Abstract: A circular saw includes (i) a circular saw blade that is pivotally connected to a rotary shaft and driven to rotate by way of the rotary shaft, (ii) a tool body that supports the rotary shaft and has a fixed guard covering an upper portion of the circular saw blade, (iii) a movable guard pivotally connected to the rotary shaft and closing in a normal state a cutting region of the circular saw blade, and (iv) an elastic connecting member, including a first point connected to the tool body and a second point connected to the movable guard. The movable guard, under the action of an external force, is capable of opening the cutting region. The elastic connecting member includes a rectilinearly stretching segment connected to the first point and a first torsional connecting segment connected to the second point. The rectilinearly stretching segment has a coil spring, and the first torsional connecting segment is a non-coil spring connecting member.

Abstract: A portable power tool includes a motor housing and a motor mounted in the motor housing. The motor includes a rotary spindle. The portable power tool also includes a trigger configured to be actuated and released to switch on and off the motor. The portable power tool also includes a mechanical brake assembly connected with the trigger and automatically operated by the trigger. Accordingly, the brake assembly releases the spindle when the trigger is activated and brakes the spindle when the trigger is released.

Abstract: The disclosure relates to a transmission for a power tool, comprising an input gear driven by a driver, an intermediate shaft carrying first and second intermediate gears, the first intermediate gear being meshed with the input gear, an output shaft carrying an output gear, the output gear being meshed with the second intermediate gear for driving a tool bit, and proximal and distal bearings supporting proximal and distal ends of the intermediate shaft respectively. The first intermediate gear is formed with a receptacle portion which is recessed from a proximal end surface of the first intermediate gear in an axial direction towards a distal side, the proximal bearing being received in the receptacle portion at least in part in the axial direction. The disclosure also relates to a power tool comprising the above transmission. The disclosure provides a compact and robust structure.

Abstract: A portable power tool includes a motor housing and a motor mounted in the motor housing. The motor includes a rotary spindle. The portable power tool also includes a trigger configured to be actuated and released to switch on and off the motor. The portable power tool also includes a mechanical brake assembly connected with the trigger and automatically operated by the trigger. Accordingly, the brake assembly releases the spindle when the trigger is activated and brakes the spindle when the trigger is released.

Abstract: A circular saw includes a base plate defining a base plane, a bevel bracket which supports a circular saw blade and is pivotally mounted on the base plate for tilting the blade, the bevel bracket having a pivoting axis which is parallel to the base plane and the blade and perpendicular to a rotational axis of the blade, and the blade partly extending through an opening forming in the base plate, and an anti-splinter device for preventing cutting chips from splintering. The anti-splinter device comprises a pair of slides mounted in the opening and forming a gap between their opposing ends, an outcoming section of the blade passing through the gap, and slide driving means associated with the bevel bracket and driving the slides to move in conformity with the tilting of the blade to allow the gap to accommodate the positional change of the outcoming section of the blade.