A dustproof structure of a grinding tool holder, which comprises a shaft portion and a counterweight portion connected to one end of the shaft portion. The counterweight portion comprises an eccentric block connected to the shaft portion, at least one bearing mounted in the eccentric block, a dustproof ring, and a grinding member assembling head assembled with the bearing. The eccentric block is formed with an assembly port for disposing the bearing and the dustproof ring, the dustproof ring is located on a side of the bearing facing the grinding member assembling head, and formed with a first continuous concave-convex structure on a side away from the bearing, the grinding member assembling head is formed with a second continuous concave-convex structure on a side facing the dustproof ring, the first and second continuous concave-convex structures match with each other and define dust blocking dots.

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.

The present disclosure relates to a floor grinding machine for grinding floor surfaces of stone or stone-like material. Such a machine comprises a machine frame, a grinding head 2, supported by and being rotatable relative to the machine frame, a grinding head hood 2, which defines a space in which the grinding head 1 is rotatable, a hollow and resilient member 4, arranged in the space, and a pressurized fluid source, operatively connected to the hollow member 4 to supply said pressurized fluid, whereby the hollow member 4 is resiliently expandable upon supply of said fluid.

A machine tool (1) is provided, in particular an angle grinder, including a spindle (8) that can be driven about a rotational axis (L), a device (9) being provided which can be fixed to the spindle (8) by a rotary connection. A separate securing device (26) is provided which is operatively connected to the spindle (8), which is arranged on the output side of the device (9), at least in some regions, and which, at least during operation of the machine tool (1), has a smaller outer diameter (28), at least in some regions, with respect to the rotational axis (L) than an outer diameter (14) of the spindle (8).

Example guards for use with power tools and power tools including such guards. The guards include a collar structured to be removably coupled to a hand-guided electrical tool, a hood coupled to the collar, and a guard ring coupled to the collar via the hood. The guard ring extends entirely around the collar.

A grinder particulate control assembly for collecting particulate generated while grinding an outside corner surface. The grinder particulate control assembly having an adjustable bonnet capable of being used with grinders and grinding disks of various sizes.

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.

The invention refers to a protective shroud (40) for a hand-guided power tool (1), in particular a polisher or sander, the protective shroud (40) being adapted to be attached to a housing (2) of the power tool (1) and to cover at least part of a working element (11) of the power tool (1). It is suggested that the protective shroud (40) is secured to the housing (2) in at least one direction by means of magnetic force (47, 59).

A power tool, such as a grinder, may include: a prime mover such as a motor; a power-transmission mechanism operably connected to the prime mover; a housing that houses the prime mover and the power-transmission mechanism; and a tool-accessory retaining part for holding a tool accessary. The tool-accessory retaining part is operably connected to the power-transmission mechanism. An accessory is mounted on the housing in a detachable manner. A link member moves in response to mounting and demounting of the accessory. A detection sensor is housed in an interior of the housing and includes a non-contact sensor device. The detection sensor is configured to detect movement of the link member using the non-contact sensor device.

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.