Abstract: A piston-cylinder unit for pressure fluids includes a housing bounded by a head piece at each end thereof; a cylinder disposed within the housing; a piston reciprocatingly movable within the cylinder; a pulley having a circumferential outer surface is mounted for rotation about an axis within each of the head pieces; a pull belt is secured to the piston and looped around the outer surface of the pulleys; a power pick-up is attached to the pull belt; a braking device for the pull belt is disposed within the head piece and juxtaposed with at least one of the pulleys and has a shape which is complementary to at least a portion of the circumferential surface of the pulley; and a feed conduit connected to the head piece for feeding the pressure fluid to the braking device.

Abstract: The braking device (2) is formed between a force collector (3) and a cylinder casing (1) by way of slider tracks (5) and counter slider tracks (6) and by sliding bodies (7) guiding the slider tracks and counter slider tracks in a working cylinder without piston rod. The adjusting elements (12) for the setting of a sliding or a braking play can be set according to the sliding bodies (7). In order to achieve a compact construction, a low construction height, as well as a lowest possible number of parts, the braking device (2) is disposed symmetrically to a slider plane and a casing center longitudinal plane (19), respectively. The braking device is furnished with a force member (20) acting in the region (21). The lever element (22) engages centrally in each case with the lever arms (22a, 22b) on the adjusting element (12). A press-on force generating the braking force centrally engages the lever elements (22).

Abstract: A device is disclosed for the selective clamping of an axially moveable or rotatable cylindrical shaft. The device disclosed may be either of a spring actuated-pressure release or a pressure actuated spring release embodiment. A clamping sleeve is located coaxially surrounding the cylindrical shaft to be immobilized. The clamping sleeve is separated into clamping elements at one end by longitudinal slots in the generally cylindrical sleeve. An actuating element is also arranged coaxially to the cylindrical body and the clamping sleeve and is mounted exterior to the clamping sleeve. The clamping elements are located radially inwardly from the actuating element and are separated therefrom by a series of bearings. The bearings engage the actuating element and the clamping elements through matched sets of inclined ramp elements. Each clamping element is provided with a set of bearings and ramp elements.