Abstract: The drive comprises an air-operated driving unit imparting either a linear or a rotary motion to the working member of a manipulator and, at the same time, driving the rotor of an electromagnetic brake in accordance with displacement of the working member. For linear movement of the working member, the driving unit comprises an air-operated piston-cylinder actuator and, for rotary movement of the working member, comprises a vane-type air motor. An electronic control system controls the operation of the driving unit and of the electromagnetic brake, and thus the motion of the working member.

Abstract: An endless track having chain links which comprise tubular bodies connected by connector links to the adjacent chain links, as seen in the direction of movement, is widened by at least one further tubular body and one further connector link, all tubular bodies and connector links preferably being of uniform basic dimension.

Abstract: Overload safety device for telescopic cranes includes transmitter means for registering a working radius of a crane jib having a base jib member and transmitter means for registering a load applied to the jib, analog computer means operatively connected to both the first and second transmitter means for comparing a nominal value predetermined by the working radius with actual values furnished by the transmitter means for registering the load, and signal means responsive to a condition wherein the actual values equal the nominal value for releasing an overload signal, the nominal values being proportional to a permissible limit moment for a respective working radius, the permissible limit moment being composed of a moment of the jib weight and a moment for the permissible load, the transmitter means for registering the load being mounted at the base jib member of the crane jib and being adapted to measure the bending moment of the base jib member, the transmitter means for registering the load being an elongat