Patents Assigned to KOKI HOLDINGS CO., LTD.
  • Publication number: 20210229249
    Abstract: A driving tool includes a housing having a support shaft for operably supporting an operating member, a contacting member which is capable of contacting and separating from a workpiece into which a fastener is to be driven, and which operates by contacting the workpiece, a pressure chamber to which and from which a compressible gas is supplied and discharged, a striking part operating in a direction to strike the fastener, a gas supply mechanism, and a transmission control member for controlling the operation of the gas supply mechanism, said operation being based on the operation of at least one of the operating member and the contacting member or the operation of both of them, wherein the fastener is struck when an operating force is applied to the operating member and to the transmission control member, and the contacting member is operated.
    Type: Application
    Filed: May 17, 2019
    Publication date: July 29, 2021
    Applicant: Koki Holdings Co., Ltd.
    Inventors: Kazuhiro OOTSUKA, Takuya KONNAI
  • Publication number: 20210234225
    Abstract: Provided is a battery pack which is miniaturized by reducing the number of components of a latch mechanism of the battery pack. In the battery pack comprising housings that accommodate a plurality of battery cells, and detachable latches, the latches have manipulation parts that are manipulated by an operator, springs that bias the manipulation parts to the outside of the housings, and first abutting parts on which ends of the springs abut. The manipulation parts move horizontally below the upper wall of the housing, and portions thereof are exposed to the outside from through holes formed in the housing. Furthermore, the latches are supported from below by any one among a separator holding the battery cell, a circuit board, and a lower case.
    Type: Application
    Filed: September 20, 2019
    Publication date: July 29, 2021
    Applicant: Koki Holdings Co., Ltd.
    Inventor: Yuuki TAKEDA
  • Publication number: 20210234438
    Abstract: The purpose of the invention is to achieve a miniaturized power tool. Provided is a hammer drill (1A) that includes: a brushless motor (10) that is a drive source for a tip tool (20); a control unit for controlling the driving of the brushless motor (10); a motor housing (33) to which the brushless motor (10) is attached; and a handle housing (34) provided with a grip (2). The control unit includes: a switching board (12) and a Hall element board (13), and a converter board (11) on which an electrolytic capacitor (11a) is installed. The brushless motor (10) is disposed to be sandwiched between the electrolytic capacitor (11a), and the switching board (12) and the Hall element board (13), along the axial direction (M) of a drive shaft (16) that drives the tip tool (20).
    Type: Application
    Filed: March 29, 2019
    Publication date: July 29, 2021
    Applicant: Koki Holdings Co., Ltd.
    Inventors: Yuta NOGUCHI, Hideyuki HASHIMOTO, Yuki TAKAHASHI
  • Patent number: 11059156
    Abstract: An impact tool that realizes an ON-lock function with a simple mechanism and makes it possible to switch between activation and deactivation of the ON-lock function with few operation processes is provided. A hammer drill having at least two operating modes including a hammer mode in which an impact force is transmitted to a tool bit whereas a rotational force is not transmitted thereto includes: a motor as a power source; a trigger lever and an ON-lock button that are operated by an operator; a sensor that detects whether a selected operating mode is the hammer mode or not; and a controller that controls the motor based on an operation of the trigger lever and the ON-lock button. When the ON-lock button is operated while the hammer mode is selected, the controller performs ON-lock control to maintain the motor in the operating state even when the trigger lever is not operated.
    Type: Grant
    Filed: January 8, 2016
    Date of Patent: July 13, 2021
    Assignee: KOKI HOLDINGS CO., LTD.
    Inventors: Satoshi Abe, Takahiro Ookubo, Hideyuki Hashimoto
  • Publication number: 20210205974
    Abstract: A drilling tool includes: a drive source; a bit attachment portion to which an end bit is attachable; a power transmission portion configured to apply a motive force to the end bit attached to the bit attachment portion; an operation portion switchable between an ON-state and an OFF-state by a manual operation and configured to receive a setting operation for setting a stop condition; and a controller configured to set the stop condition based on the setting operation, and to start driving of the drive source in response to a first switching operation for switching the operation portion from the OFF-state to the ON-state. In a state where the stop condition is set, even when the operation portion is in the ON-state, the controller stops driving of the drive source in response to the stop condition being met while the drive source is being driven.
    Type: Application
    Filed: April 26, 2019
    Publication date: July 8, 2021
    Applicant: KOKI HOLDINGS CO., LTD.
    Inventors: Hideyuki HASHIMOTO, Yuki TAKAHASHI, Hironori MASHIKO, Yuta NOGUCHI
  • Publication number: 20210210793
    Abstract: The present invention maintains compatibility with a power tool having no wireless connection function, and prevents malfunctions due to linked operation. A battery pack that supplies a driving power source to a power tool, said battery pack comprising: a wireless communication unit for communicating wirelessly with an external device; and a control unit that performs a first determination process to determine the state of a wireless communication connection with the external device, wherein when the control unit has determined in the first determination process that wireless communication has been established, the control unit transmits a linking command to the external device, and during a state in which the wireless communication has been established, the control unit can perform a communication connection cancellation process to cancel the wireless communication.
    Type: Application
    Filed: May 29, 2019
    Publication date: July 8, 2021
    Applicant: Koki Holdings Co., Ltd.
    Inventors: Satoshi YAMAGUCHI, Hiroyuki HANAWA, Tatsuya ITO, Kenta HARADA, Hiromi TAKAHASHI
  • Patent number: 11052530
    Abstract: 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: Grant
    Filed: September 29, 2015
    Date of Patent: July 6, 2021
    Assignee: KOKI HOLDINGS CO., LTD.
    Inventors: Akira Matsushita, Tomomasa Nishikawa, Yuta Noguchi, Kuniaki Kanbe, Shingo Yamazaki
  • Publication number: 20210197350
    Abstract: A driver has: a strike section moving in a first direction to strike a fastener; and a bumper contacting the strike section and restricting the range of movement of the strike section in the first direction. The driver further has: a support section for supporting the bumper; a connection section connected to the support section and disposed in a direction intersecting the first direction; a drive section supported by the connection section and moving the strike section in a second direction; a first receiving section which, when the strike section moves in the first direction to hit the bumper, receives a load acting on the support section in the first direction; and a second receiving section which, when the strike section moves in the first direction to hit the bumper, receives a load acting on the support section in the circumferential direction about a first centerline of the drive section.
    Type: Application
    Filed: October 27, 2017
    Publication date: July 1, 2021
    Applicant: Koki Holdings Co., Ltd.
    Inventors: Mayumi UMINO, Sotaro AIZAWA, Takashi UEDA
  • Publication number: 20210187722
    Abstract: There is provided a power tool in which impact applied to a power transmission portion can be mitigated to thereby suppress components constituting the power transmission portion from being deformed and damaged. The power tool includes a brushless motor 3 having a rotation shaft portion 31 rotatable about a rotation axis A1, a housing 2 accommodating therein the brushless motor 3, a power transmission portion 6 configured to receive a rotation force of the rotation shaft portion 31 and to transmit a driving force based on the rotation force, and a driven portion 7 configured to be driven by receiving the transmitted driving force. The rotation shaft portion 31 is supported by the housing 2 so as to be movable relative to the housing 2 in an axial direction of the rotation axis A1.
    Type: Application
    Filed: November 30, 2018
    Publication date: June 24, 2021
    Applicant: KOKI HOLDINGS CO., LTD.
    Inventors: Yasutaka SHIMIZU, Yoshikazu YOKOYAMA, Naoki TADOKORO, Ryosuke NAKANO
  • Patent number: 11020846
    Abstract: Provided is a work tool that can work suitably in cooperation with an attachment device connected to a main body of the work tool to enhance work efficiency. The work tool includes a main body 2, and a control circuit 71 configured to provide control over the main body 2. The main body 2 includes a motor 3, an end-bit mount portion 10 and an end bit 14 as a work part configured to be driven by the motor 3 to perform a work. A dust collector 100 is connectable to the main body 2 to assist the work. The control circuit 71 is configured to detect whether the dust collector 100 is connected to the main body 2 and change the control over the main body 2 based on whether the connection is established or not.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: June 1, 2021
    Assignee: Koki Holdings Co., Ltd.
    Inventors: Yoshikazu Kawano, Tomoaki Sudo, Kenichi Takaada, Shinichi Sakuma
  • Publication number: 20210154822
    Abstract: The electric tool including a motor having a stator and a rotor, a rotation shaft integrally rotating with the rotor, a casing accommodating the motor, a ventilating window disposed in the casing, a cooling fan sucking an air through the ventilating window to cool off the motor, a magnetic body disposed to the rotation shaft, a magnetic detection unit detecting a rotational position of the magnetic body, and a circuit substrate on which the magnetic detection unit is mounted. The circuit substrate and the magnetic body are disposed to be isolated from a wind path of a cooling wind generated by rotation of the cooling fan.
    Type: Application
    Filed: February 8, 2021
    Publication date: May 27, 2021
    Applicant: Koki Holdings Co., Ltd.
    Inventor: Yuuki TAKEDA
  • Publication number: 20210146517
    Abstract: The disclosure provides a driving tool. The driving tool includes an ejection part, a pressure accumulator, a striking part, a driving part, and a housing. The driving tool includes a cylinder forming at least a part of the pressure accumulator, and a piston formed in the striking part. The driving part and a wire material are entirely disposed outside, in the radial direction of the cylinder, a region in which the piston is arranged, and outside a region in which the piston slides in an operating direction of the striking part with respect to the cylinder.
    Type: Application
    Filed: March 29, 2019
    Publication date: May 20, 2021
    Applicant: Koki Holdings Co., Ltd.
    Inventors: Koji Shioya, Takashi Ueda
  • Patent number: 11007586
    Abstract: Provided is a portable cutter wherein the entire base has increased strength. This portable cutter is provided with: a body having a prime mover and a saw blade which is driven by the prime mover; a base having a through-hole through which the saw blade protrudes and sliding on a material to be cut; and a stand which rises from the base and to which the body is connected. If the direction in which cutting progresses is designated as a front-rear direction, a rib extending in the front-rear direction is provided to the base. The stand is configured such that, in the left-right direction, the stand is either located outside a region in which the through-hole is formed, or extended to the outside of the region. The positions, in the front-rear direction, of the stand and the rib partially overlap each other.
    Type: Grant
    Filed: November 22, 2017
    Date of Patent: May 18, 2021
    Assignee: Koki Holdings Co., Ltd.
    Inventor: Shinji Kuragano
  • Patent number: 10994393
    Abstract: To provide a rotary impact tool capable of: suppressing a rise in temperature in a motor or switching elements and a current flowing in the motor or switching elements while suppressing a degradation in tightening performance; and improving operability. The rotary impact tool includes: a motor; an end-bit holding part driven by the motor; an impact mechanism provided on a drive transmission path from the motor to the end-bit holding part and configured to intermittently produce rotary impacts, the rotary impacts transmitting a drive force of the motor to the end-bit holding part; a switching element configured to change a voltage supplied to the motor; and a control unit controlling the switching element. The control unit is configured such that the voltage supplied to the motor begins to gradually rise within a period of time from a timing when a first rotary impact ends to a timing when a second rotary impact subsequent to the first rotary impact starts.
    Type: Grant
    Filed: January 6, 2017
    Date of Patent: May 4, 2021
    Assignee: Koki Holdings Co., Ltd.
    Inventors: Tetsuhiro Harada, Tomomasa Nishikawa, Tatsuya Ito, Takahiro Hirai, Yang Li
  • Publication number: 20210122018
    Abstract: A driving tool capable of moving a striking unit in a direction of striking a fastener when electric power supply to a switching mechanism stops is provided. Further, a driving tool capable of setting a timing of generating a function of preventing moving force transfer from a contact member to a gas supply mechanism is provided. A driving tool including an operational member, a contact member, a pressure chamber, a striking unit and a driving unit has a first mode and a second mode that can be selected by an operator. When the second mode is selected, if a state with the operator operating the operational member and with the contact member being away from the workpiece is within predetermined time, movement of the contact member is not prevented. When the second mode is selected, if the state with the operator operating the operational member and with the contact member being away from the workpiece exceeds the predetermined time, the movement of the contact member is prevented.
    Type: Application
    Filed: February 22, 2019
    Publication date: April 29, 2021
    Applicant: Koki Holdings Co., Ltd.
    Inventors: Sotaro AIZAWA, Kazuhiro OOTSUKA
  • Patent number: 10991228
    Abstract: A technique capable of immediately reporting to an operator an occurrence of abnormality in an electric tool is provided. A communication terminal includes a communication-terminal-side control unit that determines whether abnormality has occurred in any of electric tools based on information acquired from the electric tools via wireless communication. When the communication-terminal-side control unit determines the occurrence of abnormality in any one of the electric tools, the occurrence of abnormality in the electric tool is reported by at least one of a report unit included in the electric tools other than the electric tool in which the occurrence of abnormality is determined and a report unit included in the communication terminal.
    Type: Grant
    Filed: April 15, 2019
    Date of Patent: April 27, 2021
    Assignee: KOKI HOLDINGS CO., LTD.
    Inventors: Tomomasa Nishikawa, Takuya Konnai, Tatsuya Ito
  • Publication number: 20210119566
    Abstract: Provided is an electric tool capable of continuing work by making the electrical advance angle of a brushless motor changeable even when a load is heavy. The electric tool is provided with: a brushless motor; a controller for controlling the drive of the brushless motor; and an inverter circuit supplied with a pulsation voltage obtained by rectifying an AC power supply input in a full-wave manner and electrifying the brushless motor 1 according to a control signal of the controller. The controller can change the electrical advance angle of the brushless motor. The controller detects the motor current flowing through the brushless motor and increases the electrical advance angle when the motor current reaches a predetermined threshold value.
    Type: Application
    Filed: March 30, 2018
    Publication date: April 22, 2021
    Applicant: Koki Holdings Co., Ltd.
    Inventors: Takeru KUMAKURA, Hideyuki TANIMOTO, Takuya YOSHINARI, Shinji KURAGANO
  • Patent number: 10967491
    Abstract: To provide a driver that can be reduced in the amount of gas to be injected into a pressure chamber. The driver has: an impactor configured to hit a stopper by moving from a first position toward a second position; a pressure chamber to be filled with gas for moving the impactor from the first position toward the second position; a control mechanism configured to move the impactor from the second position toward the first position; and a gas injection portion configured to inject gas into the pressure chamber, wherein the impactor is capable of taking a standby position between the second position and the first position, and the control mechanism is configured to stop the impactor at an adjustment position closer to the second position than the standby position before gas is injected into the pressure chamber.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: April 6, 2021
    Assignee: KOKI HOLDINGS CO., LTD.
    Inventors: Toshinori Yasutomi, Shinichirou Satou, Kazuhiko Funabashi, Yuki Mitoma
  • Publication number: 20210099052
    Abstract: Provided is an electrically powered tool having an improved sensor substrate mounting structure, the electrically powered tool being configured so that a brushless type motor is axially contained in a cylindrical housing. The electrically powered tool has: a cylindrical housing 100 for axially containing a motor; a control unit for controlling the motor; and a sensor substrate 11 having mounted thereon a plurality of position detecting elements for detecting the rotational position of a rotor. The sensor substrate is gripped between the insulator 6 of the motor and the housing 100 and held on the housing 100 side when axially mounting the motor. The sensor substrate 11 is annularly shaped and has formed at the center thereof a through-hole 12a through which a bearing for the motor is passed. The portion of the sensor substrate, on which a Hall IC is mounted, is provided with a synthetic resin cover member 14 for protecting the Hall IC against dust or the like.
    Type: Application
    Filed: March 30, 2018
    Publication date: April 1, 2021
    Applicant: Koki Holdings Co., Ltd.
    Inventors: Ryo Suzuki, Ken Miyazawa
  • Patent number: 10946506
    Abstract: There is provided a driving machine capable of reducing a load applied to a guide member in a direction of a center axis. The driving machine drives a fastener into a workpiece. The driving machine includes a movable piston, a driver blade operating together with the piston and applying driving force to the fastener, a cylinder guiding operation of the piston, a holder provided in a housing and supporting the cylinder, and a vibration damping rubber interposed between the holder and the housing and receiving a load applied to the holder in an operational direction of the piston.
    Type: Grant
    Filed: November 20, 2020
    Date of Patent: March 16, 2021
    Assignee: KOKI HOLDINGS CO., LTD.
    Inventor: Takashi Ueda