Patents by Inventor Masatoshi NAKAHAMA

Masatoshi NAKAHAMA 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).

  • Publication number: 20220168867
    Abstract: A dust collecting attachment removably attachable to a power tool that includes a housing and a spindle: a covering part formed such that a drive axis of a spindle passes through the inside of a suction hole in the attached state of the power tool and at least partially covers a periphery of the tool mounting part; a discharging part connected to the covering part and configured to discharge dust from the inside of the covering part; and at least one elastically deformable engagement piece connected to the covering part and having a claw configured to engage with the housing at a predetermined position of the housing.
    Type: Application
    Filed: November 29, 2021
    Publication date: June 2, 2022
    Applicant: MAKITA CORPORATION
    Inventors: Shin NAKAMURA, Takafumi KOTSUJI, Masatoshi NAKAHAMA
  • Publication number: 20220134528
    Abstract: A power tool includes a motor, a spindle, an inner housing, an outer housing formed by an upper member and a lower member, a pair of interposing members and a pair of elastic members. The interposing members are arranged leftward and rightward of the inner housing, respectively, and fixedly connected to a first member, which is one of the upper member and the lower member, and at least partially in contact with an inner surface of the first member. The elastic members are held between a left portion of the inner housing and one of the interposing members and between a right portion of the inner housing and the other of the interposing members, respectively. A first end portion of each of the interposing members has at least one first surface extending to be closer to the inner housing toward a tip end of the first end portion.
    Type: Application
    Filed: October 28, 2021
    Publication date: May 5, 2022
    Applicant: MAKITA CORPORATION
    Inventors: Takafumi KOTSUJI, Shin NAKAMURA, Akira MIZUTANI, Masatoshi NAKAHAMA, Yoshihiro OZEKI
  • Patent number: 10821570
    Abstract: A grinder according to one aspect of the present disclosure includes a motor, a housing for housing the motor, a spindle protruding from the housing and configured to be driven to be rotated by the motor, a wheel cover configured to cover a part of a tip end tool attached to the spindle, a detector configured to detect the wheel cover, and a controller configured to stop or restrict the spindle being driven by the motor in response to non-detection of the wheel cover by the detector.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: November 3, 2020
    Assignee: MAKITA CORPORATION
    Inventors: Akira Tomonaga, Katsuhito Fujinami, Ryo Imuta, Masatoshi Nakahama, Akira Mizutani, Takahiro Kawakami, Hideharu Muto, Junya Ishikawa, Ken Goto
  • Patent number: 10811937
    Abstract: A power tool includes a brushless motor having a stator and a rotor, which includes a rotary shaft extending in a front-rear direction of the power tool. The rotary shaft rotates a spindle that extends in an up-down direction of the power tool. A fan is fixedly coupled to the rotary shaft and rotates therewith. A switch is disposed rearward of the brushless motor and a controller is disposed rearward of the switch in the front-rear direction. A battery pack is disposed rearward of the controller. A main-body housing houses the brushless motor, the switch and the controller. The main-body housing includes a first tubular part, which houses the brushless motor, and a second tubular part, which houses the switch. The diameter of the second tubular part is smaller than the diameter of the first tubular part.
    Type: Grant
    Filed: March 13, 2018
    Date of Patent: October 20, 2020
    Assignee: MAKITA CORPORATION
    Inventors: Takahiro Kawakami, Masatoshi Nakahama
  • Patent number: 10410811
    Abstract: A power tool (1) includes an electric motor (2) as a drive source and a start switch (20; 61) that starts the electric motor (2) and is lockable in an ON position in a lock-ON state. An electromagnetic actuator (30; 40; 50; 60) pushes out or pulls in an actuation pin (30a; 40a; 50a; 60a) with respect to a body of the electromagnetic actuator (30; 40; 50; 60) in response to cutting off of a supply of electrical current to the power tool (1). The pushed-out or pulled-in actuation pin, directly or indirectly, disengages the start switch (20; 61) from the lock-ON state and/or prevents the start switch (20; 61) from being shifted into the lock-ON state.
    Type: Grant
    Filed: September 14, 2016
    Date of Patent: September 10, 2019
    Assignee: MAKITA CORPORATION
    Inventors: Takamasa Hanai, Hikaru Sunabe, Satoshi Ninagawa, Shin Nakamura, Masatoshi Nakahama, Kazusa Fukuda, Kenichi Miyata
  • Publication number: 20180281146
    Abstract: A grinder according to one aspect of the present disclosure includes a motor, a housing for housing the motor, a spindle protruding from the housing and configured to be driven to be rotated by the motor, a wheel cover configured to cover a part of a tip end tool attached to the spindle, a detector configured to detect the wheel cover, and a controller configured to stop or restrict the spindle being driven by the motor in response to non-detection of the wheel cover by the detector.
    Type: Application
    Filed: September 23, 2016
    Publication date: October 4, 2018
    Applicant: MAKITA CORPORATION
    Inventors: Akira TOMONAGA, Katsuhito FUJINAMI, Ryo IMUTA, Masatoshi NAKAHAMA, Akira MIZUTANI, Takahiro KAWAKAMI, Hideharu MUTO, Junya ISHIKAWA, Ken GOTO
  • Publication number: 20180205293
    Abstract: A power tool includes a brushless motor having a stator and a rotor, which includes a rotary shaft extending in a front-rear direction of the power tool. The rotary shaft rotates a spindle that extends in an up-down direction of the power tool. A fan is fixedly coupled to the rotary shaft and rotates therewith. A switch is disposed rearward of the brushless motor and a controller is disposed rearward of the switch in the front-rear direction. A battery pack is disposed rearward of the controller. A main-body housing houses the brushless motor, the switch and the controller. The main-body housing includes a first tubular part, which houses the brushless motor, and a second tubular part, which houses the switch. The diameter of the second tubular part is smaller than the diameter of the first tubular part.
    Type: Application
    Filed: March 13, 2018
    Publication date: July 19, 2018
    Inventors: Takahiro KAWAKAMI, Masatoshi NAKAHAMA
  • Patent number: 9954418
    Abstract: A power tool includes a brushless motor having a stator and a rotor, which includes a rotary shaft extending in a front-rear direction of the power tool. The rotary shaft rotates a spindle that extends in an up-down direction of the power tool. A fan is fixedly coupled to the rotary shaft and rotates therewith. A switch is disposed rearward of the brushless motor and a controller is disposed rearward of the switch in the front-rear direction. A battery pack is disposed rearward of the controller. A main-body housing houses the brushless motor, the switch and the controller. The main-body housing includes a first tubular part, which houses the brushless motor, and a second tubular part, which houses the switch. The diameter of the second tubular part is smaller than the diameter of the first tubular part.
    Type: Grant
    Filed: February 25, 2015
    Date of Patent: April 24, 2018
    Assignee: MAKITA CORPORATION
    Inventors: Takahiro Kawakami, Masatoshi Nakahama
  • Publication number: 20170125192
    Abstract: A power tool (1) includes an electric motor (2) as a drive source and a start switch (20; 61) that starts the electric motor (2) and is lockable in an ON position in a lock-ON state. An electromagnetic actuator (30; 40; 50; 60) pushes out or pulls in an actuation pin (30a; 40a; 50a; 60a) with respect to a body of the electromagnetic actuator (30; 40; 50; 60) in response to cutting off of a supply of electrical current to the power tool (1). The pushed-out or pulled-in actuation pin, directly or indirectly, disengages the start switch (20; 61) from the lock-ON state and/or prevents the start switch (20; 61) from being shifted into the lock-ON state.
    Type: Application
    Filed: September 14, 2016
    Publication date: May 4, 2017
    Inventors: Takamasa HANAI, Hikaru SUNABE, Satoshi NINAGAWA, Shin NAKAMURA, Masatoshi NAKAHAMA, Kazusa FUKUDA, Kenichi MIYATA
  • Patent number: 9539682
    Abstract: A power tool includes a clamp shaft for clamping a tool accessory to the power tool and a clamp shaft holding mechanism for selectively locking the clamp shaft to hold the clamp shaft in a position that secures the tool accessory on the power tool. The power tool also includes a lever for shifting the clamp shaft holding mechanism between clamped and unclamped states. The lever is configured such that when an operator grasps the lever and moves it toward a position for releasing the tool accessory, the lever and the operator's hand move away from the tool accessory.
    Type: Grant
    Filed: January 2, 2014
    Date of Patent: January 10, 2017
    Assignee: MAKITA CORPORATION
    Inventors: Takahiro Kawakami, Shin Nakamura, Masatoshi Nakahama
  • Publication number: 20150263592
    Abstract: A power tool includes a brushless motor having a stator and a rotor, which includes a rotary shaft extending in a front-rear direction of the power tool. The rotary shaft rotates a spindle that extends in an up-down direction of the power tool. A fan is fixedly coupled to the rotary shaft and rotates therewith. A switch is disposed rearward of the brushless motor and a controller is disposed rearward of the switch in the front-rear direction. A battery pack is disposed rearward of the controller. A main-body housing houses the brushless motor, the switch and the controller. The main-body housing includes a first tubular part, which houses the brushless motor, and a second tubular part, which houses the switch. The diameter of the second tubular part is smaller than the diameter of the first tubular part.
    Type: Application
    Filed: February 25, 2015
    Publication date: September 17, 2015
    Inventors: Takahiro KAWAKAMI, Masatoshi NAKAHAMA
  • Publication number: 20140191481
    Abstract: A power tool includes a clamp shaft for clamping a tool accessory to the power tool and a clamp shaft holding mechanism for selectively locking the clamp shaft to hold the clamp shaft in a position that secures the tool accessory on the power tool. The power tool also includes a lever for shifting the clamp shaft holding mechanism between clamped and unclamped states. The lever is configured such that when an operator grasps the lever and moves it toward a position for releasing the tool accessory, the lever and the operator's hand move away from the tool accessory.
    Type: Application
    Filed: January 2, 2014
    Publication date: July 10, 2014
    Applicant: MAKITA CORPORATION
    Inventors: Takahiro KAWAKAMI, Shin NAKAMURA, Masatoshi NAKAHAMA