Koki Holdings Co., Ltd.

Ryosuke Nakano

Yoshikazu Yokoyama

Ken Inui

Naoki Tadokoro

Yasutaka Shimizu

Tomoaki Sudo

Tetsuya Monzen

Chisho So

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

A power tool includes a prime mover, an output shaft that extends along a first direction and retains a tip tool and is driven by the prime mover, a support member that supports the output shaft to be drivable, a gear that rotates around an axis extending in a second direction crossing the first direction and transmits a power of the prime mover to the output shaft, and a gear cover that accommodates the gear and the support member. Inside the gear cover, a lubricant retention portion capable of retaining a lubricant is arranged at a side of the support member, and the lubricant retention portion is partitioned from a gear accommodation portion that accommodates a gear by a wall extending in a direction intersecting an extending direction of the output shaft in the gear cover.

Working machine

A powered tool includes a housing, a drive source, a drive body, a sealing part, and a holding part. The drive source is rotatable in the housing. The drive body is supported in the housing and reciprocatable by a driving force of the drive source. The sealing part is in contact with an outer peripheral surface of the drive body. The holding part is positioned around the drive body. The holding part surrounds the sealing part and supports the sealing part to be in contact with the outer peripheral surface of the drive body. The holding part includes a lubrication oil accommodating part retaining a lubricant supplied to the outer peripheral surface of the drive body.

Powered tool

There is provided a power tool in which impact applied to a power transmission portion can be mitigated to thereby suppress components constituting the power transmission portion from being deformed and damaged. The power tool includes a brushless motorhaving a rotation shaft portionrotatable about a rotation axis A, a housingaccommodating therein the brushless motor, a power transmission portionconfigured to receive a rotation force of the rotation shaft portionand to transmit a driving force based on the rotation force, and a driven portionconfigured to be driven by receiving the transmitted driving force. The rotation shaft portionis supported by the housingso as to be movable relative to the housingin an axial direction of the rotation axis A

Power tool

Providing a reciprocating tool capable of reducing vibrations generated during operations and improving work performance and processing precision. A reciprocating tool includes a transmission gear partand a counter weight part. The transmission gear partincludes a bevel gearand a weightA. The bevel gearis rotatable in a first direction about an axis B by receiving a drive force of a motor. The weightA is rotatable in a second direction opposite to the first direction about the axis B by receiving the drive force of the motor. A center of gravityG of the transmission gear partand a center of gravityG of the counter weight partare separated farthest from a blade mounting partwhen the blade mounting partis positioned in a rearward position. The center of gravityG of the transmission gear partand the center of gravityG of the counter weight partare closest to the blade mounting partwhen the blade mounting partis positioned in a forward position.

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Hitachinaka, Japan

Ryosuke Nakano