Abstract: Detachable screen cloths (14) are fixed on a screen cloth element (11) having a rigid support frame (12, 13) serving as a holder and intended to be fixed in the screen frame (10) of a screening machine. The detachable screen cloths (14) have a rigid screen cloth frame (30, 31) surrounded at least partially by elastomeric material. The rigid mounting frame (12, 13) of the screen cloth element has a guide device (32, 33) which is laterally open for receiving and holding the screen cloth (14). The screen cloth (14) is in sliding engagement with the guide device (32, 33) during the insertion thereof into the guide device. The screen cloth (14) and the guide device (32, 33) have inter engaging surfaces preventing, during the screening operation, relative movements between the screen cloth (14) and the rigid mounting frame (12, 13) of the screen cloth element in directions making an angle with the plane of the screen cloth.

Abstract: A conveyor belt scraper device has at least one scraper blade which is mounted in an undercut mounting recess in a supporting element. The scraper blade is retained in the undercut recess by inwardly directed flanges defining the opening of the recess. One end of the scraper blade forms a scraper tip and the other end has a substantially complementary shape with respect to the mounting recess and is inserted therein. The long sides of the scraper blade have mounting grooves for holding the inwardly directed flanges. According to the invention, the scraper blade has a longitudinal slot extending from the end surface of the scraper blade through a considerable distance outwards beyond the flanges of the mounting recess towards the scraper tip. A T-shaped stiffening member is inserted in the longitudinal slot for stiffening the scraper blade. The invention also relates to a scraper blade of this design for use in the conveyor belt scraper device.