Patents by Inventor Noriaki Sekiya

Noriaki Sekiya 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).

  • Ball screw apparatus
    Patent number: 6675669
    Abstract: A ball screw apparatus is provided with a screw shaft having a spiral ball screw groove, a nut member having a screw groove, and a plurality of balls. A smoothly continuous worked portion is formed at a portion of the screw groove by grinding a corner portion between the screw groove and a connecting way. The worked portion is formed such that the distance between the screw grooves is gradually reduced regarding an advancing direction of the ball entering from the connecting way in between the screw grooves. This worked portion extends from an end of the connecting way in a circumferential direction of the nut member and within a range of 90° from the corner portion along the circumferential direction of the nut member.
    Type: Grant
    Filed: August 17, 2001
    Date of Patent: January 13, 2004
    Assignee: NSK Ltd.
    Inventors: Noriaki Sekiya, Daisuke Maruyama, Toshiyuki Iehisa, Kazuo Miyaguchi
  • Ball screw apparatus
    Patent number: 6450055
    Abstract: A ball screw apparatus comprises a screw shaft, a nut, and a plurality of balls. A first helical groove is formed at an outer peripheral surface of the screw shaft. A second helical groove is formed at an inner peripheral surface of the nut. A rolling contact way of balls is defined by the first helical groove and the second helical groove facing each other. A connecting way formed of a tube for connecting a part and another part of the rolling contact way is provided on the nut. An endlessly communicating circuit is defined by the connecting way and the rolling contact way. Each of the balls is endlessly arranged in the circuit. A smoothly continuous machined portion is formed by cutting out an angular portion between the helical groove and the connecting way of the nut.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: September 17, 2002
    Assignee: NSK Ltd.
    Inventors: Noriaki Sekiya, Daisuke Maruyama, Toshiyuki Iehisa, Kazuo Miyaguchi
  • Ball screw apparatus
    Publication number: 20020023513
    Abstract: A ball screw apparatus is provided with a screw shaft having a spiral ball screw groove, a nut member having a screw groove, and a plurality of balls. A smoothly continuous worked portion is formed at a portion of the screw groove by grinding a corner portion between the screw groove and a connecting way. The worked portion is formed such that the distance between the screw grooves is gradually reduced regarding an advancing direction of the ball entering from the connecting way in between the screw grooves. This worked portion extends from an end of the connecting way in a circumferential direction of the nut member and within a range of 90° from the corner portion along the circumferential direction of the nut member.
    Type: Application
    Filed: August 17, 2001
    Publication date: February 28, 2002
    Applicant: NSK Ltd.
    Inventors: Noriaki Sekiya, Daisuke Maruyama, Toshiyuki Iehisa, Kazuo Miyaguchi