A holding device for holding plastic containers and in particular plastic parisons with a holding section which can be introduced into a mouth of the plastic containers, wherein the holding section has at least one first holding element and one second holding element which are movable relative to one another and which in each case have a section which can be applied to an inner wall of the mouth. According to the invention an expansion body which supports the two holding elements at least intermittently is disposed between the holding elements, wherein a replaceable expansion element is disposed on this expansion body, wherein this expansion element is located at least in some sections between the expansion body and the holding elements.

A clamping fixture for clamping a component, in particular a workpiece or tool, having a number of clamping jaws, distributed along a periphery, which are connected by appropriate elastic flexural webs to a main body, wherein the clamping jaws are adjustable by an axially movable actuating device in a radial direction from a release position into a holding position, which clamping fixture is characterized in that the flexural webs, in their release position, are inclined in relation to an axially parallel direction radially in a direction of their respective holding positions.

The invention relates to a clamping bushing (21) for clamping in a bore (3) of a component (2), in particular of a workpiece to be clamped, wherein the clamping bushing (21) is radially contracted in a relaxed state such that the clamping bushing (21) can be inserted into the bore (3) and pulled out of the bore (3), whereas the clamping bushing (21) is radially expanded in a stressed state such that the lateral surface of the clamping bushing (21) forms a mechanical connection to the inner wall of the bore (3). According to the invention, the mechanical connection between the lateral surface of the clamping bushing (21) and the inner wall of the bore (3) is positive-locking and consists of a threaded connection. The invention further relates to a corresponding clamping device (1). An essential feature of the invention is also the possibility of being able to exchange the clamping bolt (tension anchor) by means of a bayonet coupling without having to open hydraulic lines and without removing the clamping element from the device.

The present disclosure pertains to an expandable jam chuck and a kit to address a need for a versatile and efficient tool in woodturning. The expandable jam chuck includes a base jam chuck configured to mechanically connect individually or along with one or more expansion jam chucks, with a lathe chuck or coupled and mounted onto the threaded shaft of the lathe. An intermediate expansion jam chuck interlocks with the base jam chuck, while additional expansion jam chucks interlock in a nested arrangement over the intermediate jam chuck. The expandable jam chuck allows selective interlocking based on the internal surface profile and size of a workpiece.

A clamping ram has a shaft with a longitudinal axis, a first end and a second end. At the second end, two arms are arranged which extend in the longitudinal direction and are mutually spaced by a gap. Each of the arms has an inner surface and an outer surface. At a free end of the arms, a radial thickening is provided on each outer surface. Between the two arms, a wedge plate is arranged so as to be movable in the longitudinal direction. In a retracted position of the wedge plate, the arms are in a compressed state and, in an advanced position of the wedge plate, the arms are in a spread state. Each of the two radial thickenings has a contact surface which, in the spread state, are each part of an imaginary surface that is rotationally symmetrical about the longitudinal axis.

Provided is ram clamping system (100) comprising a rotationally symmetrical main body (110), which has an opening that passes through the rotationally symmetrical main body (110) along its axis of symmetry, in which opening a drawbar (140) extends, comprising a collet (120) which can be clamped by means of the drawbar (140) for fixing a ram (190) associated with the ram clamping system (100), and comprising an exchangeable holder (180), through the interior (181) of which the ram (190) passes before entering the collet (120), wherein at least one portion of the collet (120) projects in the direction of extension of the drawbar (140) beyond the end face of the main body (110), on which end face the exchangeable holder (180) is arranged, and enters the interior (181) of the exchangeable holder (180).