Patents by Inventor Eiji Amada

Eiji Amada 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).

  • Publication number: 20180087137
    Abstract: A steel constituting a chisel according to the present invention includes: 0.40-0.45% by mass of carbon, 0.50-0.80% by mass of silicon, 1.00-1.30% by mass of manganese, 0.001-0.005% by mass of sulfur, 2.90-3.80% by mass of chromium, and 0.20-0.40% by mass of molybdenum, with a balance consisting of iron and an unavoidable impurity, the steel has an ideal critical diameter DI defined by Equation (1) of 600 or more: DI=7·(% C)1/2·(1+0.64·% Si)·(1+4.1·% Mn)·(1+2.83·% P)·(1?0.62·% S)·(1+2.33·% Cr)·(1+3.14·% Mo)??(1).
    Type: Application
    Filed: March 9, 2016
    Publication date: March 29, 2018
    Applicant: KOMATSU LTD.
    Inventors: Eiji AMADA, Akihiro OCHIAI, Norimasa TSUNEKAGE, Yuko NAGAKI
  • Patent number: 9790578
    Abstract: A steel for a tracked undercarriage component is used as a material constituting a track link (9), for example, and contains: not less than 0.39% by mass and not more than 0.45% by mass of carbon, not less than 0.2% by mass and not more than 1.0% by mass of silicon, not less than 0.10% by mass and not more than 0.90% by mass of manganese, not less than 0.002% by mass and not more than 0.005% by mass of sulfur, not less than 0.1% by mass and not more than 3.0% by mass of nickel, not less than 0.70% by mass and not more than 1.50% by mass of chromium, and not less than 0.10% by mass and not more than 0.60% by mass of molybdenum, with the balance made of iron and unavoidable impurities.
    Type: Grant
    Filed: May 8, 2014
    Date of Patent: October 17, 2017
    Assignee: KOMATSU LTD.
    Inventors: Eiji Amada, Kazuo Maeda, Takeji Kajiura
  • Publication number: 20150361534
    Abstract: A steel for a tracked undercarriage component is used as a material constituting a track link (9), for example, and contains: not less than 0.39% by mass and not more than 0.45% by mass of carbon, not less than 0.2% by mass and not more than 1.0% by mass of silicon, not less than 0.10% by mass and not more than 0.90% by mass of manganese, not less than 0.002% by mass and not more than 0.005% by mass of sulfur, not less than 0.1% by mass and not more than 3.0% by mass of nickel, not less than 0.70% by mass and not more than 1.50% by mass of chromium, and not less than 0.10% by mass and not more than 0.60% by mass of molybdenum, with the balance made of iron and unavoidable impurities.
    Type: Application
    Filed: May 8, 2014
    Publication date: December 17, 2015
    Inventors: Eiji AMADA, Kazuo MAEDA, Takeji KAJIURA
  • Patent number: 9009996
    Abstract: An excavating tooth includes a body and an abrasion-resistant layer. The abrasion-resistant layer has hardness higher than the body. The body includes a tip end face, a first face, a second face, a pair of first slope faces, and a pair of second slope faces. The abrasion-resistant layer includes a first abrasion-resistant layer section and a second abrasion-resistant layer section. The first abrasion-resistant layer section is formed on the tip end face. The second abrasion-resistant layer section is formed respectively on the pair of first slope faces and the pair of second slope faces. Thereby, it is possible to obtain an excavating tooth and a body for the excavating tooth capable of keeping a penetration force of a blade edge high in penetrating into an excavation subject.
    Type: Grant
    Filed: January 29, 2013
    Date of Patent: April 21, 2015
    Assignee: Komatsu Ltd.
    Inventors: Eiji Amada, Takanori Nagata, Kenichi Tanaka, Daijirou Itou
  • Patent number: 8997383
    Abstract: A bucket tooth assembly is mounted to an adapter provided to a distal end part of a bucket of construction equipment. The bucket assembly includes a bucket tooth and a latching member. The bucket tooth has a cavity for inserting the adapter and a through-hole that is provided to the side face and communicates through to the adapter when the bucket tooth has been mounted to the adapter. The through-hole has a center axis. The latching member is fitted inside the through-hole and having a rotational axis disposed along a direction of the center axis and a bottom part provided to an end on an adapter side in an axial direction. The latching member is rotated to switch between a first state in which the bottom part is held inside the through-hole and a second state in which the bottom part protrudes toward a concave portion on the adapter side.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: April 7, 2015
    Assignee: Komatsu Ltd.
    Inventors: Daijirou Itou, Takanori Nagata, Eiji Amada, Tsuyoshi Yoshida
  • Patent number: 8832975
    Abstract: A bucket tooth for a construction vehicle includes a through-hole formed in a side wall part and passing through to a cavity. The through-hole has on a cavity side a rotating body hole having a shape of a truncated and rotated cone that remains after removing a large diameter side portion obtained by cutting diagonally to a rotational axis of the truncated and rotated cone with a large diameter side of the truncated and rotated cone being disposed on the cavity side, and with the rotational axis of the truncated and rotated cone being inclined outwardly toward the distal end portion of the bucket tooth from the cavity along a width direction of the bucket tooth.
    Type: Grant
    Filed: May 7, 2012
    Date of Patent: September 16, 2014
    Assignee: Komatsu Ltd.
    Inventors: Daijirou Itou, Takanori Nagata, Eiji Amada, Tsuyoshi Yoshida
  • Publication number: 20140215867
    Abstract: An excavating tooth includes a body and an abrasion-resistant layer. The abrasion-resistant layer has hardness higher than the body. The body includes a tip end face, a first face, a second face, a pair of first slope faces, and a pair of second slope faces. The abrasion-resistant layer includes a first abrasion-resistant layer section and a second abrasion-resistant layer section. The first abrasion-resistant layer section is formed on the tip end face. The second abrasion-resistant layer section is formed respectively on the pair of first slope faces and the pair of second slope faces. Thereby, it is possible to obtain an excavating tooth and a body for the excavating tooth capable of keeping a penetration force of a blade edge high in penetrating into an excavation subject.
    Type: Application
    Filed: January 29, 2013
    Publication date: August 7, 2014
    Applicant: KOMATSU LTD.
    Inventors: Eiji Amada, Takanori Nagata, Kenichi Tanaka, Daijirou Itou
  • Publication number: 20130152432
    Abstract: A bucket tooth for a construction vehicle includes a through-hole formed in a side wall part and passing through to a cavity. The through-hole has on a cavity side a rotating body hole having a shape of a truncated and rotated cone that remains after removing a large diameter side portion obtained by cutting diagonally to a rotational axis of the truncated and rotated cone with a large diameter side of the truncated and rotated cone being disposed on the cavity side, and with the rotational axis of the truncated and rotated cone being inclined outwardly toward the distal end portion of the bucket tooth from the cavity along a width direction of the bucket tooth.
    Type: Application
    Filed: May 7, 2012
    Publication date: June 20, 2013
    Applicant: Komatsu Ltd.
    Inventors: Daijirou Itou, Takanori Nagata, Eiji Amada, Tsuyoshi Yoshida
  • Publication number: 20130152433
    Abstract: A bucket tooth assembly is mounted to an adapter provided to a distal end part of a bucket of construction equipment. The bucket assembly includes a bucket tooth and a latching member. The bucket tooth has a cavity for inserting the adapter and a through-hole that is provided to the side face and communicates through to the adapter when the bucket tooth has been mounted to the adapter. The through-hole has a center axis. The latching member is fitted inside the through-hole and having a rotational axis disposed along a direction of the center axis and a bottom part provided to an end on an adapter side in an axial direction. The latching member is rotated to switch between a first state in which the bottom part is held inside the through-hole and a second state in which the bottom part protrudes toward a concave portion on the adapter side.
    Type: Application
    Filed: April 26, 2012
    Publication date: June 20, 2013
    Inventors: Daijirou Itou, Takanori Nagata, Eiji Amada, Tsuyoshi Yoshida