A grinder may include a motor; a spindle to which a grinding wheel is attached; bevel gears configured to transmit rotation of the motor to the spindle; a motor housing which houses the motor; a gear housing attached to a front side of the motor housing and housing the bevel gears; a spindle case attached to a lower side of the gear housing and rotatably supporting the spindle; a wheel cover attached to the spindle case and covering an outside of at least a part of the grinding wheel; and a stopper configured to prohibit removal of the wheel cover, wherein the stopper may be fastened together with the spindle case by a screw which fastens the spindle case to the gear housing.

A power tool has a functional component, a motor, a power supply module, a controller and a drive circuit including a first drive terminal and a second drive terminal respectively electrically connected to a first power terminal and a second power terminal of the power supply module, multiple high-side switches wherein high-side terminals of the high-side switches are respectively electrically connected to the first drive terminal, and multiple low-side switches wherein low-side terminals of the low-side switches are respectively electrically connected to the second drive terminal. The controller is configured to output a first control signal to one high-side switch to place it in an on or off state and output a second control signal to one low-side switch to place it in the other state. The low-side terminal of one high-side switch is connected to the high-side terminal of one low-side switch.

The invention refers to a double-sided polishing or sanding member (24) for releasable attachment to a hand-guided power tool (2). The polishing or sanding member (24) has an essentially disc-shaped form with an areal extension (26). A reinforcement plate (28) is located inside the polishing or sanding member (24) in the areal extension (26). The reinforcement plate (28) has a central attachment portion (30) for releasable attachment of the polishing or sanding member (24) to the power tool (2). It is suggested that the central attachment portion (30) comprises at least one magnetic element (32) adapted for interaction with at least one respective magnetic element (34) directly or indirectly attached to a tool shaft (14) of the power tool (2) in order to hold and secure the polishing or sanding member (24) in respect to the tool shaft (14).

A quick clamping device for a portable machine tool, in particular an angle grinder, includes at least one output shaft, at least one clamping unit, at least one operating unit, and at least one securing unit. The clamping unit, for the purpose of fixing an insert bit to the output shaft without using tools, includes at least one clamping element for applying a clamping force to the bit in a clamping position. The operating unit moves the clamping element into the clamping position and/or into a release position in which the insert bit can be removed from the clamping unit and/or the output shaft. The securing unit is designed to prevent movement of the clamping element from the clamping position into the release position at least under the action of a force decoupled from the operating unit and acting on the clamping element in the direction of the release position.

An electric power tool disclosed herein may include a motor; a power transmission mechanism connected to the motor; a housing that houses the motor and the power transmission mechanism; a tip tool holder connected to the power transmission mechanism; a cover covering the tip tool holder partially; a first locking mechanism configured to switch between a first locking state and a first unlocked state; and a second locking mechanism configured to switch between a second locking state and a second unlocked state. In the electric power tool, the cover may become detachable from the housing when the user performs the second unlocking operation on the second locking mechanism and the first unlocking operation on the first locking mechanism.

An electric tool is provided, including: a cylindrical motor housing accommodating and supporting a motor; and a cooling fan attached to a rotation shaft of the motor, in which the motor is cooled by flowing air generated by the cooling fan from a back side toward a front side of the motor housing. A fan guide guiding cooling air is provided in front of an insulator of a stator of the motor. The fan guide includes a first cylindrical part covering a rotation space of the cooling fan, a guide surface, and a second cylindrical part extending backward from the guide surface. A labyrinth space is formed by the insulator and the second cylindrical part. By providing the labyrinth space, it is possible to block the flow of cooling air from an outer peripheral side of the stator to an opening.

A power tool has a functional component, a motor, a power supply module, a controller and a drive circuit including a first drive terminal and a second drive terminal respectively electrically connected to a first power terminal and a second power terminal of the power supply module, multiple high-side switches wherein high-side terminals of the high-side switches are respectively electrically connected to the first drive terminal, and multiple low-side switches wherein low-side terminals of the low-side switches are respectively electrically connected to the second drive terminal. The controller is configured to output a first control signal to one high-side switch to place it in an on or off state and output a second control signal to one low-side switch to place it in the other state. The low-side terminal of one high-side switch is connected to the high-side terminal of one low-side switch.

A power tool includes a brush holder with a brush positioned more accurately with respect to a commutator. A grinder as a power tool includes a housing, a stator fixed to the housing, a rotor rotatable relative to the stator and including a commutator and a coil, a brush that comes in contact with the commutator, a brush-holding metal plate having a screw hole and holding the brush, and a screw extending through the screw hole and directly fastened to the housing.

A storage shield for a disc of an angle grinder is provided according to the present invention. The storage shield includes a first shield member and a second shield member. Each of the first and second shield members includes a front face, an opposing rear face positioned parallel to and a distance apart from the front face, an end wall that joins an upper edge of the front face to an upper edge of the rear face, and a front face opening between a lower edge of the front face and a lower edge of the rear face, and an opening in a center area of the front face at the lower edge thereof. A pivot hinge assembly pivotally connects a first end of the first shield member to a first end of the second shield member. Fastening means for affixing the storage shield and stored angle grinder to a worksite surface are affixed to the rear face of one of the first shield member or second shield member. A method of protecting a disc of an angle grinder when not in use is also provided. First, the storage shield is opened. Second, the disk of the angle grinder is inserted into the open storage shield such that a spindle of the angle grinder is aligned with the openings in the front faces of the first and second shield members. Next the storage shield is closed. Finally, the storage shield and the angle grinder are affixed to a worksite surface.

A power tool includes a brushless motor including several windings, a drive circuit for driving the brushless motor, a detection device for detecting the brushless motor so as to obtain a load parameter corresponding to a load of the brushless motor, and a controller for outputting a first control signal to reduce current of the brushless motor in a first slope when the load parameter exceeds a first preset range.