Patents by Inventor Yoshihiro Komuro
Yoshihiro Komuro 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: 11992920Abstract: An electric tool to restrain stress concentration is provided. The electric tool includes a housing (7, 8), a motor (2), an anvil (5, 105), and an impact mechanism (4). The motor is accommodated in the housing and rotatable. The anvil supported by the housing and rotatable about an axis (A). The impact mechanism is configured to convert a rotational force generated by the motor into a rotational impact force about the axis, and to apply the rotational impact force to the anvil. The anvil includes a base portion (51), an end bit attachment portion (80, 180), and a connecting portion (90, 190). The base portion is rotatably supported by the housing. An end bit is attachable to the end bit attachment portion. The end bit attachment portion has a flat surface portion. The connecting portion integrally connects together the base portion and the end bit attachment portion. The connecting portion has a diameter gradually reduced in a direction from the base portion toward the end bit attachment portion.Type: GrantFiled: August 31, 2018Date of Patent: May 28, 2024Assignee: KOKI HOLDINGS CO., LTD.Inventors: Kengo Tamura, Junichi Toukairin, Yoshihiro Komuro
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Patent number: 11577376Abstract: Provided is an electric device capable of suppressing vibration of a battery pack. Included are: a first housing 21 accommodating a load portion that consumes electric power; a second housing 22 having one end portion connected to the first housing 21 and another end portion to which a battery pack 9 is connectable; and an elastic member 40 interposed between the first housing and the second housing. The first housing includes a first restricting portion 42 positioned away from the elastic member, and the second housing includes a second restricting portion 44 positioned away from the elastic member and engageable with the first restricting portion. In a case where the second housing is urged to be separated from the first housing, the elastic member is deformed and the first restricting portion and the second restricting portion are engaged with each other to prevent separation.Type: GrantFiled: August 31, 2018Date of Patent: February 14, 2023Assignee: KOKI HOLDINGS CO., LTD.Inventors: Kengo Tamura, Takuhiro Murakami, Junichi Toukairin, Yoshihiro Komuro, Masaru Hirano
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Patent number: 11440166Abstract: An impact tool and method can include: a motor; a trigger; a controller configured to control driving power supplied to the motor using a semiconductor switching element according to an operation of the trigger; a striking mechanism configured to drive a tip tool continuously or intermittently by rotation force of the motor, the striking mechanism including a hammer and an anvil. The controller drives the semiconductor switching element at a high duty ratio when the trigger is manipulated. The motor can be driven so that the duty ratio is lowered before a first striking of the hammer on the anvil is performed and the first striking is performed at a low duty ratio lower than the high duty ratio.Type: GrantFiled: February 16, 2020Date of Patent: September 13, 2022Assignee: KOKI HOLDINGS CO., LTD.Inventors: Kazutaka Iwata, Yoshihiro Komuro
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Publication number: 20200215679Abstract: Provided is an electric device capable of suppressing vibration of a battery pack. Included are: a first housing 21 accommodating a load portion that consumes electric power; a second housing 22 having one end portion connected to the first housing 21 and another end portion to which a battery pack 9 is connectable; and an elastic member 40 interposed between the first housing and the second housing. The first housing includes a first restricting portion 42 positioned away from the elastic member, and the second housing includes a second restricting portion 44 positioned away from the elastic member and engageable with the first restricting portion. In a case where the second housing is urged to be separated from the first housing, the elastic member is deformed and the first restricting portion and the second restricting portion are engaged with each other to prevent separation.Type: ApplicationFiled: August 31, 2018Publication date: July 9, 2020Applicant: KOKI HOLDINGS CO., LTD.Inventors: Kengo TAMURA, Takuhiro MURAKAMI, Junichi TOUKAIRIN, Yoshihiro KOMURO, Masaru HIRANO
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Publication number: 20200215667Abstract: An electric tool to restrain stress concentration is provided. The electric tool includes a housing (7, 8), a motor (2), an anvil (5, 105), and an impact mechanism (4). The motor is accommodated in the housing and rotatable. The anvil supported by the housing and rotatable about an axis (A). The impact mechanism is configured to convert a rotational force generated by the motor into a rotational impact force about the axis, and to apply the rotational impact force to the anvil. The anvil includes a base portion (51), an end bit attachment portion (80, 180), and a connecting portion (90, 190). The base portion is rotatably supported by the housing. An end bit is attachable to the end bit attachment portion. The end bit attachment portion has a flat surface portion. The connecting portion integrally connects together the base portion and the end bit attachment portion. The connecting portion has a diameter gradually reduced in a direction from the base portion toward the end bit attachment portion.Type: ApplicationFiled: August 31, 2018Publication date: July 9, 2020Applicant: KOKI HOLDINGS CO., LTD.Inventors: Kengo TAMURA, Junichi TOUKAIRIN, Yoshihiro KOMURO
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Publication number: 20200180125Abstract: An impact tool and method can include: a motor; a trigger; a controller configured to control driving power supplied to the motor using a semiconductor switching element according to an operation of the trigger; a striking mechanism configured to drive a tip tool continuously or intermittently by rotation force of the motor, the striking mechanism including a hammer and an anvil. The controller drives the semiconductor switching element at a high duty ratio when the trigger is manipulated. The motor can be driven so that the duty ratio is lowered before a first striking of the hammer on the anvil is performed and the first striking is performed at a low duty ratio lower than the high duty ratio.Type: ApplicationFiled: February 16, 2020Publication date: June 11, 2020Inventors: Kazutaka Iwata, Yoshihiro Komuro
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Patent number: 10562160Abstract: An impact tool includes: a motor; a trigger; a controller configured to control driving power supplied to the motor using a semiconductor switching element according to an operation of the trigger; a striking mechanism configured to drive a tip tool continuously or intermittently by rotation force of the motor, the striking mechanism including a hammer and an anvil. The controller drives the semiconductor switching element at a high duty ratio when the trigger is manipulated. The motor is driven so that the duty ratio is lowered before a first striking of the hammer on the anvil is performed and the first striking is performed at a low duty ratio lower than the high duty ratio.Type: GrantFiled: December 18, 2013Date of Patent: February 18, 2020Assignee: KOKI HOLDINGS CO., LTD.Inventors: Kazutaka Iwata, Yoshihiro Komuro
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Patent number: 9774017Abstract: An electric device body in which a battery pack including a plurality of battery cells and a plurality of first terminals is detachably mounted includes: a housing; a guide mechanism; and a plurality of second terminals; and a pressed portion. The battery pack is configured to be attached to and detached from the housing along a first direction. The guide mechanism is provided at the housing and configured to define the first direction. The plurality of second terminals is configured to be connected to the plurality of first terminals upon attachment of the battery pack to the housing. The pressed portion is configured to be pressed against the battery pack in a second direction intersecting the first direction when the battery pack has been attached to the housing.Type: GrantFiled: January 14, 2014Date of Patent: September 26, 2017Assignee: Hitachi Koki Co., Ltd.Inventors: Hiroki Uchida, Yoshihiro Nakano, Yoshihiro Komuro, Tetsuhiro Harada, Hideyuki Tanimoto
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Publication number: 20160318163Abstract: An impact tool includes: a spindle which makes a rotation motion; a hammer which makes a reciprocating motion in a longitudinal direction; a spring whose front end is supported on the hammer side and rear end is supported on the spindle side; and a stopper fixed to the spindle so that it abuts on the hammer when the hammer is moved rearward, and the rear end of the spring and the stopper are mutually overlapped with each other in the longitudinal direction.Type: ApplicationFiled: December 15, 2014Publication date: November 3, 2016Applicant: Hitachi Koki Co., Ltd.Inventors: Yoshihiro KOMURO, Kengo TAMURA
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Patent number: 9391491Abstract: A power tool includes a housing, a brushless motor, and a cover member. The housing has an air intake hole and an air exhaust hole formed therein, the housing having an inner surface. The brushless motor has an outer surface disposed in the housing, a first endface near the air intake hole, and a second endface near the air exhaust hole. The cover member covers at least one of the first endface and the second endface for preventing dust from entering the brushless motor. The inner surface of the housing and outer surface of the brushless motor define a circulation path providing communication between the air intake hole and the air exhaust hole.Type: GrantFiled: September 20, 2013Date of Patent: July 12, 2016Assignee: HITACHI KOKI CO., LTD.Inventors: Kenichirou Yoshida, Katsuhiro Oomori, Yoshihiro Komuro, Kazutaka Iwata
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Publication number: 20150336249Abstract: An impact tool includes: a motor; a trigger; a controller configured to control driving power supplied to the motor using a semiconductor switching element according to an operation of the trigger; a striking mechanism configured to drive a tip tool continuously or intermittently by rotation force of the motor, the striking mechanism including a hammer and an anvil. The controller drives the semiconductor switching element at a high duty ratio when the trigger is manipulated. The motor is driven so that the duty ratio is lowered before a first striking of the hammer on the anvil is performed and the first striking is performed at a low duty ratio lower than the high duty ratio.Type: ApplicationFiled: December 18, 2013Publication date: November 26, 2015Inventors: Kazutaka Iwata, Yoshihiro Komuro
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Publication number: 20140145524Abstract: An electric power tool including: a motor; and a rotary impact mechanism configured to be driven by the motor, wherein the motor is configured such that a rotation speed thereof can be set within a range of 14600 to 19000 min?1 when a motor torque is within a torque range during practical operation.Type: ApplicationFiled: November 26, 2013Publication date: May 29, 2014Applicant: HITACHI KOKI CO., LTD.Inventors: Hideyuki Tanimoto, Yoshihiro Nakano, Hiroki Uchida, Yoshihiro Komuro
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Publication number: 20140015350Abstract: A power tool includes a housing, a brushless motor, and a cover member. The housing has an air intake hole and an air exhaust hole formed therein, the housing having an inner surface. The brushless motor has an outer surface disposed in the housing, a first endface near the air intake hole, and a second endface near the air exhaust hole. The cover member covers at least one of the first endface and the second endface for preventing dust from entering the brushless motor. The inner surface of the housing and outer surface of the brushless motor define a circulation path providing communication between the air intake hole and the air exhaust hole.Type: ApplicationFiled: September 20, 2013Publication date: January 16, 2014Applicant: Hitachi KoKi Co., Ltd.Inventors: Kenichirou Yoshida, Katsuhiro Oomori, Yoshihiro Komuro, Kazutaka Iwata
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Patent number: 8541913Abstract: A power tool includes a housing, a brushless motor, and a cover member. The housing has an air intake hole and an air exhaust hole formed therein, the housing having an inner surface. The brushless motor has an outer surface disposed in the housing, a first endface near the air intake hole, and a second endface near the air exhaust hole. The cover member covers at least one of the first endface and the second endface for preventing dust from entering the brushless motor. The inner surface of the housing and outer surface of the brushless motor define a circulation path providing communication between the air intake hole and the air exhaust hole.Type: GrantFiled: April 13, 2012Date of Patent: September 24, 2013Assignee: Hitachi Koki Co., Ltd.Inventors: Kenichirou Yoshida, Katsuhiro Oomori, Yoshihiro Komuro, Kazutaka Iwata
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Patent number: 8513838Abstract: An electric power tool includes: a motor including a motor shaft; a tip tool driven by the motor; a housing that houses the motor; a switching element for driving the motor; and a bearing that can retain the motor shaft. The switching element is provided so as to overlap with the bearing in a direction of the motor shaft inside the housing.Type: GrantFiled: May 11, 2010Date of Patent: August 20, 2013Assignee: Hitachi Koki Co., Ltd.Inventors: Junichi Toukairin, Takashi Takeda, Yoshihiro Komuro, Yuji Kishima, Yasuoki Kawahata
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Patent number: 8253285Abstract: A power tool includes a housing, a brushless motor, and a cover member. The housing has an air intake hole and an air exhaust hole formed therein, the housing having an inner surface. The brushless motor has an outer surface disposed in the housing, a first endface near the air intake hole, and a second endface near the air exhaust hole. The cover member covers at least one of the first endface and the second endface for preventing dust from entering the brushless motor. The inner surface of the housing and outer surface of the brushless motor define a circulation path providing communication between the air intake hole and the air exhaust hole.Type: GrantFiled: April 17, 2008Date of Patent: August 28, 2012Assignee: Hitachi Koki Co., Ltd.Inventors: Kenichirou Yoshida, Katsuhiro Oomori, Yoshihiro Komuro, Kazutaka Iwata
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Publication number: 20120200181Abstract: A power tool includes a housing, a brushless motor, and a cover member. The housing has an air intake hole and an air exhaust hole formed therein, the housing having an inner surface. The brushless motor has an outer surface disposed in the housing, a first endface near the air intake hole, and a second endface near the air exhaust hole. The cover member covers at least one of the first endface and the second endface for preventing dust from entering the brushless motor. The inner surface of the housing and outer surface of the brushless motor define a circulation path providing communication between the air intake hole and the air exhaust hole.Type: ApplicationFiled: April 13, 2012Publication date: August 9, 2012Inventors: Kenichirou Yoshida, Katsuhiro Oomori, Yoshihiro Komuro, Kazutaka Iwata
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Patent number: 8084901Abstract: According to an aspect of the present invention, there is provided a power tool including: a housing having a suction port formed thereon to introduce an cooling air from an outside of the housing; and a brushless motor that is housed in the housing and has an electric circuit, the electric circuit having a heat radiating surface, wherein the heat radiating surface is disposed in a neighborhood of the suction port.Type: GrantFiled: June 17, 2008Date of Patent: December 27, 2011Assignee: Hitachi Koki Co., Ltd.Inventors: Katsuhiro Oomori, Yoshihiro Komuro, Kenichirou Yoshida, Kazutaka Iwata
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Patent number: D735006Type: GrantFiled: February 21, 2014Date of Patent: July 28, 2015Assignee: Hitachi Koki Co., Ltd.Inventors: Yoshiki Aoki, Masato Sakai, Rui Akiba, Hiroki Uchida, Masanori Okada, Yoshihiro Komuro
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Patent number: D855212Type: GrantFiled: August 4, 2017Date of Patent: July 30, 2019Assignee: Nippon Sheet Glass Company, LimitedInventor: Yoshihiro Komuro