Abstract: The invention relates to a platform door system comprising cover elements and sliding doors arranged along a platform for opening and closing passages between the cover elements, wherein the sliding doors when in a closed state are displaceable into different door positions along the platform, and wherein a given sliding door can then be opened and closed starting from a given door position into which the given sliding door has been displaced.

Abstract: A brake apparatus has a base plate and a first brake disk movable in an axial direction. The apparatus also has a second brake disk positioned remote from the base plate relative to the first brake disk. A brake operating device is connected essentially torsion-proof with the first and second brake disks and is positioned between the base plate and the first and second brake disks. A friction lining is positioned between the first and second brake disks and is carried on an input shaft in a torsion-proof manner relative to the shaft. The input shaft is rotatable relative to the base plate. A sleeve type spacer has a fastener passing through the sleeve. The sleeve is adjustable in the axial direction to keep a distance between the first and second brake disks. The sleeve and the fastener axially retain the second brake disk at the selected distance from the first brake disk during operation of the brake apparatus.

Abstract: A sealing arrangement is provided for a shaft rotatably mounted in a housing which is operable in an abrasive media such as sandy sea water or the like. The sealing arrangement includes a main seal and an auxiliary seal fitted around the shaft with a chamber formed between these seals for accommodating a separating medium. The chamber includes a feed opening and supply arrangement for continuously communicating pressurized separating medium, such as air or clean water to said chamber. An outlet opening is provided at the bottom of the chamber for accommodating exhaust of abrasive media which may accumulate in the chamber during non-operating conditions. The separating medium supply and exhaust, as well as the configuration of the auxiliary seal is such as to assure continuous escape of a portion of the separating medium through the auxiliary seal during operation, thereby preventing ingress of the surrounding abrasive medium into the chamber during operations via the auxiliary seal.