Abstract: The tool holder of modular construction of driven tools for use on lathes consists at least of one base holder and various tool heads connectable interchangeably therewith. The base holder has a fixing shank, an attachment flange connected thereto, as well as a drive shaft rotatably mounted therein. Each tool head has at least one rotatable tool receptacle in a housing and a drivable shaft connected thereto. On the mutually facing ends of the drive shaft and the driven shaft there are provided coupling parts which can couple without relative rotation therebetween. The driven shaft is provided on the input side with a support pin freely projecting beyond the associated coupling part. The drive shaft is provided in the region of the attachment flange with a coaxial support bore, into which is received the support pin of the tool head.

Abstract: A clamping device for gripping a tool in a carrier. The clamping device has a hollow centering extension or spigot and an abutment surface surrounding it are provided on the tool. A tool receptacle provided in the carrier has a receiving bore matched to the centering extension and an end face surrounding the bore and against which the abutment surface can be pressed by a clamping arrangement. The clamping arrangement comprises a clamping sleeve movable coaxially with respect to the central axis and a clamping ring or collet movable in the opposite direction to the clamping sleeve, both of which are provided with clamping cones facing towards one another. The collet is movable axially on the clamping sleeve by means of a clamping nut screwable on the sleeve. A plurality of clamping jaws surround the clamping sleeve and the collet concentrically and are supported in each case by one end against their clamping cones.

Abstract: A tool turret has a housing and a revolving head which can be fixed in different rotational positions by means of an arrangement of toothed rings. A locking device includes a cam drive for the selective releasing and fixing in position of the gear teeth. In order to configure the tool turret simply and to save space, an axially movable, annular locking part is provided with axial gear teeth and has one part of the cam drive in the form of a curvilinear aperture. The middle sections of the curvilinear aperture are straight and side parts extend obliquely. A guide member penetrates the curvilinear aperture as the other part of the cam drive. The teeth cooperating with the teeth on the locking part are mounted on the revolving head and on a stationary toothed ring.