Patents by Inventor Kuniaki Kanbe
Kuniaki Kanbe 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: 11052530Abstract: Provided is an electric work machine that can suppress a temperature increase of a component controlling an electric motor. The electric work machine including a brushless motor that operates a tip tool includes a rectification circuit that converts a voltage to be applied to the brushless motor from an alternating current voltage to a direct current voltage, and a switching circuit that controls the brushless motor, and the rectification circuit is arranged upstream of the switching circuit in a circulation path of the air that cools the rectification circuit and the switching circuit.Type: GrantFiled: September 29, 2015Date of Patent: July 6, 2021Assignee: KOKI HOLDINGS CO., LTD.Inventors: Akira Matsushita, Tomomasa Nishikawa, Yuta Noguchi, Kuniaki Kanbe, Shingo Yamazaki
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Patent number: 10632605Abstract: The disclosure provides a work tool having an electric motor, a power transmission means that receives motive power from the electric motor and transmits the motive power to a tip tool, a gear housing for accommodating at least a portion of the power transmission means, weights swingably supported on the gear housing, and coil springs that function as an urging means for urging the weights such that the weights are located at an initial neutral position, wherein the weights and the coil springs are provided respectively on the two sides of the gear housing so as to put the power transmission means therebetween, and a rotational support axle is provided that functions as a connecting means for connecting the weights provided on both sides of the gear housing so as to connect the weights such that the weights swing integrally.Type: GrantFiled: April 30, 2015Date of Patent: April 28, 2020Assignee: KOKI HOLDINGS CO., LTD.Inventors: Daijiro Tanabe, Goya Fujimoto, Ryusuke Kobayashi, Kuniaki Kanbe, Shinichirou Satou
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Patent number: 10618157Abstract: An electric power tool has a brushless motor for driving a tip tool, and a motor case is at least partly covered by a motor housing made of aluminum alloy and exposed to an outside. A control board provided with a control circuit for controlling the rotation of the brushless motor is disposed adjacent to the motor housing. The brushless motor and a control board are cooled by cooling air generated by a fun, thereby enhancing the cooling characteristics of the motor control circuit.Type: GrantFiled: December 18, 2014Date of Patent: April 14, 2020Assignee: KOKI HOLDINGS CO., LTD.Inventors: Hideyuki Hashimoto, Atsuyuki Kikuchi, Shingo Yamazaki, Kuniaki Kanbe, Satoshi Abe, Daijiro Tanabe, Takehiro Ookubo
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Publication number: 20180015603Abstract: An impact tool in which stop control of a motor as power source of a tool bit is changed in accordance with a predetermined condition is provided. A hammer drill having two or more operating modes including a hammer mode in which an impact force is transmitted to a tool bit whereas a rotational force s not transmitted thereto and a hammer drill mode in which at least the rotational force is transmitted to the tool bit includes a motor as a power source and a control part that performs stop control to stop the motor, and the control part performs any one of two or more of the stop controls in accordance with a predetermined condition.Type: ApplicationFiled: January 8, 2016Publication date: January 18, 2018Inventors: Satoshi ABE, Kuniaki KANBE
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Publication number: 20170239804Abstract: Provided is an electric work machine that can suppress a temperature increase of a component controlling an electric motor. The electric work machine including a brushless motor that operates a tip tool includes a rectification circuit that converts a voltage to be applied to the brushless motor from an alternating current voltage to a direct current voltage, and a switching circuit that controls the brushless motor, and the rectification circuit is arranged upstream of the switching circuit in a circulation path of the air that cools the rectification circuit and the switching circuit.Type: ApplicationFiled: September 29, 2015Publication date: August 24, 2017Inventors: Akira MATSUSHITA, Tomomasa NISHIKAWA, Yuta NOGUCHI, Kuniaki KANBE, Shingo YAMAZAKI
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Publication number: 20170043466Abstract: The disclosure provides a work tool having an electric motor, a power transmission means that receives motive power from the electric motor and transmits the motive power to a tip tool, a gear housing for accommodating at least a portion of the power transmission means, weights swingably supported on the gear housing, and coil springs that function as an urging means for urging the weights such that the weights are located at an initial neutral position, wherein the weights and the coil springs are provided respectively on the two sides of the gear housing so as to put the power transmission means therebetween, and a rotational support axle is provided that functions as a connecting means for connecting the weights provided on both sides of the gear housing so as to connect the weights such that the weights swing integrally.Type: ApplicationFiled: April 30, 2015Publication date: February 16, 2017Applicant: HITACHI KOKI CO., LTD.Inventors: Daijiro TANABE, Goya FUJIMOTO, Ryusuke KOBAYASHI, Kuniaki KANBE, Shinichirou SATOU
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Publication number: 20160229045Abstract: An electric power tool has a brushless motor for driving a tip tool, and a motor case is at least partly covered by a motor housing made of aluminum alloy and exposed to an outside. A control board provided with a control circuit for controlling the rotation of the brushless motor is disposed adjacent to the motor housing. The brushless motor and a control board are cooled by cooling air generated by a fun, thereby enhancing the cooling characteristics of the motor control circuit.Type: ApplicationFiled: December 18, 2014Publication date: August 11, 2016Inventors: Hideyuki HASHIMOTO, Atsuyuki KIKUCHI, Shingo YAMAZAKI, Kuniaki KANBE, Satoshi ABE, Daijiro TANABE, Takehiro OOKUBO
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Patent number: 8261854Abstract: A reciprocating tool (1) includes a housing (20, 30), a driving source (21), a reciprocation conversion unit (34, 36), —and a vibration reduction mechanism (30). The driving source is accommodated in the” housing. The reciprocation conversion unit (34, 36) is supported by the housing and is configured to convert a driving force of the driving source into a reciprocating motion for providing a tool bit (16) movably supported to the housing with a reciprocating motion. The vibration reduction mechanism (70) includes a shaft (72), a weight (71), a support member (73), and a urging portion (74). The shaft i(72)s supported by the housing and extending in a direction perpendicular to directions of the reciprocating motion of the tool bit (41) t and has an axis. The weight (71) is located away from the shaft (72) and is swingable in a swinging direction. The support member (73) swingably supports the weight (71) about the axis of the shaft (72).Type: GrantFiled: April 30, 2008Date of Patent: September 11, 2012Assignee: Hitachi Koki Co., LtdInventors: Atsuyuki Kikuchi, Tsukasa Suzuura, Hiroshi Haga, Kuniaki Kanbe, Tomoya Ikeda
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Publication number: 20100038105Abstract: A reciprocating tool (1) includes a housing (20, 30), a driving source (21), a reciprocation conversion unit (34, 36), —and a vibration reduction mechanism (30). The driving source is accommodated in the” housing. The reciprocation conversion unit (34, 36) is supported by the housing and is configured to convert a driving force of the driving source into a reciprocating motion for providing a tool bit (16) movably supported to the housing with a reciprocating motion. The vibration reduction mechanism (70) includes a shaft (72), a weight (71), a support member (73), and a urging portion (74). The shaft i(72)s supported by the housing and extending in a direction perpendicular to directions of the reciprocating motion of the tool bit (41) t and has an axis. The weight (71) is located away from the shaft (72) and is swingable in a swinging direction. The support member (73) swingably supports the weight (71) about the axis of the shaft (72).Type: ApplicationFiled: April 30, 2008Publication date: February 18, 2010Applicant: Hitachi Koki Co., LtdInventors: Atsuyuki Kikuchi, Tsukasa Suzuura, Hiroshi Haga, Kuniaki Kanbe, Tomoya Ikeda