Planar Coil Patents (Class 219/675)
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Patent number: 5895599Abstract: A device for induction heating a continuously moving metal product in a protective atmosphere includes an induction system. A non-metallic and gas-tight enclosure is disposed around the moving product, between the product and the induction system. Uses include an installation for continuous heat treatment of a moving product, such as a steel strip or wire, in a protective atmosphere, between a fast cooling chamber and an intermediate temperature maintaining chamber.Type: GrantFiled: August 1, 1997Date of Patent: April 20, 1999Assignee: Selas S.A.Inventor: Claude Andre Nivoche
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Patent number: 5889263Abstract: A method and apparatus for induction sealing of a packaging material which includes a layer of aluminum foil. The apparatus includes an inductor with two parallel slightly spaced apart conductors which are disposed in an electrically insulated carrier portion. The conductors are connected to one another and to a high frequency current source by two transverse conductors. The transverse conductors are placed in the upper surface of the inductor and coincide with the outer defining lines of a flat-laid tube of packaging material.Type: GrantFiled: March 19, 1997Date of Patent: March 30, 1999Assignee: Tetra Laval Holdings & Finance S.A.Inventor: Mikael Andersson
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Patent number: 5876832Abstract: Prefabricated composite detail parts use precured strips that include Z-pin reinforcement along the bond line. Each strip has Z-pin stubble protruding from opposed faces so that the pins are embedded into the detail parts when the joint forms.Type: GrantFiled: March 7, 1997Date of Patent: March 2, 1999Inventor: Shawn D. Pannell
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Patent number: 5866884Abstract: The disclosed induction cooking range comprises, in the commonly known way, an upper plate made of glazed ceramic designed to receive a receptacle to be heated made of ferrite material, a monoconductor induction coil positioned beneath the upper plate on a coil support and excited by a high-frequency current generator. The induction coil is allowed to heat by its own losses to a temperature greater than that of the receptacle and the induction coil communicates its own heat to the receptacle. The overall efficiency of the range is thus appreciably increased. The induction coil, which must then tolerate a high temperature, is made out of a flat, monoconductor strip placed between two sheets of mica.Type: GrantFiled: May 7, 1997Date of Patent: February 2, 1999Assignee: Compagnie Europeenne Pour l'Equipement Menager - CepemInventors: Rene Cornec, Jean-Yves Gaspard, Noel Burais
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Patent number: 5818013Abstract: A device for inductive cross-field heating of flat metallic goods has at least one pair of inductors having each one iron core provided with a groove for receiving a lead that extends in the transport direction. The grooves and leads of both inductors of a pair of inductors are mirror symmetrical and the leads of each inductor form two independently switchable lead systems. Each lead system has sections that extend substantially in the transport direction of the metallic goods and whose center lines extend symmetrically to a central axis of the inductor parallel to the transport direction. The individual poles of the lead systems consist of maximum two leads. Each pole of a lead system is arranged between the poles of the other lead system. A uniform temperature distribution in the goods to be heated is achieved by synchronizing the offsetting in time the moments when both lead systems are switched.Type: GrantFiled: February 13, 1997Date of Patent: October 6, 1998Assignee: Otto Junker GmbHInventor: Dieter Schluckebier
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Patent number: 5808280Abstract: Device for induction heating of cooking receptacles, of the type comprising at least two concentric induction coils supplied by a generator. Each induction coil (I.sub.1, I.sub.2, I.sub.3) is supplied by a separate generator (G.sub.1, G.sub.2, G.sub.3), the number of induction coils being equal to the number of supply generators. A control block (8) effects the independent operation of each supply generator (G.sub.1, G.sub.2, G.sub.3). The control block (8) is adapted to cause to operate according to a sequential order the supply generators (G.sub.1, G.sub.2, G.sub.3) during a detection step of the presence of a load on the corresponding induction coil (I.sub.1, I.sub.2, I.sub.3), starting with the generator (G.sub.1) corresponding to the innermost concentric induction coil (I.sub.1) and progressing to the outermost concentric induction coil covered by the receptacle (9) to be heated. The supply generators (G.sub.1, G.sub.2, G.sub.Type: GrantFiled: December 11, 1995Date of Patent: September 15, 1998Assignee: Cidelcem IndustriesInventor: Jean-Yves Gaspard
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Patent number: 5739506Abstract: An adjustable width transverse flux heating apparatus for induction heating in the moving workpiece includes first and second elements disposed in the common plane to form an inductive coil. The first and second conductor elements define a middle spacing in an internal cross-section area of the inductive coil. A monitor detects workpiece fractures and generates signals relating thereto. A motor system moves one of the conductor elements relative to the other in response to the signal generated by the workpiece monitor.Type: GrantFiled: August 20, 1996Date of Patent: April 14, 1998Assignee: Ajax Magnethermic CorporationInventors: David J. Hanton, Nicholas V. Ross
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Patent number: 5660753Abstract: An apparatus for heating a metal surface to remove a nonferrous thermosetting resin coating bonded to the metal surface. The apparatus uses a power supply device for providing an approximately 75-100 kW signal at approximately 10-40 kHz to the apparatus. A coil assembly device is coupled to the power supply device for producing a high frequency inductive field which will penetrate through the nonferrous thermosetting resin coating with virtually no attenuation and will induce an eddy current of sufficient power in the underlying metal substrate to rapidly heat the interface to a sufficient temperature to immediately destroy the interface bond between the nonferrous thermosetting coating and the metal substrate.Type: GrantFiled: June 16, 1995Date of Patent: August 26, 1997Inventor: David Grant Lingnau
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Patent number: 5571437Abstract: A method and apparatus in which edge portions of metal parts, the edge portions being disposed with opposed surfaces, are heated by high frequency electrical currents as the edge portions are advanced and brought together at a weld point. The electrical currents are induced in the edge portions in advance of the weld point by two induction coils, one at one side of the metal parts and the other at the other side of the metal parts, disposed and energized from a high frequency electrical source so that the electrical currents at the opposed surfaces flow in opposite directions at any given time and the currents induced by one coil add to the currents induced by the other coil.Type: GrantFiled: June 5, 1995Date of Patent: November 5, 1996Assignee: Thermatool Corp.Inventor: Wallace C. Rudd
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Induction heating coil assembly and method for hardening inner surface of cylinder by using the same
Patent number: 5488219Abstract: An induction heating coil for forming a hardened layer in the inner wall of an external cylindrical member to be heated is disclosed. On the inner wall of the conductive induction member, a plurality of recess portions are formed at predetermined spaces circumferentially. The portions of the inner wall of the external cylindrical member to be heated which are opposed to the recess portions can be separately heated, in order collectively to form a plurality of separate partial hardened layers in the inner wall of the external cylindrical member to be heated circumferentially.Type: GrantFiled: November 15, 1994Date of Patent: January 30, 1996Assignee: Neturen Co., Ltd.Inventors: Yoshimasa Tanaka, Hisashi Tabuchi -
Patent number: 5403994Abstract: Transverse flux heating assembly for inductively heating a moving strip includes opposite spaced J-shaped conductors to form an inductive heating coil. The coils define a middle spacing therebetween which is unobstructed by flux guides to permit free translation movement between the conductors in a direction parallel to the strip width. The inductors provide a fully adjustable coil width to accommodate different strip widths in the heating operation.Type: GrantFiled: February 14, 1994Date of Patent: April 4, 1995Assignee: Ajax Magnethermic CorporationInventors: George Havas, Charles N. Howell, Joseph E. Quaranta
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Patent number: 5376774Abstract: Solenoid coils are provided that produce relatively low irradiation of electromagnetic fields with intense fields internally thereof for purposes of heating a metallic element, preferably a ferromagnetic element having a Curie temperature selected for the purpose for which the coil structure is to be employed, the coil structure in one embodiment comprising two coaxial coils of substantially equal diameter interconnected to produce in response to an alternating current being applied thereto out of phase magnetic fields that do not substantially interfere with one another as a result of the spacing between the coils. In a second embodiment the two coils are located between two additional coils that buck axial fields thereby together with fall off of the fields as the cube of the distance from the main coils provide a structure with low external radiation.Type: GrantFiled: January 8, 1993Date of Patent: December 27, 1994Assignee: Electric Power Research InstituteInventors: Thomas H. McGaffigan, Frank A. Doljack, Cristian C. Filimon
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Patent number: 5369249Abstract: A heating apparatus for an electromagnetic cooker and the manufacturing method has an improved electromagnetic induction characteristic and its capacity can be easily changed. The heating apparatus comprises a substrate made of an insulating material, a plurality of conductive fine lines formed in a spiral shape on the substrate and having a uniform thickness and width, and a pair of electrode terminals formed on the both ends of the plurality of fine lines, with for supplying a power source.Type: GrantFiled: August 10, 1992Date of Patent: November 29, 1994Assignee: Gold Star Co., Ltd.Inventor: Kyung A. Kwon
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Patent number: 5336868Abstract: A device for inductively heating flat metal objects, with at least one pair of induction coils which form a gap through which the object is moved. The induction coils have an iron core made up of transformer stampings with grooves in which current conductors are arranged. The iron cores of at least one inductor coil have grooves which run in a zig-zag or undulating fashion along the direction of motion of the object being heated. The maximum angle the grooves make with the direction of movement of the object is 60.degree., and the current conductors are disposed in the grooves so as to follow the zig-zags or undulations thereof. The inductor coils of at least one inductor-coil pair include several side-by-side conductors which are arranged so as to carry current in the same direction along the coil. At least some of the current conductors are arranged for selective independent electrical connection to a source of electrical energy.Type: GrantFiled: February 19, 1992Date of Patent: August 9, 1994Assignee: Otto Junker GmbHInventor: Dieter Schluckebier
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Patent number: 5334819Abstract: A water heater according to one embodiment of the invention includes a housing, a heating unit, and a pre-heating unit consisted of a transformer, a transistor, a heating coil, a rectifier that release heat for heating water when operated, the heating unit including a magnetic device and two stainless steel plates insulated from the magnetic device at two opposite sides, the stainless steel plates being heated by the magnetic force from the magnetic device to heat water passing through.Type: GrantFiled: November 8, 1993Date of Patent: August 2, 1994Inventor: Hsiao-Chih Lin
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Patent number: 5317121Abstract: An induction heating apparatus has a coil or coils which can be opened without using electrical contacts. One continuous electric current passageway is formed by a first coil section, a second coil section, a first connecting conductor and a second connecting conductor. By feeding electric power to this electric current passageway and passing an object through a space at the central portion of the coil sections, the object is induction heated. A gap is provided between the first connecting conductor and the second connecting conductor, or the respective connecting conductors can be opened and closed relative to one another to vary the size of the space therebetween. The object to be heated is carried into the space at the central portion of the coil and is carried out therefrom through the gap or the space between the conductors.Type: GrantFiled: September 21, 1992Date of Patent: May 31, 1994Assignee: Mitsubishi Jukogyo Kabushiki KaishaInventors: Keiichi Katayama, Mitsuo Kato, Kazuya Tsurusaki, Mikio Hanamoto, Kazumasa Mihara, Takatoshi Eguchi