Patents by Inventor Shigemasa Hakakoshi

Shigemasa Hakakoshi 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: 7749428
    Abstract: A manufacturing method of a clad material composed of a bronze alloy and a steel is provided, including: scattering a bronze alloy powder on a steel back metal; sintering the bronze alloy powder to obtain a bilayer material having a porous bronze alloy layer on the steel; dry-rolling and a sintering the bilayer material so that the bronze alloy layer has a porosity of 3% or less; and wet-rolling the bilayer material with supplying a rolling oil to surfaces of rolling rolls. The clad manufactured according to this method can be heat-treated without an disadvantage in a conventional wet-rolling that entering rolling oil vaporizes in the bronze alloy layer during the heat treatment to form new voids. Therefore, it becomes possible to make a bronze alloy layer high in density in small times of rolling, thus enabling an increase in production efficiency.
    Type: Grant
    Filed: March 27, 2007
    Date of Patent: July 6, 2010
    Assignee: Daido Metal Co Ltd.
    Inventors: Hiroyuki Sugawara, Yasuo Ido, Yoshiaki Sato, Yukio Ogita, Shigemasa Hakakoshi
  • Publication number: 20070224074
    Abstract: A manufacturing method of a clad material composed of a bronze alloy and a steel is provided, including: scattering a bronze alloy powder on a steel back metal; sintering the bronze alloy powder to obtain a bilayer material having a porous bronze alloy layer on the steel; dry-rolling and a sintering the bilayer material so that the bronze alloy layer has a porosity of 3% or less; and wet-rolling the bilayer material with supplying a rolling oil to surfaces of rolling rolls. The clad manufactured according to this method can be heat-treated without an disadvantage in a conventional wet-rolling that entering rolling oil vaporizes in the bronze alloy layer during the heat treatment to form new voids. Therefore, it becomes possible to make a bronze alloy layer high in density in small times of rolling, thus enabling an increase in production efficiency.
    Type: Application
    Filed: March 27, 2007
    Publication date: September 27, 2007
    Applicant: Daido Metal Company Ltd.
    Inventors: Hiroyuki Sugawara, Yasuo Ido, Yoshiaki Sato, Yukio Ogita, Shigemasa Hakakoshi
  • Patent number: 5447774
    Abstract: There is disclosed a composite slide member which suppresses the exposure of a porous metal layer even when the amount of cutting from a surface of the slide member increases, thereby enhancing an anti-seizing property without adversely affecting a rear resistance. The composite slide member includes a back plate, and a slide layer including a porous metal layer with a porosity of 50% to 80% and a composite synthetic resin composition impregnated and coated in pores of the porous metal layer. The porous metal layer is joined to a surface of the back plate. The porous metal layer is formed by sintering metal powder without applying pressure thereto, and an apparent density of the metal powder is 20% to 40% of its theoretical density. The porous metal and the composite synthetic resin are dispersed on a sliding surface of the slide layer in a substantially mixed condition.
    Type: Grant
    Filed: January 13, 1993
    Date of Patent: September 5, 1995
    Assignee: Daido Metal Company, Ltd.
    Inventors: Tadashi Tanaka, Hidehiko Tamura, Shigemasa Hakakoshi, Takahiro Niwa
  • Patent number: 5162157
    Abstract: Disclosed are a sliding material comprising a backing metal having a porous metal layer formed on the surface thereof in which pores are defined and a composition for impregnation coating impregnated and coated to the pores and the surface thereof, wherein the composition for impregnation coating is a composition composed of (a) 5-30 vol % of metal lead having a relative surface area of 1,000-8,500 cm.sup.2 /g in an average particle size, and the remaining portion substantially composed of PTFE, a sliding material comprising a backing metal having porous metal layer formed on the surface thereof in which pores are defined and a composition for impregnation coating impregnated and coated to the pores and the surface thereof, wherein the composition for impregnation coating is a composition composed of (b) 5-30 vol % of metal lead having a relative surface area of 1,000-8,500 cm.sup.2 /g in an average particle size, 0.
    Type: Grant
    Filed: February 26, 1991
    Date of Patent: November 10, 1992
    Assignee: Daido Metal Company Ltd.
    Inventors: Tadashi Tanaka, Hidehiko Tamura, Kiyohide Uenaka, Shigemasa Hakakoshi
  • Patent number: 5091098
    Abstract: A sliding material comprising a backing metal having a porous metal layer formed on the surface thereof and a composition for impregnation coating impregnated and coated to the pores and the surface thereof, wherein the composition for impregnation coating is a composition composed of (a) 0.5-30 vol. % of at least one material selected from a group of resins composed of PFA, EPE, and FEP, 5-30 vol % of metal lead having a relative surface area of 1,000-8,500 cm.sup.2 /g in an average particle size, and the balance composed of PTFE, a total of the respective components other than the PTFE is 5.5-50 vol %, a sliding material comprising a backing metal having porous metal layer formed on the surface thereof and a composition for impregnation coating impregnated and coated to the pores and the surface thereof composed of 0.5-30 vol % of at least one material selected from resins composed of PFA, EPE, and FEP, 5-30 vol % of metal lead having a relative surface area of 1,000-8,500 cm.sup.
    Type: Grant
    Filed: February 26, 1991
    Date of Patent: February 25, 1992
    Assignee: Daido Metal Company Ltd.
    Inventors: Tadashi Tanaka, Hidehiko Tamura, Kiyohide Uenaka, Shigemasa Hakakoshi