Koki Holdings Co., Ltd.

Satoshi Abe

Tomomasa Nishikawa

Kazutaka Iwata

Hideyuki Hashimoto

Shingo Yamazaki

Takahiro Ookubo

Akira Matsushita

Atsuyuki Kikuchi

Kuniaki Kanbe

Daijiro Tanabe

Takehiro Ookubo

Kento Shiina

A workability of a driving work machine is improved by reduction in vibration transmitted to a housing. A driving work machineincludes: a cylinderapplying a rotational force to a tip tool; a pistonapplying a striking force to the tip tool; a driving source generating a power; a switching partmaking switching between at least two operational states including a rotational striking state of transmitting the power as a striking force and a rotational force to the tip tool and a rotational state of transmitting the power as the rotational force but not transmitting the power as the striking force to the tip tool; and a housing. The cylinderincludes a pushing partpushing the switching partrearward, the switching partis able to switch an operational state of the cylinderby the rearward movement caused by the pushing force of the pushing part, and a rubber annular memberserving as an anti-vibration part is arranged between the pushing partand the preventing part

Driving work machine

The present invention provides an electric working machine in which a control board can be disposed without limitations based on a length of a brushless motor in a direction along an axial line. The electric working machine comprises: a brushless motor provided with a rotor and a stator; a motor case and a motor housing in which the brushless motor is stored; a control board which is provided outside of the motor housing in a radial direction of an axial line defined at the center of the rotor, and supports the switching elements; a connection board which is provided in the motor case, and supports the sensors; a through hole provided on the motor case; a through hole provided on the motor housing; and leads and signal lines extending from inside of the motor housing to the outside of the motor housing through the holes.

Electric working machine

An impact tool that realizes an ON-lock function with a simple mechanism and makes it possible to switch between activation and deactivation of the ON-lock function with few operation processes is provided. A hammer drill having at least two operating modes including a hammer mode in which an impact force is transmitted to a tool bit whereas a rotational force is not transmitted thereto includes: a motor as a power source; a trigger lever and an ON-lock button that are operated by an operator; a sensor that detects whether a selected operating mode is the hammer mode or not; and a controller that controls the motor based on an operation of the trigger lever and the ON-lock button. When the ON-lock button is operated while the hammer mode is selected, the controller performs ON-lock control to maintain the motor in the operating state even when the trigger lever is not operated.

Impact tool

An electric power tool has a brushless motor for driving a tip tool, and a motor case is at least partly covered by a motor housing made of aluminum alloy and exposed to an outside. A control board provided with a control circuit for controlling the rotation of the brushless motor is disposed adjacent to the motor housing. The brushless motor and a control board are cooled by cooling air generated by a fun, thereby enhancing the cooling characteristics of the motor control circuit.

Power-actuated tool

Growing community of inventors

Ibaraki, Japan

Satoshi Abe