An apparatus (1) for carrying out the replacement of an abrasive element (20) in a machine (100) for finishing surfaces, comprises a support body (10) configured to reversibly engage the abrasive element (20). The support body (10) and the abrasive element (20) provide, at respective engagement surfaces (15,25), mutual engagement members of removable type (16,26) configured to move from an engagement position to a disengagement position by rotating about a rotational axis (110) in a first sense of rotation e, from the disengagement position to the engagement position, by rotating about the rotational axis (110) in a second sense of rotation opposite to the first one. The apparatus furthermore, comprises a displacement device (40) for moving the support body (10) in the space according to at least 1 degree of freedom. The apparatus (1), furthermore, provides at least a removal station (101) for removing an abrasive element (20) from the support body (10), or at least an application station (102) for engaging an abrasive element (20) to the support body (10).

A handheld sanding device according to the present invention includes: a power generation unit configured to generate rotating force for sanding operation; a power transmission unit configured to be coupled to the power generation unit, and to transmit the rotating force generated by the power generation unit; a sanding unit configured to be rotated by the rotating force, transmitted through the power transmission unit, in order to sand a sanding target surface; and a shaft coupling unit configured to connect the power transmission unit and the sanding unit to each other so that the sanding unit is freely inclined based on the power transmission unit, thereby improving the close contact between the sanding target surface and the sanding unit while making it easy to carry and also preventing the sanding target surface from being eccentrically worn during sanding operation.

The disclosure is generally directed to abrasive rotary tools capable of expanding into a substrate. Exemplary abrasive rotary tools include an expandable collet configured to expand an abrasive surface of the abrasive rotary tool. The expandable collet may be positioned proximate to a multi-planar edge of a substrate, such as a hole, and expanded into the edge to more fully and/or evenly contact the edge of the substrate. In this way, an abrasive rotary tool may more quickly and/or consistently abrade the edge.

The disclosure is generally directed to abrasive rotary tools capable of expanding into a substrate. Exemplary abrasive rotary tools include an expandable collet configured to expand an abrasive surface of the abrasive rotary tool. The expandable collet may be positioned proximate to a multi-planar edge of a substrate, such as a hole, and expanded into the edge to more fully and/or evenly contact the edge of the substrate. In this way, an abrasive rotary tool may more quickly and/or consistently abrade the edge.

A quick clamping device for positioning an accessory device on a hand-held power tool such as an angle grinder. The quick clamping device includes a drive output unit for moving the accessory device about a drive output axis of the drive output unit. The quick clamping device further includes a retaining unit for retaining the accessory device on the hand-held power tool. The retaining unit has a retaining element. The retaining unit has a retaining parameter which changes in a retaining state, in particular in the event of a transition from a retaining state to a clamping state.

The invention relates to a tool device which is suitable for use with a machine tool, in particular a hand guided machine tool, having a driving device moving, in particular in an oscillating manner, around a driving axis. The tool device has an attachment device which allows it to be fastened on a machine tool such that its driving axis and an axis of rotation of the tool substantially coincide. The attachment device, for absorbing the driving force, has at least two driving area regions, which are spaced apart from said tool axis of rotation and each has a plurality of surface points. The tangent planes to said surface-area points are inclined in regard to an axial plane, which encloses the tool axis of rotation. Furthermore, said tangent planes are inclined regard to a radial plane which extends perpendicularly to the tool axis of rotation. This means that the torque introduced into the tool device by the machine tool, via the driving device, is reliably absorbed.

The invention relates to a tool device which is suitable for use with a machine tool, in particular a hand guided machine tool, having a driving device moving, in particular in an oscillating manner, around a driving axis. The tool device has an attachment device which allows it to be fastened on a machine tool such that its driving axis and an axis of rotation of the tool substantially coincide. The attachment device, for absorbing the driving force, has at least two driving area regions, which are spaced apart from said tool axis of rotation and each has a plurality of surface points. The tangent planes to said surface-area points are inclined in regard to an axial plane, which encloses the tool axis of rotation. Furthermore, said tangent planes are inclined regard to a radial plane which extends perpendicularly to the tool axis of rotation. This means that the torque introduced into the tool device by the machine tool, via the driving device, is reliably absorbed.

Provided is a machining tool, including: a tool head, configured to contact a workpiece to be processed and process the workpiece to be processed; a tool shank including a body and a fixing recess formed by recessing from one end of the body in an axial direction of the body; and a fixing shaft including a shaft body formed by extending from the tool head and a shaft extension extending from the shaft body in a direction facing away from the tool head. The shaft extension is inserted into the fixing recess to achieve fixing. At least a portion of the shaft extension has a non-circular cross-section, and a shape of the fixing recess matches a shape of the shaft extension. Compared with the related art, the machining tool of the present disclosure has high processing precision and good reliability.

Provided is a machining tool, including: a tool head, configured to contact a workpiece to be processed and process the workpiece to be processed; a tool shank including a body and a fixing recess formed by recessing from one end of the body in an axial direction of the body; and a fixing shaft including a shaft body formed by extending from the tool head and a shaft extension extending from the shaft body in a direction facing away from the tool head. The shaft extension is inserted into the fixing recess to achieve fixing. At least a portion of the shaft extension has a non-circular cross-section, and a shape of the fixing recess matches a shape of the shaft extension. Compared with the related art, the machining tool of the present disclosure has high processing precision and good reliability.

The present disclosure provides a grinding cup for detachable connection to the output drive shaft of a grinding machine for grinding buttons on drill bits or cutters. The grinding cup has top and bottom surfaces and consists of a lower grinding section and an upper body section co-axial with the grinding section to form a grinding cup with a centrally disposed recess formed in the bottom surface of the grinding section having the desired profile for the button to be ground. The improvement of the present invention is characterized by the upper body section having a centrally disposed upright drive section sized and shaped to fit within a co-axial recess in a free end of the output drive shaft. The upright drive section has a first support section extending from a top surface of the upper body section and a co-axial drive section on the upright drive section extending from a top surface of the first support section to a free end of the upper drive section. The co-axial drive section has a lower cam portion with an elliptical cross section, shaped and sized to fit within a corresponding pair of lobed grooves in a sidewall of the co-axial recess in the output drive shaft and an upper portion, co-axial with the lower cam portion having a circular cross-section slightly less than the diameter of an upper portion of the co-axial recess in the output drive shaft. Retaining means for detachably connecting the grinding cup to the output drive shaft of the grinding machine are provided on the upright drive section, preferably on or in association with the first support section.