Patents by Inventor Nobuhiro Takano
Nobuhiro Takano 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: 20170070168Abstract: An electric tool including a motor configured to be driven by a PWM control of a semiconductor switching element by using a power supply, a power transmission mechanism configured to transmit a rotation of the motor to an end tool, and a controller configured to control a rotation of the motor by a duty ratio of a PWM signal, wherein the controller is configured to set the duty ratio to a reference duty ratio less than 100% when a voltage of the power supply applied to the electric tool is within a predetermined range including a rated voltage of the electric tool, and wherein the controller is configured to drive the motor by setting the duty ratio to be higher than the reference duty ratio when the voltage of the power supply applied to the electric tool is lower than the predetermined range.Type: ApplicationFiled: March 25, 2015Publication date: March 9, 2017Inventors: Nobuhiro Takano, Kazutaka Iwata, Toshiaki Koizumi, Naoki Tadokoro, Hiroshi Haga, Shinichirou Satou
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Publication number: 20170012572Abstract: To provide a work tool capable of suppress temperature rise in a motor or a switching element. The work tool includes: a motor; a switching element switchable between an ON-state and an OFF-state, the switching element allowing a current to flow through the motor during the ON-state, the switching element prohibiting a current from flowing through the motor during the OFF-state; target rotation number setting means for setting a target rotation number of the motor; rotation number controlling means for controlling the motor such that the rotation number thereof is brought in coincidence with the target rotation number by changing an ON-duration, during which the switching element is in the ON-state, in one switching period of the switching element; and temperature detecting means for detecting at least one of a temperature of the motor and a temperature of the switching element.Type: ApplicationFiled: January 23, 2015Publication date: January 12, 2017Inventors: Nobuhiro Takano, Yoshikazu Kawano, Toshiaki Koizumi, Hideyuki Tanimoto, Kazutaka Iwata, Shigeharu Ushiwata
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Patent number: 9522461Abstract: An impact tool (1) includes a motor (3); a hammer (42) having a rotational axis extending in a first direction, the hammer (42) being rotatable in a rotational direction including a forward direction and a reverse direction opposite to the forward direction by the motor (3) and being movable in the first direction and a second direction opposite to the first direction; an anvil (52) disposed at the first direction side of the hammer (42) and strikable by the hammer (42) in the forward direction, the hammer (42) that has been struck the anvil (52) being moved in the second direction to come free from the anvil (52); and a fixing member (45A, 46A) that selectively allows the hammer (42) to move in the second direction or prevents the hammer (42) from moving in the second direction.Type: GrantFiled: June 30, 2011Date of Patent: December 20, 2016Assignee: Hitachi Koki Co., Ltd.Inventors: Katsuhiro Oomori, Mizuho Nakamura, Yutaka Ito, Nobuhiro Takano, Tomomasa Nishikawa, Hironori Mashiko, Shigeru Takahashi
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Patent number: 9430485Abstract: An information processor coupled to a storage apparatus that stores information, includes: a creation unit configured to create a snapshot of a file system that manages first information stored in the storage apparatus and to output the snapshot to the storage apparatus; a writing unit configured to write second information stored in cache memory onto the storage apparatus after the snapshot has been created; and a replication instruction unit configured to instruct the storage apparatus to create a replication of the first information stored in the storage apparatus after the second information has been written and the snapshot.Type: GrantFiled: November 6, 2013Date of Patent: August 30, 2016Assignee: FUJITSU LIMITEDInventors: Norihito Kato, Nobuhiro Takano, Norichika Imamura
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Publication number: 20160207187Abstract: A drilling device capable of easily pulling an end bit out of a workpiece is provided. The drilling device is provided with a housing, a brushless motor, a motion translating mechanism, and an output portion. The motion translating mechanism includes a rotation transmitting portion. The rotation transmitting portion includes a bevel gear and clutch. The bevel gear has an abutment portion. The clutches has an abutted portion. Rotational play is formed between the abutment portion and the abutted portion.Type: ApplicationFiled: July 25, 2014Publication date: July 21, 2016Inventors: Tomomasa Nishikawa, Chikai Yoshimizu, Nobuhiro Takano
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Publication number: 20160129576Abstract: An impact tool capable of improving durability of tool components and capable of reducing noise and vibration is provided. The impact tool includes a housing, a motor, a motion converting portion, an output portion, a power supply portion, a load detecting portion, and a control portion. The motor is disposed in the housing. The motion converting portion is configured to convert a rotating motion of the motor into a reciprocating motion. The output portion is configured to output the reciprocating motion of the motion converting portion as an impact force. The power supply portion is configured to supply a driving power to the motor. The load detecting portion is configured to detect a load imposed on the motor. The control portion is configured to control the power supply portion to increase the driving power supplied to the motor during a prescribed period when the load detected by the load detecting portion is larger than a prescribed value.Type: ApplicationFiled: April 25, 2014Publication date: May 12, 2016Inventors: Tomomasa Nishikawa, Nobuhiro Takano, Shinichirou Satou
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Patent number: 9337763Abstract: A power tool system includes: a power tool including an AC motor; a portable battery pack; and a power supply device that converts a DC power supplied from the portable battery pack into an AC power to supply the AC power to the AC motor.Type: GrantFiled: October 26, 2011Date of Patent: May 10, 2016Assignee: Hitachi Koki Co., Ltd.Inventors: Kazuhiko Funabashi, Nobuhiro Takano, Yoshikazu Kawano, Yasushi Nakano, Yuki Horie, Shinji Watanabe, Miyoji Onose, Haruhisa Fujisawa
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Patent number: 9314908Abstract: According to an aspect of the present invention, there is provided an impact tool including: a motor drivable in an intermittent driving mode; a hammer connected to the motor; an anvil to be struck by the hammer to thereby rotate/strike a tip tool; and a control unit that controls a rotation of the motor by switching a driving pulse supplied to the motor in accordance with a load applied onto the tip tool.Type: GrantFiled: July 29, 2010Date of Patent: April 19, 2016Assignee: HITACHI KOKI CO., LTD.Inventors: Hideyuki Tanimoto, Nobuhiro Takano, Tomomasa Nishikawa, Kazutaka Iwata, Hironori Mashiko, Hayato Yamaguchi, Atsushi Nakagawa, Katsuhiro Oomori, Mizuho Nakamura, Hiroki Uchida, Saroma Nakano, Yutaka Ito
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Publication number: 20160079887Abstract: An electric tool includes: a motor configured to be driven by PWM controlling a semiconductor switching element; a trigger configured to adjust startup and rotation of the motor; a changeover switch configured to switch a rotation direction of the motor between a forward rotation and a reverse rotation; a power transmission mechanism configured to rotate a tip tool by the motor, and a controller configured to control rotation of the motor. When the reverse rotation is set by the changeover switch, the controller PWM controls the semiconductor switching element at a high duty ratio after the trigger is pulled to drive the motor, and thereafter drives the motor at a state where the high duty ratio is changed to a low duty ratio.Type: ApplicationFiled: April 25, 2014Publication date: March 17, 2016Inventors: Nobuhiro Takano, Kazutaka Iwata
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Publication number: 20160049636Abstract: The present invention reduces or shuts off output electric power of a battery pack, which is connected to an electric device, depending on an abnormality. According to the present invention, a battery pack is detachably connected to an electric-device main body having a switch, and includes a first electric-power control circuit that outputs a first signal to the electric-device main body when the switch is operated, the first signal for allowing supply of electric power to the electric-device main body, a second switching element provided on an electric-power supply path that supplies electric power to the electric-device main body, and a second electric-power control circuit that outputs a second signal to the second switching element if an abnormality occurs in the battery pack, the second signal for reducing or shutting off the electric power supplied to the electric-device main body.Type: ApplicationFiled: February 28, 2014Publication date: February 18, 2016Inventor: Nobuhiro TAKANO
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Publication number: 20160008961Abstract: The purpose of the present invention is to use a motor with as high an output as possible to complete tightening operations at a high speed while limiting continuous drive output. In a power tool having a plurality of impact operation modes, the motor thereof is controlled at a 100% duty cycle so as to rotate at a high speed in the period between pulling of a trigger and starting of an impact operation (71a-71b), and the duty cycle is changed to a low duty cycle matching the appropriate operation mode after an impact by an impact mechanism is started and a predetermined stroke is performed so that the motor is driven at the low duty cycle until the trigger is returned (arrow 71c-71d). The switching of the duty cycle is performed when the current flowing to the motor exceeds a threshold (I1).Type: ApplicationFiled: March 18, 2014Publication date: January 14, 2016Inventors: Nobuhiro Takano, Kazutaka Iwata
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Publication number: 20150303842Abstract: An impact tool includes: a motor; a controller configured to control driving power supplied to the motor using a semiconductor switching element; and a striking mechanism configured to continuously or intermittently drive a tip tool using a rotational force of the motor. The controller drives the motor by changing a PWM driving signal for driving the semiconductor switching element to mix a high-duty strike based on control of a high duty ratio and a low-duty strike based on control of a low duty ratio in one operation until a trigger is released after the trigger is pulled.Type: ApplicationFiled: November 25, 2013Publication date: October 22, 2015Inventors: Nobuhiro TAKANO, Tomomasa NISHIKAWA, Kazutaka IWATA, Yoshihiro HOSHI
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Patent number: 9160211Abstract: An electric grasscutter includes a motor (50) which drives a rotary blade (42). The motor (50) is a brushless motor accommodated in a motor housing (51) and including a rotor (53) provided integrally with an output shaft (52), and a stator (54) fixed to the motor housing (51). A motor control circuit which drives the motor (50) is accommodated in the motor housing (51). The motor control circuit includes an inverter having FETs (81-86) as switching elements, and a control section to control the FETs (81-86). The FETs (81-86) are fixed in contact with the motor housing (51).Type: GrantFiled: September 22, 2010Date of Patent: October 13, 2015Assignee: HITACHI KOKI CO., LTD.Inventors: Hideyuki Tanimoto, Chikai Yoshimizu, Nobuhiro Takano, Hiromi Ozawa, Kazuhiko Funabashi
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Patent number: 9065155Abstract: When a battery pack having an output voltage of 14.4 V that is connectable to an electric tool in a sliding manner is used as a power supply source for the electric tool that is connectable to a battery pack in an insertion manner and has a rated voltage of 12 V, the electric tool and the battery pack are connected to each other with an adaptor interposed therebetween. The adaptor has an FET that is switched at a predetermined duty of a predetermined frequency. The battery pack and the electric tool are connected or disconnected to or from each other by the switching operation, thereby dropping the output voltage of the battery pack. When the detected voltage is out of a predetermined value range, it is judged that the overcurrent or overdischarge has occurred. Then, the FET is turned off to stop the electric tool.Type: GrantFiled: June 22, 2012Date of Patent: June 23, 2015Assignee: HITACHI KOKI CO., LTD.Inventors: Nobuhiro Takano, Yoshikazu Kawano, Kazuhiko Funabashi, Yuuichi Konuma, Masateru Niyada, Chikai Yoshimizu, Eiji Nakayama, Kenro Ishimaru
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Publication number: 20150171654Abstract: A power tool includes: a secondary battery; a drive unit; a detecting unit; and a control unit. The secondary battery has positive and negative terminals across which a battery voltage is developed. The drive unit is connected to the secondary battery. The detecting unit is configured to detect a current value and a voltage value supplied from the secondary battery to the drive unit. The control unit is configured to control an effective voltage and an effective current applied to the drive unit depending on a load imposed thereon to fall within an allowable power dissipation value.Type: ApplicationFiled: August 29, 2013Publication date: June 18, 2015Applicant: Hitachi Koki Co., Ltd.Inventors: Yuki Horie, Kazuhiko Funabashi, Nobuhiro Takano
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Patent number: 9048699Abstract: According to an aspect of the present invention, there is provided a power tool including: a brushless motor; switching elements that drive the brushless motor; a circuit board on which the switching elements are mounted; a transmission portion that transmits a driving force of the brushless motor; and a housing that houses the brushless motor, the switching elements, the circuit board and the transmission portion therein, wherein the switching elements include semiconductor elements each having terminals on a bottom surface thereof, and wherein the switching elements are surface mounted on the circuit board.Type: GrantFiled: May 20, 2009Date of Patent: June 2, 2015Assignee: HITACHI KOKI CO., LTD.Inventors: Katsuhiro Oomori, Junichi Toukairin, Nobuhiro Takano, Kazutaka Iwata, Tomomasa Nishikawa
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Patent number: 8988019Abstract: An electric operating machine comprising a motor and a power circuit driving the motor by the electric power supplied from a battery. The power circuit comprises a voltage conversion part converting an input voltage entered in accordance with a voltage of said battery to generate an output voltage and outputting said generated output voltage to said motor. The power circuit is structured so that the voltage value of said output voltage of said voltage conversion part is changeable.Type: GrantFiled: January 14, 2011Date of Patent: March 24, 2015Assignee: Hitachi Koki Co., Ltd.Inventors: Kazuhiko Funabashi, Nobuhiro Takano
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Publication number: 20150022125Abstract: An electric tool for driving a tip tool, the electric tool includes: a removable battery; the brushless motor configured to generate a driving force for driving the tip tool; an inverter circuit configured to supply drive power from the removable battery to the brushless motor using a plurality of semiconductor switching elements; a controller configured to control the inverter circuit to control rotation of the brushless motor; a temperature detector configured to detect a temperature of the brushless motor or the semiconductor switching elements; and a voltage detector configured to detect a voltage of the battery. The brushless motor is driven such that a duty ratio of PWM drive signal for driving the semiconductor switching elements is determined based on relationship between the temperature detected by the temperature detector and the voltage detected by the voltage detector.Type: ApplicationFiled: March 13, 2013Publication date: January 22, 2015Inventors: Nobuhiro Takano, Tetsuhiro Harada, Yoshio Iimura, Tomomasa Nishikawa, Hiroki Uchida, Yoshihiro Nakano
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Patent number: 8928201Abstract: A motor has an output shaft which is rotatably supported by a housing, a rotor which is fixed to the output shaft and which comprises a printed-wiring board, and a stator which is fixed to the housing and which comprises a magnet facing the rotor. The printed-wiring board comprises a coil/commutator disk and a coil disk. A commutator conductor pattern is formed in a commutator region of the coil/commutator disk. Likewise, coil conductor patterns are formed in respective coil regions of the coil/commutator disk and of the coil disk.Type: GrantFiled: September 22, 2010Date of Patent: January 6, 2015Assignee: Hitachi Koki Co., Ltd.Inventors: Hideyuki Tanimoto, Chikai Yoshimizu, Nobuhiro Takano, Hiromi Ozawa, Kazuhiko Funabashi
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Patent number: 8925645Abstract: An oil pulse tool includes a motor, an oil pulse unit, an output shaft on which a front end tool is attached, a torque detecting sensor for detecting generation of an impact torque, and an operating portion configured to detect a time period between a first impact torque detected by the torque detecting sensor and a second impact torque detected by the torque detecting sensor. The second impact torque is smaller than the first impact torque. The operating portion carries out a notification when the time period between the first impact torque and the second impact torque is less than a predetermined evaluation value for the time period between the first impact torque and the second impact torque.Type: GrantFiled: May 8, 2009Date of Patent: January 6, 2015Assignee: Hitachi Koki Co., Ltd.Inventors: Tetsuhiro Harada, Tomomasa Nishikawa, Kazutaka Iwata, Shinki Ohtsu, Nobuhiro Takano