Abstract: The present invention relates to a cartridge for holding liquid, paste-like or powdered compounds and a piston for closing such a cartridge, and a system made up of such a cartridge, comprising a tool (15), wherein the piston comprises a cylindrical or cylindrical tube-like base member that can be placed into a cartridge and moved along the cylindrical longitudinal axis inside a cartridge, wherein at least one sealing lip (12) is provided that seals against a sealing surface running parallel to or at an acute angle with respect to the cylindrical longitudinal axis, wherein the sealing lip is arranged such that by way of a tool that can be accessed from an end side of the piston, the sealing lip can be lifted off the sealing surface when the cartridge is closed by the piston so that air can escape from the cartridge.

Abstract: A friction coupling for friction locking of a shaft relative to a hub, comprises a radially deformable inner sleeve, a substantially dimensionally stable outer sleeve and at least one pressure chamber defined by at least the inner sleeve and the outer sleeve. The inner sleeve is arranged to be radially deformed, thereby producing a surface pressure on the shaft, for friction locking of the shaft relative to the hub. Measuring means integrating with the outer sleeve is arranged to measure the strain of the outer sleeve, which strain is an indication of the friction locking. The above-described friction coupling can be used, for instance, in piston assemblies and press tables.

Abstract: A piston having a floating wedge carried in a recess of the skirt for limited axial movement. Reciprocation of the piston shifts the wedge position between upper and lower extremes, reducing the effective piston clearance in its cylinder during the upper portions of its stroke, thus reducing lateral piston motion and resulting piston slap caused noise.