Patents by Inventor Motohiro Omura
Motohiro Omura 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: 11911881Abstract: A rotary tool includes a motor having an axis of rotation extending in a forward-rearward direction of the rotary tool. A grip part is located below the axis of rotation in an up-down direction that is perpendicular to the forward-rearward direction. A planet gear is configured to be driven by the motor. An internal gear meshes with the planet gear and is movable in the forward-rearward direction to change a speed. A sun gear meshes with the planet gear, and an output shaft is configured to be rotationally driven by the sun gear. A sensor is configured to detect the forward-rearward movement of the internal gear, the sensor being disposed downward of the sun gear in the up-down direction.Type: GrantFiled: April 28, 2023Date of Patent: February 27, 2024Assignee: MAKITA CORPORATIONInventors: Yuta Araki, Motohiro Omura, Akira Ito
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Publication number: 20240014671Abstract: A battery-powered system includes a battery pack (10; 71; 81) connected to an electrical equipment (30; 50; 76; 86). The battery pack includes a first positive electrode terminal (11), a first negative electrode terminal (12), a first communication terminal (13), a first data input circuit (23), and a first limiting circuit (D11; D72; D82) that limits a flow of electric current in a direction from the first negative electrode terminal to the first communication terminal via the first data input circuit. The connected equipment includes a second positive electrode terminal (31; 51), a second negative electrode terminal (32; 52), a second communication terminal (33; 53), a second data input circuit (43; 63; 77; 87), and a second limiting circuit (D31; D51; D77; D87) that limits a flow of electric current in a direction from the second negative electrode terminal to the second communication terminal via the second data input circuit.Type: ApplicationFiled: September 25, 2023Publication date: January 11, 2024Inventors: Minoru GYODA, Hitoshi SUZUKI, Motohiro OMURA
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Patent number: 11811249Abstract: A battery-powered system includes a battery pack (10; 71; 81) connected to an electrical equipment (30; 50; 76; 86). The battery pack includes a first positive electrode terminal (11), a first negative electrode terminal (12), a first communication terminal (13), a first data input circuit (23), and a first limiting circuit (D11; D72; D82) that limits a flow of electric current in a direction from the first negative electrode terminal to the first communication terminal via the first data input circuit. The connected equipment includes a second positive electrode terminal (31; 51), a second negative electrode terminal (32; 52), a second communication terminal (33; 53), a second data input circuit (43; 63; 77; 87), and a second limiting circuit (D31; D51; D77; D87) that limits a flow of electric current in a direction from the second negative electrode terminal to the second communication terminal via the second data input circuit.Type: GrantFiled: June 2, 2020Date of Patent: November 7, 2023Assignee: MAKITA CORPORATIONInventors: Minoru Gyoda, Hitoshi Suzuki, Motohiro Omura
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Publication number: 20230256572Abstract: A rotary tool includes a motor having an axis of rotation extending in a forward-rearward direction of the rotary tool. A grip part is located below the axis of rotation in an up-down direction that is perpendicular to the forward-rearward direction. A planet gear is configured to be driven by the motor. An internal gear meshes with the planet gear and is movable in the forward-rearward direction to change a speed. A sun gear meshes with the planet gear, and an output shaft is configured to be rotationally driven by the sun gear. A sensor is configured to detect the forward-rearward movement of the internal gear, the sensor being disposed downward of the sun gear in the up-down direction.Type: ApplicationFiled: April 28, 2023Publication date: August 17, 2023Applicant: MAKITA CORPORATIONInventors: Yuta ARAKI, Motohiro OMURA, Akira ITO
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Patent number: 11673240Abstract: A driver-drill (1) includes: a controller (32), which stops rotation of a brushless motor (9) when a torque applied to a spindle (26) reaches a prescribed clutch-actuation torque; and a dial (65), which is capable of specifying, to the controller (32), the setting of the prescribed clutch-actuation torque within a prescribed high-low range of values. In the controller (32), a relationship between clutch-actuation torques and each value in the high-low range is set such that, in a first range in which the values are low, changes in the clutch-actuation torques are the same in the low-speed mode and in the high-speed mode and such that, in a second range outside of the first range, the clutch-actuation torques in the low-speed mode are higher than in the high-speed mode.Type: GrantFiled: July 22, 2020Date of Patent: June 13, 2023Assignee: MAKITA CORPORATIONInventors: Yuta Araki, Motohiro Omura, Akira Ito
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Patent number: 11146087Abstract: An electric working machine of one aspect of the present disclosure includes a connection port, a control circuit, and/or a power supply switch. The power supply switch is provided on a power supply path extending from a battery pack connected to the connection port to the control circuit. The power supply switch maintains an ON state while a power supply permission signal is output from the battery pack to the electric working machine. The control circuit outputs an ON-command signal to the power supply switch for a specified period of time in response to loss of the power supply permission signal from the battery pack.Type: GrantFiled: May 27, 2020Date of Patent: October 12, 2021Assignee: MAKITA CORPORATIONInventors: Motohiro Omura, Junya Matsushita, Yoshitaka Ichikawa
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Publication number: 20210069886Abstract: An electric work machine (1; 110; 120; 130), such as a power tool, includes a motor (11) having a rotor, a drive part (13) that supplies electric currents to drive the motor, a rotational-direction selection part (17), and a motor-control part (14; 31, 32, 40, 50, 60; 14, 40, 60, 73, 80; 14, 60, 91). The rotational-direction selection part is configured for manually setting (selecting) the rotational direction of the rotor and outputs first and second setting signals that each indicate the set (selected) rotational direction. The motor-control part controls the drive part such that the rotor rotates in the rotational direction indicated by the first setting signal and/or the second setting signal. In response to a determination that the rotational directions indicated by the first and second setting signals are inconsistent, the motor-control part stops or prevents the drive of the motor.Type: ApplicationFiled: September 8, 2020Publication date: March 11, 2021Inventors: Hitoshi SUZUKI, Seitaro HAYASHI, Motohiro OMURA, Itsuku KATO
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Publication number: 20210039231Abstract: A driver-drill (1) includes: a controller (32), which stops rotation of a brushless motor (9) when a torque applied to a spindle (26) reaches a prescribed clutch-actuation torque; and a dial (65), which is capable of specifying, to the controller (32), the setting of the prescribed clutch-actuation torque within a prescribed high-low range of values. In the controller (32), a relationship between clutch-actuation torques and each value in the high-low range is set such that, in a first range in which the values are low, changes in the clutch-actuation torques are the same in the low-speed mode and in the high-speed mode and such that, in a second range outside of the first range, the clutch-actuation torques in the low-speed mode are higher than in the high-speed mode.Type: ApplicationFiled: July 22, 2020Publication date: February 11, 2021Inventors: Yuta ARAKI, Motohiro OMURA, Akira ITO
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Patent number: 10886816Abstract: A power tool including a brushless motor having a sensor circuit board has higher durability. The power tool includes a housing, a brushless motor including a rotor having a rotational shaft, a stator, and a sensor circuit board fixed to the stator and having a rotation detecting element that detects rotation of the rotor, and receiving the rotational shaft through the sensor circuit board, and a bearing held in the housing and supporting the rotational shaft. The bearing is located to overlap the rotation detecting element in an axial direction of the rotational shaft.Type: GrantFiled: January 18, 2018Date of Patent: January 5, 2021Assignee: MAKITA CORPORATIONInventors: Toan Van Doan, Motohiro Omura, Tatsuya Nagahama
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Publication number: 20200388817Abstract: A battery-powered system includes a battery pack (10; 71; 81) connected to an electrical equipment (30; 50; 76; 86). The battery pack includes a first positive electrode terminal (11), a first negative electrode terminal (12), a first communication terminal (13), a first data input circuit (23), and a first limiting circuit (D11; D72; D82) that limits a flow of electric current in a direction from the first negative electrode terminal to the first communication terminal via the first data input circuit. The connected equipment includes a second positive electrode terminal (31; 51), a second negative electrode terminal (32; 52), a second communication terminal (33; 53), a second data input circuit (43; 63; 77; 87), and a second limiting circuit (D31; D51; D77; D87) that limits a flow of electric current in a direction from the second negative electrode terminal to the second communication terminal via the second data input circuit.Type: ApplicationFiled: June 2, 2020Publication date: December 10, 2020Inventors: Minoru GYODA, Hitoshi SUZUKI, Motohiro OMURA
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Publication number: 20200381933Abstract: An electric working machine of one aspect of the present disclosure includes a connection port, a control circuit, and/or a power supply switch. The power supply switch is provided on a power supply path extending from a battery pack connected to the connection port to the control circuit. The power supply switch maintains an ON state while a power supply permission signal is output from the battery pack to the electric working machine. The control circuit outputs an ON-command signal to the power supply switch for a specified period of time in response to loss of the power supply permission signal from the battery pack.Type: ApplicationFiled: May 27, 2020Publication date: December 3, 2020Applicant: MAKITA CORPORATIONInventors: Motohiro OMURA, Junya MATSUSHITA, Yoshitaka ICHIKAWA
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Patent number: 10848032Abstract: A power tool including a brushless motor having a sensor circuit board has higher durability. The power tool includes a housing, a brushless motor including a rotor having a rotational shaft, a stator, and a sensor circuit board fixed to the stator and having a rotation detecting element that detects rotation of the rotor, and receiving the rotational shaft through the sensor circuit board, and a bearing held in the housing and supporting the rotational shaft. The bearing is located to overlap the rotation detecting element in an axial direction of the rotational shaft.Type: GrantFiled: January 18, 2018Date of Patent: November 24, 2020Assignee: MAKITA CORPORATIONInventors: Toan Van Doan, Motohiro Omura, Tatsuya Nagahama
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Patent number: 10326337Abstract: In an electric power tool which houses a motor and a controller for controlling drive of the motor, the controller has a circuit board on which electric components are mounted and a heat radiation member which radiates heat of the electric components. The heat radiation member has a facing part which faces the circuit board in parallel to a board surface of the circuit board. The facing part is provided with steps by which a distance between the facing part and the board surface of the circuit board varies. Furthermore, the facing part of the heat radiation member is provided with a first facing part in which a relative distance with respect to the board surface of the circuit board is reduced.Type: GrantFiled: July 6, 2015Date of Patent: June 18, 2019Assignee: MAKITA CORPORATIONInventors: Motohiro Omura, Ryosuke Suzuki, Hideyuki Taga
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Patent number: 10099392Abstract: Electric scissors comprise a motor, a movable blade, a transmission mechanism, an operation device, an operation signal output device, a control device, a drive circuit, and a forced stop device. The forced stop device is configured to stop the motor when an abnormal state is present in which the value of the operation signal output from the operation signal output device is a value determined in the control device to rotate the motor in a specific rotation direction out of the first and the second rotation directions or to stop the motor, and in which the motor is rotating in a direction opposite to the specific rotation direction.Type: GrantFiled: July 27, 2016Date of Patent: October 16, 2018Assignee: MAKITA CORPORATIONInventors: Hidekazu Suda, Motohiro Omura
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Publication number: 20180241281Abstract: A power tool including a brushless motor having a sensor circuit board has higher durability. The power tool includes a housing, a brushless motor including a rotor having a rotational shaft, a stator, and a sensor circuit board fixed to the stator and having a rotation detecting element that detects rotation of the rotor, and receiving the rotational shaft through the sensor circuit board, and a bearing held in the housing and supporting the rotational shaft. The bearing is located to overlap the rotation detecting element in an axial direction of the rotational shaft.Type: ApplicationFiled: January 18, 2018Publication date: August 23, 2018Applicant: MAKITA CORPORATIONInventors: Toan Van DOAN, Motohiro OMURA, Tatsuya NAGAHAMA
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Patent number: 9853586Abstract: A motor driven appliance comprises a battery, a motor, at least one switch, a control unit, an abnormality detection unit, a determination unit, and a processing unit. The at least one switch comprises an operation switch. The control unit controls driving of the motor by controlling power supply from the battery to the motor when the operation switch is turned on. The abnormality detection unit detects abnormality of the appliance. The determination unit determines whether the detected abnormality is a first type abnormality that can be cleared when the operation switch is switched from on to off, or is a second type abnormality that cannot be cleared even if the operation switch is merely switched from on to off. The processing unit is configured to perform a specific process when it is determined that the detected abnormality is the second type abnormality.Type: GrantFiled: July 16, 2015Date of Patent: December 26, 2017Assignee: MAKITA CORPORATIONInventors: Takuya Kusakawa, Goshi Ishikawa, Motohiro Omura
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Patent number: 9844849Abstract: A motor driven appliance in one aspect of embodiments of the present disclosure comprises a light source, a lighting unit, a motor, an operation unit, an operation detector, a reference signal output unit, a determination unit, and a control unit. The operation detector detects that the operation unit is operated, and outputs an operation detection signal that indicates that the operation unit is operated. The reference signal output unit outputs at least one reference signal that can be used as a reference for determining whether the detection by the operation detector is normal. The determination unit determines whether the operation unit is actually operated based on the operation detection signal and the at least one reference signal. The control unit controls operation of the lighting unit based on the determination made by the determination unit.Type: GrantFiled: January 15, 2015Date of Patent: December 19, 2017Assignee: MAKITA CORPORATIONInventors: Seitaro Hayashi, Goshi Ishikawa, Tatsuki Mori, Motohiro Omura, Tatsuya Yoshizaki
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Patent number: 9815165Abstract: A motor driven appliance in one aspect of embodiments of the present disclosure comprises a light source, a lighting unit, a motor, an operation unit, an operation detector, a reference signal output unit, a determination unit, and a control unit. The operation detector detects that the operation unit is operated, and outputs an operation detection signal that indicates that the operation unit is operated. The reference signal output unit outputs at least one reference signal that can be used as a reference for determining whether the detection by the operation detector is normal. The determination unit determines whether the operation unit is actually operated based on the operation detection signal and the at least one reference signal. The control unit controls operation of the lighting unit based on the determination made by the determination unit.Type: GrantFiled: January 15, 2015Date of Patent: November 14, 2017Assignee: MAKITA CORPORATIONInventors: Seitaro Hayashi, Goshi Ishikawa, Tatsuki Mori, Motohiro Omura, Tatsuya Yoshizaki
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Publication number: 20170036359Abstract: Electric scissors comprise a motor, a movable blade, a transmission mechanism, an operation device, an operation signal output device, a control device, a drive circuit, and a forced stop device. The forced stop device is configured to stop the motor when an abnormal state is present in which the value of the operation signal output from the operation signal output device is a value determined in the control device to rotate the motor in a specific rotation direction out of the first and the second rotation directions or to stop the motor, and in which the motor is rotating in a direction opposite to the specific rotation direction.Type: ApplicationFiled: July 27, 2016Publication date: February 9, 2017Applicant: MAKITA CORPORATIONInventors: Hidekazu SUDA, Motohiro OMURA
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Patent number: 9381584Abstract: A cordless electric power tool comprises a motor that drives a tool, a battery that supply electric power to the motor and a motor drive circuit that is disposed between the motor and the battery. The motor is a three-phase brushless motor, and the battery has a nominal voltage of 18 volts. An overall electric efficiency of the cordless electric power tool becomes at least 70 percent when a value of current passing through the motor becomes at least 35 amperes but no more than 45 amperes and the cordless electric power tool outputs power of at least 450 watts but no more than 550 watts.Type: GrantFiled: December 1, 2011Date of Patent: July 5, 2016Assignee: MAKITA CORPORATIONInventors: Kenya Yanagihara, Yoshitaka Ichikawa, Motohiro Omura