Patents Assigned to Kabushiki Kaisha Takezawa Seiki
  • Patent number: 6551178
    Abstract: A reamer with adjustable expansion/contraction and a bore finishing machine comprising the reamer. The reamer has a rotation shaft that is externally operable and a grinding section. The grinding section is cylindrically shaped, and has a plurality of axially-extending slits in its peripheral wall and a tapered inner surface. The rotation shaft is connected via threaded sections to a sliding shaft, which is in turn connected to a diameter expansion member consisting of a tapered cone fitted into the tapered inner surface of the grinding section. When the rotation shaft is operated to rotate, the rotational motion is converted into linear motion of the slide shaft due to a guide pin and a guide hole. The linear motion moves the diameter expansion member back and forth inside the grinding section, thereby contracting/expanding the outer diameter of the grinding section mechanically and precisely. The bore finishing machine has a hollow main rotation spindle, and a rotation spindle inside the same.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: April 22, 2003
    Assignees: Kabushiki Kaisha Takezawa Seiki, Kuraki Co., Ltd.
    Inventors: Junichi Tanaka, Toshiyuki Nomoto, Eiji Takezawa
  • Patent number: 6203410
    Abstract: A reamer with adjustable expansion/contraction and a bore finishing machine comprising the reamer. The reamer has a rotation shaft that is externally operable and a grinding section. The grinding section is cylindrically shaped, and has a plurality of axially-extending slits in its peripheral wall and a tapered inner surface. The rotation shaft is connected via threaded sections to a sliding shaft, which is in turn connected to a diameter expansion member consisting of a tapered cone fitted into the tapered inner surface of the grinding section. When the rotation shaft is operated to rotate, the rotational motion is converted into linear motion of the slide shaft due to a guide pin and a guide hole. The linear motion moves the diameter expansion member back and forth inside the grinding section, thereby contracting/expanding the outer diameter of the grinding section mechanically and precisely. The bore finishing machine has a hollow main rotation spindle, and a rotation spindle inside the same.
    Type: Grant
    Filed: September 13, 1999
    Date of Patent: March 20, 2001
    Assignees: Kabushiki Kaisha Takezawa Seiki, Kuraki Co., Ltd.
    Inventors: Junichi Tanaka, Toshiyuki Nomoto, Eiji Takezawa