Abstract: A rotor for a wind power installation and method for operating a wind power installation are provided. The rotor includes a first and a second blade support and a first set of at least two rotor blades. The rotor blades of the first set have a vane-shaped configuration and extend helically from the first to the second blade support. The rotor includes at least one additional blade support and at least one additional set of at least two rotor blades. The rotor blades of the additional set have a vane-shaped configuration and extend helically from the second to the additional blade support. The arrangement of the rotor blades of the additional set is arranged with an angular offset to the arrangement the rotor blades of the first set.

Abstract: The invention relates to an air suspension piston, with the air suspension piston being tube shaped and being made of aluminium. The air suspension piston is formed by a longitudinal-seam welded tube made from an aluminum alloy, and the tube has been longitudinal-seam welded without any weld metal.

Abstract: Charger for a battery which is connected to a plug via a charging cable and which cooperates with a socket connected to the battery, the plug comprising a plug housing in which plug pins connected to the charging cable are arranged and means being associated with the plug which react when the plug and socket are mechanically disconnected and the means generate a signal which causes the charger to switch off, characterised in that the plug comprises a handle which may be manually grasped and with which the plug is pulled out of the socket and a switching element is associated with the handle which is actuated upon disconnection and is connected to the charger via a signal path.

Abstract: The invention relates to a method for manufacturing an aluminum tube, an aluminum tube for further processing in at least one subsequent deformation process, as well as the use of the aluminum tube. The object of providing a simple method for manufacturing an aluminum tube with elevated deformation potential is solved by texturing the outer surface of the aluminum tube using temper rolls. The application of a texture using temper rolls yields a sufficiently high roughness on the surface of the aluminum tube on the one hand, so that the strain can be increased in subsequent deformation processes. On the other hand, while the roughening of the surface can be integrated into existing manufacturing processes, e.g., for straight bead welded or extruded aluminum tubes a swift and easy manufacture of the semi-finished product is enabled.

Abstract: The invention relates to an air suspension piston, with the air suspension piston being tube shaped and being made of aluminium. The air suspension piston is formed by a longitudinal-seam welded tube made from an aluminum alloy, and the tube has been longitudinal-seam welded without any weld metal.

Abstract: The invention relates to an air suspension piston, with the air suspension piston being tube shaped and being made of aluminium. The air suspension piston is formed by a longitudinal-seam welded tube made from an aluminium alloy, and the tube has been longitudinal-seam welded without any weld metal.