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).

  • Patent number: 10547182
    Abstract: When a main switch (12) is turned ON, an electric operating machine (1) is put in the standby mode. With a trigger (13) being pulled in the standby mode, a power supply circuit (16) applies a voltage to a drive part (30). The power supply circuit (16) adjusts the voltage applied to the drive part (30) for a voltage corresponding to the pulling rate of the trigger (13). When the current running toward the drive part (30) exceeds the rated value of the drive part (30), the power supply circuit (16) automatically stops power supply to the drive part (30). On the other hand, when the output voltage of a battery (50) drops and the battery (50) is put in an overdischarge state, power supply to the drive part (30) is automatically stopped. When it is detected that the battery (50) undergoes an abnormal event, power supply to the drive part (30) is automatically stopped.
    Type: Grant
    Filed: February 10, 2017
    Date of Patent: January 28, 2020
    Assignee: KOKI HOLDINGS CO., LTD.
    Inventors: Nobuhiro Takano, Kazuhiko Funabashi, Hideyuki Tanimoto, Chikai Yoshimizu, Hiromi Ozawa, Yoshihiro Hoshi
  • Patent number: 10505473
    Abstract: 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: Grant
    Filed: March 25, 2015
    Date of Patent: December 10, 2019
    Assignee: KOKI HOLDINGS CO., LTD.
    Inventors: Nobuhiro Takano, Kazutaka Iwata, Toshiaki Koizumi, Naoki Tadokoro, Hiroshi Haga, Shinichirou Satou
  • Publication number: 20190259984
    Abstract: A battery pack houses first and second cell units that are composed of a plurality of cells, and has a positive electrode power source terminal and a negative electrode power source terminal. This battery pack is provided with a series connector capable of connecting, in series, the first and second cell units and a parallel connector capable of connecting, in parallel, the first and second cell units, and is capable of switching between a parallel connection voltage and a series connection voltage. In the case of attachment to the high voltage electrical device body, the series connector becomes conductive and the parallel connector pair is cut off by the action of the series/parallel switching terminal. In the case of attachment to a low voltage electrical device body, the state is returned to an initial state, the series connector is cut off, and the parallel connector pair becomes conductive.
    Type: Application
    Filed: October 27, 2017
    Publication date: August 22, 2019
    Applicant: Koki Holdings Co., Ltd.
    Inventors: Tomomasa NISHIKAWA, Takuya Teranishi, Naoto Wakatabe, Akira Matsushita, Masaru Hirano, Osamu Kawanobe, Nobuhiro TAKANO, Shinji Watanabe, Hiroyuki HANAWA, Takuhiro Murakami, SHOTA KANNO, Junpei Sato, Hikaru Tamura, Hayato Yamaguchi, Toshio Mizoguchi, Yasushi Nakano, Kazuhiko FUNABASHI, Masayuki Ogura, Yusuke FUNABIKI, Junichi Toukairin, Shota Takeuchi
  • Publication number: 20190260209
    Abstract: In order that the output voltage of a battery pack can be switched and the battery pack can be shared among different voltage electric appliances, this battery pack has a switching mechanism that switches outputting a low voltage by parallel connection of two cell units or outputting a high voltage by series connection of the two cell units, said two cell units each being composed of a plurality of cells connected in series, wherein the switching mechanism is configured from a change-over switch having an operation lever (452). The change-over switch is embedded in a battery pack (400), and an operator is able to manually switch outputting 18 V by setting the operation lever (452) at a first position or outputting 36 V by setting the operation lever (452) at a second position.
    Type: Application
    Filed: October 27, 2017
    Publication date: August 22, 2019
    Applicant: Koki Holdings Co., Ltd.
    Inventors: Tomomasa NISHIKAWA, Masayuki OGURA, Masaru HIRANO, Takuhiro MURAKAMI, Nobuhiro TAKANO, Osamu KAWANOBE, Akira MATSUSHITA, Hayato YAMAGUCHI
  • Publication number: 20190259985
    Abstract: In an upper cell unit (2146) and a lower cell unit (2147) comprising five battery cells, positive electrode terminals (2162, 2172) are set apart and aligned vertically, and negative electrode terminals (2167, 2177) are set apart and aligned vertically. When an electrical device body is rated at 36V, device-side terminals are in contact only at the upper terminals (2162, 2167), and short circuiting of the lower terminals (2172, 2177) is effected using a short bar 2059. When the electrical device body is rated at 18V, the upper and lower terminals (2162 and 2172, 2167 and 2177) are simultaneously made to contact the device-side terminals, and the upper cell unit (2146) and the lower cell unit (2147) assume a parallel connected state. Thus, it is possible to automatically switch the output voltage when a battery pack is mounted according to the difference in terminal shape on the electrical device body side.
    Type: Application
    Filed: October 27, 2017
    Publication date: August 22, 2019
    Applicant: Koki Holdings Co., Ltd.
    Inventors: Hiroyuki HANAWA, Tomomasa NISHIKAWA, SHOTA KANNO, Toshio Mizoguchi, Yasushi Nakano, Kazuhiko FUNABASHI, Takuya Teranishi, Naoto Wakatabe, Shinji Watanabe, Junpei Sato, Hikaru Tamura, Nobuhiro TAKANO, Osamu Kawanobe, Hayato Yamaguchi, Akira Matsushita, Masaru Hirano, Takuhiro Murakami, Masayuki Ogura, Yusuke Funabiki, Junichi Toukairin, Shota Takeuchi
  • Patent number: 10320214
    Abstract: 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: Grant
    Filed: August 29, 2013
    Date of Patent: June 11, 2019
    Assignee: Koki Holdings Co., Ltd.
    Inventors: Yuki Horie, Kazuhiko Funabashi, Nobuhiro Takano
  • Patent number: 10205198
    Abstract: A power tool includes a motor and control means for controlling the motor. The motor is capable of being driven by power supplied from a battery pack including a battery cell. The control means is configured to continue to rotate the motor even when a motor-halt signal is inputted from the battery pack. With this structure, the power tool can be used continuously without need to halt rotation of the motor, even when receiving a halt signal, such as an overdischarge detection signal or an overcurrent detection signal.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: February 12, 2019
    Assignee: Koki Holdings Co., Ltd.
    Inventors: Yoshikazu Kawano, Nobuhiro Takano, Toshiaki Koizumi, Kazuhiko Funabashi, Kenichirou Yoshida, Takao Aradachi
  • Patent number: 10183384
    Abstract: 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: Grant
    Filed: March 18, 2014
    Date of Patent: January 22, 2019
    Assignee: KOKI HOLDINGS CO., LTD.
    Inventors: Nobuhiro Takano, Kazutaka Iwata
  • Patent number: 10171011
    Abstract: 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: Grant
    Filed: April 25, 2014
    Date of Patent: January 1, 2019
    Assignee: KOKI HOLDINGS CO., LTD.
    Inventors: Nobuhiro Takano, Kazutaka Iwata
  • Patent number: 9893343
    Abstract: 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: Grant
    Filed: February 28, 2014
    Date of Patent: February 13, 2018
    Assignee: HITACHI KOKI CO., LTD.
    Inventor: Nobuhiro Takano
  • Publication number: 20170194670
    Abstract: A power tool includes a motor and control means for controlling the motor. The motor is capable of being driven by power supplied from a battery pack including a battery cell. The control means is configured to continue to rotate the motor even when a motor-halt signal is inputted from the battery pack. With this structure, the power tool can be used continuously without need to halt rotation of the motor, even when receiving a halt signal, such as an overdischarge detection signal or an overcurrent detection signal.
    Type: Application
    Filed: May 22, 2015
    Publication date: July 6, 2017
    Inventors: Yoshikazu KAWANO, Nobuhiro TAKANO, Toshiaki KOIZUMI, Kazuhiko FUNABASHI, Kenichirou YOSHIDA, Takao ARADACHI
  • Publication number: 20170155258
    Abstract: When a main switch (12) is turned ON, an electric operating machine (1)is put in the standby mode. With a trigger (13) being pulled in the standby mode, a power supply circuit (16) applies a voltage to a drive part (30). The power supply circuit (16) adjusts the voltage applied to the drive part (30) for a voltage corresponding to the pulling rate of the trigger (13). When the current running toward the drive part (30) exceeds the rated value of the drive part (30), the power supply circuit (16) automatically stops power supply to the drive part (30). On the other hand, when the output voltage of a battery (50) drops and the battery (50) is put in an overdischarge state, power supply to the drive part (30) is automatically stopped. When it is detected that the battery (50) undergoes an abnormal event, power supply to the drive part (30) is automatically stopped.
    Type: Application
    Filed: February 10, 2017
    Publication date: June 1, 2017
    Inventors: Nobuhiro TAKANO, Kazuhiko FUNABASHI, Hideyuki TANIMOTO, Chikai YOSHIMIZU, Hiromi OZAWA, Yoshihiro HOSHI
  • Publication number: 20170144278
    Abstract: In order to increase the screw tightening speed and improve the work efficiency, three first pawls 30e of a hammer 30 and three second pawls 18d of an anvil 18 are provided, so that a striking interval can be set to “interval of 120 degrees”, which is shorter than that of the related art. By setting total inertia obtained by sum of inertia of a rotor 12b and inertia of a spindle 26 to a low value which is “300 kg·mm2” or less when converted in terms of a rotation axis of the spindle 26, the rotor 12b and the spindle 26 can be sufficiently accelerated and the work efficiency can be improved.
    Type: Application
    Filed: June 19, 2015
    Publication date: May 25, 2017
    Applicants: HITACHI KOKI CO., LTD., HITACHI KOKI CO., LTD.
    Inventors: Tomomasa NISHIKAWA, Tetsuhiro HARADA, Nobuhiro TAKANO, Satoru MATSUNO
  • Publication number: 20170122304
    Abstract: A high-pressure washing machine is provided, which can stop a brushless motor even if the function of a microcomputer declines. The high-pressure washing machine is provided as a high-pressure washing machine 10 having a pump 12 which sucks and discharges a washing solution and a brushless motor 14 supplied with current to drive the pump 12. The high-pressure washing machine 10 includes an inverter circuit 29 which when the pump 12 driven by power from the brushless motor 14 discharges the washing solution, controls the rotation speed of the brushless motor 14, a driver circuit 30, a microcomputer 31, and a motor operation stopping circuit 37 which detects the discharge pressure of the pump 12 and which based on the result of the detection, switches on and off an electric circuit E1, which supplies current to the brushless motor 14.
    Type: Application
    Filed: June 10, 2015
    Publication date: May 4, 2017
    Inventors: Kazuhiko FUNABASHI, Nobuhiro TAKANO, Tomoaki SUDO
  • Patent number: 9616558
    Abstract: According to an aspect of the present invention, there is provided an impact tool including: a motor; a hammer connected to an output portion of the motor; and an anvil to be struck by the hammer in a rotation direction and having a rotary shaft, the hammer striking the anvil in the rotation direction by driving the motor in pulses, wherein the anvil is provided in front of the hammer, wherein the hammer is driven in pulses by the motor, and wherein a rotation angle of the hammer is substantially proportional to a rotation angle of the motor.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: April 11, 2017
    Assignee: HITACHI KOKI CO., LTD.
    Inventors: Tomomasa Nishikawa, Nobuhiro Takano, Hideyuki Tanimoto, Kazutaka Iwata, Hironori Mashiko, Hayato Yamaguchi, Atsushi Nakagawa, Katsuhiro Oomori, Mizuho Nakamura, Hiroki Uchida, Saroma Nakano, Chikai Yoshimizu
  • Publication number: 20170070168
    Abstract: 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: Application
    Filed: March 25, 2015
    Publication date: March 9, 2017
    Inventors: Nobuhiro Takano, Kazutaka Iwata, Toshiaki Koizumi, Naoki Tadokoro, Hiroshi Haga, Shinichirou Satou
  • Publication number: 20170012572
    Abstract: 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: Application
    Filed: January 23, 2015
    Publication date: January 12, 2017
    Inventors: Nobuhiro Takano, Yoshikazu Kawano, Toshiaki Koizumi, Hideyuki Tanimoto, Kazutaka Iwata, Shigeharu Ushiwata
  • Patent number: 9522461
    Abstract: 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: Grant
    Filed: June 30, 2011
    Date of Patent: December 20, 2016
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Katsuhiro Oomori, Mizuho Nakamura, Yutaka Ito, Nobuhiro Takano, Tomomasa Nishikawa, Hironori Mashiko, Shigeru Takahashi
  • Patent number: 9430485
    Abstract: 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: Grant
    Filed: November 6, 2013
    Date of Patent: August 30, 2016
    Assignee: FUJITSU LIMITED
    Inventors: Norihito Kato, Nobuhiro Takano, Norichika Imamura
  • Publication number: 20160207187
    Abstract: 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: Application
    Filed: July 25, 2014
    Publication date: July 21, 2016
    Inventors: Tomomasa Nishikawa, Chikai Yoshimizu, Nobuhiro Takano