Abstract: An expansion hose having a central internal throttle element dividing the interior of the hose into two chambers, and an internal hose extending from the expansion hose inlet through one of the chambers and the throttle element into the second chamber. The portion of the inner hose within the first chamber has radial throttle passages, and the portion within the second chamber is imperforate.

Abstract: The invention relates to a motor-driven vane pump, and in particular to vane pumps for generating a vacuum used to operate a secondary unit of an automobile. The vane pump comprises a cast approximately bell-shaped pump housing in which a rotor is eccentrically supported. The rotor is rigidly connected with and driven by a rotor shaft, and carries a plurality of sealing vanes slidably mounted in guide slots provided along its periphery. A rotationally symmetrical driving bell surrounds the pump housing with play, and is rigidly connected with the rotor shaft, which sealingly passes through the bottom of the pump housing. The rotor shaft is thus supported on only one side in the housing cover which closes off the end of the pump housing opposite the chamber bottom.

Abstract: An oil separator in combination with an oil lubricated vacuum pump. The separator includes a hollow housing having one end disposed adjacent the suction opening of the pump and the other end adapted for attachment to a vacuum line. A valve seat comprises an internal surface of the housing, and a resilient elastic sealing element having a relatively low mass is positioned under tension on the valve seat between the seat and the suction opening. The sealing element permits a stream of air from the vacuum line to enter the suction opening of the pump while preventing oil from the pump from passing into the vacuum line.

Abstract: A rotary vacuum pump is provided with a housing having a cylindrical chamber. A rotor having a plurality of slideably mounted vanes is mounted within the chamber by a shaft extending through an eccentric bore. Hydraulic oil delivered to the rotor under pressure urges the vanes against the chamber walls. Escaping oil lubricates and seals the vanes and also lubricate the rotor shaft.

Abstract: A window for vehicle cabs, especially for vehicles employed in agriculture and in the construction industry, which window is provided with a pane pivotally connected to the vehicle by two upper joints. The pane is at its sides by inner supporting members respectively and selectively held in opened and closed position. The joint members provided on the pane side are exclusively on the inner side of the pane bridged by a transverse yoke member which extends approximately over the upper length of the pane. The transverse yoke member is at its ends provided with lateral legs extending approximately half way down the pane. These legs are operatively engaged by the supporting members.

Abstract: The invention concerns an apparatus for tensioning restraining devices, such as safety belts. The tensioning is effected by a piston arranged to move within a cylinder when actuated by a pressure medium. A return stopping device is provided to maintain tension after actuation.