Mobiletron Electronics Co., Ltd.

Jui-Chen Huang

Tung-Chin Kuo

Shih-hao Wang

A protective device of a power tool includes a fixing base having a tube portion and an abutting surface, a restricting ring fitting around the tube portion, several springs disposed between the abutting surface and a first end of the restricting ring, a protective cover having several second projections and several second recesses, and a locking member. The first end has an abutting portion. A second end of the restricting ring has several first projections and several first recesses matching with the second projections and the second recesses. The restricting ring is located between the protective cover and the abutting surface. When a blocking portion of the locking member moves to a first position, the blocking portion restricts the restricting ring from moving toward the abutting surface. When the blocking portion moves to a second position, the blocking portion leaves a position between the abutting surface and the abutting portion.

Protective device of power tool

A power tool includes a case, a motor, a plurality of Hall effect sensors, a first circuit board, and a second circuit board. The Hall effect sensors detect a position of a rotor of the motor and correspondingly generate position signals. A plurality of commutating switches and a first controller are disposed on the first circuit board. A second controller is disposed on the second circuit board, and could transmit a driving signal to the first controller according to the operating signal of an operator interface. The first controller regulates the commutating switches to commutate according to the driving signal and the position signals, thereby to activate the rotor to rotate. With such design, a commutation process and a user operating process are regulated by the two different controllers, which could efficiently simplify the program code installed in each of the controllers and facilitate the maintenance of the controllers.

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Taichung, Taiwan

Jui-Chen Huang