Patents by Inventor Tatsushi Itoh
Tatsushi Itoh 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).
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Patent number: 8814969Abstract: An exhaust gas emission control system includes a cylindrical inflow body and an inflow pipe into which exhaust gas flows. The exhaust gas emission control system also includes a cylindrical outflow body and an outflow pipe from which the exhaust gas flows. The inflow pipe is provided with a louver member that covers an opening of the inflow body near an upstream side of an exhaust gas flow direction. The louver member is provided with slits and inclined plates capable of changing a flow direction of the exhaust gas passing through the slits into a desired direction.Type: GrantFiled: February 17, 2012Date of Patent: August 26, 2014Assignee: Komatsu Ltd.Inventors: Shouhei Nagasaka, Hiroki Sato, Issei Hara, Yosuke Obuchi, Tatsushi Itoh, Yuuki Kasaoka
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Publication number: 20130097978Abstract: An exhaust gas emission control system includes a cylindrical inflow body and an inflow pipe into which exhaust gas flows. The exhaust gas emission control system also includes a cylindrical outflow body and an outflow pipe from which the exhaust gas flows. The inflow pipe is provided with a louver member that covers an opening of the inflow body near an upstream side of an exhaust gas flow direction. The louver member is provided with slits and inclined plates capable of changing a flow direction of the exhaust gas passing through the slits into a desired direction.Type: ApplicationFiled: February 17, 2012Publication date: April 25, 2013Inventors: Shouhei Nagasaka, Hiroki Sato, Issei Hara, Yosuke Obuchi, Tatsushi Itoh, Yuuki Kasaoka
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Patent number: 7959219Abstract: A reinforcement structure for a pipe includes a hole section and a plate member. The hole section is formed on an outer peripheral surface of the pipe along a longitudinal direction of the pipe to pass through a peripheral wall of the pipe to reach an interior portion of the pipe. The plate member is inserted in the hole section and secured to the pipe.Type: GrantFiled: August 6, 2007Date of Patent: June 14, 2011Assignee: Komatsu Ltd.Inventors: Akihide Namura, Takahiro Noguchi, Tatsushi Itoh, Fumiaki Kawahara
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Patent number: 7712818Abstract: To provide a box-shaped cab for a work machine, on which an operator operates the work machine, having a front surface portion, a rear surface portion, left and right side surface portions, a floor surface portion, and a ceiling surface portion, the cab for a work machine includes: a frame body having a pair of rear side structural members and a pair of lateral side structural members, a pair of rail members each having a vertical portion along the front surface portion and a horizontal portion along the ceiling surface portion; and a rectangular window frame being stored in the front surface portion or the ceiling surface portion, in which the vertical portions of the rail members are directly fixed to the lateral side structural members, and the horizontal portions of the rail members are fixed to the lateral side structural members via intermediate members.Type: GrantFiled: May 11, 2006Date of Patent: May 11, 2010Assignee: Komatsu Ltd.Inventors: Kouzoh Yano, Tatsushi Itoh
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Publication number: 20090273206Abstract: A reinforcement structure for a pipe includes a hole section and a plate member. The hole section is formed on an outer peripheral surface of the pipe along a longitudinal direction of the pipe to pass through a peripheral wall of the pipe to reach an interior portion of the pipe. The plate member is inserted in the hole section and secured to the pipe.Type: ApplicationFiled: August 6, 2007Publication date: November 5, 2009Applicant: KOMATSU LTD.Inventors: Akihide Namura, Takahiro Noguchi, Tatsushi Itoh, Fumiaki Kawahara
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Publication number: 20090026803Abstract: To provide a box-shaped cab for a work machine, on which an operator operates the work machine, having a front surface portion, a rear surface portion, left and right side surface portions, a floor surface portion, and a ceiling surface portion, the cab for a work machine includes: a frame body having a pair of rear side structural members and a pair of lateral side structural members, a pair of rail members each having a vertical portion along the front surface portion and a horizontal portion along the ceiling surface portion; and a rectangular window frame being stored in the front surface portion or the ceiling surface portion, in which the vertical portions of the rail members are directly fixed to the lateral side structural members, and the horizontal portions of the rail members are fixed to the lateral side structural members via intermediate members.Type: ApplicationFiled: May 11, 2006Publication date: January 29, 2009Inventors: Kouzoh Yano, Tatsushi Itoh
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Patent number: 7246846Abstract: A cab capable of easily securing rollover protection strength at low manufacturing cost is offered. Four pillars are mounted in the front and rear, and left and right of the cab. Two of them are mounted respectively in a first position at the outer side portion where it bulges outward and in a second position on the inner side portion and opposite the first position in the left-and-right direction. At least one of the pillars is formed with a pipe. A U-shaped frame is firmly mounted between the upper ends of the left and right rear pillars among the four pillars, and directed rearward to form a U-shaped rear roof frame.Type: GrantFiled: March 23, 2004Date of Patent: July 24, 2007Assignee: Komatsu Ltd.Inventors: Hiroyuki Shioji, Akihide Namura, Tatsushi Itoh
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Patent number: 7011488Abstract: A slide arm for a work implement is provided, which is simply structured to obtain improved assembling precision thereby ensuring smooth operation. To this end, the slide arm is such that a plurality of tubular structural bodies (i.e., outer and inner tubes), each of which is formed by bending a one-piece plate into a shape having a substantially triangular cross-section and circular vertex portions, are telescoped one within the other with sliding members (i.e., plain bearing units and slide block pieces) interposed between them at the vertex portions and such that a sliding mechanism is disposed for sliding the tubular structural bodies.Type: GrantFiled: August 29, 2001Date of Patent: March 14, 2006Assignees: Komatsu Ltd., Kabushiki Kaisha Muroto TekkoshoInventors: Nobuyoshi Masumoto, Tatsushi Itoh, Toshihiko Sakashita
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Publication number: 20050006157Abstract: A cab capable of easily securing rollover protection strength at low manufacturing cost is offered. Four pillars are mounted in the front and rear, and left and right of the cab. Two of them are mounted respectively in a first position at the outer side portion where it bulges outward and in a second position on the inner side portion and opposite the first position in the left-and-right direction. At least one of the pillars is formed with a pipe. A U-shaped frame is firmly mounted between the upper ends of the left and right rear pillars among the four pillars, and directed rearward to form a U-shaped rear roof frame.Type: ApplicationFiled: March 23, 2004Publication date: January 13, 2005Inventors: Hiroyuki Shioji, Akihide Namura, Tatsushi Itoh
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Publication number: 20040131459Abstract: A slide arm for a work implement is provided, which is simply structured to obtain improved assembling precision thereby ensuring smooth operation. To this end, the slide arm is such that a plurality of tubular structural bodies (i.e., outer and inner tubes), each of which is formed by bending a one-piece plate into a shape having a substantially triangular cross-section and circular vertex portions, are telescoped one within the other with sliding members (i.e., plain bearing units and slide block pieces) interposed between them at the vertex portions and such that a sliding mechanism is disposed for sliding the tubular structural bodies.Type: ApplicationFiled: June 16, 2003Publication date: July 8, 2004Inventors: Nobuyoshi Masumoto, Tatsushi Itoh, Toshihiko Sakashita
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Patent number: 6637111Abstract: A boom body comprises a boom front member, a boom intermediate member and a boom rear member. An arm-connection bracket is jointed to the boom front member and a vehicle body-mounting bracket is jointed to the boom rear member, thereby forming a boom. With this structure, a cross section of the boom body is less prone to be deformed and therefore, the plate thickness can be reduced, the rigidity of the boom body can be increased without mounting a cross section restraint material and the cross section of the boom is not deformed. Therefore, it is possible to reduce the boom in weight.Type: GrantFiled: July 8, 2002Date of Patent: October 28, 2003Assignee: Komatsu Ltd.Inventors: Hidetoshi Sasaki, Toshio Tanaka, Tatsushi Itoh, Nobuyoshi Masumoto
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Patent number: 6536652Abstract: An arm body of a working machine has a hollow and triangular cross-section. A bucket-connection bracket is jointed to one longitudinal end of an arm body, and an arm cylinder bracket is jointed to another longitudinal end of the arm body, thereby forming an arm. With the triangular cross-sectional structure, the arm body is less prone to deformation under the stress of a load. The improved triangular cross-sectional structure permits the plate thickness of the arm body to be reduced, and the rigidity of the arm body to be increased without mounting a cross-section restraint material in the arm body. The cross-section of the boom will not deform even though the plate thickness is reduced. Therefore, it is possible to reduce the weight of the boom and still prevent deformation of the boom under heavy load.Type: GrantFiled: October 30, 2001Date of Patent: March 25, 2003Assignee: Komatsu Ltd.Inventors: Hidetoshi Sasaki, Toshio Tanaka, Tatsushi Itoh, Nobuyoshi Masumoto
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Patent number: 6508019Abstract: A boom body (23) comprises a boom front member (20), a boom intermediate member (22) and a boom rear member (21). An arm-connection bracket (24) is jointed to the boom front member (20) and a vehicle body-mounting bracket (25) is jointed to the boom rear member (21), thereby forming a boom. With this structure, a cross section of the boom body (23) is less prone to be deformed and therefore, the plate thickness can be reduced, the rigidity of the boom body (23) can be increased without mounting a cross section restraint material and the cross section of the boom is not deformed. Therefore, it is possible to reduce the boom in weight.Type: GrantFiled: January 18, 2000Date of Patent: January 21, 2003Assignee: Komatsu Ltd.Inventors: Hidetoshi Sasaki, Toshio Tanaka, Tatsushi Itoh, Nobuyoshi Masumoto
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Publication number: 20020170212Abstract: A boom body (23) comprises a boom front member (20), a boom intermediate member (22) and a boom rear member (21). An arm-connection bracket (24) is jointed to the boom front member (20) and a vehicle body-mounting bracket (25) is jointed to the boom rear member (21), thereby forming a boom. With this structure, a cross section of the boom body (23) is less prone to be deformed and therefore, the plate thickness can be reduced, the rigidity of the boom body (23) can be increased without mounting a cross section restraint material and the cross section of the boom is not deformed. Therefore, it is possible to reduce the boom in weight.Type: ApplicationFiled: July 8, 2002Publication date: November 21, 2002Applicant: KOMATSU LTD.Inventors: Hidetoshi Sasaki, Toshio Tanaka, Tatsushi Itoh, Nobuyoshi Masumoto
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Publication number: 20020056212Abstract: An arm body of a working machine has a hollow and triangular cross-section. A bucket-connection bracket is jointed to one longitudinal end of an arm body, and an arm cylinder bracket is jointed to another longitudinal end of the arm body, thereby forming an arm. With the triangular cross-sectional structure, the arm body is less prone to deformation under the stress of a load. The improved triangular cross-sectional structure permits the plate thickness of the arm body to be reduced, and the rigidity of the arm body to be increased without mounting a cross-section restraint material in the arm body. The cross-section of the boom will not deform even though the plate thickness is reduced. Therefore, it is possible to reduce the weight of the boom and still prevent deformation of the boom under heavy load.Type: ApplicationFiled: October 30, 2001Publication date: May 16, 2002Applicant: KOMATSU LTD.Inventors: Hidetoshi Sasaki, Toshio Tanaka, Tatsushi Itoh, Nobuyoshi Masumoto
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Patent number: 6349489Abstract: An arm body of a working machine has a hollow and triangular cross-section. A bucket-connection bracket is jointed to one longitudinal end of an arm body, and an arm cylinder bracket is jointed to another longitudinal end of the arm body, thereby forming an arm. With the triangular cross-sectional structure, the arm body is less prone to deformation under the stress of a load. The improved triangular cross-sectional structure permits the plate thickness of the arm body to be reduced, and the rigidity of the arm body to be increased without mounting a cross-section restraint material in the arm body. The cross-section of the boom will not deform even though the plate thickness is reduced. Therefore, it is possible to reduce the weight of the boom and still prevent deformation of the boom under heavy load.Type: GrantFiled: January 18, 2000Date of Patent: February 26, 2002Assignee: Komatsu Ltd.Inventors: Hidetoshi Sasaki, Toshio Tanaka, Tatsushi Itoh, Nobuyoshi Masumoto