Patents by Inventor Daijirou Tanaka
Daijirou Tanaka 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: 11808018Abstract: A bucket tooth adapter for a bucket includes a mounting portion and a nose portion extending from the mounting portion. The mounting portion includes a first body portion and a wide portion. The wide portion is wider than the first body portion and is provided between the first body portion and the nose portion.Type: GrantFiled: September 9, 2020Date of Patent: November 7, 2023Assignee: KOMATSU LTD.Inventors: Takanori Nagata, Daijirou Tanaka, Yudai Furudate, Tatsuo Aira, Monta Kondou
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Publication number: 20230332380Abstract: A ripper point attachment structure in a ripper device includes a ripper shank including a main body portion and a nose portion, and a ripper point including an internal space. The nose portion includes a distal end portion, a proximal end portion contiguous with the main body portion, and a linking portion. An outer periphery of a cross section cutting the linking portion along a plane perpendicular to an axis extending in a lengthwise direction of the nose portion is formed in an octagonal shape. An outer periphery of a cross section cutting the proximal end portion along the plane is formed in a rectangular shape. An outer periphery of a cross section cutting the distal end portion along the plane is formed in a rectangular shape. An inner periphery forming the internal space is formed along an outer periphery forming the distal end, linking and proximal end portions.Type: ApplicationFiled: October 5, 2021Publication date: October 19, 2023Inventors: Yudai FURUDATE, Masakuni UEDA, Daijirou TANAKA, Jinnai HATSUSHI, Monta KONDOU
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Publication number: 20230332381Abstract: With a ripper point attachment structure, a pin member is inserted into a first pin hole formed in a ripper shank and a second pin hole formed in a ripper point. A locking member is engaged with the pin member to prevent the pin member from coming loose. The ripper point includes an opening, an internal space and a guide groove. The opening is formed at a rear end. The internal space is formed from the opening toward a distal end surface. The guide groove is formed in a predetermined range from the rear end toward the distal end surface in a portion of an inner surface forming the internal space. A second pin hole of the ripper point is disposed on a bottom surface of the guide groove. The locking member is disposed in a space forming the guide groove.Type: ApplicationFiled: October 5, 2021Publication date: October 19, 2023Inventors: Yudai FURUDATE, Daijirou TANAKA, Masakuni UEDA, Monta KONDOU, Jinnai HATSUSHI
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Patent number: 11661726Abstract: A tooth attachment structure for a bucket includes a tooth, a pin member, and a lock member. The tooth includes a guide groove provided on an inner surface of the tooth and a pin hole provided in the guide groove. The pin member is disposed in the pin hole. The lock member is disposed in the guide groove. The lock member locks the pin member. The lock member engages the pin member by sliding toward the pin member.Type: GrantFiled: September 9, 2020Date of Patent: May 30, 2023Assignee: KOMATSU LTD.Inventors: Takanori Nagata, Daijirou Tanaka, Yudai Furudate, Tatsuo Aira, Monta Kondou
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Patent number: 11598074Abstract: A tooth mounting structure for a bucket includes a tooth adapter and a tooth. The tooth adapter includes a mounting portion mounted to the bucket and a nose portion extending from the mounting portion. The tooth includes an internal space for inserting the nose portion. The nose portion includes a rectangular tip portion, a rectangular base end portion and an octagonal connecting portion. An inner surface of the tooth is formed along an outer surface of the nose portion.Type: GrantFiled: September 9, 2020Date of Patent: March 7, 2023Assignee: KOMATSU LTD.Inventors: Takanori Nagata, Daijirou Tanaka, Yudai Furudate, Tatsuo Aira, Monta Kondou
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Publication number: 20220298758Abstract: A tooth attachment structure for a bucket includes a tooth, a pin member, and a lock member. The tooth includes a guide groove provided on an inner surface of the tooth and a pin hole provided in the guide groove. The pin member is disposed in the pin hole. The lock member is disposed in the guide groove. The lock member locks the pin member. The lock member engages the pin member by sliding toward the pin member.Type: ApplicationFiled: September 9, 2020Publication date: September 22, 2022Inventors: Takanori NAGATA, Daijirou TANAKA, Yudai FURUDATE, Tatsuo AIRA, Monta KONDOU
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Publication number: 20220290412Abstract: A bucket tooth adapter for a bucket includes a mounting portion and a nose portion extending from the mounting portion. The mounting portion includes a first body portion and a wide portion. The wide portion is wider than the first body portion and is provided between the first body portion and the nose portion.Type: ApplicationFiled: September 9, 2020Publication date: September 15, 2022Inventors: Takanori NAGATA, Daijirou TANAKA, Yudai FURUDATE, Tatsuo AIRA, Monta KONDOU
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Publication number: 20220275608Abstract: A tooth mounting structure for a bucket includes a tooth adapter and a tooth. The tooth adapter includes a mounting portion mounted to the bucket and a nose portion extending from the mounting portion. The tooth includes an internal space for inserting the nose portion. The nose portion includes a rectangular tip portion, a rectangular base end portion and an octagonal connecting portion. An inner surface of the tooth is formed along an outer surface of the nose portion.Type: ApplicationFiled: September 9, 2020Publication date: September 1, 2022Inventors: Takanori NAGATA, Daijirou TANAKA, Yudai FURUDATE, Tatsuo AIRA, Monta KONDOU
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Patent number: 9803332Abstract: An excavation bucket includes a bottom face part, a rear face part, a pair of opposing side wall parts, teeth, a bracket, and a target penetration depth display component. The target penetration depth display component is provided around the teeth and near an end of the side wall part that forms an edge of an opening, and displays the target penetration depth. A wrist radius is an imaginary line segment connecting a center of a first hole in the bracket and the distal end of the teeth in side view. The target penetration depth display component is provided to an inside of at least one of the pair of opposing side wall parts and at a position of the side wall part corresponding to a position that has moved along the imaginary line segment from the distal end of the teeth by a specific proportional length of the wrist radius.Type: GrantFiled: February 19, 2015Date of Patent: October 31, 2017Assignee: KOMATSU LTD.Inventors: Daijirou Tanaka, Tatsuo Aira
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Publication number: 20160369475Abstract: An excavation bucket includes a bottom face part, a rear face part, a pair of opposing side wall parts, teeth, a bracket, and a target penetration depth display component. The target penetration depth display component is provided around the teeth and near an end of the side wall part that forms an edge of an opening, and displays the target penetration depth. A wrist radius is an imaginary line segment connecting a center of a first hole in the bracket and the distal end of the teeth in side view. The target penetration depth display component is provided to an inside of at least one of the pair of opposing side wall parts and at a position of the side wall part corresponding to a position that has moved along the imaginary line segment from the distal end of the teeth by a specific proportional length of the wrist radius.Type: ApplicationFiled: February 19, 2015Publication date: December 22, 2016Applicant: KOMATSU LTD.Inventors: Daijirou TANAKA, Tatsuo AIRA
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Patent number: 9074353Abstract: 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: GrantFiled: December 21, 2012Date of Patent: July 7, 2015Assignee: KOMATSU LTD.Inventors: Daijirou Tanaka, Daijirou Itou
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Publication number: 20140331528Abstract: 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: ApplicationFiled: December 21, 2012Publication date: November 13, 2014Inventors: Daijirou Tanaka, Daijirou Itou
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Patent number: 8875422Abstract: 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: GrantFiled: December 21, 2012Date of Patent: November 4, 2014Assignee: Komatsu Ltd.Inventors: Daijirou Tanaka, Daijirou Itou
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Publication number: 20140059900Abstract: 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: ApplicationFiled: December 21, 2012Publication date: March 6, 2014Applicant: KOMATSU LTD.Inventors: Daijirou Tanaka, Daijirou Ito
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Patent number: 6532933Abstract: The invention includes a combustion chamber and an injection strategy for a direct fuel injected internal combustion engine. The combustion chamber is formed with a substantially flat surface to provide a large surface area on which fuel can collect and evaporated. At high loads, fuel is injected into the combustion in two stages. The first stage starts before top-dead center and stops before a prohibited range where smoke is produced. The second stage starts after the prohibited range and stops approximately when the intake valve is at its maximum lift.Type: GrantFiled: March 15, 2000Date of Patent: March 18, 2003Assignee: Yamaha Hatsudoki Kabushiki KaishaInventors: Daijirou Tanaka, Uichitake Uchiyama
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Patent number: 6508226Abstract: An improved combustion chamber configuration for a direct injected internal combustion engine. The cylinder head recess and piston head are configured so as to provide a small clearance volume and accordingly high compression ratios while the shape of the piston head and the arrangement of the cylinder head recess permits a portion of the injected fuel to be directed toward the exhaust valves to cool them and reduce smoke and increase fuel efficiency.Type: GrantFiled: September 21, 2001Date of Patent: January 21, 2003Assignee: Yamaha Hatsudoki Kabushiki KaishaInventors: Daijirou Tanaka, Shinichi Kurosawa