Abstract: A brush, rotatably arranged in a cleaning device for cleaning surfaces, is described. The brush includes a core element and brush elements arranged on the core element. The brush elements are arranged in a bristle field extending in a direction of a longitudinal axis of the brush and in a peripheral direction about the longitudinal axis. Further, the brush elements include fiber hairs. Furthermore, a linear mass density of at least tip portions of the brush elements is lower than 15 g per 10 km. In addition, an average of a packing density of the brush elements in the bristle field is lower than 15,000 brush elements per 1 cm2 so as to ensure that for the purpose of moving the brush during a cleaning action, only a relatively small amount of energy is needed.

Abstract: A polymer composition made by combining a polyketone polymer and a phenolic alkylene dicarboxylate of the general formula: ##STR1## each R.sup.1 independently is hydrogen or alkyl with 1-6 carbon atoms, each R.sup.2 independently is alkyl with 1-6 carbon atoms,each m is an integer of 0-4, andn is an integer of 2-12; anda process for preparing these compositions.

Abstract: Polymer composition made by combining a polyketone polymer and a monophenolic compound of the general formula: ##STR1## R.sup.1 and R.sup.2, independently, are hydrogen or alkyl groups with 1-6 carbon atoms,Y is an organic group from 3 up to 15 carbon atoms.

Abstract: In a non-destructive method the state of ageing of plastic products is determined by means of infrared radiation, which is passed through the product.The invention is based upon the discovery that there is a clear relationship between certain physical and/or chemical changes occurring during the course of time in the interior of plastic materials, detectable by infrared analysis, and the mechanical properties of the product. On the basis of this relationship, the method may be used to decide whether products can be safely used or whether they must be disqualified and removed.The method is particularly well suited with crates which are to contain bottles; the radiation is then passed through a crate wall.Apparatus for performing the method may be arranged in a line such as a conveyor belt bottling line.

Abstract: The invention relates to a slatted blind having vertically arranged slats, in a bottom pocket of which a slat weight is maintained by means of an end piece mounted at each end of the weight.

Abstract: The invention relates to a locking mechanism for a vertically slatted blind. The locking mechanism rides in the top rail which also supports the slats. The locking mechanism is operated by flexible tension members.

Abstract: A vertical venetian blind including a driving shaft, a plurality of slat travellers each having a driven shaft and a slip coupling for connecting the driving shaft to the driven shaft, and a plurality of slats each connected to a driven shaft. The slip coupling includes a bushing mounted on the driving shaft to rotate with and to slide along the driving shaft, and a worm tightly enclosing the bushing and having a screw thread. The driven shaft includes a worm wheel and two stop cams for contacting ends of the screw thread. The worm can slip with respect to the bushing when the driving shaft rotates and one end of the screw thread contacts one of the cams or the other end of the screw thread contacts the other stop cam.