A safety system for a power miter saw comprises a support member, at least one multidirectional manipulator including a workpiece holder member moveably mounted to the support member for securing a workpiece in place, and a control box. The workpiece holder member includes a presence indicator operatively connected to the control box and configured to detect the physical presence of a saw operator's hand on the at least one multidirectional manipulator when the saw operator's hand engages the presence indicator. The control box is operatively connectable to a trigger switch of the power miter saw so that an electric motor of the power miter saw is activated only when both the presence indicator of the safety system and the trigger switch of the power miter saw are engaged by both hands of an operator of the power miter saw.

A dust-collecting cover for an electric circular saw includes a dust-collecting cover body configured as a cavity structure thereinside. A bottom surface of a cavity is formed with a strip-shaped opening, which is used for a saw blade to pass therethrough. Other surfaces of the cavity are configured as closed structures. An airflow passage is automatically formed in the cavity during operation. A pathway of the airflow passage starts from a part of the rear end of the strip-shaped opening adjacent to saw teeth, to a front end of the strip-shaped opening in an arc shape along the outer edge of the saw blade, then turns upwards and rearwards, and along an upper wall of the cavity, then turns downwards, and stops at a part of the rear end of the strip-shaped opening away from the saw blade. A dust-collecting method is disclosed.

A dust-collecting cover for an electric circular saw includes a dust-collecting cover body configured as a cavity structure thereinside. A bottom surface of a cavity is formed with a strip-shaped opening, which is used for a saw blade to pass therethrough. Other surfaces of the cavity are configured as closed structures. An airflow passage is automatically formed in the cavity during operation. A pathway of the airflow passage starts from a part of the rear end of the strip-shaped opening adjacent to saw teeth, to a front end of the strip-shaped opening in an arc shape along the outer edge of the saw blade, then turns upwards and rearwards, and along an upper wall of the cavity, then turns downwards, and stops at a part of the rear end of the strip-shaped opening away from the saw blade. A dust-collecting method is disclosed.

A handheld, hand-guided cutting-off machine, which includes a rotating cutting-off wheel, a supporting housing part (36), an output shaft (20), which is rotatably supported around an output axis (40), a drive motor, a transmission mechanism (19), which connects the drive motor to the output shaft (20), a flange (41) and a safety guard (24), which covers the cutting-off wheel over a covering area (25). The cutting-off wheel is rotatably fixedly mounted on the output shaft (20) with the aid of the flange (41) and surrounded by the safety guard (24). The safety guard (24) is pivotable around a pivot axis, and the pivot axis is displaced by a distance from the output axis (40) of the output shaft (20).

A handheld, hand-guided cutting-off machine, which includes a rotating cutting-off wheel, a supporting housing part (36), an output shaft (20), which is rotatably supported around an output axis (40), a drive motor, a transmission mechanism (19), which connects the drive motor to the output shaft (20), a flange (41) and a safety guard (24), which covers the cutting-off wheel over a covering area (25). The cutting-off wheel is rotatably fixedly mounted on the output shaft (20) with the aid of the flange (41) and surrounded by the safety guard (24). The safety guard (24) is pivotable around a pivot axis, and the pivot axis is displaced by a distance from the output axis (40) of the output shaft (20).

A handheld, hand-guided cutting-off machine (10), which includes a rotating cutting-off wheel, a supporting housing part (36), an output shaft, which is rotatably supported around an output axis (40), a drive motor, a transmission mechanism (19), which connects the drive motor to the output shaft, a flange and a safety guard (24), which covers the cutting-off wheel over a covering area. The cutting-off wheel is rotatably fixedly mounted on the output shaft with the aid of the flange and surrounded by the safety guard (24), which is pivotable around a pivot axis. The safety guard (24), the supporting housing part (36) and the transmission mechanism (19) have maximum distances from the output axis (40) over an outcut angle (?), which are less than or equal to half the flange diameter of the flange.

A handheld, hand-guided cutting-off machine (10), which includes a rotating cutting-off wheel, a supporting housing part (36), an output shaft, which is rotatably supported around an output axis (40), a drive motor, a transmission mechanism (19), which connects the drive motor to the output shaft, a flange and a safety guard (24), which covers the cutting-off wheel over a covering area. The cutting-off wheel is rotatably fixedly mounted on the output shaft with the aid of the flange and surrounded by the safety guard (24), which is pivotable around a pivot axis. The safety guard (24), the supporting housing part (36) and the transmission mechanism (19) have maximum distances from the output axis (40) over an outcut angle (?), which are less than or equal to half the flange diameter of the flange.

A machining device may include an electric motor, a blade rotatably driven by the electric motor for machining a workpiece, and a blade cover configured to surround the blade. A resonance sound reduction device may be disposed at the blade cover and may reduce air vibration generated by the rotation of the blade.

A machining device may include an electric motor, a blade rotatably driven by the electric motor for machining a workpiece, and a blade cover configured to surround the blade. A resonance sound reduction device may be disposed at the blade cover and may reduce air vibration generated by the rotation of the blade.

Protective cooling cover which comprises a hollow shell defining a generally semi-cylindrical cavity (15) that covers a portion of a cutting disc (2) at the top and that is delimited by two lateral walls (11, 12) and a curved perimeter wall (13), a cooling device including a tube connected to a cooling liquid supply and to a cooling liquid projecting nozzle (31), and a fastening device for fixing said cooling liquid projecting nozzle at different positions within the cavity (15) of the shell for projecting cooling liquid to different areas of the cutting disc, said fastening device including a plurality of first fasteners connected to the periphery of the cavity, and a second fastener connected to the cooling liquid projecting nozzle (31), said first and second fasteners providing a snap fit releasable connection.