Patents by Inventor Yoshiyasu Nishikawa

Yoshiyasu Nishikawa 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).

  • Diagonal-flow fan wheel with blades of developable surface shape
    Patent number: 4401410
    Abstract: A blade of the fan wheel of a diagonal-flow fan, which blade should ideally have a shape of a twisted double-curvature or undevelopable surface, is formed from a portion of a combination of a cylindrical plate and a planar plate tangent to the cylindrical plate or of a combination of a pair of mutually circumscribing cylindrical surfaces, which portion constitutes a developable surface. To realize the formation of a blade from the developable surface, lines of intersection between combined cylinder and planar plates or combined cylinders and a number of coaxial imaginary conical surfaces representing streamlines in the fan wheel are used as a basis for design.
    Type: Grant
    Filed: December 8, 1980
    Date of Patent: August 30, 1983
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha
    Inventor: Yoshiyasu Nishikawa
  • Single curvature fan wheel of a diagonal flow fan
    Patent number: 4362468
    Abstract: A blade of the fan wheel of a diagonal-flow fan, which blade should ideally have a shape of a twisted double-curvature or undevelopable surface, is formed from a portion of a cylinder, which has a single-curvature or developable surface. To realize the formation of a blade from the single-curvature surface, lines of intersection between a cylinder and a number of coaxial imaginary conical surfaces representing streamlines in the fan wheel are used as a basis for design.
    Type: Grant
    Filed: June 20, 1980
    Date of Patent: December 7, 1982
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha
    Inventors: Yoshiyasu Nishikawa, Chosei Harada, Masao Nakano
  • Single curvature fan wheel of a diagonal flow fan
    Patent number: 4358244
    Abstract: A blade of the fan wheel of a diagonal-flow fan, which blade should ideally have a shape of a twisted double curvature or undevelopable surface, is formed from a portion of a cylinder, which has a single-curvature or developable surface. To realize the formation of a blade from the single-curvature surface, lines of intersection between a cylinder and a number of coaxial imaginary conical surfaces representing streamlines in the fan wheel are used as a basis for design.
    Type: Grant
    Filed: June 20, 1980
    Date of Patent: November 9, 1982
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha
    Inventors: Yoshiyasu Nishikawa, Chosei Harada, Masao Nakano
  • Diagonal-flow fan wheel with blades of developable surface shape
    Patent number: 4274810
    Abstract: A blade of the fan wheel of a diagonal-flow fan, which blade should ideally have a shape of a twisted double-curvature or undevelopable surface, is formed from a portion of a combination of a cylindrical plate and a planar plate tangent to the cylindrical plate or of a combination of a pair of mutually circumscribing cylindrical surfaces, which portion constitutes a developable surface. To realize the formation of a blade from the developable surface, lines of intersection between combined cylinder and planar plates or combined cylinders and a number of coaxial imaginary conical surfaces representing streamlines in the fan wheel are used as a basis for design.
    Type: Grant
    Filed: June 23, 1978
    Date of Patent: June 23, 1981
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha
    Inventor: Yoshiyasu Nishikawa
  • Single-curvature fan wheel of diagonal-flow fan
    Patent number: 4227868
    Abstract: A blade of the fan wheel of a diagonal-flow fan, which blade should ideally have a shape of a twisted double-curvature or undevelopable surface, is formed from a portion of a cylinder, which has a single-curvature or developable surface. To realize the formation of a blade from the single-curvature surface, lines of intersection between a cylinder and a number of coaxial imaginary conical surfaces representing streamlines in the fan wheel are used as a basis for design.
    Type: Grant
    Filed: January 25, 1978
    Date of Patent: October 14, 1980
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha
    Inventors: Yoshiyasu Nishikawa, Chosei Harada, Masao Nakano
  • Flat-bladed fan wheel of diagonal-flow fan
    Patent number: 4218190
    Abstract: A blade in the fan wheel of a diagonal-flow fan, which blade should ideally have the contoured shape of a twisted double-curvature or undevelopable surface, is formed from a portion of a plate which has a flat planar surface. To develope the flat blade shape from a planar surface, lines of intersection between a plate and the streamsurfaces in the ideal fan wheel, which are represented by a number of coaxial imaginary conical surfaces, are used as a basis for design. The realized flat blade can then be orientated between the frustoconical main and side plates to form a diagonal-flow path similar in performance to the ideal blade of a twisted double-curvature surface.
    Type: Grant
    Filed: April 26, 1978
    Date of Patent: August 19, 1980
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha
    Inventors: Yoshiyasu Nishikawa, Masao Nakano