Makita Corporation

Kazutoshi Ogino

Hideyuki Taga

Hidekazu Hayashi

Hironori Ogura

Eiji Kondo

Hitoshi Suzuki

Tsuyoshi Murayama

Kiyozumi Kokowa

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.

Battery pack

One aspect according to the present invention includes a battery pack and a shock absorbing device interposed between a battery cell holder and a case body and capable of keeping the battery cell holder and the battery cells not to directly contact with an inner surface of the case body.

Battery pack including a shock absorbing device and arrangement of circuit boards

Battery pack including a shock absorbing device, an air flow plate and an air flow passage

Battery pack including a shock absorbing device

To inform a user of wear on a carbon brush for a motor earlier than when the carbon brush is actually required to be replaced with a new brush. In a motor brush wear indicating device, a metal terminal is attached to a brush holder, being opposed to the inside of a holder shank of the brush holder, and an indicator is operated when the metal terminal contacts a brush spring. The metal terminal has a contact in the middle of a length of the brush holder. The indicator can be operated while the carbon brush is continuously pressed against a commutator by the brush spring. The metal terminal serves as a leaf spring. When the carbon brush is worn and shortened, the indicator is operated. Even after the indicator operates, the carbon brush is still pressed against the commutator by the brush spring. Therefore, the user can operate a motor-driven tool for some time before the carbon brush must be replaced with a new one.

Device for indicating wear on a motor brush

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Anjo, Japan

Kazutoshi Ogino