Makita Corporation

Eiji Kondo

Hideyuki Taga

Hironori Ogura

Hidekazu Hayashi

Kazutoshi Ogino

Tomoyuki Kondo

Manabu Sugimoto

Miyabi Ito

Takuya Umemura

Yoshihiro Ishikawa

Hitoshi Suzuki

Shinsuke Okuda

Tomonobu Nashimoto

Akifumi Tomita

An electric working machine according to one aspect of the present disclosure includes a terminal block electrically connected to a battery pack. The terminal block includes a positive electrode connecting terminal and a negative electrode connecting terminal. The positive electrode connecting terminal includes a plate-shaped positive electrode side connection plate portion that comes in contact with a positive electrode terminal of the battery pack, and the negative electrode connecting terminal includes a plate-shaped negative electrode side connection plate portion that comes in contact with a negative electrode terminal of the battery pack. At least one of the positive electrode side connection plate portion and the negative electrode side connection plate portion is provided with a heat radiation plate portion in a thermal conductive manner.

Electric working machine with heat radiation plate portion integrally formed with connection plate portion connected to terminal of battery pack to radiate heat generated at connection plate portion

A battery pack () is configured to couple to a power tool () by sliding in a sliding direction and it contains a plurality of cells (). A pair of battery-side, electric-power terminals () and a battery-side signal terminal () can be electrically connected to a pair of tool-side, power-supply terminals () and a tool-side signal terminal (), respectively, which are provided on the power tool (). The pair of battery-side, electric-power terminals () and the battery-side signal terminal () are disposed in parallel adjacently in a direction that intersects the sliding direction.

Battery pack

A battery pack may include a drainage device provided at a bottom portion of the housing case. The drainage device may include a drain hole communicating between the inside and the outside of the housing case, so that water introduced into the housing case is discharged to the outside of the housing case. The drainage device may be disposed between two of the terminal members that are connected to electrodes of the battery cells.

As a cooling draft flows from a rear side to a front side of battery cells () inside a battery pack (), it is divided into two cooling drafts (F, F) in a left-right direction, which is the direction that the battery cells () are disposed in parallel, and those two cooling drafts respectively flow through a plurality of passageways that longitudinally extend along the battery cells (). More particularly, a second battery cell () is cooled by the cooling draft flowing in a second ventilation-path volume (Q) before a first battery cell () and a third battery cell () are cooled by cooling drafts respectively flowing in a first ventilation-path volume (Q) and a third ventilation-path volume (Q), which are longer than the second ventilation-path volume (Q).

A battery housing of a tool battery has a hook accommodation chamber and a battery cell accommodation chamber defined therein. A hook is accommodated within the hook accommodation chamber and is operable to lock and unlock the tool battery against a tool body of a power tool. Battery cells are disposed within the battery cell accommodation chamber. The hook accommodation chamber and the battery cell accommodation chamber are partitioned from each other.

Tool batteries

Battery

Three battery cells can be arranged such that one battery cell is situated on the front side of a handle portion and that the remaining two battery cells are situated on the rear side thereof while being arranged laterally side by side. Also, a handle portion can be generally of a triangular cross-sectional configuration whose apex portion is situated on the front side of the handle portion and whose base portion is situated on the rear side thereof; and the handle portion is grasped by bringing fingertips into contact with the apex portion () on the front side.

Handle portion of hand-held electric tool

A battery housing portion S includes regulating membersadapted to fit grooves of a battery pack having a T-shape cross section, so that the battery pack can be housed in the battery housing portion S in the state that the both regulating membersfit the grooves. The regulating membersregulate housing orientation of the battery pack, so that misjudgment about orientation of the battery packis prevented. In addition, if the orientation has been misjudged, an operator can notice such misjudgment immediately, thereby improving the operability during mounting the battery pack

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Anjo, Japan

Eiji Kondo