Hitachi Koki Co., Ltd.

Koki Holdings Co., Ltd.

Takuhiro Murakami

Junichi Toukairin

Masayuki Ogura

Tomomasa Nishikawa

Shota Takeuchi

Kazuhiko Funabashi

Akira Matsushita

Shinji Watanabe

Yasushi Nakano

Masaru Hirano

Nobuhiro Takano

Hiroyuki Hanawa

Toshio Mizoguchi

Takuya Teranishi

Shota Kanno

Hiroto Inagawa

Hayato Yamaguchi

Junichi Kamimura

Osamu Kawanobe

Satsuo Sato

Yusuke Funabiki

Junpei Sato

Hikaru Tamura

Masanori Okada

Takafumi Itoh

Yoshikazu Yokoyama

Mitsuo Ogura

Mitsuyuki Ishikawa

Naoya Eto

Yoshimitsu Kawasaki

Naoto Wakatabe

Juurou Kobayashi

Takeshi Taniguchi

Katsuhiro Oomori

Shinki Ohtsu

Hiroki Kitagawa

Haruhisa Fujisawa

Yoshihiro Komuro

Hideki Watanabe

Hironori Mashiko

Kunio Yamamoto

Hiroyuki Hasegawa

Yuta Noguchi

Kengo Tamura

Norihide Tao

The electrical apparatus, in which a series connection state and a parallel connection state of an upper cell unit including five battery cells and a lower cell unit can be automatically switched by means of a difference in a terminal shape on the electrical apparatus body side, has a terminal holder and holds apparatus side terminals. The terminal holder, which establishes an electrically connected state with the connection terminals of the battery pack, is provided with two parallel protruding parts that extend in the forward-backward direction, and second rail grooves fitted to the protruding parts on the electrical apparatus side. Due to the fitting, relative movement of the terminal holder and the battery pack in the vertical direction can be suppressed, and wear on the apparatus side terminals can be greatly suppressed.

Electrical apparatus using battery pack

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

Provided is an electric device capable of suppressing vibration of a battery pack. Included are: a first housingaccommodating a load portion that consumes electric power; a second housinghaving one end portion connected to the first housingand another end portion to which a battery packis connectable; and an elastic memberinterposed between the first housing and the second housing. The first housing includes a first restricting portionpositioned away from the elastic member, and the second housing includes a second restricting portionpositioned away from the elastic member and engageable with the first restricting portion. In a case where the second housing is urged to be separated from the first housing, the elastic member is deformed and the first restricting portion and the second restricting portion are engaged with each other to prevent separation.

Electric 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.

In order to provide an impact work machine capable of preventing oil leakage and cooling a power transmission apparatus, an impact work machine transmitting power of an electric motorincluding an output shaft extending in an axis Adirection to an anvil includes: a housing including a motor case accommodating the electric motor, and a grip extending from the motor case; a speed reducer and an impact mechanismeach transmitting power of the electric motor to the anvil; a hammer case located forward of the motor case and nonrotatable relative to the motor case; an extension portion provided on the housing and extending from the motor case toward the hammer case so as to cover at least part of the hammer case; and a passage provided between the hammer case and the extension portion and through which air passes.

Work machine

In order to provide an impact tool which is capable of increasing a striking force in a rotational direction of being applied from a hammer to an anvil, the impact tool includes: an electric motor; an anvil which supports a work tool and is driven by the electric motor; and a hammer which applies the striking force in the rotational direction to the anvil. The impact tool is provided with: a spindle which is arranged to be concentric with the anvil, supports the hammer to be movable in an axial direction and the rotational direction with respect to the anvil, and transmits motive power of the electric motor to the anvil; and a control unit which controls rotation speed of the electric motor. The number of strokes of the anvil due to one rotation of the hammer differs in response to rotation speed of the electric motor.

Impact tool

A power supply device includes a main body, a cover member, a rechargeable battery, and an inverter device. The main body is configured of box-shape formed with an opening. The cover member is configured to open and close the opening. The rechargeable battery is accommodated in the main body. The inverter device is configured to be accommodated in the main body. The inverter device converts a direct voltage from the battery to an alternating voltage and outputs the alternating voltage.

Power supply device

A portable working machine is provided with a wheel guard partially covering a wheel rotated by a drive source such as an engine, and the wheel guard is retained by a retaining portion of an arm via rubber dampers serving as elastic members. Concave-convex portions are formed on the rubber dampers, a convex-concave portion corresponding to the concave-convex portions is formed in the wheel guard side, and the wheel guard is retained by the arm so that the concave-convex portions are engaged with the convex-concave portion.

Portable working machine

Battery pack

An impact tool comprising a motor, a hammerthat is rotated and axially moved by a drive force of the motor, an anvilthat repeats engagement/disengagement from the hammeraccompanying rotation and axial movements of the hammer, and a tip toolmounted to the anvil, the anvilcomprising a first split pieceA, which includes pawls(first concave-convex part) on an opposite side to the hammer and repeats engagement/disengagement from the hammer, a second split pieceB, which includes pawls(second concave-convex part) engageable with the pawls (first concave-convex part)of the first split pieceA in a direction of rotation, and to which the tip toolis mounted, and a rubber damper (elastic body)interposed between the first and second split piecesA,B to prevent direct contact between the pawls (first concave-convex part)and the pawls (second concave-convex part)in the direction of rotation and in an axial direction.

A method for fixing a driver blade to a piston of a fastener driving tool having a housing, a cylinder, a piston having a piston body and a boss with a groove, extending in the axial direction, and a driver blade having a pair of protrusions. The method includes positioning the driver blade above the piston body, inserting the driver blade into the groove in order to form an assembly of the driver blade and the piston, supplying a brazing metal onto boundary positions between the protrusions and the boss, and heating the assembly at a temperature above a melting point of the brazing metal so that molten brazing metal is flowed downwardly into spaces between the boss and the driver blade and the driver blade becomes fixed to the piston by brazing with the brazing metal.

Driving tool having piston and driver blade

A nailing machine, in which a part constituting a nose is changed so as to increase the service life of a driver blade for driving a nail. The nailing machine includes a nose having a nose hole in which the nail is supplied, and the driver blade made of metal. At least a part of a surface of the nose hole to be in contact with a front surface of the driver blade is provided with a protective body. The protective body is made of an organic material or a composite material of an organic material and a metal material. Due to this, direct mutual contact of the metal parts is prevented.

Nailing machine

Disclosed is an electric power tool having a gear mechanism, which reduces a noise by absorbing collision of gears and is resistible to a high torque. A power transmission keycomposed of high-strength plastic is provided between an output shaftand a gearand a plane or a V-groove is formed on each of the output shaftand the gearcontacting the power transmission key

Electric power tool

Growing community of inventors

Ibaraki, Japan

Takuhiro Murakami