Patents by Inventor Yutaka Kiyosawa

Yutaka Kiyosawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10582575
    Abstract: A heating coil includes a pair of linear lead portions adapted to be connected to a power supply, and a ring-shaped or coil-shaped head portion having end portions connected to the lead portions respectively. A flow path through which a cooling medium flows is formed inside the lead portions and the head portion. An outer circumferential surface of the head portion has a circular or elliptical cross section and is configured to face a heating target portion of an inner circumferential surface of a work extending, the heating target portion extending in a circumferential direction of the work. Each of the lead portions has a straight side portion in a plane intersecting a longitudinal direction of the lead portions, the straight side portions of the lead portions being arranged in proximity to each other.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: March 3, 2020
    Assignee: NETUREN CO., LTD.
    Inventors: Yutaka Kiyosawa, Yutaka Sugiyama, Yasuharu Ogawa
  • Patent number: 10462854
    Abstract: Heating coils are opposed to a portion of an annular workpiece having a continuously provided recessed surface, and the heating coils and the annular workpiece are moved relative to each other to heat the recessed surface by induction heating. The heating apparatus includes a first heating coil having a first corner conductor portion to be opposed to a first corner portion of the recessed surface and a first bottom conductor portion connected to the first corner conductor portion to be opposed to the bottom portion, and a second heating coil having a second corner conductor portion to be opposed to a second corner portion of the recessed surface and a second bottom conductor portion connected to the second corner conductor portion to be opposed to the bottom portion.
    Type: Grant
    Filed: April 8, 2015
    Date of Patent: October 29, 2019
    Assignee: NETUREN CO., LTD.
    Inventors: Yutaka Kiyosawa, Shigeo Takahashi, Yasuharu Ogawa
  • Patent number: 10415109
    Abstract: A workpiece for an induction hardening is provided. The workpiece has a first inclined surface, a second inclined surface, and a connecting surface connecting the first inclined surface and the second inclined surface on a side toward which the first inclined surface and the second inclined surface approach each other. The connecting surface has a recessed portion. A hardened layer formed at the first inclined surface and another hardened layer formed at the second inclined surface do not overlap each other at the recessed portion.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: September 17, 2019
    Assignee: NETUREN CO., LTD.
    Inventor: Yutaka Kiyosawa
  • Patent number: 10314118
    Abstract: To heat a workpiece having a recess portion provided along a longitudinal axis of the workpiece, the workpiece is inserted into an induction heating coil, and the induction heating coil or the workpiece is along an axial direction of the workpiece. The induction heating coil has a conductor configured to surround the workpiece around the axis of the workpiece. The conductor has a protruding portion protruding inwardly to face the recess portion of the workpiece.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: June 4, 2019
    Assignee: NETUREN CO., LTD.
    Inventors: Hirokazu Inaba, Yutaka Kiyosawa
  • Publication number: 20190021140
    Abstract: An induction heating system includes induction heating apparatuses, each including a high-frequency current transformer, a low-frequency current transformer and a heating coil, a high-frequency input switch connected to the high-frequency current transformer, a low-frequency input switch connected to the low-frequency current transformer, a first power source to output a high-frequency electric power and a low frequency electric power, a second power source, a first power source output switch connectable to the first power source, a second power source output switch connectable to the second power source, and a switch controller. Each induction heating apparatus includes a heater controller to send a signal to the switching controller to turn on one of the first power source output switch and the second power source output switch, to turn off the other, and to switch on or off each of the high-frequency input switch and the low-frequency input switch.
    Type: Application
    Filed: September 17, 2018
    Publication date: January 17, 2019
    Inventors: Tetsuya ONO, Masato SUGIMOTO, Yutaka KIYOSAWA, Toshihiro AIBA, Kazutomi OKA, Kunihiro KOBAYASHI, Fumiaki IKUTA, Kazuhiro KAWASAKI
  • Patent number: 10159117
    Abstract: An induction heating system includes induction heating apparatuses, each including a high-frequency current transformer, a low-frequency current transformer and a heating coil, a high-frequency input switch connected to the high-frequency current transformer, a low-frequency input switch connected to the low-frequency current transformer, a first power source to output a high-frequency electric power and a low frequency electric power, a second power source, a first power source output switch connectable to the first power source, a second power source output switch connectable to the second power source, and a switch controller. Each induction heating apparatus includes a heater controller to send a signal to the switching controller to turn on one of the first power source output switch and the second power source output switch, to turn off the other, and to switch on or off each of the high-frequency input switch and the low-frequency input switch.
    Type: Grant
    Filed: May 17, 2013
    Date of Patent: December 18, 2018
    Assignee: NETUREN CO., LTD.
    Inventors: Tetsuya Ono, Masato Sugimoto, Yutaka Kiyosawa, Toshihiro Aiba, Kazutomi Oka, Fumiaki Ikuta, Kazuhiro Kawasaki
  • Publication number: 20170041988
    Abstract: Heating coils are opposed to a portion of an annular workpiece having a continuously provided recessed surface, and the heating coils and the annular workpiece are moved relative to each other to heat the recessed surface by induction heating. The heating apparatus includes a first heating coil having a first corner conductor portion to be opposed to a first corner portion of the recessed surface and a first bottom conductor portion connected to the first corner conductor portion to be opposed to the bottom portion, and a second heating coil having a second corner conductor portion to be opposed to a second corner portion of the recessed surface and a second bottom conductor portion connected to the second corner conductor portion to be opposed to the bottom portion.
    Type: Application
    Filed: April 8, 2015
    Publication date: February 9, 2017
    Inventors: Yutaka KIYOSAWA, Shigeo TAKAHASHI, Yasuharu OGAWA
  • Publication number: 20170029910
    Abstract: A workpiece for an induction hardening is provided. The workpiece has a first inclined surface, a second inclined surface, and a connecting surface connecting the first inclined surface and the second inclined surface on a side toward which the first inclined surface and the second inclined surface approach each other. The connecting surface has a recessed portion. A hardened layer formed at the first inclined surface and another hardened layer formed at the second inclined surface do not overlap each other at the recessed portion.
    Type: Application
    Filed: March 31, 2015
    Publication date: February 2, 2017
    Inventor: Yutaka KIYOSAWA
  • Publication number: 20160316523
    Abstract: To heat a workpiece having a recess portion provided along a longitudinal axis of the workpiece, the workpiece is inserted into an induction heating coil, and the induction heating coil or the workpiece is along an axial direction of the workpiece. The induction heating coil has a conductor configured to surround the workpiece around the axis of the workpiece. The conductor has a protruding portion protruding inwardly to face the recess portion of the workpiece.
    Type: Application
    Filed: December 17, 2014
    Publication date: October 27, 2016
    Applicant: NETUREN CO., LTD.
    Inventors: Hirokazu INABA, Yutaka KIYOSAWA
  • Publication number: 20150237680
    Abstract: An induction heating system includes induction heating apparatuses, each including a high-frequency current transformer, a low-frequency current transformer and a heating coil, a high-frequency input switch connected to the high-frequency current transformer, a low-frequency input switch connected to the low-frequency current transformer, a first power source to output a high-frequency electric power and a low frequency electric power, a second power source, a first power source output switch connectable to the first power source, a second power source output switch connectable to the second power source, and a switch controller. Each induction heating apparatus includes a heater controller to send a signal to the switching controller to turn on one of the first power source output switch and the second power source output switch, to turn off the other, and to switch on or off each of the high-frequency input switch and the low-frequency input switch.
    Type: Application
    Filed: May 17, 2013
    Publication date: August 20, 2015
    Inventors: Tetsuya Ono, Masato Sugimoto, Yutaka Kiyosawa, Toshihiro Aiba, Kazutomi Oka, Kunihiro Kobayashi, Fumiaki Ikuta, Kazuhiro Kawasaki
  • Patent number: 8595936
    Abstract: The one end side portion is nipped by a jig including a jig member having a pair of convex portions which are to be fitted to a depressions in contact with a tooth side face and a inclined portion and positioning a bar and a jig member which is to be clamped/opened with respect to the jig member. A die having an inside diameter smaller than the diameter of the outer periphery is pressed onto the outer periphery of the end portion of the cylindrical end side portion projected from the jig up to a press-in depth determined preliminarily based on the rack, so as to reduce the diameter of the end portion.
    Type: Grant
    Filed: January 10, 2012
    Date of Patent: December 3, 2013
    Assignee: Neturen Co., Ltd.
    Inventors: Takashi Yamawaki, Ryosuke Suzuki, Tetsuji Murata, Tsuyoshi Yamamoto, Yutaka Kiyosawa
  • Patent number: 8499660
    Abstract: The one end side portion is nipped by a jig including a jig member having a pair of convex portions which are to be fitted to a depressions in contact with a tooth side face and a inclined portion and positioning a bar and a jig member which is to be clamped/opened with respect to the jig member. A die having an inside diameter smaller than the diameter of the outer periphery is pressed onto the outer periphery of the end portion of the cylindrical end side portion projected from the jig up to a press-in depth determined preliminarily based on the rack, so as to reduce the diameter of the end portion.
    Type: Grant
    Filed: January 10, 2012
    Date of Patent: August 6, 2013
    Assignee: Neturen Co., Ltd.
    Inventors: Takashi Yamawaki, Ryosuke Suzuki, Tetsuji Murata, Tsuyoshi Yamamoto, Yutaka Kiyosawa
  • Publication number: 20120103120
    Abstract: The one end side portion is nipped by a jig including a jig member having a pair of convex portions which are to be fitted to a depressions in contact with a tooth side face and a inclined portion and positioning a bar and a jig member which is to be clamped/opened with respect to the jig member. A die having an inside diameter smaller than the diameter of the outer periphery is pressed onto the outer periphery of the end portion of the cylindrical end side portion projected from the jig up to a press-in depth determined preliminarily based on the rack, so as to reduce the diameter of the end portion.
    Type: Application
    Filed: January 10, 2012
    Publication date: May 3, 2012
    Applicant: NETUREN CO., LTD.
    Inventors: Takashi Yamawaki, Ryosuke Suzuki, Tetsuji Murata, Tsuyoshi Yamamoto, Yutaka Kiyosawa
  • Publication number: 20120102739
    Abstract: The one end side portion is nipped by a jig including a jig member having a pair of convex portions which are to be fitted to a depressions in contact with a tooth side face and a inclined portion and positioning a bar and a jig member which is to be clamped/opened with respect to the jig member. A die having an inside diameter smaller than the diameter of the outer periphery is pressed onto the outer periphery of the end portion of the cylindrical end side portion projected from the jig up to a press-in depth determined preliminarily based on the rack, so as to reduce the diameter of the end portion.
    Type: Application
    Filed: January 10, 2012
    Publication date: May 3, 2012
    Applicant: NETUREN CO., LTD.
    Inventors: Takashi Yamawaki, Ryosuke Suzuki, Tetsuji Murata, Tsuyoshi Yamamoto, Yutaka Kiyosawa
  • Patent number: 8104369
    Abstract: The one end side portion is nipped by a jig including a jig member having a pair of convex portions which are to be fitted to a depressions in contact with a tooth side face and a inclined portion and positioning a bar and a jig member which is to be clamped/opened with respect to the jig member. A die having an inside diameter smaller than the diameter of the outer periphery is pressed onto the outer periphery of the end portion of the cylindrical end side portion projected from the jig up to a press-in depth determined preliminarily based on the rack, so as to reduce the diameter of the end portion.
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: January 31, 2012
    Assignee: Neturen Co., Ltd.
    Inventors: Takashi Yamawaki, Ryosuke Suzuki, Tetsuji Murata, Tsuyoshi Yamamoto, Yutaka Kiyosawa
  • Patent number: 7442906
    Abstract: In an induction heating coil for heating a shaft member having multiple steps, annular conductors are separately disposed in the axis direction, the annular conductors having inner diameters so as to form predetermined gaps with outer peripheries of heating portions of the shaft member, the lengths of annular conductors (1, 2, and 3) are set so that the areas of the respective heating portions are approximately equal to each other, and the annular conductors are connected to each other in series, so that the respective step shaft portions of the shaft member are uniformly heated. The annular conductors described above may be formed to have shapes in conformity with the shapes of the heating portions of the shaft member and may be formed to have a step shape corresponding to steps of the shaft member having different outer diameters.
    Type: Grant
    Filed: April 8, 2005
    Date of Patent: October 28, 2008
    Assignee: Neturen Co., Ltd.
    Inventors: Yoshimasa Tanaka, Takeshi Endoh, Yutaka Kiyosawa, Fumiaki Ikuta, Takashi Horino, Masayuki Komatsu, Jun Fujie, Takeshi Yoshikawa
  • Publication number: 20080229856
    Abstract: The one end side portion is nipped by a jig including a jig member having a pair of convex portions which are to be fitted to a depressions in contact with a tooth side face and a inclined portion and positioning a bar and a jig member which is to be clamped/opened with respect to the jig member. A die having an inside diameter smaller than the diameter of the outer periphery is pressed onto the outer periphery of the end portion of the cylindrical end side portion projected from the jig up to a press-in depth determined preliminarily based on the rack, so as to reduce the diameter of the end portion.
    Type: Application
    Filed: March 20, 2008
    Publication date: September 25, 2008
    Applicant: NETUREN Co., Ltd. (a Japanese corporation)
    Inventors: Takashi Yamawaki, Ryosuke Suzuki, Tetsuji Murata, Tsuyoshi Yamamoto, Yutaka Kiyosawa
  • Publication number: 20070000916
    Abstract: In an induction heating coil for heating a shaft member having multiple steps, annular conductors are separately disposed in the axis direction, the annular conductors having inner diameters so as to form predetermined gaps with outer peripheries of heating portions of the shaft member, the lengths of annular conductors 1, 2, and 3 are set so that the areas of the respective heating portions are approximately equal to each other, and the annular conductors are connected to each other in series, so that the respective step shaft portions of the shaft member are uniformly heated. The annular conductors described above may be formed to have shapes in conformity with the shapes of the heating portions of the shaft member and may be formed to have a step shape corresponding to steps of the shaft member having different outer diameters.
    Type: Application
    Filed: April 8, 2005
    Publication date: January 4, 2007
    Applicant: NETUREN CO., LTD.
    Inventors: Yoshimasa Tanaka, Takeshi Endoh, Yutaka Kiyosawa, Fumiaki Ikuta, Takashi Horino, Masayuki Komatsu, Jun Fujie, Takeshi Yoshikawa