Patents by Inventor Atsuyuki Kikuchi
Atsuyuki Kikuchi 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: 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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Patent number: 10569405Abstract: Provided is an impact tool which can perform control in accordance with working situations. The impact tool converts a torque of a brushless motor into a striking force and applies it to a tip tool. The impact tool includes: a motor control unit which makes detection about whether the tip tool is pressed against an object during the rotation of the brushless motor; and a motor control unit which performs speed increase control for increasing the rotational speed of the brushless motor when a state of pressing the tip tool against the object has been detected continuously for a predetermined time.Type: GrantFiled: September 29, 2015Date of Patent: February 25, 2020Assignee: KOKI HOLDINGS CO., LTD.Inventor: Atsuyuki Kikuchi
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Publication number: 20170246736Abstract: Provided is an impact tool which can perform control in accordance with working situations. The impact tool converts a torque of a brushless motor into a striking force and applies it to a tip tool. The impact tool includes: a motor control unit which makes detection about whether the tip tool is pressed against an object during the rotation of the brushless motor; and a motor control unit which performs speed increase control for increasing the rotational speed of the brushless motor when a state of pressing the tip tool against the object has been detected continuously for a predetermined time.Type: ApplicationFiled: September 29, 2015Publication date: August 31, 2017Applicant: HITACHI KOKI CO., LTD.Inventor: Atsuyuki KIKUCHI
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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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Patent number: 7836971Abstract: An elastic unit includes a transatory unit including a first elastic support member, a second elastic support member and not-shown four round bar-shaped elastic bodies made of rubber. A rotation urging unit is composed of a Neidhart spring including an outer frame, a shaft, a rotary member, and four rubber rods. The rotary member is in a state where it is rotated at 10° counterclockwise from an initial state. Therefore, the rubber rod deforms upon reception of rolling friction from the outer frame and the rotary member, and the rotation urging unit gives the handle portion the urging power by which the handle portion is rotated so that one end of the handle portion is spaced away from a gear housing 31 in the direction of the handle portion.Type: GrantFiled: June 15, 2007Date of Patent: November 23, 2010Assignee: Hitachi Koki Co., Ltd.Inventors: Atsuyuki Kikuchi, Tsukasa Suzuura
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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
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Patent number: 6938705Abstract: A projected portion provided at a cylinder and projected in a radius direction is formed at an end face thereof on a side of a tool holding portion, and a holding portion on one side of holding portions for holding an outer periphery of the cylinder by at least two portions remote from each other in an axial direction to position in the radius direction of the cylinder is configured by a guide face having an inner diameter of a dimension substantially the same as an outer diameter of the projected portion and extended over to a contact face brought into contact with the projected portion from an end face of a cylinder case on a side of the tool holding portion.Type: GrantFiled: December 17, 2004Date of Patent: September 6, 2005Assignee: Hitachi Koki Co., Ltd.Inventor: Atsuyuki Kikuchi
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Publication number: 20050145403Abstract: A projected portion provided at a cylinder and projected in a radius direction is formed at an end face thereof on a side of a tool holding portion, and a holding portion on one side of holding portions for holding an outer periphery of the cylinder by at least two portions remote from each other in an axial direction to position in the radius direction of the cylinder is configured by a guide face having an inner diameter of a dimension substantially the same as an outer diameter of the projected portion and extended over to a contact face brought into contact with the projected portion from an end face of a cylinder case on a side of the tool holding portion.Type: ApplicationFiled: December 17, 2004Publication date: July 7, 2005Applicant: HITACHI KOKI CO., LTD.Inventor: Atsuyuki Kikuchi
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Patent number: 6907942Abstract: In a percussion tool such as an electric hammer or a hammer drill in which the axial direction of a motor 8 is substantially perpendicular to that of a tool bit 1 attached to a tool holder 2, a motor housing 3 is made of a hard material such as aluminum, and a tail cover 4 is disposed on the lower end of the motor housing 3, projections 3a and 3b which project beyond the tail cover 4 are disposed.Type: GrantFiled: January 30, 2003Date of Patent: June 21, 2005Assignee: Hitachi Koki Co., Ltd.Inventors: Atsuyuki Kikuchi, Masato Sakai
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Publication number: 20030155142Abstract: In a percussion tool such as an electric hammer or a hammer drill in which the axial direction of a motor 8 is substantially perpendicular to that of a tool bit 1 attached to a tool holder 2, a motor housing 3 is made of a hard material such as aluminum, and a tail cover 4 is disposed on the lower end of the motor housing 3, projections 3a and 3b which project beyond the tail cover 4 are disposed.Type: ApplicationFiled: January 30, 2003Publication date: August 21, 2003Applicant: Hitachi Koki Co., Ltd.Inventors: Atsuyuki Kikuchi, Masato Sakai
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Patent number: 6155356Abstract: A hammer holder, provided between a retainer sleeve and a cylinder, slidably holds an intermediate member in an axial direction. A predetermined clearance is maintained between the hammer holder and the retainer sleeve. The hammer holder has a recessed portion which is engageable with a flange of the intermediate member so as to restrict the slide movement of the intermediate member. A cushioning member receives a percussion force when the flange is stopped by the recessed portion. The clearance restricts a compression amount of the cushioning member so that a predetermined life of the cushioning member is assured.Type: GrantFiled: October 25, 1999Date of Patent: December 5, 2000Assignee: Hitachi Koki Co., Ltd.Inventors: Atsuyuki Kikuchi, Sinki Ohtsu, Mutsuo Harada, Akihisa Yahagi
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Patent number: D520837Type: GrantFiled: May 27, 2005Date of Patent: May 16, 2006Assignee: Hitachi Koki Co., Ltd.Inventors: Hitoshi Tsuzuki, Masato Sakai, Takeshi Taniguchi, Atsuyuki Kikuchi
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Patent number: D477206Type: GrantFiled: August 19, 2002Date of Patent: July 15, 2003Assignee: Hitachi Koki Co., Ltd.Inventors: Masato Sakai, Akihisa Yahagi, Atsuyuki Kikuchi
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Patent number: D592028Type: GrantFiled: September 12, 2008Date of Patent: May 12, 2009Assignee: Hitachi Koki Co., Ltd.Inventors: Takeshi Taniguchi, Hitoshi Tsuzuki, Tomoyuki Kawahara, Shinichi Kakefuda, Atsuyuki Kikuchi, Shingo Yamazaki
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Patent number: D730139Type: GrantFiled: August 26, 2014Date of Patent: May 26, 2015Assignee: Hitachi Koki Co., Ltd.Inventors: Takeshi Taniguchi, Atsuyuki Kikuchi, Hiroyuki Hasegawa