A tool holder with a main part, a deformable receiving portion for clamping a tool, and at least one blocking element which is designed to engage into a corresponding counter element on the tool in order to prevent the tool from moving axially out of the tool holder. The at least one blocking element is integrally formed with the receiving portion. A clamping system having such a tool holder and a method for producing a receiving portion for such a tool holder are also described.

A self-locking device of an electric tool output shaft includes a main shaft, a power output disk, a stop ring, and a plurality of self-locking pins. An upper end surface of the power output disk is provided with a plurality of drive blocks. A bottom of the main shaft is inserted into the power output disk. An inner side of the power output disk is provided with a plurality of drive surfaces. An outer wall of a lower end of the main shaft is provided with a plurality of driven surfaces and a plurality of self-locking surfaces. The main shaft has the driven surfaces to lean against the drive surfaces and the power output disk to accomplish a power output function, and further has the self-locking surfaces to lean against the self-locking pins to accomplish a self-locking function.

A drill chuck has a chuck body having a plurality of angularly spaced and axially extending but angled guide grooves each holding a jaw that is axially displaceable between an axially front closed position and an axially rear open position. Each jaw has an outer edge formed with external teeth, and also has an axially rearwardly directed rear face extending at an acute angle to a plane perpendicular to the axis. A ring rotatable on the body about the axis has an internal screwthread meshing with the teeth, and an adjustment sleeve rotationally coupled to the ring is rotatable to move the jaws between the open and closed positions. A cover disk on the rear end of the body is formed with respective throughgoing chip-discharge holes each having an inner end aligned with a respective one of the grooves and an outwardly open outer end.

The invention relates to a drill chuck which has a drilling needle receptacle device for removable receiving of a drilling needle (1), a hollow cylindrical magnetic holder for the drilling needle receptacle device and a coupling device for torque transfer from a drive device to the drilling needle receptacle device. The drilling needle receptacle device, in which a drilling needle (1) having a flattened end section (1) can be received, has a receptacle element (7), at least two clamping bodies (10) and a clamping insert (6). The receptacle element (7) has at least one cylindrical section (72) having a recess (71) and the clamping insert (6) has counter-molded bodies (61) which supplement the clamping bodies (10) and which extend away from a stop disc (62). The stop disc (62) contacts a face of the cylindrical section (72) and has a lead-through opening (63) for the drilling needle (1). The counter-molded body (61) and the clamping bodies (10) are designed in respect of the dimensions and shape thereof for arrangement in the recess (71) and for clamping receiving of the flattened end section (1) of the drilling needle (1) between the clamping bodies (10) and the counter-molded bodies (61). The invention further relates to a drilling needle and to a drilling needle-drill chuck assembly.

An electric grinding tool includes a motor housing coupleable to an electrical power source, a motor configured to receive power from the electrical power source and including an output shaft extending along a motor axis, a handgrip coupled to and coaxial with the motor housing, a tool holder rotatably driven upon rotation of the motor, the tool holder configured to receive a shaft of a grinding accessory, and a light unit coupled to and at least partially recessed in a front end portion of the electric grinding tool. The light unit includes a plurality of lights mounted to an at least partially ring shaped printed circuit board that is received in a support ring, and a cover ring received over the lights.

An accessory tool includes an adapter end, and a shank coupled to the adapter end and including a first length. The shank includes a tool engagement portion, and a first reduced portion disposed between the tool engagement portion and the adapter end. The first reduced portion has a second length. The shank additionally includes a second reduced portion formed in the tool engagement portion between the first reduced portion and an end of the shank. The second length is 2.5% to 15% of a total length of the accessory tool.

A mandrel assembly includes a mandrel, adapter, and bit coupler. The mandrel includes a shank part axially disposed in the mandrel, an adapter receiver, and a coupler receiver. An internal hole runs axially through the adapter. The coupler includes first and second axial sections, and an axial bit connection hole with a polygonal section proximate to an inner side, and a cylindrical section proximate to an opening. An outer wall of the adapter fits with an inner wall of the adapter receiver. An outer wall of the first section fits with an inner wall of the coupler receiver. An outer wall of the second coupler fits with the internal hole of the adapter. The mandrel transmits torque, via the adapter receiver and coupler receiver, to the adapter and then to a hole saw coupled to the adapter, and to the coupler and then to a bit coupled to the coupler.

A machine tool includes: a lower tool rest on which a plurality of tools are mounted; a motor provided at the lower tool rest, for rotating a rotating tool when the rotating tool is mounted on the lower tool rest; and a tool holder attached to the lower tool rest, for detachably holding the tool. The tool holder has a clamping mechanism portion operating between a clamping state of clamping the tool and an unclamping state of unclamping the tool, as a result of transmission of motive power generated at the motor. With such a configuration, the clamping mechanism portion for automatically clamping and unclamping the tool held in the tool holder on the tool rest is provided with a simple configuration.

The invention provides a clamping system (1) for a rotary tool (70), for example a milling cutter or drill. The clamping system (1) includes a base element (10), a collet (30) and a clamping nut (50), said clamping nut (50) friction-locking the rotary tool (70) within the base element (10) with the collet (30). In order to avoid a relative rotation of the base element (10) and the collet (30), the clamping system (1) has a form locking anti-twist protection which blocks a rotation of the collet (30) relative to the base element (10).

A surgical instrument includes a handpiece to which a handpiece shaft can be flanged, and a tool mounting for receiving a tool which can be rotatably supported in the handpiece shaft for axially securing the tool in the tool mounting and for transferring a torque to the tool. The tool mounting includes a sleeve-shaped entrainment shaft with a plug-in zone for a torsion rod and torque transmission and axial locking zones for the tool. The tool mounting also includes a closure sleeve surrounding the entrainment shaft that includes a distal blocking section which acts on the axial locking zone of the entrainment shaft for axially locking and releasing the tool, and a proximal arresting section acting on the plug-in zone of the entrainment shaft for arresting the tool mounting on the torsion rod to transfer torques and axial forces and for releasing the tool mounting from the torsion rod.