Koki Holdings Co., Ltd.

Tomoaki Sudo

Kazuhiko Funabashi

Kazutaka Iwata

Takao Aradachi

Eiji Nakayama

Yoshikazu Kawano

Yukihiro Shima

Yasushi Nakano

Naoki Tadokoro

Yuta Noguchi

Ryosuke Nakano

Kenichi Takaada

Ken Inui

Shinichi Sakuma

Chisho So

Kenichi Hoshino

A working tool and a drilling method capable of improving workability are provided. A working tool includes a motor, a trigger switch to instruct the driving of the motor, and a microcontroller to control the driving of the motor. The microcontroller stops the motor without transitioning to a retry mode when detecting a rapid increase of a motor current. The microcontroller transitions to the retry mode when detecting an overload without accompanying the rapid increase of the motor current. In the retry mode, the activation and stop of the motor are repeated. When the load applied to a tool bit is eliminated during execution of the retry mode, the microcontroller returns to a normal mode while the trigger switch is kept on.

Working tool and drilling method

Provided is a work machine capable of improving workability. The work machine is provided with: a motor; a first power supply unitconnected to a battery packand supplying a boosted power to the motor; and a second power supply unitconnected to an external AC power supply and supplying a boosted power to the motor. The voltage and current of the first power supply unitand the voltage and current of the second power supply unitcan be variably controlled by a control circuitand a control circuit, respectively. The control circuitsperform control so that the power output from the respective first power supply unitand the second power supply unitis combined and supplied to the motor

Work machine

Provided is a work tool that can work suitably in cooperation with an attachment device connected to a main body of the work tool to enhance work efficiency. The work tool includes a main body, and a control circuitconfigured to provide control over the main body. The main bodyincludes a motor, an end-bit mount portionand an end bitas a work part configured to be driven by the motorto perform a work. A dust collectoris connectable to the main bodyto assist the work. The control circuitis configured to detect whether the dust collectoris connected to the main bodyand change the control over the main bodybased on whether the connection is established or not.

Work tool

A power tool includes a motor, a connecting unit, and a controller. The connecting unit is configured to be connected to a secondary battery. A voltage detection unit is configured to detect a voltage of the secondary battery connected to the connecting unit. The controller is configured to acquire change of the detected voltage. The controller restricts the operation of the motor when the change of the voltage is a first value.

Power tool

Growing community of inventors

Hitachinaka, Japan

Tomoaki Sudo