Abstract: In order to determine the fatigue limit of elastic materials, especially rubber, under completely reversed stress by applying a load which alternates between zero and a maximum value and in order to determine the number of load alternations which leads to the breaking of the material, a plurality of strip-shaped rubber samples are clamped between two stationary clamping beams and a rocker. The rocker is approximately parallel to the beams and is moved at one end thereof by means of a crank mechanism. The rubber samples are each positioned parallel to one another in at least one row and are alternately stretched and relaxed to a different extent, depending on their spacing from the fulcrum of the rocker.

Abstract: A co-oscillating, volume-changing resonator in the form of a silencer, includes a lens-shaped housing formed of a material having a given flexural stiffness, the housing being arched defining an evacuated cup-shaped cavity formed therein, and a coating layer completely surrounding the housing, the coating layer being formed of a material having a flexural stiffness being at most one-third of the given flexural stiffness of the material of the housing.

Abstract: A floor covering, includes a substrate in the form of a resin based laminate having reinforcing fibers disposed therein, and a layer of fire-resistant polysiloxane vulcanized on the surface of the laminate.

Abstract: Sealing web of at least one layer on the basis of mixed polymerizates of ethylene and propylene with or without ter-component (EPDM/EPM). Mixed polymerizates with an ethylene content of at least 50 parts by weight are heat-treated with a reinforcement resin and form through heat treatment an interpenetrating network of chemically non-cross-linked EPDM/EPM and cross-linked reinforcement resin, which can be welded together thermally and/or by dissolving or swelling agents.

Abstract: A flexible hollow body fillable with fluid medium and formed of a double fabric having an upper web and a lower web respectively having an outer surface with a layer of elastomeric material and forming an inflatable chamber therebetween including a coated cover fabric applied to at least one of the layers of elastomeric material, the cover fabric having strip-shaped regions detached from the layer of elastomeric material to which the cover fabric is applied so as to define respective tubular chambers; angular strips disposed within the tubular chambers at respective edges thereof for joining the one layer of elastomeric material and the coated cover fabric to one another; the tubular chambers being formed, respectively, with at least one inlet opening for inflating the tubular chambers.

Abstract: Apparatus for electrostatically flock-coating elongated workpieces on a conveyor belt, wherein flock charged by an electrostatic field drops upon a workpiece from a feed opening located above the workpiece to be flock-coated, and excess flock is collected at the bottom of the apparatus and returned to the feed opening, which includes a stationary cylindrical inner housing having a substantially horizontal longitudinal axis and formed with a feed opening, the feed opening being elongated and located in a region of the cylindrical housing on an upper apex line thereof, the housing being also formed with a discharge gap in a lower region thereof whereat the conveyor belt is simultaneously disposed; a cylindrical outer jacket coaxially surrounding and spaced from the cylindrical inner housing and being rotatable about the inner housing; and elastic transport strips disposed in the space between the inner housing and the outer jacket and fastened to the outer jacket, the elastic transport strips extending along ge

Abstract: The invention relates to a method and device for continuously applying a decorative strip to a rubber profile or section, especially for use in the automobile industry, wherein the decorative strip is inserted into a corresponding groove-shaped recess formed in the surface of the rubber profile or section.

Abstract: Gasket frame made of elastomeric material, in particular made of silicon rubber, with straight gasket profile portions and closed angular corners. At each corner of the gasket frame there is inserted a leg of a metallic angle into the end regions of the gasket profile portions, which are provided with a hollow space extending in the longitudinal direction of said miter-cut gasket portions. The legs are adhesively connected with the corresponding end region of the gasket portions.

Abstract: Device for testing the Shore-hardness of rubber-like (elastomer) bodies, particularly rubber/metal parts, comprising a measuring head with a movable penetrator which can be positioned onto the surface of the rubber-like body, a rotatable circular plate, mounting elements which hold said rubber-like bodies, which are arranged at the circumference of the circular plate, an adjustable holding arrangement for the measuring head, and an actuating device for the measuring head.

Abstract: Two-chamber motor mount with hydraulic damping, especially for vehicles, including an upper and lower chamber having rubber-elastic walls and being filled with liquid, the upper chamber being of hollow conical construction, a holding flange disposed between the walls of the upper and lower chambers, an intermediate plate formed with a throttle orifice located in vicinity of the holding flange, the upper and the lower chambers being connected to one another through the intermediate plate with the throttle orifice for preventing an hydraulic response for high frequency vibrations of small amplitude, the intermediate plate being responsive to high frequency vibrations of small amplitude and the throttle orifice being automatically closeable at high pressures.

Abstract: A vulcanizable rubber mixture which will give the desired properties of leather-hard rubber and can also be extruded with a mixture which gives soft rubber. The composite profile from the extrusion has an area of leather-hard rubber and an area of soft rubber. The composite profile is heated by hot air and/or uhf radiation to 180.degree. to 280.degree. C. and the vulcanized profile cooled very rapidly to 10.degree. to 50.degree. C.

Abstract: A vulcanizable rubber mixture for producing a leather-hard rubber, which mixture is suitable for use in making a composite profile produced by simultaneous extrusion and vulcanization of two different grades of rubber. The composite profile has a region of leather-hard rubber which serves as the clamping part, and a second zone made integrally therewith, of ordinary soft, rubber-elastic rubber. The vulcanizable rubber mixture for producing a leather-hard mixture contains 20 to 40 parts by weight of polar rubber, i.e. rubber which splits off acid groups under vulcanizing conditions, e.g. polychloroprene, and 60 to 80 parts non-polar rubber, i.e. will not split off said groups, e.g. nitrile rubber, 15 to 50 parts phenolformaldehyde reinforcement resin, 0.5 to 4 parts hexamethylene tetramine, and 0.5 to 3 parts sulfur. Conventional accelerators and zinc oxide are added.

Abstract: Molded body of vulcanized rubber having firmly adhering varnish layer produced by applying a coating of varnish which has a compound with a member which will on subsequent vulcanization participate in the vulcanization reaction, to the surface of the unvulcanized molded body. Subsequently vulcanizing the coated molded body to cause the member to participate in the vulcanization and produce a vulcanized rubber molded body with a firmly adhering varnish layer.

Abstract: Production of rubber articles by intensively mixing powdered caoutchouc and additives without vulcanizing accelerators to produce a homogenized caoutchouc mixture. The mixture is formed into semi-finished products which are irradiated with high-speed electrons to produce the rubber articles.

Abstract: A release agent applied to the surface of a mold in the form of a film to permit ready removal of plastic, particularly polyurethane, from the mold. The release agent contains a film-forming substance having an affinity to the plastic and becomes attached to the plastic and is removed with the plastic when taken out of the mold thereby preventing buildup of film-forming substance in the mold. A cross-linking agent and/or a cross-linking catalyst and/or emulsifier and/or tenside may advantageously be incorporated in the release agent.

Abstract: Polyurethane elastomeric foam by foaming a prepolymer or polyisocyanates and compounds having at least two hydrogen atoms reactive to isocyanates, and a chain-lengthening polyamine agent, in the presence of an expanding agent containing a component reactive with the polyamine chain-lengthening agent or with the products of reaction thereof with polyisocyanates, and split-off gas.