including housing294/65.5, MAGNET294/907, SENSOR CONTROLLED DEVICE335/290, With circuit control means335/291, Lifting or attracting type (e.g., for lifting pigiron or pulling hairpins)335/294, With outer casing or housing340/666, Weight361/144, For lifting or holding361/147With permanent magnetExaminersPrimary: Pellinen, A. D.Assistant: Osborn, David Attorney, Agent or FirmInternational ClassH01F 007/04Foreign Application Priority Data1987-05-22 BRAbstractPermanent magnetic retaining device to move, affix or carry ferromagnetic parts or load with electronic switching of the magnetic flux to release the carried load includes a central iron core enclosed by a pair of magnet blocks secured by iron shoes, laterally joined to reinforcing plates and terminated by lateral poles with one or more compensator coils being disposed on the central core, with a sliding cover above the former, moving on a pair of guide pins surrounded by mechanical force gauges, the cover being centrally provided with a lifter eyelet. An electronic control circuit is incorporated externally in one of the side walls of a rectangular enveloping overcover wherein, at the opposite side thereof, a sensor of the electronic circuit is incorporated, to be operated manually and/or by remote control.Field of SearchCONTROL CIRCUITS FOR ELECTROMAGNETIC DEVICESIncluding housing Systems for magnetizing, demagnetizing, or controlling the magnetic field For lifting or holding Magnetic chuck-type With permanent magnet Including particular drive circuit Including instrument (e.g., meter-relay) Including means for using, or compensating for, the induced EMF of the electromagnetic device Electromagnet type (e.g., electromagnetic chuck) With circuit control means Lifting or attracting type (e.g., for lifting pigiron or pulling hairpins) With magnetic-hold control means (e.g., means to control the hold strength) Hermetically sealed or moisture-proofed With outer casing or housing Permanent magnets Weight Cranes Transmitter for remote control signal Mechanical force | |
