Hitachi Koki Co., Ltd.

Koki Holdings Co., Ltd.

Hayato Yamaguchi

Tomomasa Nishikawa

Hideyuki Tanimoto

Nobuhiro Takano

Akira Matsushita

Kenichirou Yoshida

Takuhiro Murakami

Masayuki Ogura

Shinji Kuragano

Osamu Kawanobe

Masaru Hirano

Kazuhiko Funabashi

Katsuhiro Oomori

Kazutaka Iwata

Hiroyuki Hanawa

Atsushi Nakagawa

Shinji Watanabe

Toshio Mizoguchi

Junichi Toukairin

Hiroki Uchida

Yasushi Nakano

Takuya Teranishi

Mizuho Nakamura

Hironori Mashiko

Shota Kanno

Shota Takeuchi

Yusuke Funabiki

Junpei Sato

Hikaru Tamura

Saroma Nakano

Naoto Wakatabe

Chikai Yoshimizu

Takuya Konnai

Yutaka Ito

Tatsuya Ito

Masashi Takehisa

Yuki Ishikawa

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 the work device that has a self-holding circuit () maintaining power supply from a power supply circuit () by output from a microcomputer () and has a structure in which stopping output to the self-holding circuit () causes interruption of power supply from the power supply circuit () to the microcomputer (), the firmware of the microcomputer () is made to be rewritable and a power holding unit (condenser C) for temporarily continuing power supply to the microcomputer () is provided, thereby realizing a so-called 'off-delay timer function' for restarting the microcomputer (). This configuration enables maintenance of power to the microcomputer () after update of the firmware even in a work device that cannot be restarted once power has been turned off unless trigger operation is performed, thereby enabling automatic restart of the microcomputerafter resetting is enabled.

Work device

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.

A portable electric cutter includes a housing in which a motor is accommodated, a saw blade driven to rotate by the motor, a base coupled to the housing and having a bottom surface slidable on a surface of a material to be cut, a fan driven to rotate by the motor, a driving circuit for switching power supplied to the motor, and a control circuit for controlling the driving circuit. A circuit board on which the driving circuit, the control circuit and others are mounted is provided, motor cooling air vents are provided in the housing on a side opposite to the saw blade, and circuit board cooling air vents are provided in the housing on the side opposite to the saw blade.

Portable electric cutter

A portable electric cutter includes a housingin which a motoris accommodated, a saw blade driven to rotate by the motor, a basecoupled to the housingand having a bottom surface slidable on a surface of a material to be cut, a fandriven to rotate by the motor, a driving circuit for switching power supplied to the motor, and a control circuit for controlling the driving circuit. A circuit boardon which the driving circuit, the control circuit and others are mounted is provided, motor cooling air vents are provided in the housingon a side opposite to the saw blade, and circuit board cooling air vents are provided in the housingon the side opposite to the saw blade.

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

In a brushless motor, a rotor core is fixed to a shaft. Through holes are formed in the rotor core, and permanent magnets are inserted to be fixed in place in the through holes. A stator core is fixed to an outer circumferential surface of the rotor core such that the stator core faces the outer circumferential surface of the rotor core. Stator coils are provided on the stator core via insulators so as to configure magnetic flux generating portions. A cooling fan is provided in front of a stator which is configured by the stator core and the stator coils. Axial position of blades of the fan and axial positions of the rotor core and the permanent magnets partially overlap each other in their positions.

Brushless motor and electric-powered tool

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.

A power tool includes a housing, an electric motor accommodated in the housing, a secondary battery that supplies electric power to the electric motor, a handle provided at the housing, a trigger switch provided at the handle for controlling electric power supply to the electric motor, a residual capacity display for displaying a residual capacity of the secondary battery, and a lock-release switch provided at the handle and configured to allow the trigger switch to be operable and to start displaying the residual capacity at the residual capacity display upon manipulation to the lock-release switch.

Power tool having display that displays residual capacity of battery

Growing community of inventors

Ibaraki, Japan

Hayato Yamaguchi