Patents by Inventor Tatsuo Nakashima

Tatsuo Nakashima 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: 11073203
    Abstract: A spindle is radially and axially compact. An impact wrench includes a motor, a sun gear rotatable by the motor, a planetary gear meshing with the sun gear, an internal gear meshing with the planetary gear, a gear case holding the internal gear, a spindle holding the planetary gear, and a first bearing located between the gear case and the spindle, and supporting the spindle on an outer circumference and the gear case on an inner circumference.
    Type: Grant
    Filed: December 5, 2019
    Date of Patent: July 27, 2021
    Assignee: MAKITA CORPORATION
    Inventor: Tatsuo Nakashima
  • Patent number: 10913174
    Abstract: A controller 50 is disposed to the front relative to a rotation shaft 11d of an electric motor 11 above a base 2, so as to be tilted in the up-to-down direction as it extends frontward.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: February 9, 2021
    Assignee: MAKITA CORPORATION
    Inventor: Tatsuo Nakashima
  • Publication number: 20210016428
    Abstract: A power tool (1), such as an impact wrench (1), includes: a brushless motor (8); a motor housing (7), which houses the brushless motor (8); an anvil (4), which is rotationally driven by the brushless motor (8) and disposed forward of the brushless motor (8); a handle (3), which is disposed downward of the motor housing (7); a battery-mount part (5), which is disposed downward of the handle (3); a battery pack (6), which is mounted on the battery-mount part (5) by being slid relative to the battery-holding housing (5); and a controller (70) for controlling the brushless motor (8). A switch panel (73) having at least one manipulatable button (73c) and at least one display part is provided downward of the handle (3) and is tilted such that the switch panel (73) is higher in the front.
    Type: Application
    Filed: July 16, 2020
    Publication date: January 21, 2021
    Inventor: Tatsuo NAKASHIMA
  • Publication number: 20210001418
    Abstract: A suspending member, such as a tether strap or the like, may by connected to improve convenience for an operator. The function of the suspending member shall be reliably performed by clearly notifying the user when the connecting part for connecting the suspending member is damaged. A ring-shaped notification member is incorporated in a connecting part for connecting the suspending member. The suspending member is inserted into both of a connecting hole in a connecting part and a notification member so as to be connected. When an end of a handle portion breaks due to long-term use, the notification member is pulled out such that the damage of the connecting part is notified.
    Type: Application
    Filed: February 19, 2019
    Publication date: January 7, 2021
    Applicant: MAKITA CORPORATION
    Inventors: Tatsuo NAKASHIMA, Kenji NOSE, Takuji KIMURA
  • Patent number: 10722960
    Abstract: A dust collection nozzle extends from the front of a fixing cover parallel to a base below an upper end of an electric motor. Heavy and large cutting dust can be immediately collected from an area relatively close to a cutting position of a portable cutting device cutting a workpiece immediately after dust is generated due to the cutting, which can in turn improve dust collection efficiency of a dust collection device to which the dust collection nozzle is attached.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: July 28, 2020
    Assignee: MAKITA CORPORATION
    Inventors: Sho Kume, Hirotomo Inayoshi, Tatsuo Nakashima, Tsutomu Naito, Kenji Nose
  • Publication number: 20200215678
    Abstract: The durability of a reduction mechanism is improved. An impact wrench includes a brushless motor, a sun gear rotatable by the brushless motor, a planetary gear meshing with the sun gear, an internal gear meshing with the planetary gear and having a first recess on an outer circumference, a gear case holding the internal gear and having a second recess on an inner circumference, a spindle holding the planetary gear, and a pin disposed in the first recess and in the second recess.
    Type: Application
    Filed: December 6, 2019
    Publication date: July 9, 2020
    Applicant: MAKITA CORPORATION
    Inventor: Tatsuo NAKASHIMA
  • Publication number: 20200217412
    Abstract: A spindle is radially and axially compact. An impact wrench includes a motor, a sun gear rotatable by the motor, a planetary gear meshing with the sun gear, an internal gear meshing with the planetary gear, a gear case holding the internal gear, a spindle holding the planetary gear, and a first bearing located between the gear case and the spindle, and supporting the spindle on an outer circumference and the gear case on an inner circumference.
    Type: Application
    Filed: December 5, 2019
    Publication date: July 9, 2020
    Applicant: MAKITA CORPORATION
    Inventor: Tatsuo NAKASHIMA
  • Patent number: 10486251
    Abstract: A pressing member is rotatably supported by a fixing screw shaft via a ball bearing. The pressing member is made of synthetic resin and is larger in diameter compared to that of the fixing screw shaft. A connection bar is pressed by the pressing member by fastening the fixing screw shaft, and the position of the connection bar is thereby fixed. Because the pressing member has a large diameter, a dent is not generated on the connection bar. Furthermore, because the pressing member is not rotated in the fixed position, the position of the connection bar is not offset, enhancing the ability of fixing the connection bar with precise adjustment.
    Type: Grant
    Filed: April 13, 2017
    Date of Patent: November 26, 2019
    Assignee: MAKITA CORPORATION
    Inventor: Tatsuo Nakashima
  • Publication number: 20190143555
    Abstract: A controller 50 is disposed to the front relative to a rotation shaft 11d of an electric motor 11 above a base 2, so as to be tilted in the up-to-down direction as it extends frontward.
    Type: Application
    Filed: October 31, 2018
    Publication date: May 16, 2019
    Applicant: MAKITA CORPORATION
    Inventor: Tatsuo NAKASHIMA
  • Publication number: 20180236574
    Abstract: A dust collection nozzle 60 extends from the front of a fixing cover 14 parallel to a base 2 below an upper end of an electric motor 25. Heavy and large cutting dust can be immediately collected from an area relatively close to a cutting position C of a portable cutting device 1 cutting a workpiece W immediately after dust is generated due to the cutting, which can in turn improve dust collection efficiency of a dust collection device to which the dust collection nozzle 60 is attached.
    Type: Application
    Filed: February 20, 2018
    Publication date: August 23, 2018
    Applicant: MAKITA CORPORATION
    Inventors: Sho KUME, Hirotomo INAYOSHI, Tatsuo NAKASHIMA, Tsutomu NAITO, Kenji NOSE
  • Patent number: 10011035
    Abstract: A machining device includes a rotary cutting tool, and an electric motor as a drive source for rotating the rotary cutting tool. A motor housing of the electric motor is connected to a stationary cover covering the rotary cutting tool. The electric motor is an outer rotor type electric motor includes a stator situated inside of a rotor. A rotor is supported by a motor shaft at a position of output side in the motor axis direction with respect to the stator. The rotor is mounted to the rotor base and is rotatably supported on the stationary cover. The stator is fixed to the motor housing so as to be immovable in the motor axis direction, and is arranged inside of the rotor.
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: July 3, 2018
    Assignee: MAKITA CORPORATION
    Inventor: Tatsuo Nakashima
  • Publication number: 20170326660
    Abstract: A pressing member is rotatably supported by a fixing screw shaft via a ball bearing. The pressing member is made of synthetic resin and is larger in diameter compared to that of the fixing screw shaft. A connection bar is pressed by the pressing member by fastening the fixing screw shaft, and the position of the connection bar is thereby fixed. Because the pressing member has a large diameter, a dent is not generated on the connection bar. Furthermore, because the pressing member is not rotated in the fixed position, the position of the connection bar is not offset, enhancing the ability of fixing the connection bar with precise adjustment.
    Type: Application
    Filed: April 13, 2017
    Publication date: November 16, 2017
    Applicant: MAKITA CORPORATION
    Inventor: Tatsuo NAKASHIMA
  • Publication number: 20160248295
    Abstract: A machining device includes a rotary cutting tool, and an electric motor as a drive source for rotating the rotary cutting tool. A motor housing of the electric motor is connected to a stationary cover covering the rotary cutting tool. The electric motor is an outer rotor type electric motor includes a stator situated inside of a rotor. A rotor is supported by a motor shaft at a position of output side in the motor axis direction with respect to the stator. The rotor is mounted to the rotor base and is rotatably supported on the stationary cover. The stator is fixed to the motor housing so as to be immovable in the motor axis direction, and is arranged inside of the rotor.
    Type: Application
    Filed: February 4, 2016
    Publication date: August 25, 2016
    Applicant: MAKITA CORPORATION
    Inventor: Tatsuo NAKASHIMA
  • Patent number: 9314913
    Abstract: In a dust collection device that collects dust particles that an impact tool generates, disclosed is a feature that can accommodate the lengths of tool bits that are mounted to the impact tool when a machining operation is executed by exchanging tool bits of different lengths. The dust collection device collects dust that the impact tool generates and is attached to said impact tool that, in the lengthwise direction, linearly operates the tool bit mounted to the end region of a tool body. The dust collection device has a dust intake port that sucks dust, and said dust intake port can be repositioned in the lengthwise direction of the tool bit in accordance with the length in the lengthwise direction of said tool bit.
    Type: Grant
    Filed: July 4, 2011
    Date of Patent: April 19, 2016
    Assignee: MAKITA CORPORATION
    Inventors: Hiroki Ikuta, Ken Yamauchi, Takamasa Hanai, Yoshitaka Machida, Masanori Higashi, Tatsuo Nakashima, Yoshinori Sasaki
  • Publication number: 20150266201
    Abstract: A portable cutting device may include a device body, a base and a hook. The device body may include a rotary cutter, a motor, a reduction mechanism coupled to the motor for rotating the rotary cutter, an accommodation portion for accommodating the reduction mechanism, and a fixed cover for covering the rotary cutter. The reduction mechanism may include an output shaft. The fixed cover may include a wall portion extending in a direction that is not parallel to the axial direction of the output shaft. The base may have an upper surface and a lower surface and may support the device body on an upper side of the upper surface. The hook may be attached to the wall portion of the fixed cover.
    Type: Application
    Filed: March 13, 2015
    Publication date: September 24, 2015
    Inventor: Tatsuo NAKASHIMA
  • Publication number: 20140020922
    Abstract: In a dust collection device that collects dust particles that an impact tool generates, disclosed is a feature that can accommodate the lengths of tool bits that are mounted to the impact tool when a machining operation is executed by exchanging tool bits of different lengths. The dust collection device collects dust that the impact tool generates and is attached to said impact tool that, in the lengthwise direction, linearly operates the tool bit mounted to the end region of a tool body. The dust collection device has a dust intake port that sucks dust, and said dust intake port can be repositioned in the lengthwise direction of the tool bit in accordance with the length in the lengthwise direction of said tool bit.
    Type: Application
    Filed: July 4, 2011
    Publication date: January 23, 2014
    Applicant: MAKITA CORPORATION
    Inventors: Hiroki Ikuta, Ken Yamauchi, Takamasa Hanai, Yoshitaka Machida, Masanori Higashi, Tatsuo Nakashima, Yoshinori Sasaki
  • Publication number: 20100116112
    Abstract: It is an object of the invention to improve a precision of cutting operation for a cutting machine. Representative cutting machine includes a tool body with a blade and a base having an opening through which part of the blade protrudes downward. A blade cutting direction indicating member is provided on a front end of the base in a direction of movement of the base and can be adjusted in mounting position with respect to the base. The blade cutting direction indicating member also adapted as a blade positioning member for positioning the blade with respect to a cutting line marked on the workpiece.
    Type: Application
    Filed: November 5, 2009
    Publication date: May 13, 2010
    Applicant: MAKITA CORPORATION
    Inventors: Toru Fukuoka, Tatsuo Nakashima
  • Patent number: 6463864
    Abstract: A gasification and melting furnace for wastes has a vertically movable furnace center lance disposed along the axis of the furnace and adapted to blow off a combustion sustaining gas downward into the furnace. One or more stages of upper tuyeres are disposed so that the angle at which the combustion sustaining gas is blown off into the furnace is displaced from the furnace axis direction, and one or more stages of lower tuyeres projected into the furnace so as to blow off a combustion sustaining gas or both combustion sustaining gas and fuel toward the furnace axis. Formation of a low temperature region in the furnace are prevented and a fire spot is concentrated on the combustion of wastes. As a result, molten slag and various metals, as well as an energy gas, which are high in added value, can be recovered stably.
    Type: Grant
    Filed: July 25, 2001
    Date of Patent: October 15, 2002
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Takaiku Yamamoto, Hideyuki Yamaoka, Yoshinori Matsukura, Hirotaka Sato, Katsuya Isaka, Akio Mutsuta, Hiroaki Ishida, Hitoshi Matsubara, Tatsuo Nakashima, Takahiro Yano, Noboru Furukawa, Teruo Oowada
  • Patent number: D523718
    Type: Grant
    Filed: August 3, 2004
    Date of Patent: June 27, 2006
    Assignee: Makita Corporation
    Inventors: Yuji Yamamoto, Tomonobu Nashimoto, Tatsuo Nakashima, Toru Fukuoka
  • Patent number: D936441
    Type: Grant
    Filed: May 19, 2020
    Date of Patent: November 23, 2021
    Assignee: MAKITA CORPORATION
    Inventors: Wataru Suzuki, Tatsuo Nakashima