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公开(公告)号：US12151354B2
公开(公告)日：2024-11-26
申请号：US17049911
申请日：2019-03-20
Inventor： Mitsumasa Mizuno , Itaru Murui , Atsushi Nakamura
IPC: B25F5/00 , B25B21/02 , B25B23/147
Abstract: A torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to a side of driving shaft driven into rotation by a motor and a driven magnet member coupled to a side of an output shaft on which a front-end tool is attachable. A clutch mechanism is provided between the motor and the torque transmission mechanism. A moment of inertia on the side of the driven magnet member is larger than a moment of inertia on the side of the driving magnet member.
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公开(公告)号：US12030161B2
公开(公告)日：2024-07-09
申请号：US17766899
申请日：2020-09-18
Inventor： Itaru Murui , Kotaro Momoeda , Kota Kitamura , Naoki Tsujimoto , Akito Nakamura
IPC: B25B23/147 , B25B21/02 , B25F5/00
CPC classification number: B25B23/147 , B25B21/02 , B25F5/001
Abstract: An electric tool includes an output shaft and a controller. The output shaft is configured to hold a tip tool and be rotated by motive power provided from an electric motor with the output shaft holding the tip tool. The controller is configured to control rotation of the output shaft in accordance with pressing force in a direction from a tip end of the tip tool toward the output shaft. The electric tool has, as an operation range, a restriction range in which rotation of the output shaft is restricted in a state where the pressing force is less than or equal to a prescribed value.
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公开(公告)号：US11235445B2
公开(公告)日：2022-02-01
申请号：US16487794
申请日：2017-11-30
Inventor： Itaru Murui , Hiroaki Murakami , Mitsumasa Mizuno , Akiko Honda , Satoshi Kajiyama
Abstract: An electric power tool includes: a driving shaft that is rotated by a motor; an output shaft on which a front-end tool is attachable; and a torque transmission mechanism that transmits a torque produced by the rotation of the driving shaft to the output shaft. The torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to a side of the driving shaft and a driven magnet member coupled to a side of the output shaft, and the driving magnet member and the driven magnet member are provided such that respective magnetic surfaces face each other, S-poles and N-poles being alternately arranged on each of the magnetic surfaces.
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公开(公告)号：US12053864B2
公开(公告)日：2024-08-06
申请号：US17778308
申请日：2020-09-18
Inventor： Itaru Murui , Shota Fujii , Keita Okamoto , Naoki Tsujimoto , Kota Kitamura , Kotaro Momoeda
IPC: B25B23/147 , B25B21/02 , H02P23/00
CPC classification number: B25B23/1475 , B25B21/02 , H02P23/0004
Abstract: An electric tool system includes a motor, a control unit, and an output shaft. The motor includes a stator and a rotor. The control unit performs vector control on the motor. The control unit includes a first acquisition unit, a second acquisition unit, and a command value generation unit. The command value generation unit calculates, based on a torque current acquisition value (current measured value) as a value related to a torque current as acquired by the first acquisition unit and an acceleration acquisition value as a value related to acceleration of the rotor as acquired by the second acquisition unit, at least one of a command value of the torque current to be supplied to the motor or a command value of an excitation current to be supplied to the motor.
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公开(公告)号：US11632017B2
公开(公告)日：2023-04-18
申请号：US16828690
申请日：2020-03-24
Inventor： Itaru Murui , Masari Muramatsu , Motoharu Muto , Kota Kitamura
IPC: H02K7/14 , B25B21/02 , B25F5/02 , H02K11/215
Abstract: A motor for electric power tools according to an embodiment includes: a rotor having a rotational shaft; a stator having a coil to rotate the rotor; a first substrate mounting a sensor element to detect a rotational position of the rotor; and a second substrate mounting a switching element to change, based on a result of detection by the sensor element, a conducting direction in which a current flows with respect to the coil. The first substrate and the second substrate are arranged side by side along, and intersect at right angles with, the rotational shaft.
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Patent Agency Ranking
公开(公告)号：US11569725B2
公开(公告)日：2023-01-31
申请号：US16647466
申请日：2018-06-15
Inventor： Mitsumasa Mizuno , Itaru Murui , Satoshi Kajiyama , Hiroaki Murakami , Akiko Honda
Abstract: A torque transmission mechanism transmits a torque produced by a rotation of a driving shaft to an output shaft. A clutch mechanism is provided between a motor and the torque transmission mechanism. The torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to the driving shaft side and a driven magnet member coupled to the output shaft side. The driving magnet member and the driven magnet member are arranged such that magnetic surfaces on each of which S-pole magnets and N-pole magnets are alternately arranged face other. The clutch mechanism transmits the torque produced by the rotation of the driving shaft to the driving magnet member but does not transmit a torque the driving magnet member receives from the driven magnet member to the driving shaft.
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公开(公告)号：US12121981B2
公开(公告)日：2024-10-22
申请号：US17766914
申请日：2020-09-18
Inventor： Kota Kitamura , Itaru Murui , Naoki Tsujimoto , Kotaro Momoeda , Akito Nakamura
Abstract: An electric tool includes a pressure-sensitive sensor, a support, an output shaft, and a controller. The pressure-sensitive sensor is configured to sense pressing force which is externally provided. The support supports the pressure-sensitive sensor. The output shaft is configured to hold a tip tool and be rotated relative to the support by motive power provided from an electric motor with the output shaft holding the tip tool. The controller is configured to control rotation of the output shaft in accordance with an output according to the pressing force, the output being output from the pressure-sensitive sensor.
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公开(公告)号：US12079539B2
公开(公告)日：2024-09-03
申请号：US17045134
申请日：2019-03-20
Inventor： Kazuo Dobashi , Itaru Murui
Abstract: A control unit is adapted to perform a process related to an electric power tool, based on sound input to a microphone. The control unit performs a process related to the electric power tool, based on a result of subjecting input sound to a sound recognition process or a result of subjecting the sound to sound analysis. When a user operation switch is in an on state, the control unit does not perform a sound recognition process, and, when the user operation switch is in an off state, the control unit performs a sound recognition process. Further, when the electric power tool is not in a state of being gripped by the user, the control unit does not perform a sound recognition process, and, when the electric power tool is in a state of being gripped by the user, the control unit performs a sound recognition process.
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公开(公告)号：US11890727B2
公开(公告)日：2024-02-06
申请号：US17556488
申请日：2021-12-20
Inventor： Itaru Murui , Hiroaki Murakami , Mitsumasa Mizuno , Akiko Honda , Satoshi Kajiyama
CPC classification number: B25B21/02 , B25B23/1405
Abstract: An electric power tool includes: a driving shaft that is rotated by a motor; an output shaft on which a front-end tool is attachable; and a torque transmission mechanism that transmits a torque produced by the rotation of the driving shaft to the output shaft. The torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to a side of the driving shaft and a driven magnet member coupled to a side of the output shaft, and the driving magnet member and the driven magnet member are provided such that respective magnetic surfaces face each other, S-poles and N-poles being alternately arranged on each of the magnetic surfaces.
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公开(公告)号：US11724371B2
公开(公告)日：2023-08-15
申请号：US17274066
申请日：2019-06-26
Inventor： Itaru Murui , Mitsumasa Mizuno , Hiroaki Murakami , Takashi Kusagawa , Masahiro Sato , Masanori Nakamoto , Akiko Honda
IPC: B25B23/147 , B25F5/02
CPC classification number: B25B23/147 , B25F5/021
Abstract: An electric power tool includes: an output shaft on which a front-end tool is adapted to be mounted; and a power transmission mechanism that transmits a rotational output of a motor to the output shaft. A posture information acquisition unit acquires posture information for identifying a posture of the electric power tool. A torque information acquisition unit acquires torque information indicating a measured value of tightening torque produced by the front-end tool. A transmission unit transmits the posture information, the torque information, and time information related to a time when respective information is acquired to an external apparatus.
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