Patents by Inventor Daijirou Itou

Daijirou Itou 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: 9481412
    Abstract: A crawler belt and a master link for use in the crawler belt enable easy connection and disconnection of the crawler belt. The crawler belt has a track chain in which a plurality of regular links are pivotally connected at their ends, the master link for connecting the of the track chain to form the crawler belt into a loop, and track shoes attached to the regular links and the master link respectively. The crawler belt has a slit aperture which leads only to a pin insertion hole formed at the other end of the master link and is configured such that a clamping force, generated by tightening a master bolt that imparts a tightening force to the master link to narrow the slit aperture, is allowed to work on only the regular pin inserted into a pin insertion hole leading to the slit aperture.
    Type: Grant
    Filed: November 19, 2015
    Date of Patent: November 1, 2016
    Assignee: KOMATSU LTD.
    Inventors: Tomoyuki Tsubaki, Daijirou Itou, Kenichi Hisamatsu, Shigeto Marumoto
  • Publication number: 20160068206
    Abstract: A crawler belt and a master link for use in the crawler belt enable easy connection and disconnection of the crawler belt. The crawler belt has a track chain in which a plurality of regular links are pivotally connected at their ends, the master link for connecting the of the track chain to form the crawler belt into a loop, and track shoes attached to the regular links and the master link respectively. The crawler belt has a slit aperture which leads only to a pin insertion hole formed at the other end of the master link and is configured such that a clamping force, generated by tightening a master bolt that imparts a tightening force to the master link to narrow the slit aperture, is allowed to work on only the regular pin inserted into a pin insertion hole leading to the slit aperture.
    Type: Application
    Filed: November 19, 2015
    Publication date: March 10, 2016
    Applicant: KOMATSU LTD.
    Inventors: Tomoyuki TSUBAKI, Daijirou ITOU, Kenichi HISAMATSU, Shigeto MARUMOTO
  • Patent number: 9199678
    Abstract: A crawler belt and a master link for use in the crawler belt enable easy connection and disconnection of the crawler belt. The crawler belt has a track chain in which a plurality of regular links are pivotally connected at their ends, the master link for connecting the ends of the track chain to form the crawler belt into a loop, and track shoes attached to the regular links and the master link respectively. The crawler belt has a slit aperture which leads only to a pin insertion hole formed at the other end of the master link and is configured such that a clamping force, generated by tightening a master bolt that imparts a tightening force to the master link to narrow the slit aperture, is allowed to work on only the regular pin inserted into a pin insertion hole leading to the slit aperture.
    Type: Grant
    Filed: April 22, 2011
    Date of Patent: December 1, 2015
    Assignee: KOMATSU LTD
    Inventors: Tomoyuki Tsubaki, Daijirou Itou, Kenichi Hisamatsu, Shigeto Marumoto
  • Patent number: 9121697
    Abstract: A wear amount measuring device includes an image display unit, an image processing unit, and a wear amount computing unit. The image display unit displays a real object image based on real object image data containing a wear amount measurement target and a reference part, and displays a plan image based on design plan data containing the wear amount measurement target and the reference part. The image processing unit executes an image processing of overlapping the real object image and the plan image at an equal scale on a corresponding positional relation when the reference parts are matched. The wear amount computing unit computes a wear amount based on a magnitude of an interval between a measurement contour line drawn along a contour of the wear amount measurement target in the real object image and a plan contour line in the plan image.
    Type: Grant
    Filed: January 19, 2011
    Date of Patent: September 1, 2015
    Assignee: KOMATSU LTD.
    Inventors: Shigeto Marumoto, Hideyuki Wakai, Yukihiro Suzaki, Daijirou Itou, Tomoyuki Tsubaki, Kenichi Hisamatsu
  • Patent number: 9074353
    Abstract: An excavating bucket includes a pair of left and right corner adapters that are fixed with respect to inclined parts provided on protruding parts at the left and right ends on the distal end side of a cutting edge. Tooth members are attached to the distal ends of the corner adapters for excavation. Distal end positions of the corner adapters are disposed on the same line as the distal end positions of a plurality of center adapters.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: July 7, 2015
    Assignee: KOMATSU LTD.
    Inventors: Daijirou Tanaka, Daijirou Itou
  • 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
  • Publication number: 20140331528
    Abstract: An excavating bucket includes a pair of left and right corner adapters that are fixed with respect to inclined parts provided on protruding parts at the left and right ends on the distal end side of a cutting edge. Tooth members are attached to the distal ends of the corner adapters for excavation. Distal end positions of the corner adapters are disposed on the same line as the distal end positions of a plurality of center adapters.
    Type: Application
    Filed: December 21, 2012
    Publication date: November 13, 2014
    Inventors: Daijirou Tanaka, Daijirou Itou
  • Patent number: 8875422
    Abstract: An excavating bucket includes a cutting edge having inclined parts at its left and right ends, a plurality of adapters fixed to the distal end side of the cutting edge, corner adapters that are fixed to the inclined parts provided to the left and right ends on the cutting edge on the distal end side, whose distal end positions are disposed on the same line as the distal end positions of the plurality of center adapters, and that have recesses into which side plates are inserted, and joint portions where the corner adapters are joined to only the cutting edge by continuous weld.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: November 4, 2014
    Assignee: Komatsu Ltd.
    Inventors: Daijirou Tanaka, Daijirou Itou
  • Patent number: 8851826
    Abstract: A bottom surface part of a bucket includes first and second curved surface parts. The second curved surface part is positioned closer to a back surface part than the first curved surface part. A second curvature radius of the second curved surface part is shorter than a first curvature radius of the first curved surface part. The center of the first curvature radius is positioned to the outside of a main bucket body when viewed from the side. In a horizontal state, the first curved surface part is arranged along or above a reference curved surface when viewed from the side. A connecting part between the first curved surface part and the second curved surface part is positioned more towards a lip part than the portion of the bottom surface part that is positioned lowest in the bottom surface part in the horizontal state when viewed from the side.
    Type: Grant
    Filed: October 19, 2010
    Date of Patent: October 7, 2014
    Assignee: Komatsu Ltd.
    Inventors: Takanori Nagata, Kenichi Higuchi, Masakuni Ueda, Kouzou Ishida, Daijirou Itou
  • 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
  • Patent number: 8495826
    Abstract: A work implement includes a ground engaging tool with a first through-hole, an adapter with a second through-hole, a retaining pin, a metal bushing and a metal retainer. The retaining pin is inserted into the first and second through-holes disposed in a state in which the ground engaging tool is in contact with the adapter. The retaining pin is inserted in an inside of an cylindrical member of the bushing, which is disposed at an end portion of the retaining pin inside the first through-hole. The metal retainer prevents the bushing from coming loose from the retaining pin by sandwiching the bushing between the metal retainer and the adapter at the end of the retaining pin. The bushing is disposed in a state that allows movement in an axial direction of the retaining pin between the adapter and the retainer on an outer peripheral face of the retaining pin.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: July 30, 2013
    Assignee: Komatsu Ltd.
    Inventors: Daijirou Itou, Kouzou Ishida, Takanori Nagata, Keita Mutou
  • 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
  • Publication number: 20120306916
    Abstract: A wear amount measuring device includes an image display unit, an image processing unit, and a wear amount computing unit. The image display unit displays a real object image based on real object image data containing a wear amount measurement target and a reference part, and displays a plan image based on design plan data containing the wear amount measurement target and the reference part. The image processing unit executes an image processing of overlapping the real object image and the plan image at an equal scale on a corresponding positional relation when the reference parts are matched. The wear amount computing unit computes a wear amount based on a magnitude of an interval between a measurement contour line drawn along a contour of the wear amount measurement target in the real object image and a plan contour line in the plan image.
    Type: Application
    Filed: January 19, 2011
    Publication date: December 6, 2012
    Applicant: KOMATSU LTD.
    Inventors: Shigeto Marumoto, Hideyuki Wakai, Yukihiro Suzaki, Daijirou Itou, Tomoyuki Tsubaki, Kenichi Hisamatsu
  • Publication number: 20120301258
    Abstract: A bottom surface part of a bucket includes first and second curved surface parts. The second curved surface part is positioned closer to a back surface part than the first curved surface part. A second curvature radius of the second curved surface part is shorter than a first curvature radius of the first curved surface part. The center of the first curvature radius is positioned to the outside of a main bucket body when viewed from the side. In a horizontal state, the first curved surface part is arranged along or above a reference curved surface when viewed from the side. A connecting part between the first curved surface part and the second curved surface part is positioned more towards a lip part than the portion of the bottom surface part that is positioned lowest in the bottom surface part in the horizontal state when viewed from the side.
    Type: Application
    Filed: October 19, 2010
    Publication date: November 29, 2012
    Applicant: KOMATSU LTD.
    Inventors: Takanori Nagata, Kenichi Higuchi, Masakuni Ueda, Kouzou Ishida, Daijirou Itou
  • Publication number: 20120222336
    Abstract: A work implement includes a ground engaging tool with a first through-hole, an adapter with a second through-hole, a retaining pin, a metal bushing and a metal retainer. The retaining pin is inserted into the first and second through-holes disposed in a state in which the ground engaging tool is in contact with the adapter. The retaining pin is inserted in an inside of an cylindrical member of the bushing, which is disposed at an end portion of the retaining pin inside the first through-hole. The metal retainer prevents the bushing from coming loose from the retaining pin by sandwiching the bushing between the metal retainer and the adapter at the end of the retaining pin. The bushing is disposed in a state that allows movement in an axial direction of the retaining pin between the adapter and the retainer on an outer peripheral face of the retaining pin.
    Type: Application
    Filed: March 30, 2011
    Publication date: September 6, 2012
    Applicant: KOMATSU LTD.
    Inventors: Daijirou Itou, Kouzou Ishida, Takanori Nagata, Keita Mutou
  • Publication number: 20120153715
    Abstract: A crawler belt and a master link for use in the crawler belt enable easy connection and disconnection of the crawler belt. The crawler belt has a track chain, in which a plurality of regular links are pivotally connected at their ends, the master link for connecting the ends of the track chain to form the crawler belt into a loop, and track shoes attached to the regular links and the master link respectively. The crawler belt has a slit aperture which leads only to a pin insertion hole formed at the other end of the master link and is configured such that a clamping force, generated by tightening a master bolt that imparts a tightening force to the master link to narrow the slit aperture, is allowed to work on only the regular pin inserted into a pin insertion hole leading to the slit aperture.
    Type: Application
    Filed: April 22, 2011
    Publication date: June 21, 2012
    Inventors: Tomoyuki Tsubaki, Daijirou Itou, Kenichi Hisamatsu, Shigeto Marumoto