公开(公告)号：US11325228B2

公开(公告)日：2022-05-10

申请号：US15948003

申请日：2018-04-09

Applicant: MAKITA CORPORATION

Inventor： Takaaki Osada ,  Hirokatsu Yamamoto ,  Goshi Ishikawa ,  Kunihisa Shima

IPC: B25B21/00 ,  B25F5/00 ,  B25B21/02 ,  B25B23/147

Abstract: A rotary impact tool in one aspect of the present disclosure includes a motor, an impact mechanism, an impact detector, and a controller. The controller executes constant duty ratio control from when the motor is started until an impact is detected by the impact detector. The controller executes constant rotation speed control in response to detection of an impact by the impact detector.

公开(公告)号：US11084157B2

公开(公告)日：2021-08-10

申请号：US16298409

申请日：2019-03-11

Applicant: MAKITA CORPORATION

Inventor： Kiyonobu Yoshikane ,  Yoshitaka Machida ,  Taro Hisano ,  Hirokatsu Yamamoto

IPC: B25D17/24 ,  B25D16/00

Abstract: A work tool includes a motor, a driving mechanism, a housing, a handle, a detecting mechanism and an elastic support part. The detecting mechanism is configured to detect information corresponding to an operating state of the work tool. The elastic support part supports the detecting mechanism so as to be movable relative to the housing in at least two of a front-rear direction, an up-down direction and a left-right direction. The elastic support part includes at least one elastic member disposed between the detecting mechanism and the housing. The elastic support part has respectively different spring constants in the at least two directions.

公开(公告)号：US10953524B2

公开(公告)日：2021-03-23

申请号：US15928788

申请日：2018-03-22

Applicant: MAKITA CORPORATION

Inventor： Masahiko Sako ,  Takaaki Osada ,  Hirokatsu Yamamoto

IPC: B25B21/02 ,  B25B23/147 ,  B25B23/14

Abstract: An impact fastening tool may include a motor; a hammer configured to be rotationally driven by the motor; an anvil configured to be hit in a rotational direction by the hammer; a signal obtainer configured to obtain a variable signal which varies in accordance with a hit to the anvil by the hammer; and a seating determiner configured to determine whether or not a fastener has been seated based on the variable signal obtained by the signal obtainer, wherein the seating determiner is configured to determine whether or not the fastener has been seated based on a signal component of the variable signal obtained by the signal obtainer, the signal component corresponding to a predetermined reference frequency.

公开(公告)号：US20250024775A1

公开(公告)日：2025-01-23

申请号：US18758368

申请日：2024-06-28

Applicant: MAKITA CORPORATION

Inventor： Tatsuya YOSHIKAWA ,  Hirokatsu Yamamoto

IPC: A01D34/00 ,  A01D101/00

Abstract: The working robot may include a working mechanism, a movement mechanism, a working motor, a movement motor, a battery configured to supply power to the working motor and the movement motor, a voltage detection unit configured to detect a voltage value of the battery, and a control unit. The control unit may be configured to obtain a detection value detected by the voltage detection unit while a target motor is in operation as a first-step voltage value, and then stop the target motor and obtain a detection value detected by the voltage detection unit while the target motor is not in operation as a second-step voltage value, and then determine whether to return the working robot to a charging station or not based on the first-step voltage value and the second-step voltage value. The target motor may be at least one of the working motor and the movement motor.

公开(公告)号：US11607789B2

公开(公告)日：2023-03-21

申请号：US17018079

申请日：2020-09-11

Applicant: MAKITA CORPORATION

Inventor： Hikaru Sunabe ,  Hirokatsu Yamamoto ,  Takaaki Osada

IPC: B25F5/00 ,  B25F5/02 ,  H02P29/00 ,  B25B21/00 ,  B25D16/00

Abstract: An electric working machine in one aspect of the present disclosure includes an output shaft, a motor, a housing, an acceleration detector, a twisted motion detector, a reference level changer, and a motor controller. The acceleration detector detects an acceleration of the housing in a circumferential direction of the output shaft. The twisted motion detector detects a twisted motion of the housing based on a reference level and the acceleration detected. The reference level determines that the housing is twisted. The reference level changer changes the reference level based on a rotating motion of the output shaft.

公开(公告)号：US10953532B2

公开(公告)日：2021-03-23

申请号：US15723757

申请日：2017-10-03

Applicant: MAKITA CORPORATION

Inventor： Hikaru Sunabe ,  Hirokatsu Yamamoto ,  Takaaki Osada

IPC: B25D16/00 ,  B25D17/20 ,  B25D17/24 ,  F21V33/00 ,  B25D11/00 ,  B25D17/04

Abstract: An electric power tool is configured to rotate an attachment about a Z-axis. The electric power tool includes a three-axes acceleration sensor and an acceleration detection circuit. The acceleration detection circuit calculates an angular acceleration about the Z-axis based on an input signal from the three-axes acceleration sensor. The acceleration detection circuit calculates a change in an angular velocity based on integrating the angular acceleration for a most recent period. The acceleration detection circuit determines a Z-axis angular velocity about the Z-axis, without adding a previous change in the angular velocity from before the most recent period, as equal to the change in angular velocity. The acceleration detection circuit detects a twisted-motion of the electric power tool based on the Z-axis angular velocity.

公开(公告)号：US10913141B2

公开(公告)日：2021-02-09

申请号：US15946029

申请日：2018-04-05

Applicant: MAKITA CORPORATION

Inventor： Hitoshi Iida ,  Masanori Furusawa ,  Hirokatsu Yamamoto ,  Ryo Umemoto ,  Yoshinori Sasaki ,  Akira Naito

IPC: B25D17/24 ,  B25D16/00 ,  B25D17/04

Abstract: An impact tool includes a motor, a driving mechanism, and a vibration sensor. The driving mechanism is configured to perform a hammering operation of linearly driving a tool accessory along an impact-axis by power of the motor. The impact-axis extends in a front-rear direction of the impact tool. The vibration sensor is configured to detect vibrations. The vibration sensor is disposed such that the vibration sensor is capable of detecting vibrations of a first frequency among vibrations caused in the impact tool, and such that transmission of vibrations of a second frequency to the vibration sensor is suppressed. The vibrations of the first frequency result from the hammering operation. The second frequency is different from the first frequency.

公开(公告)号：US09621081B2

公开(公告)日：2017-04-11

申请号：US14978697

申请日：2015-12-22

Applicant: MAKITA CORPORATION

Inventor： Yuki Kawai ,  Yoshitaka Ichikawa ,  Hirokatsu Yamamoto ,  Ying Yang

IPC: H02P27/04 ,  H02P6/00 ,  H02P6/14 ,  H02P27/08 ,  H02P6/15

CPC classification number: H02P6/157 ,  H02P6/085 ,  H02P6/14 ,  H02P27/08 ,  H02P2201/03

Abstract: A motor-driven apparatus in one aspect of the present disclosure includes: a brushless motor; a full-wave rectifier circuit; a drive circuit; a controller; and a forcible stop unit. The forcible stop unit performs a forcible stop control to temporarily forcibly stop a switching operation of a plurality of switching elements during a stop period when a full-wave rectified voltage is smaller than an induced voltage generated by a plurality of coils, and the switching operation of the plurality of switching elements is to be stopped.