Hitachi Koki Co., Ltd.

Koki Holdings Co., Ltd.

Nobuhiro Takano

Kazuhiko Funabashi

Takao Aradachi

Tomomasa Nishikawa

Kazutaka Iwata

Yoshikazu Kawano

Chikai Yoshimizu

Kenrou Ishimaru

Katsuhiro Oomori

Eiji Nakayama

Kenro Ishimaru

Hidekazu Harada

Hideyuki Tanimoto

Shinji Watanabe

Hiromi Ozawa

Takeshi Takeda

Hiroyuki Hanawa

Toshio Mizoguchi

Hayato Yamaguchi

Hideaki Terashima

Shigeru Shinohara

Yasushi Nakano

Masayuki Ogura

Haruhisa Fujisawa

Akira Matsushita

Junichi Toukairin

Mizuho Nakamura

Takuhiro Murakami

Yoshio Iimura

Hironori Mashiko

Osamu Kawanobe

Masaru Hirano

Eisaku Oka

Atsushi Nakagawa

Hiroki Uchida

Takuya Teranishi

Tomoyuki Kawahara

Toshiaki Koizumi

Shota Kanno

Shota Takeuchi

Yutaka Ito

Yuki Horie

Tetsuhiro Harada

Masateru Niyada

Hiroyuki Saitou

Shigeru Moriyama

Yusuke Funabiki

Hikaru Tamura

Yuuichi Konuma

Junpei Sato

Saroma Nakano

Naoto Wakatabe

Shinki Ohtsu

Yoshitaka Akiba

Kenichirou Yoshida

Yoshihiro Komuro

Yukihiro Shima

Toshihiko Tachibana

Naoki Tadokoro

Mitsuo Ogura

Shinichirou Satou

Miyoji Onose

Keita Saitou

Nobuhito Hosokawa

Hiroshi Haga

Shigeru Takahashi

Yuuichi Satou

Atsushi Sumi

Shinki Otsu

Kazuhiro Funabashi

Yoshihiro Hoshi

Shiniki Otsu

Shinji Watabe

A battery pack houses first and second cell units that are composed of a plurality of cells, and has a positive electrode power source terminal and a negative electrode power source terminal. This battery pack is provided with a series connector capable of connecting, in series, the first and second cell units and a parallel connector capable of connecting, in parallel, the first and second cell units, and is capable of switching between a parallel connection voltage and a series connection voltage. In the case of attachment to the high voltage electrical device body, the series connector becomes conductive and the parallel connector pair is cut off by the action of the series/parallel switching terminal. In the case of attachment to a low voltage electrical device body, the state is returned to an initial state, the series connector is cut off, and the parallel connector pair becomes conductive.

Battery pack, electrical device using battery pack, and electrical device system

In order that the output voltage of a battery pack can be switched and the battery pack can be shared among different voltage electric appliances, this battery pack has a switching mechanism that switches outputting a low voltage by parallel connection of two cell units or outputting a high voltage by series connection of the two cell units, said two cell units each being composed of a plurality of cells connected in series, wherein the switching mechanism is configured from a change-over switch having an operation lever (452). The change-over switch is embedded in a battery pack (400), and an operator is able to manually switch outputting 18 V by setting the operation lever (452) at a first position or outputting 36 V by setting the operation lever (452) at a second position.

Battery pack, and electric appliance using battery pack

In an upper cell unit () and a lower cell unit () comprising five battery cells, positive electrode terminals () are set apart and aligned vertically, and negative electrode terminals () are set apart and aligned vertically. When an electrical device body is rated at 36V, device-side terminals are in contact only at the upper terminals (), and short circuiting of the lower terminals () is effected using a short bar. When the electrical device body is rated at 18V, the upper and lower terminals (andand) are simultaneously made to contact the device-side terminals, and the upper cell unit () and the lower cell unit () assume a parallel connected state. Thus, it is possible to automatically switch the output voltage when a battery pack is mounted according to the difference in terminal shape on the electrical device body side.

When a main switch () is turned ON, an electric operating machine () is put in the standby mode. With a trigger () being pulled in the standby mode, a power supply circuit () applies a voltage to a drive part (). The power supply circuit () adjusts the voltage applied to the drive part () for a voltage corresponding to the pulling rate of the trigger (). When the current running toward the drive part () exceeds the rated value of the drive part (), the power supply circuit () automatically stops power supply to the drive part (). On the other hand, when the output voltage of a battery () drops and the battery () is put in an overdischarge state, power supply to the drive part () is automatically stopped. When it is detected that the battery () undergoes an abnormal event, power supply to the drive part () is automatically stopped.

Electric operating machine

An electric tool including a motor configured to be driven by a PWM control of a semiconductor switching element by using a power supply, a power transmission mechanism configured to transmit a rotation of the motor to an end tool, and a controller configured to control a rotation of the motor by a duty ratio of a PWM signal, wherein the controller is configured to set the duty ratio to a reference duty ratio less than 100% when a voltage of the power supply applied to the electric tool is within a predetermined range including a rated voltage of the electric tool, and wherein the controller is configured to drive the motor by setting the duty ratio to be higher than the reference duty ratio when the voltage of the power supply applied to the electric tool is lower than the predetermined range.

Electric tool

A power tool includes: a secondary battery; a drive unit; a detecting unit; and a control unit. The secondary battery has positive and negative terminals across which a battery voltage is developed. The drive unit is connected to the secondary battery. The detecting unit is configured to detect a current value and a voltage value supplied from the secondary battery to the drive unit. The control unit is configured to control an effective voltage and an effective current applied to the drive unit depending on a load imposed thereon to fall within an allowable power dissipation value.

Power tool

A power tool includes a motor and control means for controlling the motor. The motor is capable of being driven by power supplied from a battery pack including a battery cell. The control means is configured to continue to rotate the motor even when a motor-halt signal is inputted from the battery pack. With this structure, the power tool can be used continuously without need to halt rotation of the motor, even when receiving a halt signal, such as an overdischarge detection signal or an overcurrent detection signal.

Power tool and battery pack

The purpose of the present invention is to use a motor with as high an output as possible to complete tightening operations at a high speed while limiting continuous drive output. In a power tool having a plurality of impact operation modes, the motor thereof is controlled at a 100% duty cycle so as to rotate at a high speed in the period between pulling of a trigger and starting of an impact operation (-), and the duty cycle is changed to a low duty cycle matching the appropriate operation mode after an impact by an impact mechanism is started and a predetermined stroke is performed so that the motor is driven at the low duty cycle until the trigger is returned (arrow-). The switching of the duty cycle is performed when the current flowing to the motor exceeds a threshold (I).

An electric tool includes: a motor configured to be driven by PWM controlling a semiconductor switching element; a trigger configured to adjust startup and rotation of the motor; a changeover switch configured to switch a rotation direction of the motor between a forward rotation and a reverse rotation; a power transmission mechanism configured to rotate a tip tool by the motor, and a controller configured to control rotation of the motor. When the reverse rotation is set by the changeover switch, the controller PWM controls the semiconductor switching element at a high duty ratio after the trigger is pulled to drive the motor, and thereafter drives the motor at a state where the high duty ratio is changed to a low duty ratio.

The present invention reduces or shuts off output electric power of a battery pack, which is connected to an electric device, depending on an abnormality. According to the present invention, a battery pack is detachably connected to an electric-device main body having a switch, and includes a first electric-power control circuit that outputs a first signal to the electric-device main body when the switch is operated, the first signal for allowing supply of electric power to the electric-device main body, a second switching element provided on an electric-power supply path that supplies electric power to the electric-device main body, and a second electric-power control circuit that outputs a second signal to the second switching element if an abnormality occurs in the battery pack, the second signal for reducing or shutting off the electric power supplied to the electric-device main body.

Battery pack and electric device

According to an aspect of the present invention, there is provided an impact tool including: a motor; a hammer connected to an output portion of the motor; and an anvil to be struck by the hammer in a rotation direction and having a rotary shaft, the hammer striking the anvil in the rotation direction by driving the motor in pulses, wherein the anvil is provided in front of the hammer, wherein the hammer is driven in pulses by the motor, and wherein a rotation angle of the hammer is substantially proportional to a rotation angle of the motor.

Impact tool

An impact tool () includes a motor (); a hammer () having a rotational axis extending in a first direction, the hammer () being rotatable in a rotational direction including a forward direction and a reverse direction opposite to the forward direction by the motor () and being movable in the first direction and a second direction opposite to the first direction; an anvil () disposed at the first direction side of the hammer () and strikable by the hammer () in the forward direction, the hammer () that has been struck the anvil () being moved in the second direction to come free from the anvil (); and a fixing member (A,A) that selectively allows the hammer () to move in the second direction or prevents the hammer () from moving in the second direction.

A power tool system includes: a power tool including an AC motor; a portable battery pack; and a power supply device that converts a DC power supplied from the portable battery pack into an AC power to supply the AC power to the AC motor.

Power tool system and power supply device

According to an aspect of the present invention, there is provided an impact tool including: a motor drivable in an intermittent driving mode; a hammer connected to the motor; an anvil to be struck by the hammer to thereby rotate/strike a tip tool; and a control unit that controls a rotation of the motor by switching a driving pulse supplied to the motor in accordance with a load applied onto the tip tool.

An electric grasscutter includes a motor () which drives a rotary blade (). The motor () is a brushless motor accommodated in a motor housing () and including a rotor () provided integrally with an output shaft (), and a stator () fixed to the motor housing (). A motor control circuit which drives the motor () is accommodated in the motor housing (). The motor control circuit includes an inverter having FETs (-) as switching elements, and a control section to control the FETs (-). The FETs (-) are fixed in contact with the motor housing ().

Work machine and brushless motor

Growing community of inventors

Hitachinaka, Japan

Nobuhiro Takano