Abstract: A one-leaf or two-leaf sliding door, swinging/sliding door or pocket door, particularly for vehicles, has an electric, pneumatic or hydraulic drive. A nut is attached to the at least one door leaf and a spindle extends through the nut. A drive for moving the at least one door leaf is provided either to rotate the spindle directly or to linearly move the at least one door leaf. A freewheel is mounted on an end of the spindle, wherein the freewheel has a component which is stationary relative to but capable of rotating together with the spindle. A releasable brake or clutch is provided for preventing rotation of the freewheel component.

Abstract: A lateral seal for sieve devices with a grate having a plurality of grate bars which are alternately movable and immovable with respect to the side walls of the sieve device. Flexible sieve elements are fastened to the grate bars and extend across the gaps between the grate bars. The flexible sieve elements are moved or tensioned and relaxed by the movable grate bars. The lateral seal is formed of flexible material and is connected to the sieve elements and to the side walls. The lateral seal includes sealing leaves which overlap one another in an imbricated manner. Each sealing leaf extends in the sieving direction between two adjacent stationary grate bars.

Abstract: The invention concerns a screening apparatus comprising two frame systems which are movable relative to one another, comprising grate bars assigned to each system, which grate bars of each frame system are alternately disposed and are connected by means of flexible screen elements which are fastened at the latter, bridge the distance between the bars, and are tensioned and relieved of tension by means of the relative movement of the two systems caused by means of an eccentric shaft which is supported exclusively at the two systems and rotated by means of a drive. This known construction is improved, according to the invention, in that the eccentric shaft is arranged at one end of the two systems (1, 7) and the latter are connected with one another at a distance from this end by means of an element (12) which ensures a substantially linear relative movement of the two systems relative to one another. The aforementioned distance preferably corresponds to the distance of the acceleration pole (P.sub.

Abstract: The invention is directed to a penumatic or hydraulic drive for opening and closing of doors, in which the linear motion of a double-acting piston 5 driven by a pressure medium is converted into a rotary motion of a spindle 2 through a piston rod 6 and a helical gear box 3. Herein a blocking lever 10 supported in a stationary manner is provided, which in the closed position of the door engages under the action of a spring 18 at a part 11 connected with a piston 5, wherein said blocking lever secures the piston in its end position and is held in its open position counter to the force of an additional spring 15 by a power cylinder 14 acted upon by the pressure means.

Abstract: Rotary drive, particularly for vehicle doors, in which the piston motion of a piston-power cylinder-unit 5 is converted into a rotary motion by means of roller pairs 14 which engage into oblique slots 10, 11. The oblique slots are provided in cylinders 4, 6 arranged coaxially inside each other and one of the cylinders is connected to the power output shaft 7. The slots exhibit an axial direction at their ends. Herein the cover 2 of a pot-shaped housing 1, through which cover the power output shaft 7 passes, exhibits a collar 15 projecting outwards and embracing the power output shaft. The power output shaft 7 is provided with a cup-type seal 17 seated firmly upon it, whose surface contour 18 overlaps outwardly the collar 15 and which with its edge 19 rests tightly at the cover 2. The cover is provided with an axially oriented groove 20 on its side facing away from the collar, into which groove the edge of the pot-shaped housing 1 is tightly fitted.