Abstract: An arrangement in vertical sewage system pipes for preventing rodents, such as rats, from entering dwellings, living accommodation, office accommodation, and similar building structures. The arrangement includes a frame which is L-shaped in cross-section with an outwardly extending flange sealingly inserted in a joint between two mutually adjacent pipe sections and an axially extending flange to which are attached a plurality of springing wires or rods so as to form a wire cone which tapers in the direction of sewage flow. The springing wires or rods terminate at the apex of the cone in anear touching relationship. The wires or rods are made of stainless steel with a wire gauge of from 0.7 to 2.5 mm or of fiber glass with a wire gauge of from 0.8 to 2.0 mm.

Abstract: A method for cooling and lubricating rolls and/or the rolled material in cold rolling of metal strips in a rolling mill stand. The method includes supplying emulsifiers as necessary and emulsions which contain at least one oil phase. The emulsion is prepared immediately in front of the rolls of the rolling mill stand or immediately in front of the strip inlet into the rolling gap formed by the work rolls by separately supplying the media which form the emulsion. Subsequently, the emulsion is collected behind the rolling mill stand and the emulsion is broken up and the liquid phases are separately processed and reused for forming the initial emulsion.

Abstract: Considerable difficulties are encountered in fixing holding devices for objects to or into motor vehicle interior parts made from foamed material, such as e.g. mirrors to sun visors. It is therefore proposed to provide on the holding devices, sinking pins with passage openings and cross-pins, which are driven through the passage openings into the foamed material.

Abstract: A method of determining the spring characteristic of a roughing and finishing stand and a method of adjusting the roll gap of the roll stand prior to rolling, particularly for rolling lightweight sections with narrow tolerances, wherein at least one horizontal roll of the stand is adjustable. The stand has a swingable stand top which connects the housing posts of the stand housings, wherein the stand top is connected to the housing posts by tie rods which are pretensioned by a hydraulic tensioning device. At least the upper of the horizontal rolls is moved by an electromechanical adjustment unit of the rolls towards the other roll and the rolling forces to be measured between the roll bodies is applied by the hydraulic tensioning device, wherein the electromechanical adjustment unit is adjustable by predeterminable adjustment distances in the unloaded state while maintaining roll contact.

Abstract: An information signal recording apparatus arranged to form a recording track on a recording medium by recording an information signal on the recording medium, in which the information signal is recorded on the recording medium in such state that a first tracking control signal, for effecting a first tracking operation during reproduction, is superimposed thereon, in the case where a stop of the recording track forming operation is not instructed, and the information signal is recorded on said recording medium in such state that a second tracking control signal, for effecting a second tracking operation during reproduction, is superimposed on the information signal, depending upon a timing when the stop of the recording track forming operation is instructed, whereby a position where the first tracking operation becomes impossible on the way of effecting the first tracking operation during reproduction is detected, so that a position of the step of the recording track forming operation on the recording medium c

Abstract: A pump for conveying liquids and gases is formed by a drive motor having a stator (1) and a rotor (2). Helically shaped conveying grooves (3) are formed in the rotor (2) so that the rotor also serves as the shaft for the pump.

Abstract: An arrangement for making, proportioning, discharging and storing small clear ice bodies includes at least one freezer unit for continuously producing small ice bodies from water. An insulated housing arranged undernearth the at least one freezer unit for the immediate storage of the small ice bodies includes means for revolving the small ice bodies and for conveying the small ice bodies to an outlet opening in the bottom of the housings. The intermediate storage housing has a bottom plate which is inclined toward the outlet opening. A pipe screw is provided for revolving and conveying the small ice bodies. A unit for proportioning and filling includes a filling chamber arranged underneath the outlet openings. A bag storage housing is arranged underneath the intermediate storage housing and includes at least one inlet opening which is positioned in the region of the proportioning and filling unit. The bag storage housing has at least one opening for removing the filled bags.

Abstract: An implant for the jawbone includes a shaft portion and a conical retention portion which is provided with displacement projections. The displacement projections are sickle-shaped retention wedges which are provided on the retention portion located opposite each other. Since the retention portion is conical and the retention wedges result in an oval cross-section, the implant can be inserted into the prepared alveolus having the same shape and a rotation of at most 90.degree. results in locking of the implant in the interradicular alveolar bone to provide primary stability.

Abstract: A rotating head type reproducing apparatus for reproducing an information signal with rotary heads from each of many recording tracks formed in parallel with each other on a tape-shaped record bearing medium including a cylinder member arranged to have the tape-shaped record bearing medium wound around the cylinder member at a wrap angle which is at least ##EQU1## wherein "n" represents an integer at least 3, a number "n" of rotary heads arranged to revolve around the periphery of the cylinder member at a phase difference of 360.degree./n from each other, an arrangement for reproducing the information signal by selectively using one by one signals reproduced respectively by the "n" number of rotary heads; and an arrangement for controlling the positions of the "n" number of rotary heads relative to the record bearing medium by using at least one of signals reproduced by an (n-1) number of rotary heads other than one of the "n" number of rotary heads which is in use by the reproducing arrangement.

Abstract: An arrangement for the catalytic oxidation of the harmful components in a cooled carrier gas from a technical process. The arrangement includes two parallel gas ducts which are connected at one end through a bend and whose other ends are connected to gas lines for the carrier gas and for purified gas. The gas ducts are connected to each other through a three-stage thermal energy return unit. The exchanger stage of the thermal energy return units are arranged spaced from each other and are composed of individual heat tubes whose number increases from exchanger stage to exchanger stage. The size ratio of the heat-exchanging surfaces of heating part to cooling part of each exchanger stage decreases in flow direction of the carrier gas from exchanger stage to exchanger stage. The catalyst is integrated in the gas duct for the carrier gas immediately downstream of the heating part of the last exchanger stage.

Abstract: A method is disclosed for the preparation of tetraalkyl-tin wherein tin-tetraacetate is first dispersed in tetrahydrofuran and trialkyl-aluminum is slowly added to the dispersion in an amount sufficient to cause complete reaction. The reaction is carried out at a temperature of <80.degree. C. The reaction mixture is then heated to the reflux temperature of the tetrahydrofuran for about 1 to 2 hours and until complete reaction. The aluminum triacetate is then removed and the tetrahydrofuran is distilled off.

Abstract: An assembly of a tubular shaft member (3) preferably of fiber-reinforced plastics material and a hub member (1), the hub member having formations (5, 6) which engage the internal surface of the shaft member, and further having a surface between the formations so as to define an annular space. Passages communicate with such space at the end thereof of greatest resistance to adhesive flow, for injection of adhesive into the space and release of air therefrom, the configuration of the space causing a flow of adhesive during injection thereof which effectively drives all air out of the space. The space is configured, e.g. by being of varying radial dimension, to provide an increasing resistance to flow of adhesive in the space from one end of the space to the other.

Abstract: The invention relates to a hydrodynamic torque convertor with a bridging coupling and a torsion spring arrangement. In the power path behind the torsion spring arrangement there is an auxiliary gyratory mass which makes it possible to reduce the vibration-related balancing-out process to a very low speed level.

Abstract: The invention is directed to an apparatus for continuous fabrication of laminates comprising several layers of at least partially resin impregnated material webs which are extruded together. The material webs are taken off supply coils in the take off units and are subsequently stacked upon each other. The stacked material webs are then extruded into a laminate web in a double band press with application of area pressure and possibly heat. The laminate web is subsequently further processed in a grinding and cooling arrangement located downstream of the double band press, which consists of a grinding station and cooling station combined into one single device. Downstream of the grinding and cooling arrangement is a reel up arrangement for winding the laminate web upon supply coils or a transverse cutting station for subdivision of the laminate web into plates or panels.

Abstract: A gearwheel attached to an expanded tube portion in a force-locking way, and including at least one plate metal disc member having a cylindrical hub portion on which a supporting ring is slid which has a yield strength higher than that of the tube portion, and at least one gear ring attached to the disc member.

Abstract: A method of connecting pipes of plastics material of a double pipe system and a pipe connection made by the method. The inner pipes of the pipe system are connected to each other with a sleeve member by welding or gluing. Clamping jaws are used for holding and moving the inner pipes toward each other. The outer pipes are shorter than the inner pipes at least by the thickness of the two clamping jaws. For bridging the gap between the outer pipes, an expandable intermediate ring is inserted in the gap. An electric welding sleeve is used for connecting the outer pipes and the intermediate ring.

Abstract: Polyethers are disclosed which contain perfluoroalkyl groups and have the average formula ##STR1## wherein R.sup.1 is the same or different in the polymer mixture and represents hydrogen or a fluoro group,n has an average value of 4 to 12,a has an average value of 0 to 4,m has an average value of 2 to 18,x has an average value of 2 to 50 andy has an average value of 0 to 3.A method for the synthesis of the new polyols, which are usefull as surfactants and, with respect to the compounds of formula I, as polyol components in the synthesis of polyurethanes, is also disclosed.

Abstract: A copolymer is disclosed which acts as a thickening agent for aqueous preparations having a pH of more than 5.5. The copolymer is obtainable by emulsion polymerization in an aqueous medium, at a pH of 2.5 to 5, in the presence of an initiator forming free radicals, at a temperature of 60.degree. to 95.degree. C. of10 to 50% by weight of acrylic or methacrylic acid,25 to 75% by weight of a nonionic vinyl monomer and2 to 50% by weight of a macromonomer of the formulaCH.sub.2 .dbd.CR--CH.sub.2 --O--(C.sub.n H.sub.2n O).sub.a (C.sub.m H.sub.2m O).sub.b (C.sub.p H.sub.2p O).sub.c HwhereinR is H or CH.sub.3n, p are the same or different and in each case are 2 or 3, with the proviso that n and p have a value of not more than 2.3 in the average molecule,m=a whole number from 12 to 18a=10 to 100,b=2 to 10,c=0 to 10 andwherein the sum of the monomers amounts to 100% by weight.