Abstract: The invention concerns an overhead crane track which includes at least one crane track rail (1) and at least one carnage (2) guided on the crane track rail (1). The crane track rail (1) is composed of a plurality of portions of a hollow profile member. The carriage (2) is guided on a runway formed within the hollow profile member. The carriage (2) includes at least one electric drive which is supplied with power by way of a power feed provided within the hollow profile member. The carriage (2) is arranged displaceably by way of drive means arranged completely in the interior of the hollow profile member within same.

Abstract: The invention concerns a compressed air balancer (1) for raising, holding and lowering a load, comprising a cable drum (4) which is rotatable and displaceable along its axis of rotation for rolling up and unrolling a cable holding the load, a housing which preferably includes a cylindrical casing (2) and two end closure covers (3), a piston (7) which is subjected to the effect of gas pressure and which is displaceable axially in the housing; and a ball thread transmission which includes a ball rolling spindle (5) and a ball nut (6) and which converts an axial movement of the piston (7) into a rotary movement and axial movement of the cable drum (4). The compressed air balancer (1) is distinguished in that an external running surface of the piston (7) is formed by an internal surface (12) of a tube (8) which is fitted in the form of an internal sleeve into the cylindrical casing (2). Preferably a carbon fiber tube is used as the tube (8).