Abstract: A chuck has an attachment device for attaching the chuck to a machine spindle and a collet with clamping jaws defining an insertion opening at an end of the chuck opposite the attachment device. A sliding sleeve surrounds the clamping jaws and is axially moveable into a clamping position for clamping a machining tool inserted into the insertion opening and into a release position for releasing the tool. Between an inner circumference of the sliding sleeve and an outer circumference of the clamping jaws a contact path conically tapering in an axial direction and counter pressure members that engage positively the contact path are provided. The contact path is positioned at a slant relative to the axial longitudinal center of the collet. The slant angle is so small that under expected operating forces a self-locking action between contact path and counter pressure members is maintained at all times.

Abstract: A chuck has an attachment device for attaching the chuck to a machine spindle and a collet with clamping jaws defining an insertion opening at an end of the chuck opposite the attachment device. A sliding sleeve surrounds the clamping jaws and is axially moveable into a clamping position for clamping a machining tool inserted into the insertion opening and into a release position for releasing the tool. Between an inner circumference of the sliding sleeve and an outer circumference of the clamping jaws a contact path conically tapering in an axial direction and counter pressure members that engage positively the contact path are provided. The contact path is positioned at a slant relative to the axial longitudinal center of the collet. The slant angle is so small that under expected operating forces a self-locking action between contact path and counter pressure members is maintained at all times.

Abstract: A miniature drill chuck has a drill chuck housing and a thrust member positioned in the interior for moving clamping jaws into their clamping position during a threading movement of the drill chuck housing onto a machine spindle. The thrust member is longitudinally moveable in a guide bore of the drill chuck housing while being centered circumferentially about its entire stroke. A pair of truncated cone surfaces is provided between the machine spindle and the thrust member, wherein the machine spindle centers the thrust member via the pair of truncated cone surfaces when loading the thrust member.

Abstract: Screwing tool (1) with a handle (2), tool holding fixture (3) and ratchet (4), in which the ratchet has a pivotally mounted ratchet element (6) which has several catch cams (5), and a first stop bolt (7), in which stop bolt (7) can be engaged with ratchet element (6) by displacement in an axial direction (9) defined by axis of rotation (8), such that handle (2) can turn relative to the tool holding fixture (3) in a first direction of rotation and can be locked by form-fit in the opposite second direction of rotation.