Patents by Inventor Yuki Kawai
Yuki Kawai 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: 12038060Abstract: The present invention provides a flexible member having excellent load resistance and flexibility while achieving a reduction in size. This flexible member is provided with: a main body part which includes multiple wave washers that are stacked in an axial direction and are joined to one another by multiple joint parts, and which is capable of bending relative to the axial direction by elastic deformation of the wave washers; and easily deformable parts formed between the joint parts that are adjacent to one another in the circumferential direction in each wave washer.Type: GrantFiled: April 13, 2020Date of Patent: July 16, 2024Assignee: NHK SPRING CO., LTD.Inventors: Yosuke Kawai, Shimpei Kurokawa, Yuki Hayakawa
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Patent number: 11962257Abstract: A blower in one aspect of the present disclosure includes: a housing including a first discharge port; a motor in the housing; a fan in the housing; an attachment fitting portion; and a motor drive circuit. The attachment fitting portion is configured to detachably attach, to the first discharge port, an attachment including a second discharge port. The motor drive circuit (i) delivers a designated power to the motor and (ii) performs a constant power control that maintains a magnitude of an electric power delivered to the motor at a magnitude of the designated power.Type: GrantFiled: August 29, 2022Date of Patent: April 16, 2024Assignee: MAKITA CORPORATIONInventors: Yuki Kawai, Naoya Asami
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Patent number: 11932235Abstract: A hybrid vehicle control method controls a hybrid vehicle having an electric power source, a vehicle electrical equipment and drive motor to which electric power is supplied from the electric power source. The vehicle electrical equipment and the drive motor are electrically connected to the electric power source via at least a shared harness. When a temperature of the harness is equal to or greater than a predetermined temperature, upper limit values of electric power supplied from the electric power source to the vehicle electrical equipment and the drive motor are both reduced, and a degree of reduction in the upper limit value for the vehicle equipment is greater than a degree of reduction in the upper limit value for the drive motor.Type: GrantFiled: August 19, 2020Date of Patent: March 19, 2024Assignee: Nissan Motor Co., Ltd.Inventors: Sadaharu Narita, Yuki Kawai, Shunsuke Baba
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Publication number: 20230071190Abstract: A blower in one aspect of the present disclosure includes: a housing including a suction port and a discharge port; a motor in the housing; a fan in the housing; a motor drive circuit; and a control circuit. The control circuit detects an insufficient airflow from the suction port to the discharge port based on an operation parameter. The operation parameter is associated with an operation of the motor.Type: ApplicationFiled: August 30, 2022Publication date: March 9, 2023Applicant: MAKITA CORPORATIONInventors: Yuki KAWAI, Naoya ASAMI
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Publication number: 20230075030Abstract: A blower in one aspect of the present disclosure includes: a housing including a first discharge port; a motor in the housing; a fan in the housing; an attachment fitting portion; and a motor drive circuit. The attachment fitting portion is configured to detachably attach, to the first discharge port, an attachment including a second discharge port. The motor drive circuit (i) delivers a designated power to the motor and (ii) performs a constant power control that maintains a magnitude of an electric power delivered to the motor at a magnitude of the designated power.Type: ApplicationFiled: August 29, 2022Publication date: March 9, 2023Applicant: MAKITA CORPORATIONInventors: Yuki KAWAI, Naoya ASAMI
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Patent number: 11571099Abstract: An interlocking adapter in one aspect of the present disclosure includes a current path, an electric load, a switch, and a controller. The controller turns on and off the switch in synchronization with a change of an alternating-current voltage received from an electric outlet of an electric apparatus in response to reception of an interlocking command signal from a working machine so as to supply a load current from the electric outlet to the electric load. The controller turns on and off the switch at a specified ratio of a time every ½ cycle of the alternating-current voltage.Type: GrantFiled: December 22, 2020Date of Patent: February 7, 2023Assignee: MAKITA CORPORATIONInventors: Hitoshi Suzuki, Yuki Kawai, Itsuku Kato, Yasutaka Hotta
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Patent number: 11554409Abstract: A rebar tying tool (2; 302; 402) include a feed mechanism (24), which includes a first motor (32; 304) and feeds a wire (W), and a twisting mechanism, which includes a second motor (76; 306) and twists together one or more portions of the wire. A control unit (202; 350) controls the first motor and the second motor and includes a general-purpose I/O port (202c; 350c) and a motor-control-signal output port (202a; 350a). A motor-control-signal-output-destination-switching circuit (204; 310; 406) inputs motor-control signals (UH, VH, WH, UL, VL, WL) from the control unit via the motor-control-signal output port and selectively outputs the inputted motor-control signals to either the first motor or the second motor in response to input of a switching signal (SW).Type: GrantFiled: December 8, 2020Date of Patent: January 17, 2023Assignee: MAKITA CORPORATIONInventors: Shunta Mizuno, Masahiro Watanabe, Yuki Kawai
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Patent number: 11529669Abstract: A rebar tying tool includes: a feed mechanism (24), which includes a first brushless motor (32) and performs an advancing process that advances a wire (W) and a draw-back process that draws back the wire (W); a first inverter circuit (212), which is electrically connected to the first brushless motor; and a control unit (202), which controls the first brushless motor via the first inverter circuit. The first brushless motor comprises a first Hall-effect sensor (180), which is disposed on a first sensor board (178). In the advancing process, the control unit performs lead-angle control on the first brushless motor at a first lead angle. In the draw-back process, the control unit performs lead-angle control on the first brushless motor at a second lead angle. The first lead angle is set to be larger than the second lead angle.Type: GrantFiled: December 8, 2020Date of Patent: December 20, 2022Assignee: MAKITA CORPORATIONInventors: Shunta Mizuno, Yuki Kawai
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Publication number: 20220371577Abstract: A hybrid vehicle control method controls a hybrid vehicle having an electric power source, a vehicle electrical equipment and drive motor to which electric power is supplied from the electric power source. The vehicle electrical equipment and the drive motor are electrically connected to the electric power source via at least a shared harness. When a temperature of the harness is equal to or greater than a predetermined temperature, upper limit values of electric power supplied from the electric power source to the vehicle electrical equipment and the drive motor are both reduced, and a degree of reduction in the upper limit value for the vehicle equipment is greater than a degree of reduction in the upper limit value for the drive motor.Type: ApplicationFiled: August 19, 2020Publication date: November 24, 2022Inventors: Sadaharu NARITA, Yuki KAWAI, Shunsuke BABA
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Patent number: 11509129Abstract: An electric working machine according to one aspect of the present disclosure comprises a motor, a rectifier circuit, a capacitor, a series switching element, a resistive element, a drive circuit, a peak voltage value acquirer, and a controller. The capacitor smooths power rectified by the rectifier circuit. The series switching element is coupled in series with the capacitor. The resistive element is coupled in parallel with the series switching element. The controller brings the series switching element into conduction in a case where AC power is inputted to the rectifier circuit and where a specified conducting condition based on a peak voltage value acquired by the peak voltage value acquirer is satisfied.Type: GrantFiled: April 15, 2020Date of Patent: November 22, 2022Assignee: MAKITA CORPORATIONInventors: Yuki Kawai, Itsuku Kato
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Patent number: 11466466Abstract: An electric power tool disclosed herein may include an actuator; a control unit; and a main switch. When the main power is on, the control unit may be capable of executing at least one sequence operation in which the actuator is operated according to a predetermined sequence. When the operation to switch the main power from on to off is performed on the main switch during execution of the at least one sequence operation: the main power may be kept on and electric power supply to the actuator may be continued until the at least one sequence operation under execution is completed; and the electric power supply to the actuator may be cut off and the main power may be switched from on to off after the at least one sequence operation under execution has been completed.Type: GrantFiled: February 5, 2019Date of Patent: October 11, 2022Assignee: MAKITA CORPORATIONInventors: Yuki Kawai, Kunihisa Shima
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Patent number: 11149451Abstract: A tying machine may include a feeding mechanism configured to feed a tying string, a battery, and a voltage detection circuit configured to detect a voltage of the battery. The feeding mechanism may include a feeding motor to which power is supplied from the battery. The tying machine may be configured to set a duty ratio for driving the feeding motor when feeding the tying string, in accordance with the voltage of the battery detected by the voltage detection circuit.Type: GrantFiled: December 17, 2018Date of Patent: October 19, 2021Assignee: MAKITA CORPORATIONInventors: Kunihisa Shima, Yuki Kawai
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Patent number: 11117185Abstract: A fastening tool includes a housing, a fastener-abutment part, a pin-gripping part held within the fastener-abutment part to be movable in a front-rear direction relative to the fastener-abutment part, a detection-target part provided to move together with the pin-gripping part, a detection device configured to detect the detection-target part, a motor, and a driving mechanism configured to move the pin-gripping part rearward from an initial position relative to the fastener-abutment part. The driving mechanism is further configured to move the pin-gripping part forward relative to the fastener-abutment part so as to return the pin-gripping part to the initial position based on a detection result of the detection device. The fastening tool is configured such that a first moving distance is adjustable, the first moving distance being a distance by which the pin-gripping part is moved from a detection position to the initial position.Type: GrantFiled: June 8, 2018Date of Patent: September 14, 2021Assignee: MAKITA CORPORATIONInventors: Michisada Yabuguchi, Yuki Kawai, Hiroki Ikuta
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Patent number: 11065674Abstract: A fastening tool includes a fastener-abutment part, a pin-gripping part, a motor, a driving mechanism, an input-accepting part and a motor-control part. The fastener-abutment part is configured to abut on a cylindrical part of a fastener. The pin-gripping part is configured to grip a portion of a pin of the fastener. The driving mechanism is configured to be driven by power of the motor to move the pin-gripping part rearward along a driving axis relative to the fastener-abutment part, thereby fastening a workpiece via the fastener. The input-accepting part is configured to accept setting information for a control condition of the motor inputted via an operation part configured to be externally operated by a user. The motor-control part is configured to control operation of the driving mechanism by controlling driving of the motor according to the control condition based on the setting information accepted by the input-accepting part.Type: GrantFiled: November 24, 2017Date of Patent: July 20, 2021Assignee: MAKITA CORPORATIONInventors: Yuki Kawai, Michisada Yabuguchi, Hiroki Ikuta, Toshihito Yabunaka
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Patent number: 11045861Abstract: A fastening tool includes a bolt-gripping part, an anvil, a motor, and a control part. When the bolt-gripping part grips an end region of a shaft part and moves relative to the anvil in a first direction of a longitudinal-axis direction, the anvil presses a collar fitted onto the shaft part in a second direction opposite to the first direction of the longitudinal-axis direction and inward in a radial direction of the collar, so that a hollow part of the collar is crimped to a groove while the workpiece is clamped between the collar and a head part, whereby swaging of a fastener is completed while the end region remains integrated with the shaft part. The control part completes swaging of the fastener by terminating a movement of the bolt-gripping part in the first direction relative to the anvil based on driving current of the motor.Type: GrantFiled: November 24, 2017Date of Patent: June 29, 2021Assignee: MAKITA CORPORATIONInventors: Yuki Kawai, Michisada Yabuguchi, Hiroki Ikuta, Toshihito Yabunaka
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Publication number: 20210180347Abstract: A rebar tying tool includes: a feed mechanism (24), which includes a first brushless motor (32) and performs an advancing process that advances a wire (W) and a draw-back process that draws back the wire (W); a first inverter circuit (212), which is electrically connected to the first brushless motor; and a control unit (202), which controls the first brushless motor via the first inverter circuit. The first brushless motor comprises a first Hall-effect sensor (180), which is disposed on a first sensor board (178). In the advancing process, the control unit performs lead-angle control on the first brushless motor at a first lead angle. In the draw-back process, the control unit performs lead-angle control on the first brushless motor at a second lead angle. The first lead angle is set to be larger than the second lead angle.Type: ApplicationFiled: December 8, 2020Publication date: June 17, 2021Inventors: Shunta MIZUNO, Yuki KAWAI
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Publication number: 20210178454Abstract: A rebar tying tool (2; 302; 402) include a feed mechanism (24), which includes a first motor (32; 304) and feeds a wire (W), and a twisting mechanism, which includes a second motor (76; 306) and twists together one or more portions of the wire. A control unit (202; 350) controls the first motor and the second motor and includes a general-purpose I/O port (202c; 350c) and a motor-control-signal output port (202a; 350a). A motor-control-signal output-destination-switching circuit (204; 310; 406) inputs motor-control signals (UH, VH, WH, UL, VL, WL) from the control unit via the motor-control-signal output port and selectively outputs the inputted motor-control signals to either the first motor or the second motor in response to input of a switching signal (SW).Type: ApplicationFiled: December 8, 2020Publication date: June 17, 2021Inventors: Shunta MIZUNO, Masahiro WATANABE, Yuki KAWAI
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Publication number: 20210106194Abstract: An interlocking adapter in one aspect of the present disclosure includes a current path, an electric load, a switch, and a controller. The controller turns on and off the switch in synchronization with a change of an alternating-current voltage received from an electric outlet of an electric apparatus in response to reception of an interlocking command signal from a working machine so as to supply a load current from the electric outlet to the electric load. The controller turns on and off the switch at a specified ratio of a time every 1/2 cycle of the alternating-current voltage.Type: ApplicationFiled: December 22, 2020Publication date: April 15, 2021Applicant: MAKITA CORPORATIONInventors: Hitoshi SUZUKI, Yuki KAWAI, Itsuku KATO, Yasutaka HOTTA
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Patent number: 10954947Abstract: A backpack-type blower according to one aspect of the present disclosure includes a plurality of fans, a plurality of DC power supplies and a backpack. The plurality of fans and the plurality of DC power supplies are mounted on the backpack. The backpack-type blower is configured to blow winds from the plurality of fans together.Type: GrantFiled: April 19, 2016Date of Patent: March 23, 2021Assignee: MAKITA CORPORATIONInventors: Hirokatsu Yamamoto, Yuki Kawai, Makoto Takahashi
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Patent number: 10898041Abstract: An interlocking adapter in one aspect of the present disclosure includes a current path, an electric load, a switch, and a controller. The controller turns on and off the switch in synchronization with a change of an alternating-current voltage received from an electric outlet of an electric apparatus in response to reception of an interlocking command signal from a working machine so as to supply a load current from the electric outlet to the electric load. The controller turns on and off the switch at a specified ratio of a time every ½ cycle of the alternating-current voltage.Type: GrantFiled: December 26, 2018Date of Patent: January 26, 2021Assignee: MAKITA CORPORATIONInventors: Hitoshi Suzuki, Yuki Kawai, Itsuku Kato, Yasutaka Hotta