Hitachi Koki Co., Ltd.

Koki Holdings Co., Ltd.

Yuji Kishima

Takuya Yoshinari

Haruhisa Fujisawa

Shingo Kosugi

Takeshi Takeda

Akihiro Kobayashi

Kazuhiko Funabashi

Masanori Okada

Yoshiki Aoki

Eiji Nakayama

Junichi Toukairin

Toshio Mizoguchi

Rui Akiba

Hiroki Uchida

Yoshihiro Komuro

Takashi Takeda

Takafumi Itoh

Naoto Ichihashi

Tetsuya Monzen

Ibuki Kanda

Daisuke Nitawaki

Yasuoki Kawahata

Jun Enta

Takuya Kataoka

Kazuki Noguchi

Naoto Wakatabe

Provided is an electrical device. In a setting unit, a right-room temperature display unit displays a set temperature or the current temperature of a first housing room. A left-room temperature display unit displays a set temperature or the current temperature of a second housing room. A right-room temperature setting button is an operation unit for a user to switch the set temperature of the first housing room. A left-room temperature setting button is an operation unit for a user switch the set temperature of the second housing room. The set temperature difference between the first and second housing rooms is controlled to be within a prescribed value. When the set temperature of one of the first and second housing rooms is changed so that the set temperature exceeds a prescribed value, a microcomputer automatically changes the other set temperature so that the set temperature difference is within a prescribed value.

Electric device

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

A DC power supply device includes a first conversion unit connected to an AC power supply, a second conversion unit connected to an electric tool, and a cable connecting the first conversion unit and the second conversion unit to each other. The first conversion unit includes a power factor correction circuit, converts an AC voltage having a first voltage value, input from the AC power supply, into a DC voltage having a second voltage value higher than the first voltage value, and outputs the DC voltage having the second voltage value to the cable. The second conversion unit converts the output voltage of the first conversion unit, input via the cable, into a DC voltage having a third voltage value lower than the second voltage value, and outputs the DC voltage having the third voltage value to the electric tool.

DC power supply device

A DC power supply device includes a housing including a wall portion, a first opening and a second opening, a circuit portion, a regulation wall portion, and a fan. The first and second openings are formed in the wall portion. The circuit portion includes first and second circuit elements those fixed within the housing. The regulation wall portion provide a first air passage in communication with the first opening, a second air passage in communication with the second opening, and a bent air passage allowing the first air passage and the second air passage to communicate with each other. The fan is configured to generate an air-flow flowing between the first air passage and the second air passage. The fan is positioned to face the first opening. The first circuit element is positioned in the first air passage. The second circuit element is positioned in the second air passage.

Provided is a DC power supply device If an electrical tool () of a rated voltage of 36 V is connected to the DC power supply device () (if the voltage of a lower positive terminal indicates the presence of a short bar), a microcomputer () performs control so as to switch a switching element (Q) on and output a DC voltage of 36 V between an upper positive terminal and the upper negative terminal. If an electrical tool () of a rated voltage of 18 V is connected to the DC power supply device () (if the voltage of the lower positive terminal indicates the absence of a short bar), the microcomputer () performs control so as to switch a switching element (Q) on and output a DC voltage of 18 V between the upper positive terminal and the upper negative terminal.

A battery charger that is configured to charge a battery pack including a secondary battery includes: a housing; and a charging circuit unit disposed in the housing. The housing defines a first air passage in which air flows to cool the secondary battery and a second air passage in which air flows to cool the charging circuit unit. The second air passage is independent from the first air passage.

Battery charger capable of efficiently cooling secondary battery in battery pack and charging circuit unit in battery charger

Battery pack

An electric tool including: a motor; a housing including, a motor housing accommodating the motor, and a handle housing having one end connected to the motor housing and another other end configured to be provided with a detachable battery pack; an output part partially accommodated in the motor housing and configured to be driven by the motor; and a control board accommodated in the motor housing and configured to control the motor.

Electric tool

A backpack-type power supply includes: a plurality of cell units () each configured of a plurality of secondary battery cell (); a case () configured to accommodate the cell units and having first and second contacts; and a harness () attached to the case, characterized by including; first connecting means () for electrically connecting the first contact and a positive terminal of each cell unit to form a first electrical path therebetween; and second connecting means () for electrically connecting the second contact and a negative terminal of each cell unit to form a second electrical path therebetween, each first electrical path and each second electrical path forming a total electrical path having a total resistance for each cell unit, the total resistance of each total electrical path being adjusted such that heat distribution is substantially uniform over the plurality of cell units in the case.

Backpack-type power supply

Rechargeable battery

An electric power tool includes: a motor including a motor shaft; a tip tool driven by the motor; a housing that houses the motor; a switching element for driving the motor; and a bearing that can retain the motor shaft. The switching element is provided so as to overlap with the bearing in a direction of the motor shaft inside the housing.

Electric power tool

Growing community of inventors

Hitachinaka, Japan

Yuji Kishima