Patents by Inventor Takafumi KOTSUJI

Takafumi KOTSUJI 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
  • Publication number: 20210299813
    Abstract: An electric power tool disclosed herein may include a motor; a power transmission mechanism connected to the motor; a housing that houses the motor and the power transmission mechanism; a tip tool holder connected to the power transmission mechanism; a cover covering the tip tool holder partially; a first locking mechanism configured to switch between a first locking state and a first unlocked state; and a second locking mechanism configured to switch between a second locking state and a second unlocked state. In the electric power tool, the cover may become detachable from the housing when the user performs the second unlocking operation on the second locking mechanism and the first unlocking operation on the first locking mechanism.
    Type: Application
    Filed: August 1, 2019
    Publication date: September 30, 2021
    Applicant: MAKITA CORPORATION
    Inventors: Kenichi TABUSHI, Akira MIZUTANI, Ken GOTO, Kenji SHIBATA, Hideharu MUTO, Satoshi NINAGAWA, Junya ISHIKAWA, Takafumi KOTSUJI
  • Publication number: 20210252667
    Abstract: A power tool includes a spindle, holding members each having a claw, a biasing member, and a locking member. The holding members are movable between a first position, in which the holding members fixedly hold a tool accessory against a tool mounting part of the spindle with the claws pressed against the tool accessory owing to a biasing force of the biasing member, and a second position, in which the holding members do not impede or block attachment or detachment of the tool accessory. The locking member is configured to move between a locking position, in which the locking member abut on the claws of the holding members to hold the holding members in the second position, and an unlocking position, in which the locking member does not impede or block the holding members from moving from the second position to the first position.
    Type: Application
    Filed: January 22, 2021
    Publication date: August 19, 2021
    Inventor: Takafumi KOTSUJI
  • Patent number: 11045938
    Abstract: Several means 71, 72, 73, 74, and 75 are provided for restricting a relative displacement in a separating direction of half-split housings 50L, 50R. At one or more of several screw-connection parts 60 of the left and right half-split housings 50L, 50R, a press-fitting protrusion 71a is provided in an insertion hole 62a of a boss-receiving part 62 into which a screw-boss part 61 is inserted. By press-fitting the screw-boss part 61 to the boss-receiving part 62, a separation resistance may be introduced between the left and right half-split housings 50L, 50R.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: June 29, 2021
    Assignee: MAKITA CORPORATION
    Inventors: Junichi Iwakami, Shin Nakamura, Akira Mizutani, Takafumi Kotsuji
  • Patent number: 11045939
    Abstract: A power tool (1), such as a multi-tool, includes: a motor (21) extending in a front-rear direction; a motor housing (2) that houses the motor (21); a head housing (7) held forward of the motor housing (2); and an output shaft (60) protruding downward from the head housing (7). The head housing (7) may be made of a resin. In addition or in the alternative, the head housing (7) includes a lower-head housing case (4) screw fastened to an upper-head housing cover (5). In addition or in the alternative, the motor housing has a two-halved structure in which two half housings (2a, 2b) are screw fastened together.
    Type: Grant
    Filed: January 24, 2019
    Date of Patent: June 29, 2021
    Assignee: MAKITA CORPORATION
    Inventors: Takafumi Kotsuji, Akira Mizutani
  • Publication number: 20210053175
    Abstract: A hand-held tool, such as a disc grinder, is used to perform work at a high work site, a countermeasure is taken to prevent the hand-held tool from falling by using a suspension tool, such as a tether strap. If a coupling part that couples the suspension tool to the hand-held tool is damaged, this fact is notified to a user. Thereby, an original function of the suspension tool can be reliably performed. If a large impact is applied to a coupling member via a suspension tool, the coupling member is displaced to a second position, due to the deformation of a first position retaining member. A conductive portion disengages from contacts to cause a power circuit to be shut off, thereby prohibiting a main body part from being activated.
    Type: Application
    Filed: March 27, 2019
    Publication date: February 25, 2021
    Applicant: MAKITA CORPORATION
    Inventors: Ryosuke OTANI, Junya ISHIKAWA, Takafumi KOTSUJI, Satoshi NINAGAWA, Ken GOTO, Yu ETO
  • Patent number: 10688644
    Abstract: A power tool includes a motor, a housing, a battery mounting part, and a battery protection part. The battery mounting part is provided to the housing on an opposite side from a working axis across the motor in an extending direction of a rotation axis of the motor. The battery mounting part is configured such that one end portion of at least one battery is mounted to the battery mounting part and an opposite end portion of the at least one battery in the extending direction of the rotation axis is exposed from the housing. The battery protection part is provided to an outer surface portion of the housing and configured to protect at least one corner region of the opposite end portion of the at least one battery against external force when the one end portion is mounted to the battery mounting part.
    Type: Grant
    Filed: November 2, 2017
    Date of Patent: June 23, 2020
    Assignee: MAKITA CORPORATION
    Inventors: Hitoshi Iida, Masanori Furusawa, Kei Watanabe, Takafumi Kotsuji, Keisuke Yamada
  • Patent number: 10478943
    Abstract: A grinder (100) includes a motor (12), a housing (4, 6, 30), a spindle (24), a first cover (120), and a second cover (170). The spindle protrudes downward from the housing, is driven by the motor, and thereby rotates. The first cover is provided in the circumferential direction of the spindle, is fixed to the housing, and at least partially covers a tool accessory (40), which is mounted on the spindle, from above. The second cover is detachably mounted on the housing (6) independently of the first cover.
    Type: Grant
    Filed: September 7, 2016
    Date of Patent: November 19, 2019
    Assignee: MAKITA CORPORATION
    Inventors: Shin Nakamura, Takafumi Kotsuji, Ken Goto, Akira Mizutani, Junya Ishikawa
  • Publication number: 20190299387
    Abstract: A power tool (1), such as a multi-tool, includes: a motor (21) extending in a front-rear direction; a motor housing (2) that houses the motor (21); a head housing (7) held forward of the motor housing (2); and an output shaft (60) protruding downward from the head housing (7). The head housing (7) may be made of a resin. In addition or in the alternative, the head housing (7) includes a lower-head housing case (4) screw fastened to an upper-head housing cover (5). In addition or in the alternative, the motor housing has a two-halved structure in which two half housings (2a, 2b) are screw fastened together.
    Type: Application
    Filed: January 24, 2019
    Publication date: October 3, 2019
    Inventors: Takafumi KOTSUJI, Akira MIZUTANI
  • Publication number: 20180126534
    Abstract: A power tool includes a motor, a housing, a battery mounting part, and a battery protection part. The battery mounting part is provided to the housing on an opposite side from a working axis across the motor in an extending direction of a rotation axis of the motor. The battery mounting part is configured such that one end portion of at least one battery is mounted to the battery mounting part and an opposite end portion of the at least one battery in the extending direction of the rotation axis is exposed from the housing. The battery protection part is provided to an outer surface portion of the housing and configured to protect at least one corner region of the opposite end portion of the at least one battery against external force when the one end portion is mounted to the battery mounting part.
    Type: Application
    Filed: November 2, 2017
    Publication date: May 10, 2018
    Applicant: MAKITA CORPORATION
    Inventors: Hitoshi IIDA, Masanori FURUSAWA, Kei WATANABE, Takafumi KOTSUJI, Keisuke YAMADA
  • Publication number: 20170225316
    Abstract: Several means 71, 72, 73, 74, and 75 are provided for restricting a relative displacement in a separating direction of half-split housings 50L, 50R. At one or more of several screw-connection parts 60 of the left and right half-split housings 50L, 50R, a press-fitting protrusion 71a is provided in an insertion hole 62a of a boss-receiving part 62 into which a screw-boss part 61 is inserted. By press-fitting the screw-boss part 61 to the boss-receiving part 62, a separation resistance may be introduced between the left and right half-split housings 50L, 50R.
    Type: Application
    Filed: January 27, 2017
    Publication date: August 10, 2017
    Applicant: MAKITA CORPORATION
    Inventors: Junichi IWAKAMI, Shin NAKAMURA, Akira MIZUTANI, Takafumi KOTSUJI
  • Publication number: 20170072534
    Abstract: A grinder (100) includes a motor (12), a housing (4, 6, 30), a spindle (24), a first cover (120), and a second cover (170). The spindle protrudes downward from the housing, is driven by the motor, and thereby rotates. The first cover is provided in the circumferential direction of the spindle, is fixed to the housing, and at least partially covers a tool accessory (40), which is mounted on the spindle, from above. The second cover is detachably mounted on the housing (6) independently of the first cover.
    Type: Application
    Filed: September 7, 2016
    Publication date: March 16, 2017
    Inventors: Shin NAKAMURA, Takafumi KOTSUJI, Ken GOTO, Akira MIZUTANI, Junya ISHIKAWA
  • Patent number: D783379
    Type: Grant
    Filed: March 17, 2016
    Date of Patent: April 11, 2017
    Assignee: MAKITA CORPORATION
    Inventors: Koji Takahashi, Akira Mizutani, Takafumi Kotsuji
  • Patent number: D891213
    Type: Grant
    Filed: April 2, 2019
    Date of Patent: July 28, 2020
    Assignee: MAKITA CORPORATION
    Inventors: Kazunori Hattori, Takafumi Kotsuji