Abstract: A method and apparatus for piecing a yarn in a spinning rotor of an open end spinning device is disclosed wherein an increased quantity of fibers is momentarily fed into the spinning rotor after the yarn is returned to the spinning rotor, whereupon the fiber supply is reduced to the normal supply quantity. Preferably, during termination of the spinning process, fibers are stored between a supply device and a fiber opening device which on commencing the piecing process are suddenly released, while at the same time the fiber supply resumes at the normal rate. For effecting the method an abutment surface (110) is preferably provided in a feed channel (11) on the side of a clamping point (15) of a clamping lever (5) for acting on the feed channel (11) facing away from the opening roller (2).

Abstract: A sealing arrangement for covering and sealing the open space in a constant velocity universal joint includes a sealing boot, one end of which is fastened to the driven part of the joint and the other end of the sealing boot extending axially from the universal joint is fastened to a sleeve which is axially displaceable and is arranged coaxially surrounding a drive shaft connected to the driving part of the joint. A coating of a material having dirt-repellent and/or water-repellent properties or permitting easy sliding is provided on the drive shaft at least in the range of axial displacement of the sleeve relative to the drive shaft.

Abstract: A roving moving to a spinning machine passes between top and bottom input rolls of which the top roll is adapted, upon breakage of the roving, to be raised by a lift member which is movable into engagement with the spindle of the top roll and carries with it a clamping element which serves to clamp the incoming broken end of the roving against the top roll to retain it ready for subsequent rethreading into the nip of subsequent drafting rollers.

Abstract: An open-end spinning apparatus with a spinning rotor having an interior wall, a yarn takeoff channel opening and a fiber feed channel opening communicating with the interior of the spinning rotor. A suction opening (5, 50, 51) is connected to a source of reduced pressure and has its open end directed to the interior wall of the spinning rotor. The suction opening is positioned so that a suction air stream flowing therethrough is separated by a screen from the yarn takeoff channel opening and the fiber feed channel opening.

Abstract: A gear positive displacement machine has a housing, two gear members, and two bearing members supporting the latter. A gap is formed between an inner wall of the housing and a respective one of the bearing member, the gap increasing in two opposite axial directions. It may start from a central transverse plane of the bearing member. The gap may be formed by a convex peripheral surface of the bearing member or by a convex inner wall of the housing.

Abstract: In an adhesive bandage comprising a support and an adhesive layer on the front thereof, the improvement which comprises a thermosetting, water-impermeable lacquer layer on the back of the support, the lacquer layer being less elastic in at least one direction than the support, whereby movement of the body, once the strip has been applied to the skin, will cause cracking of the lacquer layer.

Abstract: The present invention relates to a process for the preparation of polyurethane foams capable of being flame laminated and high frequency welded, comprising reacting:(a) polyisocyanate,(b) a compound having a molecular weight of from 400 to 10,000 containing at least two isocyanate-reactive hydrogen atoms and(c) a dialkoxy-phosphonyl-N-alkyl-formic acid amide of the formula: ##STR1## wherein m represents an integer of from 1 to 3,n represents an integer of from 0 to 8,X represents halogen, hydrogen, C.sub.1 to C.sub.6 alkyl, --OR, or ##STR2## R represents C.sub.1 to C.sub.6 alkyl, R.sub.1 represents hydrogen, C.sub.1 to C.sub.10 alkyl, C.sub.1 to C.sub.10 alkylene, C.sub.6 to C.sub.10 aryl or C.sub.6 to C.sub.10 arylene, andR.sub.2 and R.sub.3, which may be the same or different, represent C.sub.1 to C.sub.10 alkyl in the presence of water and/or blowing agent.The present invention also relates to dialkoxy-phosphonyl-N-formic acid amides.

Abstract: In a process for the rectification of a raw gaseous mixture under superatmospheric pressure and containing at least three components, e.g. natural gas wherein the gaseous mixture is fractionated in a first rectifying column into a head product largely freed of at least one higher-boiling component and into a bottoms product largely freed of at least one lower-boiling component, the improvement which comprises compressing the liquid bottoms product of the first rectifying column; passing resultant compressed bottoms product in indirect heat exchange relationship with the gaseous mixture to at least partially vaporize said bottoms product; engine-expanding resultant vaporized compressed bottoms product to form a liquid which is then passed as reflux into a second rectifying column; and fractionating resultant expanded bottoms product in said second rectifying column to form a top product containing lower-boiling components and into a sump product containing higher-boiling components.

Abstract: A universal joint assembly having a pair of yokes with yoke arms interconnected by a trunnion cross includes a seal member extending between the trunnion cross and a bushing of the assembly, with the seal including a resilient portion defining a lubricant reservoir from which lubricant may be provided for roller bodies of the assembly in order to insure adequate lubrication and long life. The seal is further provided with ribs which define between the seal and the trunnion cross ducts for lubricant flow from the reservoir to portions of the joint assembly including the roller bodies.

Abstract: The instant invention is directed to a method of producing a reaction mixture for forming solid or cellular materials from flowable reactants and, optionally, fillers, comprising premixing the components and, optionally, fillers in a first mixing zone and after-mixing in a second mixing zone, the improvement wherein said after-mixing is carried out in a slit-like annular zone which extends radially from the center, the surface boundaries of said annular zone are not parallel and one of said surface boundaries is rotated while the opposite facing surface boundary remains stationary.

Abstract: A gear positive displacement machine has two meshing gear members each having two axially opposite shafts, two pairs of bearing members each of which pairs bears one shaft of both gear members, at least one sealing member at one axial end of the gear members, and a supporting element reinforcing this sealing member. The supporting element has a U-shaped cross-section with two arms and a bead at a free end of each arm. The sealing member is inserted by its base side in the supporting member, and the beads of the arms of the latter engage in two grooves formed in the supporting member.

Abstract: The instant invention is directed to a process for the production of elastic polyurethane foams capable of being flame laminated and high frequency welded, comprising reacting(a) polyisocyanates with(b) polyethers having a molecular weight of from 400 to 10,000 and having at least two hydroxyl groups and(c) hydroxy-pivalic acid neopentylglycol ester of the formula: ##STR1## used in a quantity of from 1 to 20% by weight, based on the hydroxyl polyether, in the presence of a blowing agent.The instant invention is also directed to the polyurethane foams prepared thereby.

Abstract: A gear pump or a hydraulic gear motor has two pairs of meshing external gears, in which the teeth of one of the gears of each pair of gears are circumferentially displaced with respect to the teeth on the other gear of the pair. The gears arranged on the drive shaft are connected by the latter by an internal gearing, especially by splines, whereby the number of the teeth of the internal gearing is an even multiple, especially twice, the number of the external teeth of these gears.

Abstract: In a sealing arrangement for the open space in a homokinetic universal joint formed of an outer joint member defining an interior hollow space and an inner joint member positioned within the hollow space, a sealing boot assembly includes a single part or plural part boot. The assembly includes a ring having a cylindrical inner surface mounted on the outer spherical surface of the outer joint member. When a two-part boot is used, one end of each part is fixed to the ring and the other end is secured to one of the driving or driven parts extending from the universal joint.

Abstract: For fiber dressing an antistatic, heat-stable fiber lubricating agent, which contains a compound of the formula ##STR1## in which R.sub.1 denotes a C.sub.8 -C.sub.22 alkyl or alkenyl group, R.sub.2 denotes a C.sub.8 -C.sub.22 alkyl or alkenyl group or a C.sub.1 -C.sub.4 alkyl group and R.sub.3, R.sub.4 and R.sub.5 denote identical or different C.sub.1 -C.sub.4 alkyl groups is used.

Abstract: A bearing assembly for use with a motor vehicle wheel includes an inner sealing ring located within an outer sealing ring, and a constant velocity universal joint located within the inner bearing ring for driving a wheel hub. A contact seal is positioned between the spherical outside surface of the outer joint member of the universal joint and the inside surface of the inner bearing ring. The contact seal extends in the axial direction of the universal joint and has one end fitted into a groove in the inside surface of the inner bearing ring. A plurality of sealing lips extend inwardly from the inner surface of the contact seal into contact with the spherical outside surface of the outer joint member. The lips are spaced apart in the axial direction of the universal joint and extend perpendicularly to the spherical outer surface of the outer joint member. A reinforcing ring laterally encloses the outer surface of the contact seal.

Abstract: A method of and apparatus for operating a dosing arrangement for good and poorly flowing loose material such as pulverized material, granular material, and similar material having different specific weights, flow properties, and other properties. The dosing arrangement is operated volumetrically, has a dosing device, such as a worm, which is provided with a controllable or variable drive, and has a gravimetrically operable measuring device which is combined with a belt conveyor which follows the dosing device in sequence and is provided with a similarly controllable or variable drive. The drive for the dosing device and/or belt conveyor is adjusted prior to the start of a dosing process in such a way that a predetermined ratio exists between the two drives for achieving, independent of a preset conveying thickness, a desired thickness of the load of the conveyor belt in relation to the drive speed of the conveyor belt.

Abstract: A flame-resistant polyurethane foam is obtained by treatment of the foam with a mixture of aluminium hydroxide and a carboxyl group-containing polychloroprene latex and cross-linking the latex with zinc oxide or magnesium oxide.

Abstract: An improved transmission-type, scanning charged-particle beam microscope including a television camera tube and a television display tube for generating and displaying a diffraction image of a specimen to be examined. The improvement of the invention comprises the provision of a transparent fluorescent screen disposed in the ray cone of the beam behind the specimen along the beam path in the microscope, light-optical means adapted for imaging the fluorescent screen on a target of the television camera tube, and detector means for integrally detecting radiation emanating from the fluorescent screen.

Abstract: Secondary amines of the formula ##STR1## wherein R.sub.1 is a straight-chain or branched alkyl, alkenyl or ethylenically multi-unsaturated hydrocarbon radical having from 8 to 26 C atoms, R.sub.2 is a straight-chain or branched alkyl, alkenyl or ethylenically multi-unsaturated hydrocarbon radical having from 1 to 26 C atoms, X is an alkylene radical selected from the group --CH.sub.2 CH.sub.2 --, --CH(CH.sub.3)--CH.sub.2 --, or --CH.sub.2 --CH(CH.sub.3), and y is a number from 1 to 20, are prepared from aliphatic nitriles and aliphatic alcohols in the liquid phase in the presence of hydrogenation-dehydrogenation catalysts at elevated temperature. They are valuable intermediates, for example for the manufacture of softeners for textiles, of components for organophilic ammonium bentonites and also of microbiocides, especially for combating bacteria, fungi and algae.