Patents by Inventor Naoki Tadokoro
Naoki Tadokoro 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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Publication number: 20150042246Abstract: An electric tool in which a pulsating input voltage is inputted to a drive circuit of a motor, characterized in that the electric tool includes: a control part configured to vary output power or output voltage supplied to the motor from the drive circuit in accordance with the pulsation of the input voltage inputted to the drive circuit.Type: ApplicationFiled: March 29, 2013Publication date: February 12, 2015Inventors: Naoki Tadokoro, Kazutaka Iwata
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Patent number: 8616190Abstract: A cutter for cutting a workpiece while using a water includes a housing, an electric motor disposed in the housing, a rotation shaft, a base, and a splashboard. The rotation shaft is supported by the housing for rotatably supporting an end tool driven by the electric motor. The base supports the housing, and has a top surface and a bottom surface to be in contact with the workpiece. The end tool has a part protrudable from the bottom surface. The splashboard section is positioned on the top surface and behind the end tool in a cutting direction. The splashboard section protrudes in a direction away from the top surface and extends in a direction substantially parallel to an axial direction of the rotation shaft.Type: GrantFiled: September 12, 2008Date of Patent: December 31, 2013Assignee: Hitachi Koki Co., Ltd.Inventors: Naoki Tadokoro, Toshihiko Tachibana
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Publication number: 20130260653Abstract: A first recess and protrusion engagement portion and a second recess and protrusion engagement portion making a fan guide and one end portion of a leg swingably abut on each other and making a base plate and the other end portion of the leg swingably abut on each other, respectively, and restricting a deviation of the leg relative to the fan guide and the base plate in a horizontal direction while allowing swinging of the leg relative to the fan guide and the base are provided between the fan guide and the one end portion and between the base plate and the other end portion, respectively. The leg can swing with almost no resistance without involving any elastic deformation during the orbital motion of the base, and stress to cause elastic deformation is not applied to the leg unlike the conventional art.Type: ApplicationFiled: February 15, 2013Publication date: October 3, 2013Applicant: HITACHI KOKI CO., LTD.Inventor: Naoki Tadokoro
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Publication number: 20130000934Abstract: A power tool includes a motor, an impact mechanism, an output unit, a circuit board, a housing, and a power cord. The circuit board includes a power-source circuit board configured to convert alternate current into direct current and a control circuit board. The housing includes a body section, a board accommodating section, and a handle section. The board accommodating section accommodates the circuit board. The handle section has one end portion connected to the body section and another end portion connected to the board accommodating section. The power cord extends from the board accommodating section. The power cord is positioned opposed to the handle section with respect to the board accommodating section. The control circuit board is located at a position close to the handle section in the board accommodating section. The power-source circuit board is located between the control circuit board and the power cord.Type: ApplicationFiled: December 27, 2011Publication date: January 3, 2013Applicant: Hitachi Koki Co., Ltd.Inventors: Naoki Tadokoro, Ken Miyazawa, Hajime Kikuchi, Toshiaki Koizumi
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Patent number: 8087556Abstract: An electric driver includes a hook portion which is constituted by a deformable hook-like portion and a connecting portion for connecting the hook-like portion to the handle. The hook-like portion is constituted by a base portion connected to the connecting portion and a bent portion continuous to the base portion, and a front end portion continuous to the bent portion and arranged at a position substantially opposed to the base portion. The front end portion and the base portion can be proximate to and remote from each other. The connecting portion holds the hook-like portion in a direction substantially the same as a direction in which the handle extends. The hook-like portion is pivotably held on a first rotating axis center extending in substantially the same direction as the handle.Type: GrantFiled: November 23, 2007Date of Patent: January 3, 2012Assignee: Hitachi Koki Co., Ltd.Inventors: Katsuhiro Oomori, Tomoyuki Hoshi, Hideki Ishida, Masato Sakai, Takuya Teranishi, Takeshi Taniguchi, Takuma Saito, Naoki Tadokoro, Hideyuki Hashimoto, Akira Oono
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Publication number: 20100147278Abstract: A cutter for cutting a workpiece while using a water includes a housing, an electric motor disposed in the housing, a rotation shaft, a base, and a splashboard. The rotation shaft is supported by the housing for rotatably supporting an end tool driven by the electric motor. The base supports the housing, and has a top surface and a bottom surface to be in contact with the workpiece. The end tool has a part protrudable from the bottom surface. The splashboard section is positioned on the top surface and behind the end tool in a cutting direction. The splashboard section protrudes in a direction away from the top surface and extends in a direction substantially parallel to an axial direction of the rotation shaft.Type: ApplicationFiled: September 12, 2008Publication date: June 17, 2010Applicant: Hitachi Koki Co., Ltd.Inventors: Naoki Tadokoro, Toshihiko Tachibana
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Patent number: 7719146Abstract: A power tool 1 includes a cylindrical-shaped yoke 31, magnets 32 provided in the interior of the yoke 31, an armature 41 disposed rotatably in the interior of the yoke 31, a cooling fan 7 rotatably secured to the armature 41, a fan guide 8 disposed on the periphery of the cooling fan 7, and a cylindrical-shaped housing 2 for storing the yoke 31 therein. The fan guide 8 is contacted with the axial-direction one end face of the yoke 31, and the fan guide 8 is engaged with the yoke 31 in the rotation direction thereof.Type: GrantFiled: January 9, 2007Date of Patent: May 18, 2010Assignee: Hitachi Koki Co., Ltd.Inventors: Shigeru Takahashi, Naoki Tadokoro, Takuma Saito
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Patent number: 7677752Abstract: A power tool includes a main housing, a motor, a hammer case, an end-tool holding part, a driving-force transmitting mechanism, a light-unit mounting part, a light unit, and a cover. The motor is accommodated in the main housing and is configured to generate a driving force. The hammer case has an outer peripheral surface. The end-tool holding part is configured to hold an end tool. The driving-force transmitting mechanism is accommodated in the hammer case. The driving-force transmitting mechanism is configured to transmit the driving force to the end-tool holding part. The light-unit mounting part is formed integrally with the hammer case. The light unit is mounted to the light-unit mounting part. The cover covers the outer peripheral surface of the hammer case and accommodates the light-unit mounting part and the light unit.Type: GrantFiled: July 25, 2007Date of Patent: March 16, 2010Assignee: Hitachi Koki Co., Ltd.Inventors: Naoki Tadokoro, Takuma Saito, Takuya Teranishi, Katsuhiro Oomori, Kazuhiko Funabashi
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Publication number: 20080185410Abstract: An electric driver includes a hook portion which is constituted by a hook-like portion and a connecting portion for connecting the hook-like portion to the handle. The hook-like portion is constituted by a base portion connected to the connecting portion and a bent portion continuous to the base portion and a front end portion continuous to the bent portion and arranged at a position substantially opposed to the base portion and can be deformed. The front end portion and the base portion can be proximate to and remote from each other. The connecting portion holds the hook-like portion in a state of being hung down in a direction substantially the same as a direction of extending the handle. The hook-like portion is held centering on a first rotating axis center extended in the direction of hanging down the hook-like portion pivotably relative to the handle.Type: ApplicationFiled: November 23, 2007Publication date: August 7, 2008Inventors: Katsuhiro OOMORI, Tomoyuki Hoshi, Hideki Ishida, Masato Sakai, Takuya Teranishi, Takeshi Taniguchi, Takuma Saito, Naoki Tadokoro, Hideyuki Hashimoto, Akira Oono
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Publication number: 20080135268Abstract: In order to prevent the grip portion of a power tool from heating up, a brake resistor in which a regenerative current generated by a motor flows is disposed in a tail portion of the handle. The brake resistor is composed of two resistor elements connected in parallel with each other. The two resistor elements are mounted on different surfaces of a circuit board to effectively utilize an interior space of the handle.Type: ApplicationFiled: November 16, 2007Publication date: June 12, 2008Inventors: Naoki TADOKORO, Takuya Teranishi
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Publication number: 20080025017Abstract: A power tool includes a main housing, a motor, a hammer case, an end-tool holding part, a driving-force transmitting mechanism, a light-unit mounting part, a light unit, and a cover. The motor is accommodated in the main housing and is configured to generate a driving force. The hammer case has an outer peripheral surface. The end-tool holding part is configured to hold an end tool. The driving-force transmitting mechanism is accommodated in the hammer case. The driving-force transmitting mechanism is configured to transmit the driving force to the end-tool holding part. The light-unit mounting part is formed integrally with the hammer case. The light unit is mounted to the light-unit mounting part. The cover covers the outer peripheral surface of the hammer case and accommodates the light-unit mounting part and the light unit.Type: ApplicationFiled: July 25, 2007Publication date: January 31, 2008Inventors: Naoki Tadokoro, Takuma Saito, Takuya Teranishi, Katsuhiro Oomori, Kazuhiko Funabashi
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Publication number: 20070182269Abstract: A power tool 1 includes a cylindrical-shaped yoke 31, magnets 32 provided in the interior of the yoke 31, an armature 41 disposed rotatably in the interior of the yoke 31, a cooling fan 7 rotatably secured to the armature 41, a fan guide 8 disposed on the periphery of the cooling fan 7, and a cylindrical-shaped housing 2 for storing the yoke 31 therein. The fan guide 8 is contacted with the axial-direction one end face of the yoke 31, and the fan guide 8 is engaged with the yoke 31 in the rotation direction thereof.Type: ApplicationFiled: January 9, 2007Publication date: August 9, 2007Inventors: Shigeru Takahashi, Naoki Tadokoro, Takuma Saito
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Patent number: D610421Type: GrantFiled: February 17, 2009Date of Patent: February 23, 2010Assignee: Hitachi Koki Co., Ltd.Inventors: Takeshi Taniguchi, Shinichi Kakefuda, Masanori Okada, Yoshiki Aoki, Junichi Toukairin, Takuya Teranishi, Naoki Tadokoro
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Patent number: D623496Type: GrantFiled: January 8, 2010Date of Patent: September 14, 2010Assignee: Hitachi Koki Co., Ltd.Inventors: Yoshiki Aoki, Hiroyuki Hasegawa, Naoki Tadokoro