Abstract: The invention relates to a device for detachably securing modules (1), such as tool holders, to a third component (3), such as a rotatable tool disk for a machine tool, including a controllable securing device (51, 53), by which the respective module (1) can be re-secured in a detachable manner in a locked position on the third component (3) by individual securing parts (15). A release device (76, 77) at least partially helps to release the securing device (51, 53) in a release position, such that the release device (76, 77) at least at the beginning of releasing, exerts pressure on the securing device (51, 53) for releasing the individual securing parts (15).

Abstract: A connection device for connecting a tool holder (4) to a drive unit (2), which are provided on adjacently opposite contact surfaces with a serration (124, 56) each, which can be brought into engagement with each other and having a retraction device (90, 118), which reduces an axial distance between the serrations (124, 56) until they are in contact with each other.

Abstract: The invention relates to a device for detachably securing modules (1), such as tool holders, to a third component (3), such as a rotatable tool disk fora machine tool, comprising a controllable securing device (51, 53), by means of which the respective module (1) can be re-secured in a detachable manner in a locked position on the third component (3) by means of individual securing parts (15), and a release device (76, 77) which at least partially helps to release the securing device (51, 53) in a release position, such that the release device (76, 77) at least at the beginning of releasing, exerts pressure on the securing device (51, 53) for releasing the individual securing parts (15).

Abstract: The fastening of two parts (1 and 3) to one another, e.g. of a tool or workpiece, on a holder provides that the two parts (1 and 3) to be fastened together have adjoining fitting areas (4 and 5) when in use and are braced against one another by fastening means, e.g. a single fixing screw (2), extending diagonally or at right angles to the contact plane of these fitting areas (4 and 5). In this case, in addition to the fitting areas (4 and 5) fixing the reciprocal axial position in Z direction, fitting projections (9) are provided on the one part and fitting recesses (10) on the other part which prevent the parts (1 and 3) connected and braced with one another from shifting diagonally to the fastening means within the contact plane of fitting areas (4 and 5) and which center the two parts (1 and 3) diagonally to this contact plane in X and Y direction so as to fit accurately.