A method for operating a machine tool, in particular an angle grinder, comprising a tool rotatably bringable into operative connection with a driven shaft, the machine tool having a drive device for actuating the driven shaft, a control device for actuating the drive device and at least one sensor device operatively connected to the control device. The method has the following steps: determining a speed value of the driven shaft; determining a speed value of the tool using the sensor device, which interacts with the tool, controlling an output device and/or controlling, in a predefined manner, the drive device via the control device when a difference between the determined speed value of the driven shaft and the determined speed value of the tool is greater than a defined limit value. A machine tool for carrying out a method of this kind is also described.

A power tool that is configured to provide finishing of a surface of an object wherein the power tool provides movement in a first direction and a second direction. The power tool of the present invention includes a housing wherein the housing has a coupling assembly secured to the front end thereof. The rear end of the housing includes a brush compartment formed therein. A sanding member is releasably secured to the coupling assembly and includes a planar body configured to have sanding paper secured thereto. A filing member is also provided and configured to be releasably secured to the coupling assembly. The filing member includes a rectangular body having formations on the outer surface thereof. A three-way switch provides control to move the sanding member and the filing member in the first and second direction. A battery power supply is disposed in the housing.

A power tool that is configured to provide finishing of a surface of an object wherein the power tool provides movement in a first direction and a second direction. The power tool of the present invention includes a housing wherein the housing has a coupling assembly secured to the front end thereof. The rear end of the housing includes a brush compartment formed therein. A sanding member is releasably secured to the coupling assembly and includes a planar body configured to have sanding paper secured thereto. A filing member is also provided and configured to be releasably secured to the coupling assembly. The filing member includes a rectangular body having formations on the outer surface thereof. A three-way switch provides control to move the sanding member and the filing member in the first and second direction. A battery power supply is disposed in the housing.

The present invention relates to a sander, and a method for disassembling or installing a working head of the sander. The sander includes: a main body, including a housing, a motor disposed in the housing, a switch mechanism for controlling the motor includes a switch, and a drive component driven by the motor to rotate; and a working head adapted to the drive component. The main body further includes an interlocking mechanism, the interlocking mechanism includes an operation member movably disposed relative to the housing, the operation member is operably shifted between a first state and a second state, when the operation member is in the first state, the interlocking mechanism allows the switch to be triggered, when the switch is in a triggered state, the operation member is prevented from being shifted from the first state to the second state; and when the operation member is in the second state, the interlocking mechanism prevents the switch from being triggered. The sanding machine of the present invention has high security and can be operated conveniently.

The present invention relates to a sander, and a method for disassembling or installing a working head of the sander. The sander includes: a main body, including a housing, a motor disposed in the housing, a switch mechanism for controlling the motor includes a switch, and a drive component driven by the motor to rotate; and a working head adapted to the drive component. The main body further includes an interlocking mechanism, the interlocking mechanism includes an operation member movably disposed relative to the housing, the operation member is operably shifted between a first state and a second state, when the operation member is in the first state, the interlocking mechanism allows the switch to be triggered, when the switch is in a triggered state, the operation member is prevented from being shifted from the first state to the second state; and when the operation member is in the second state, the interlocking mechanism prevents the switch from being triggered. The sanding machine of the present invention has high security and can be operated conveniently.

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 refers to a backing pad (2) for a hand-guided polishing or sanding power tool, comprising a support layer (4) made of a rigid material, the support layer (4) comprising a connection element (6) on its top surface (8) for connection of the backing pad (2) to a driving shaft (18) or an eccentric element of the polishing or sanding power tool, a damping layer (10) made of a resilient material, the damping layer (10) being fixedly attached to a bottom surface (12) of the support layer (4), and an adhesive layer (14) for releasable attachment of a polishing or sanding member to the backing pad (2), the adhesive layer (14) being fixedly attached to a bottom surface (16) of the damping layer (10)

It is suggested that the bottom surface (12) of the support layer (4) is provided with reinforcement elements (24, 26, 28; 46; 50, 52) for enhancing flexural rigidity of the support layer (4), and the bottom surface (12) of the support layer (4) is further provided with recesses (30) formed between and at least partially limited by the reinforcement elements (24, 26, 28; 46; 50, 52), wherein during manufacture of the backing pad (2) the resilient material of the damping layer (10) enters into the recesses (30) and after curing of the resilient material entirely fills the recesses (30).

The invention refers to a backing pad (2) for a hand-guided polishing or sanding power tool, comprising a support layer (4) made of a rigid material, the support layer (4) comprising a connection element (6) on its top surface (8) for connection of the backing pad (2) to a driving shaft (18) or an eccentric element of the polishing or sanding power tool, a damping layer (10) made of a resilient material, the damping layer (10) being fixedly attached to a bottom surface (12) of the support layer (4), and an adhesive layer (14) for releasable attachment of a polishing or sanding member to the backing pad (2), the adhesive layer (14) being fixedly attached to a bottom surface (16) of the damping layer (10)

It is suggested that the bottom surface (12) of the support layer (4) is provided with reinforcement elements (24, 26, 28; 46; 50, 52) for enhancing flexural rigidity of the support layer (4), and the bottom surface (12) of the support layer (4) is further provided with recesses (30) formed between and at least partially limited by the reinforcement elements (24, 26, 28; 46; 50, 52), wherein during manufacture of the backing pad (2) the resilient material of the damping layer (10) enters into the recesses (30) and after curing of the resilient material entirely fills the recesses (30).

A power tool is provided including a housing; an electric motor disposed within the housing; a main trigger switch mounted on the housing; a side handle mounted on the housing, the side handle having an auxiliary trigger; and a controller disposed within the housing operable to control a flow of electric current from a power source to the electric motor. The controller activates the motor only if the main trigger and the auxiliary trigger are both actuated. If the one of the triggers is released while the other trigger is still engaged, the controller is configured to continue operating the motor only if the released trigger is reengaged within a time threshold, but otherwise discontinue operating the motor until both the main trigger and the auxiliary triggers are released and reengaged.

The invention refers to a backing pad (100) for use with a hand-held or hand-guided orbital sander (10) or polisher. The backing pad (100) has a planar extension and an essentially triangular form comprising a triangular region (102), with a top surface for releasable attachment of the backing pad (100) to the sander (10) or polisher and with a bottom surface for releasable attachment of a sheet-like sanding or polishing member (132) to the backing pad (100). In order to provide for a possibility to sand or polish surfaces within narrow, cramped, tight, twisty and crooked spaces with a sander (10) or polisher having an essentially triangular backing pad (100), it is suggested that the backing pad (100) comprises at least at one of the three corners (104) of the triangular region (102) a protrusion (108) extending in the plane of the planar extension of the backing pad (100) and projecting laterally beyond the triangular region (102).