公开(公告)号：US11865924B2

公开(公告)日：2024-01-09

申请号：US17855367

申请日：2022-06-30

Applicant: MAKITA CORPORATION

Inventor： Ryo Umemoto ,  Hirokatsu Yamamoto

IPC: B60L15/20 ,  B62B5/00 ,  H02P3/22 ,  H02P5/74 ,  B60L15/30

CPC classification number: B60L15/2009 ,  B60L15/30 ,  B62B5/0036 ,  B62B5/0069 ,  H02P3/22 ,  H02P5/74 ,  B60L2240/425

Abstract: A cart may include a driving wheel, a motor configured to rotate the driving wheel, a motor drive circuit configured to drive the motor, a motor brake circuit configured to electrically brake the motor, a control device configured to control the motor via the motor drive circuit and the motor brake circuit so that a travelling speed of the cart becomes equal to or lower than an upper limit travelling speed, and a temperature sensor configured to detect a temperature of the motor brake circuit. The control device may be configured to change the upper limit travelling speed to a second upper limit travelling speed lower than the first upper limit travelling speed when the upper limit travelling speed is a first upper limit travelling speed and the temperature detected by the temperature sensor exceeds a first predetermined temperature.

公开(公告)号：US12187134B2

公开(公告)日：2025-01-07

申请号：US17854847

申请日：2022-06-30

Applicant: MAKITA CORPORATION

Inventor： Ryo Umemoto

IPC: B60L15/20 ,  B60L3/00 ,  B60L15/30 ,  B62B5/00 ,  B62B5/04 ,  B62D5/04

Abstract: A cart may include: a driving wheel; a motor configured to rotate the driving wheel; a motor drive circuit configured to control electric power supply to the motor; a motor control device configured to control the motor via the motor drive circuit; a switching element arranged on an electric power supply path to the motor drive circuit; a switch circuit arranged separately from the motor control device and configured to switch the switching element between a conduction state and a non-conduction state; and an operation member arranged on the cart and configured to be operated by a user. The cart may operate in a manual mode in which the motor is driven when the operation member is on and the motor is stopped when the operation member is off, and in an automatic mode in which the motor is driven regardless of whether the operation member is on or off.

公开(公告)号：US10422146B2

公开(公告)日：2019-09-24

申请号：US15742573

申请日：2016-03-11

Applicant: MAKITA CORPORATION

Inventor： Kunihisa Shima ,  Hirokatsu Yamamoto ,  Ryo Umemoto

IPC: E04G21/12 ,  B21F15/00 ,  B21F15/06 ,  B25B25/00

Abstract: A rebar tying device is configured to tie a plurality of rebars by a wire. The rebar tying device includes a feeder configured to feed the wire wound around a reel by a rotation of a feeding motor; a guide configured to guide the wire fed by the feeder to around the plurality of rebars; a cutter configured to cut the wire fed by the feeder at a predetermined position; a twister configured to twist the wire around the plurality of rebars; a battery configured to supply power to the feeding motor; and a control unit. The control unit configured to control a feeding length of the wire by controlling an energizing time of the feeding motor based on a predetermined feeding length of the wire.

公开(公告)号：US11533956B2

公开(公告)日：2022-12-27

申请号：US16629653

申请日：2018-05-22

Applicant: MAKITA CORPORATION

Inventor： Tsuyoshi Tanaka ,  Yuki Mizukoshi ,  Ryo Umemoto

IPC: G08B5/22 ,  A41D1/00 ,  G08B7/06 ,  G08B21/02 ,  B25F5/00

Abstract: A garment includes a garment body, a wear detection device configured to detect whether the garment body is worn by a worker, and a control device configured to output an alert signal for controlling an alert device based on detection data of the wear detection device.

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：US11897339B2

公开(公告)日：2024-02-13

申请号：US17856340

申请日：2022-07-01

Applicant: MAKITA CORPORATION

Inventor： Kunihisa Shima ,  Hitoshi Suzuki ,  Ryo Umemoto

IPC: B60L15/30 ,  B62B5/00 ,  B60L3/00 ,  B60L15/20 ,  H02P5/74 ,  H02P3/22

CPC classification number: B60L15/2009 ,  B62B5/0036 ,  H02P3/22 ,  H02P5/74 ,  B60L2240/421

Abstract: A cart may include: a driving wheel; a motor configured to rotate the driving wheel; a motor drive circuit configured to drive the motor; a motor brake circuit configured to electrically brake the motor; a rotation speed sensor configured to detect a rotation speed of the motor; and a control device configured to control the motor via the motor drive circuit and the motor brake circuit based on a target rotation speed of the motor and the rotation speed detected by the rotation speed sensor. The motor brake circuit may include an electronically variable resistance element configured to operate in a linear mode and a switching mode in response to a control input signal. The motor brake circuit may be configured to operate the electronically variable resistance element in the linear mode when braking the motor.

公开(公告)号：US10780563B2

公开(公告)日：2020-09-22

申请号：US15724766

申请日：2017-10-04

Applicant: MAKITA CORPORATION

Inventor： Yoshitaka Ichikawa ,  Hirokatsu Yamamoto ,  Ryo Umemoto ,  Kunihisa Shima

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

Abstract: An electric power tool according to one aspect of the present disclosure includes a main body, a motor, a tool holder configured to hold a tool bit, a hammer, a motion converter, a rotation transmitter, a first load detector, a second load detector, and a motor controller. The first load detector detects, based on information indicating a drive state of the motor, a load imposed from a work piece to the tool bit. The second load detector detects, based on information indicating a behavior of the main body, a load imposed from the work piece to the tool bit. The motor controller sets an upper limit of rotational speed of the motor to a predetermined no-load rotational speed in response to no-load on the tool bit being detected by both the first load detector and the second load detector.