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).
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Patent number: 11964356Abstract: 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: GrantFiled: March 27, 2019Date of Patent: April 23, 2024Assignee: MAKITA CORPORATIONInventors: Ryosuke Otani, Junya Ishikawa, Takafumi Kotsuji, Satoshi Ninagawa, Ken Goto, Yu Eto
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Publication number: 20240066678Abstract: 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: ApplicationFiled: November 9, 2023Publication date: February 29, 2024Applicant: MAKITA CORPORATIONInventors: Takafumi KOTSUJI, Shin NAKAMURA, Akira MIZUTANI, Masatoshi NAKAHAMA, Yoshihiro OZEKI
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Patent number: 11850720Abstract: 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: GrantFiled: October 28, 2021Date of Patent: December 26, 2023Assignee: MAKITA CORPORATIONInventors: Takafumi Kotsuji, Shin Nakamura, Akira Mizutani, Masatoshi Nakahama, Yoshihiro Ozeki
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Patent number: 11772171Abstract: 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: GrantFiled: January 22, 2021Date of Patent: October 3, 2023Assignee: MAKITA CORPORATIONInventor: Takafumi Kotsuji
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Publication number: 20230119351Abstract: A tool includes a first accessory, at least two first attachment portions for detachably and selectively attaching the first accessory, and a single first intermediate member provided in common for the at least two first attachment portions. The first intermediate member includes at least one pressed portion configured to, when the first accessory is attached to one first attachment portion arbitrarily selected from the at least two first attachment portions, be directly or indirectly pressed by the first accessory. The first intermediate member is configured to be displaced when the at least one pressed portion is pressed. The tool further includes a single first sensor configured to detect that the first intermediate member is displaced.Type: ApplicationFiled: April 8, 2021Publication date: April 20, 2023Applicant: MAKITA CORPORATIONInventors: Shin SUGIURA, Takafumi KOTSUJI, Ryosuke OTANI, Fumiyoshi SAITO
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Publication number: 20220168867Abstract: 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: ApplicationFiled: November 29, 2021Publication date: June 2, 2022Applicant: MAKITA CORPORATIONInventors: Shin NAKAMURA, Takafumi KOTSUJI, Masatoshi NAKAHAMA
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Publication number: 20220134528Abstract: 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: ApplicationFiled: October 28, 2021Publication date: May 5, 2022Applicant: MAKITA CORPORATIONInventors: Takafumi KOTSUJI, Shin NAKAMURA, Akira MIZUTANI, Masatoshi NAKAHAMA, Yoshihiro OZEKI
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Publication number: 20210299813Abstract: 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: ApplicationFiled: August 1, 2019Publication date: September 30, 2021Applicant: MAKITA CORPORATIONInventors: Kenichi TABUSHI, Akira MIZUTANI, Ken GOTO, Kenji SHIBATA, Hideharu MUTO, Satoshi NINAGAWA, Junya ISHIKAWA, Takafumi KOTSUJI
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Publication number: 20210252667Abstract: 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: ApplicationFiled: January 22, 2021Publication date: August 19, 2021Inventor: Takafumi KOTSUJI
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Patent number: 11045939Abstract: 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: GrantFiled: January 24, 2019Date of Patent: June 29, 2021Assignee: MAKITA CORPORATIONInventors: Takafumi Kotsuji, Akira Mizutani
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Patent number: 11045938Abstract: 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: GrantFiled: January 27, 2017Date of Patent: June 29, 2021Assignee: MAKITA CORPORATIONInventors: Junichi Iwakami, Shin Nakamura, Akira Mizutani, Takafumi Kotsuji
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Publication number: 20210053175Abstract: 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: ApplicationFiled: March 27, 2019Publication date: February 25, 2021Applicant: MAKITA CORPORATIONInventors: Ryosuke OTANI, Junya ISHIKAWA, Takafumi KOTSUJI, Satoshi NINAGAWA, Ken GOTO, Yu ETO
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Patent number: 10688644Abstract: 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: GrantFiled: November 2, 2017Date of Patent: June 23, 2020Assignee: MAKITA CORPORATIONInventors: Hitoshi Iida, Masanori Furusawa, Kei Watanabe, Takafumi Kotsuji, Keisuke Yamada
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Patent number: 10478943Abstract: 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: GrantFiled: September 7, 2016Date of Patent: November 19, 2019Assignee: MAKITA CORPORATIONInventors: Shin Nakamura, Takafumi Kotsuji, Ken Goto, Akira Mizutani, Junya Ishikawa
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Publication number: 20190299387Abstract: 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: ApplicationFiled: January 24, 2019Publication date: October 3, 2019Inventors: Takafumi KOTSUJI, Akira MIZUTANI
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Publication number: 20180126534Abstract: 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: ApplicationFiled: November 2, 2017Publication date: May 10, 2018Applicant: MAKITA CORPORATIONInventors: Hitoshi IIDA, Masanori FURUSAWA, Kei WATANABE, Takafumi KOTSUJI, Keisuke YAMADA
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Publication number: 20170225316Abstract: 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: ApplicationFiled: January 27, 2017Publication date: August 10, 2017Applicant: MAKITA CORPORATIONInventors: Junichi IWAKAMI, Shin NAKAMURA, Akira MIZUTANI, Takafumi KOTSUJI
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Publication number: 20170072534Abstract: 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: ApplicationFiled: September 7, 2016Publication date: March 16, 2017Inventors: Shin NAKAMURA, Takafumi KOTSUJI, Ken GOTO, Akira MIZUTANI, Junya ISHIKAWA
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Patent number: D783379Type: GrantFiled: March 17, 2016Date of Patent: April 11, 2017Assignee: MAKITA CORPORATIONInventors: Koji Takahashi, Akira Mizutani, Takafumi Kotsuji
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Patent number: D891213Type: GrantFiled: April 2, 2019Date of Patent: July 28, 2020Assignee: MAKITA CORPORATIONInventors: Kazunori Hattori, Takafumi Kotsuji