Koki Holdings Co., Ltd.

Hitachi Koki Co., Ltd.

Ken Miyazawa

Ryo Suzuki

Toshiaki Koizumi

Naoki Tadokoro

Hironori Sakai

Hajime Kikuchi

A work tool includes: a motor; a housing including a gripping part; an electronic switch; a controller controlling the motor based on a signal from the switch; an operating part provided at the gripping part; and an intervening part movably intervened between the operating part and the switch. The switch is provided at the housing at a first position in an axial direction of the gripping part, and is switchable between an ON position for driving the motor and an OFF position for stopping the motor. A direction connecting the ON position and the OFF position to each other is a crossing direction crossing the axial direction. The operating part is movable in the crossing direction to drive and stop the motor. The intervening part transmits movement to the switch by a moving amount smaller than movement in the crossing direction of the operating part passing through the first position.

Work tool

An electric tool is provided which enables preventing adherence to a rotor core of dust, such as iron powder, that has entered a motor. The electric tool includes a cylindrical motor housingaccommodating and supporting the motor, and a cooling fan attached to a rotation shaft of the motor, and cools the motor by flowing air generated by the cooling fan toward the back or front of the motor housing, wherein a fan guideguiding cooling air is provided in front of an insulatorof a statorof the motor. The fan guideincludes a first cylindrical partwhich covers a rotation space of the cooling fan, a guide surface, and a second cylinderwhich extends backward from the guide surface, wherein a labyrinth spaceis formed by the insulatorand the second cylinder. By providing the labyrinth space, it is possible to block the flow of cooling air from the outer peripheral side of the statorto an opening

Electric tool

Provided is an electrically powered tool configured so that a handle section is rotatable relative to a body section, wherein a motor housing is formed in a cylindrical integral structure, and a first drive circuit on which a switching element is mounted is received from a rear opening. The first drive circuit is disposed within a circular cylindrical case open to the rear side. A handle housing is provided with an air flow window, and a gear case is provided with a discharge opening. When a cooling fan rotates, air is sucked into the handle housing from the air flow window. Then, as indicated by the arrow, the air cools, within the motor housing, the switching element mounted on the first derive circuit, then cools the motor, and is discharged to the outside from the discharge opening.

Electrically powered tool

Provided is an electrically powered tool having an improved sensor substrate mounting structure, the electrically powered tool being configured so that a brushless type motor is axially contained in a cylindrical housing. The electrically powered tool has: a cylindrical housing for axially containing a motor; a control unit for controlling the motor; and a sensor substrate having mounted thereon a plurality of position detecting elements for detecting the rotational position of a rotor. The sensor substrate is gripped between the insulator of the motor and the housing and held on the housing side when axially mounting the motor. The sensor substrate is annularly shaped and has formed at the center thereof a through-hole through which a bearing for the motor is passed. The portion of the sensor substrate, on which a Hall IC is mounted, is provided with a synthetic resin cover member for protecting the Hall IC against dust.

A power tool includes a motor, an impact mechanism, an output unit, a circuit board, a housing, and a power cord. The circuit board includes a power-source circuit board configured to convert alternate current into direct current and a control circuit board. The housing includes a body section, a board accommodating section, and a handle section. The board accommodating section accommodates the circuit board. The handle section has one end portion connected to the body section and another end portion connected to the board accommodating section. The power cord extends from the board accommodating section. The power cord is positioned opposed to the handle section with respect to the board accommodating section. The control circuit board is located at a position close to the handle section in the board accommodating section. The power-source circuit board is located between the control circuit board and the power cord.

Growing community of inventors

Ibaraki, Japan

Ken Miyazawa