Hitachi Koki Co., Ltd.

Koki Holdings Co., Ltd.

Tetsuya Monzen

Masanori Okada

Yoshiki Aoki

Shinichi Kakefuda

Shingo Kosugi

Masayuki Ogura

Yuji Kishima

Ryosuke Nakano

Akihiro Kobayashi

Provided is a charging device including a plurality of battery pack connection parts, the charging device capable of performing appropriate charging when charging is performed while switching a charging target battery pack. A microcomputercan alternatively execute a first mode and a second mode as a control mode when the battery pack is connected to a plurality of the battery pack connection partsto. In the first mode, the charging target battery packs are switched before being fully charged and sequentially charged. In the second mode, the charging target battery packs are fully charged and then switched and charged. At each switching, the type or the state of the charging target battery pack is detected.

Charging device having two charging modes

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.

Reciprocating tool

Portable electric driver body

Portable electric driver

Growing community of inventors

Hitachinaka, Japan

Tetsuya Monzen