Planar Coil Patents (Class 219/675)
  • Patent number: 5895599
    Abstract: 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: Grant
    Filed: August 1, 1997
    Date of Patent: April 20, 1999
    Assignee: Selas S.A.
    Inventor: Claude Andre Nivoche
  • Patent number: 5889263
    Abstract: 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: Grant
    Filed: March 19, 1997
    Date of Patent: March 30, 1999
    Assignee: Tetra Laval Holdings & Finance S.A.
    Inventor: Mikael Andersson
  • Patent number: 5876832
    Abstract: 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: Grant
    Filed: March 7, 1997
    Date of Patent: March 2, 1999
    Inventor: Shawn D. Pannell
  • Patent number: 5866884
    Abstract: 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: Grant
    Filed: May 7, 1997
    Date of Patent: February 2, 1999
    Assignee: Compagnie Europeenne Pour l'Equipement Menager - Cepem
    Inventors: Rene Cornec, Jean-Yves Gaspard, Noel Burais
  • Patent number: 5818013
    Abstract: 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: Grant
    Filed: February 13, 1997
    Date of Patent: October 6, 1998
    Assignee: Otto Junker GmbH
    Inventor: Dieter Schluckebier
  • Patent number: 5808280
    Abstract: 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: Grant
    Filed: December 11, 1995
    Date of Patent: September 15, 1998
    Assignee: Cidelcem Industries
    Inventor: Jean-Yves Gaspard
  • Patent number: 5739506
    Abstract: 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: Grant
    Filed: August 20, 1996
    Date of Patent: April 14, 1998
    Assignee: Ajax Magnethermic Corporation
    Inventors: David J. Hanton, Nicholas V. Ross
  • Patent number: 5660753
    Abstract: 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: Grant
    Filed: June 16, 1995
    Date of Patent: August 26, 1997
    Inventor: David Grant Lingnau
  • Patent number: 5571437
    Abstract: 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: Grant
    Filed: June 5, 1995
    Date of Patent: November 5, 1996
    Assignee: Thermatool Corp.
    Inventor: Wallace C. Rudd
  • Patent number: 5488219
    Abstract: 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: Grant
    Filed: November 15, 1994
    Date of Patent: January 30, 1996
    Assignee: Neturen Co., Ltd.
    Inventors: Yoshimasa Tanaka, Hisashi Tabuchi
  • Patent number: 5403994
    Abstract: 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: Grant
    Filed: February 14, 1994
    Date of Patent: April 4, 1995
    Assignee: Ajax Magnethermic Corporation
    Inventors: George Havas, Charles N. Howell, Joseph E. Quaranta
  • Patent number: 5376774
    Abstract: 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: Grant
    Filed: January 8, 1993
    Date of Patent: December 27, 1994
    Assignee: Electric Power Research Institute
    Inventors: Thomas H. McGaffigan, Frank A. Doljack, Cristian C. Filimon
  • Patent number: 5369249
    Abstract: 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: Grant
    Filed: August 10, 1992
    Date of Patent: November 29, 1994
    Assignee: Gold Star Co., Ltd.
    Inventor: Kyung A. Kwon
  • Patent number: 5336868
    Abstract: 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: Grant
    Filed: February 19, 1992
    Date of Patent: August 9, 1994
    Assignee: Otto Junker GmbH
    Inventor: Dieter Schluckebier
  • Patent number: 5334819
    Abstract: 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: Grant
    Filed: November 8, 1993
    Date of Patent: August 2, 1994
    Inventor: Hsiao-Chih Lin
  • Patent number: 5317121
    Abstract: 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: Grant
    Filed: September 21, 1992
    Date of Patent: May 31, 1994
    Assignee: Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Keiichi Katayama, Mitsuo Kato, Kazuya Tsurusaki, Mikio Hanamoto, Kazumasa Mihara, Takatoshi Eguchi