公开(公告)号：US10427282B2

公开(公告)日：2019-10-01

申请号：US15236718

申请日：2016-08-15

Applicant: MAKITA CORPORATION

Inventor： Goshi Ishikawa ,  Yoshihiro Ito ,  Toshihisa Takada

IPC: B25B23/147 ,  B25B21/02

Abstract: In a rotary impact tool according to an aspect of the present disclosure, an impact mechanism rotates an output shaft by a rotational force of a motor and, when a torque equal to or greater than a given value is externally applied to the output shaft in a direction opposite a rotational direction of the output shaft, the impact mechanism intermittently applies an impact force as a momentary torque to the output shaft in the rotational direction of the output shaft. A protection unit stops the motor or reduces a rotational speed of the motor on condition that an abnormal impact detection unit detects the abnormal impact. A control unit controls activation of the protection unit differently when the rotational direction of the motor is set to a reverse rotational direction in comparison with when the rotational direction of the motor is set to a forward rotational direction.

公开(公告)号：US10343268B2

公开(公告)日：2019-07-09

申请号：US14406045

申请日：2013-06-04

Applicant: MAKITA CORPORATION

Inventor： Tokuo Hirabayashi ,  Ryunosuke Kumagai ,  Takeshi Nishimiya ,  Goshi Ishikawa ,  Takuya Kusakawa

IPC: B25B23/14 ,  B25B21/02

Abstract: A rotary impact tool according to one aspect of the present invention includes a motor, an impact mechanism, a drive unit, an impact detection unit, and a control unit. The control unit reduces a driving force for the motor caused by the drive unit when a count of impacts detected by the impact detection unit has reached a determination count set in advance, which is a value greater than one.

公开(公告)号：US10322498B2

公开(公告)日：2019-06-18

申请号：US14885448

申请日：2015-10-16

Applicant: MAKITA CORPORATION

Inventor： Goshi Ishikawa ,  Ryunosuke Kumagai ,  Takuya Kusakawa ,  Yoshitaka Ichikawa ,  Tokuo Hirabayashi

IPC: B25B21/00 ,  B25B21/02 ,  B25B23/18

Abstract: An electric power tool in one aspect of the present disclosure comprises a motor, a hitting mechanism, a hitting detector, and a control unit. The control unit is configured to set a control amount of the motor so that the motor rotates at a lower speed than a speed in the target rotation state during an initial driving period, and switch the control amount to a final control amount corresponding to the target rotation state when the initial driving period elapses. The initial driving period is a period from when generation of a hitting force is detected by the hitting detector until a predetermined first time period elapses, after the motor is started driven.

公开(公告)号：US09853586B2

公开(公告)日：2017-12-26

申请号：US14801420

申请日：2015-07-16

Applicant: MAKITA CORPORATION

Inventor： Takuya Kusakawa ,  Goshi Ishikawa ,  Motohiro Omura

IPC: H02P27/04 ,  H02P27/06 ,  H02P29/024 ,  H02J7/00

CPC classification number: H02P27/04 ,  H02J7/0029 ,  H02J7/0063 ,  H02P27/06 ,  H02P29/0241 ,  H02P29/027

Abstract: 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.

公开(公告)号：US09438141B2

公开(公告)日：2016-09-06

申请号：US14540707

申请日：2014-11-13

Applicant: MAKITA CORPORATION

Inventor： Goshi Ishikawa ,  Itsuku Kato

IPC: H02P3/12 ,  B25F5/00

CPC classification number: H02P3/12 ,  B25F5/00

Abstract: One aspect of an embodiment of the present disclosure is a braking apparatus for an electric power tool that includes a switching circuit with six switching elements and a brake control unit. The brake control unit switches any one selected switching element of three switching elements forming one selected switch group of a high-side switch group and a low-side switch group to an off state from an on state at a timing at which braking current flows through a diode connected in parallel to the selected switching element upon turn-off of the selected switching element.

Abstract translation: 本公开的实施例的一个方面是一种用于电动工具的制动装置，其包括具有六个开关元件的切换电路和制动控制单元。 制动控制单元将在制动电流流过的定时处，将形成高侧开关组和低侧开关组的一个选择的开关组的三个开关元件的任何一个选择的开关元件从接通状态切换 在选择的开关元件断开时与所选择的开关元件并联连接的二极管。