Patents by Inventor Kazuhito Nishiyama

Kazuhito Nishiyama 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: 9528553
    Abstract: An oil passage obstruction wall member (W) is configured to obstruct an oil passage having plural pathways configured to communicate plural oil supply openings (6) at plural locations on an outer circumference of an end cap (1) included in a linear guide device arranged such that a bottom face of a guide rail is arranged on a face slanted at an angle ranging from 0 degrees to 180 degrees with respect to a plane face, with a direction change passage (4) configured to communicate a rolling element rolling passage formed between the guide rail and the slider body with a rolling element return passage included in the slider body. The oil passage obstruction wall member (W) is selectively opened depending on the angle of the face on which the bottom face of the guide rail is arranged to selectively communicate the direction change passage (4) and the oil supply openings (6).
    Type: Grant
    Filed: August 26, 2013
    Date of Patent: December 27, 2016
    Assignee: NSK Ltd.
    Inventors: Kazuhito Nishiyama, Takumi Nakagawa
  • Publication number: 20150219160
    Abstract: An oil passage obstruction wall member (W) is configured to obstruct an oil passage having plural pathways configured to communicate plural oil supply openings (6) at plural locations on an outer circumference of an end cap (1) included in a linear guide device arranged such that a bottom face of a guide rail is arranged on a face slanted at an angle ranging from 0 degrees to 180 degrees with respect to a plane face, with a direction change passage (4) configured to communicate a rolling element rolling passage formed between the guide rail and the slider body with a rolling element return passage included in the slider body. The oil passage obstruction wall member (W) is selectively opened depending on the angle of the face on which the bottom face of the guide rail is arranged to selectively communicate the direction change passage (4) and the oil supply openings (6).
    Type: Application
    Filed: August 26, 2013
    Publication date: August 6, 2015
    Inventors: Kazuhito Nishiyama, Takumi Nakagawa
  • Patent number: 8961016
    Abstract: A linear guide apparatus is provided in which an excellent sealing performance is achieved. The linear guide apparatus includes a retainer for retaining plural cylindrical rollers rotatably in a rolling element rolling passage. The retainer includes an opening portion and accommodates for retention of the plural cylindrical rollers in the opening portion. The retainer also includes an endless seal unit surrounding the opening portion. The seal unit includes an inward facing lip inclining toward the inner side of the opening portion and extending toward the guide rail to be in sliding contact with the guide rail. The inward facing lip is formed continuously all around the seal unit. The seal unit includes an outward facing lip inclining toward the outer side of the opening portion and extending toward the guide rail to be in sliding contact with the guide rail, in addition to the inward facing lip.
    Type: Grant
    Filed: August 22, 2012
    Date of Patent: February 24, 2015
    Assignee: NSK Ltd.
    Inventors: Takumi Nakagawa, Jun Matsumoto, Kazuhito Nishiyama, Keisuke Tanaka
  • Patent number: 8894283
    Abstract: A linear guide device includes a guide rail, a slider, and a side seal member attached to an axial direction end part of the slider. The side seal member is formed integrally and has a flat surface facing the guide rail. A clearance between the side seal member and the guide rail is kept the same on a whole of the side seal member, and a thickness in the axial direction of the side seal member is 25 to 140 times the clearance.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: November 25, 2014
    Assignee: NSK Ltd.
    Inventor: Kazuhito Nishiyama
  • Publication number: 20140219587
    Abstract: A linear guide apparatus is provided in which an excellent sealing performance is achieved. The linear guide apparatus includes a retainer for retaining plural cylindrical rollers rotatably in a rolling element rolling passage. The retainer includes an opening portion and accommodates for retention of the plural cylindrical rollers in the opening portion. The retainer also includes an endless seal unit surrounding the opening portion. The seal unit includes an inward facing lip inclining toward the inner side of the opening portion and extending toward the guide rail to be in sliding contact with the guide rail. The inward facing lip is formed continuously all around the seal unit. The seal unit includes an outward facing lip inclining toward the outer side of the opening portion and extending toward the guide rail to be in sliding contact with the guide rail, in addition to the inward facing lip.
    Type: Application
    Filed: August 22, 2012
    Publication date: August 7, 2014
    Applicant: NSK Ltd.
    Inventors: Takumi Nakagawa, Jun Matsumoto, Kazuhito Nishiyama, Keisuke Tanaka
  • Patent number: 8790011
    Abstract: A non-contact seal device is provided such that when attaching an end seal to a slider, positioning members can be used for positioning in the vertical and horizontal directions. Due to this, the end seal can be positioned with respect to the outer surfaces of the guide rail without using a specialized positioning fixture and then attach the end seal to the slider. Further, the projecting length of the positioning members is the same as the distance of the clearance between the guide rail and the end seal. Due to this, it becomes possible to attach the end seal to the slider so that the clearance between the guide rail and the end seal becomes the same as the distance of the clearance without using a specialized positioning fixture.
    Type: Grant
    Filed: September 14, 2011
    Date of Patent: July 29, 2014
    Assignee: NSK, Ltd.
    Inventor: Kazuhito Nishiyama
  • Publication number: 20130343680
    Abstract: There is provided a linear guide device which enables easy management of the amount of clearance between a side seal member and guide rail, which can reduce the amount of fine particles which escape to the outside of the side seal member. Such a linear guide device is suitable for being used in a clean room environment. The linear guide device is provided with a side seal member attached to an axial direction end part of a slider while providing a predetermined amount of clearance with a guide rail. The side seal member is formed integrally and has a thickness in the axial direction of 25 to 140 times the amount of clearance.
    Type: Application
    Filed: September 13, 2011
    Publication date: December 26, 2013
    Applicant: NSK Ltd.
    Inventor: Kazuhito Nishiyama
  • Publication number: 20130223770
    Abstract: A non-contact seal device is provided such that when attaching an end seal to a slider, positioning members can be used for positioning in the vertical and horizontal directions. Due to this, the end seal can be positioned with respect to the outer surfaces of the guide rail without using a specialized positioning fixture and then attach the end seal to the slider. Further, the projecting length of the positioning members is the same as the distance of the clearance between the guide rail and the end seal. Due to this, it becomes possible to attach the end seal to the slider so that the clearance between the guide rail and the end seal becomes the same as the distance of the clearance without using a specialized positioning fixture.
    Type: Application
    Filed: September 14, 2011
    Publication date: August 29, 2013
    Inventor: Kazuhito Nishiyama