Hitachi Koki Co., Ltd.

Koki Holdings Co., Ltd.

Hiroki Uchida

Tomomasa Nishikawa

Masanori Okada

Takeshi Taniguchi

Katsuhiro Oomori

Yoshiki Aoki

Akira Onose

Hideyuki Tanimoto

Yoshihiro Nakano

Takashi Ozawa

Tetsuhiro Harada

Nobuhiro Takano

Masato Sakai

Kazutaka Iwata

Atsushi Nakagawa

Yoshihiro Komuro

Mizuho Nakamura

Hironori Mashiko

Hiroyuki Hasegawa

Hayato Yamaguchi

Saroma Nakano

Chikai Yoshimizu

Junichi Toukairin

Rui Akiba

Yuji Kishima

Takeshi Takeda

Yutaka Ito

Junichi Tokairin

Atsushi Sumi

Yuko Tazawa

Hiroki Tsunoda

Katsuaki Sukegawa

Kazuhiko Morita

A power tool includes: a motor; a fan driven by the motor and defining an axis and a radial direction; and a housing for accommodating the motor and the fan therein, the housing including: a peripheral wall formed with a ventilation hole; and a grid partly covering the ventilation hole, the ventilation hole being positioned adjacent to the fan and having a shape defined by a circumferential surface, the grid including at least one elongated portion extending in a longitudinal direction perpendicular to the radial direction, and a distance from the axis of the fan to the circumferential surface is different from a distance from the axis of the fan to one elongated portion in the radial direction of the fan.

Power tool

An electric device body in which a battery pack including a plurality of battery cells and a plurality of first terminals is detachably mounted includes: a housing; a guide mechanism; and a plurality of second terminals; and a pressed portion. The battery pack is configured to be attached to and detached from the housing along a first direction. The guide mechanism is provided at the housing and configured to define the first direction. The plurality of second terminals is configured to be connected to the plurality of first terminals upon attachment of the battery pack to the housing. The pressed portion is configured to be pressed against the battery pack in a second direction intersecting the first direction when the battery pack has been attached to the housing.

Electric device body 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

According to an aspect of the invention, an electric power tool which includes a brushless direct-current motor and a drive circuit that supplies drive power to the motor, and which rotates or drives a tool, characterized in that the drive circuit includes plural switching elements, and is arranged on a board provided in a grip portion of a housing or below the grip portion; and an electric fan is provided in the vicinity of the switching element for cooling the switching element.

Electric power tool

A power tool () and a method of producing such power tool capable of improving dust proof performance with respect to a circuit board () and a stator coil (B), and capable of securing cooling performance to the circuit board. The power tool includes a brushless motor () having a hollow stator (), a rotor () positioned in an internal space of the stator, and a motor driver circuit connected to the stator. The stator includes a coil (B) electrically connected to the motor driver circuit. The coil is coated with a coating agent (D), and the motor driver circuit is covered with an insulation cover member (D).

Power tool and method for producing the same

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.

Portable electric driver

An electric power tool () includes a brushless direct-current motor () and a drive circuit that supplies drive power to the motor, the power tool rotates or drives a tool, whereby the drive circuit includes plural switching elements (), and is arranged on a board () provided in a grip portion of a housing or below the grip portion; and an electric fan () is provided in the vicinity of the switching element for cooling the switching element.

To provide a cordless power tool which can suppress heat generation of a protection unit and prevent the erroneous operation. A cordless power toolincludes a body casing; a batterywhich is detachably attached to the body casingand can supply electric power; a motorwhich is housed in the body casing, and generates rotation force by the electric power of the battery; a cooling fanwhich rotates by the rotation force of the motor; and a protection unitwhich shuts off the power supply to the motor, in accordance with a detection result of the state of the battery, so that the batterydoes not enter an overdischarge state or an overcurrent state. Herein, a passage of cool air generated by the cooling fanis formed in the body casing, and theprotection unitis arranged so that at least its part is located in the passage of the cool air.

Cordless power tool

A power tool including: a base slidable on a workpiece, and an opening provided through the base; a main unit supported to the base and movable in a first direction substantially perpendicular to the base, the main unit including an electric motor; a cutter driven by the electric motor, the cutter being capable of protruding through the opening from the base; a stopper pole supported to a housing coupled to the main unit, the stopper pole being movable in the first direction, the stopper pole having one end protruding from the housing toward the base, thereby regulating a moving distance of the cutter; a digital display unit including a moving distance detection portion for detecting a moving distance of the stopper pole and a digital display portion for displaying the moving distance; and a dust prevention member provided between a part of the stopper pole protruding toward the base and the moving distance detection portion, thereby preventing dust from entering into the housing.

A power tool has a base, a main unit, a cutter, a bolt, an engagement member, and a unit. The base has a sliding surface slidable on a workpiece, another surface opposite to the sliding surface, and an opening in the base. The main unit is movable in a first direction substantially perpendicular to the sliding surface. The cutter is driven by a electric motor in the main unit to protrude through the opening from the sliding surface during an operation. The bolt extends in the first direction on the first side, a first male thread, and one end supported by the base. The bolt is rotatable about the longitudinal axis. The engagement member has a first female thread threadably engaged with the male thread. The engagement member is movable between an engaged position with the boot and a disengaged position therewith. The unit maintains the engagement member at the disengaged position in a second direction. The rotation of the bolt causes the first male thread portion to thread with respect to the first male thread portion, thereby moving the main unit in the first direction and adjusting a distance of the main unit to the sliding surface.

Jig saw

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Hitachinaka, Japan

Hiroki Uchida