Koki Holdings Co., Ltd.

Hironori Sakai

Yuuki Takeda

Hironori Mashiko

Takuya Yoshinari

Ken Miyazawa

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

An electric tool includes a housing; a brushless motor, housed in the housing; an output shaft configured to hold a tip tool; a switching circuit controlling the brushless motor; a circuit board; a case, accommodating the circuit board, the case is filled with a resin, wherein the resin covers at least a part of the circuit board; the housing includes a motor housing element and a cover element covering at least a part of the case. The motor housing element includes a motor housing part accommodating the brushless motor, and a fixing part, configured to fix the case to the motor housing by the fixing part abutting the case.

Electric tool

Provided is a rotary tool. In the rotary tool, the rotating tip tool is mounted on a spindle by the fixture, and the spindle and the tip tool are rotated by a motor. The rotary tool has a switch which can switch the motor between a rotation state and a stop state, and a control device which controls the rotation of the motor corresponding to the operation of the switch. When the switch is turned off after a required time T elapses after the motor is started, the control device stops the rotary tool () by performing a common braking operation on the spindle, and when the switch is turned off before the required time T elapses after the motor is started, the control device stops the tip tool () by inertia without applying a braking force.

Rotary tool

Provided is an electric tool in which the risk of short-circuiting between conductive members of multiple installed switching elements has been reduced by providing partitioning plates between the switching elements. An electric tool, which has a motor, an inverter circuit with multiple switching elements for performing switching operations and controlling the driving of the motor, a control unit for controlling switching element on-off operations, and a circuit board on which the switching elements are loaded, is configured so that the circuit board is housed inside a container-shaped case () and the circuit board is secured with a partitioning member () that is interposed between the multiple switching elements and has partitioning plates () obtained from an insulating material.

Growing community of inventors

Ibaraki, Japan

Hironori Sakai