Abstract: In order to impart an adequate functional stiffness to a steering wheel comprising an injection-molded skeleton made of partly crystalline thermoplastic plastic, the skeleton of the steering wheel has a press-stretched structure.

Abstract: A method of manufacturing a steering wheel, in which a coating layer is molded of a synthetic resin, by using a molding die unit, on at least the annular portion of a steering wheel core including a boss. The annular portion is located around the boss and has a groove extending in the circumferential direction thereof. Spokes couple the boss and the annular portion to each other. The method includes a die opening step in which an upper molding die and a lower molding die, which have a gate formed at the separation surfaces of the dies and communicating with the molding cavity of the die unit, are opened from each other.

Abstract: In an automotive vehicle provided with an inflatable gas bag for protection of an occupant in the event of collision, the improvement wherein the bag is made of a plain-weave woven fabric of synthetic threads and having a top and a bottom, the woven fabric having a sett of 16 to 23 threads per cm, its threads having a denier of at most 470 dtex, low-shrinkage threads being in the bottom of the gas bag and extensive thread being in the top of the gas bag.

Abstract: The hub and spoked of a steering wheel consist of a synthetic thermoplastic resin and just as the rim are covered with a layer of a deformable plastic. To provide a steering wheel which is light in weight and has a high temperature stability, the hub and spokes consist of a polyamide which has been modified with elastomers and fibers.

Abstract: An apparatus and method is described for automatically folding airbags a plurality of times in stages of predetermined width. Both longitudinal and lateral folds may be accomplished. A plurality of inward and outward folding bars are automatically positioned relative to the airbag and transferred to interleaving positions to fold the airbag.

Abstract: In a piston and connecting rod assembly for internal combustion engines, which assembly comprises a spherical small end portion, which is movably mounted in a recess of the piston head and in a retaining ring and which is connected to the skirt of the piston, the load-carrying capacity of the piston, which consists of a pressure-cast aluminum alloy, is increased in that the piston is reinforced by fibers, and a ring carrier which has open pores and is embedded in the ring-carrying portion and is connected thereto by a metallic bond, and a collar serving as an abutment for the retaining ring is integrally cast with the piston skirt on the inside thereof.

Abstract: In a cast linerless single cylinder or multicylinder block made of an aluminum alloy and intended for use in internal combustion engines, the aluminum matrix contains embedded silicon particles, which protrude from the sliding surface of the cylinder. In order to distinctly reduce the cost of the mechanical machining of the entire surface of the single cylinder or multicylinder block, only the sliding surface of the cylinder is constituted by a fibrous body which contains interspersed silicon particles and infiltrated aluminum alloy.

Abstract: In a pressure-diecast light alloy piston, a ring carrier made of a metallic material having pores filled by the piston materials is embedded in the piston casting adjacent to the first ring groove. In order to provide a strong joint to the piston base body, the ring carrier consists of cold-compacted chips of austenitic cast iron and there is a metallic bond between the chips and the piston material.

Abstract: In an apparatus of manufacturing diaphragms, a layer of a difficulty flowable metal powder is applied to a support, a wire net is rolled onto the powder layer and the latter is compacted at the same time and the metal powder is fired at 800.degree. to 1500.degree. C. in an oxidizing atmosphere. In order to impart to the diaphragms a constant thickness, strength and density, the metal powder is uniformly distributed and applied as regards its bulk volume to the support and the powder layer is moved under a distributing roller rotating opposite to the direction in which the powder is fed.

Abstract: In order to have a sufficiently large elongation at fracture in conjunction with high strength values, a pressure-diecast steering wheel skeleton consists of an aluminum alloy which is composed of______________________________________ 2.5 to 3.5 % by weight magnesium 0.10 to 0.30 % by weight silicon 0.40 to 0.60 % by weight iron 0.25 to 0.45 % by weight manganese 0.015 to 0.05 % by weight copper 0.035 to 0.085 % by weight zinc balance aluminum.

Abstract: In a light alloy piston for use in diesel engines for an indirect fuel injection, a body of fibrous material is embedded in the cast piston head and is formed with a shallow combustion recess. In order to improve the conduction of heat outside the portion formed with the combustion recess, the body of fibrous material has a larger height on the side that is formed with the combustion recess than in the remaining portion of the piston head.

Abstract: The gas bag apparatus for protection against impact is adapted to be integrated in the steering wheel or instrument board of motor vehicles end consists of the collapsed gas bag, the bowl-shaped generator carrier, which is connected to the gas bag and accommodates the solid-fuel-operated gas generator, and the covering, which is made of elastic plastic and covers the gas bag and is clipped to the generator carrier. In order to reduce the weight the generator carrier consists of thermoplastic which is reinforced with glass mats.

Abstract: In a light alloy piston for internal combustion engines the mounting for the piston pin is designed for heavy loads. The piston comprises piston pin bosses which are integrated in the skirt of the piston and provided with an inelastic block support. In order to reduce the weight those end faces of the piston pin bosses which face the small end of the connecting rod are outwardly setback below those segments of the top apex portions of the bosses which include an angle of less than 180 degrees.

Abstract: In order to ensure in sliding surface bearings a uniform distribution of the load over the bearing metal layer, a phosphate layer serving as a sliding layer has been applied to the bearing metal layer.In order to ensure a high resistantce to scuffing, the sliding layer is formed from an aqueous phosphating solution which contains 1.5 to 5.0 g/l Zn, 12 to 24 g/l Na, 11 to 22 g/l P.sub.2 O.sub.5, 17 to 33 g/l 16 to 30 g/l BF.sub.4, 20 to 39 g/l B(OH).sub.3 and 1.0 to 6.0 g/l NaF.

Abstract: In a pressure-diecast light-alloy piston for internal combustion engines, which piston comprises shaped fibrous bodies which are partly embedded in at least one of the piston head, ring zone, piston pin bosses and skirt of the piston, which bodies comprise short ceramic fibers, lying in a common plane and in said plane having a random orientation, the improvement wherein the piston (1) is made of a high-temperature magnesium alloy, the piston skirt at least on its sliding surfaces has a chemically applied or electrodeposited metallic sliding layer (3) which has a thickness of about 10 to 30 .mu.m and a hardness of about 740 to 850 HV.sub.0.01, and the inside surface of the piston is coated with a thin plastic paint layer (2) or an anodized magnesium oxide layer.

Abstract: A component which is to be installed for an absorption of energy with an ideal displacement-compressive force characteristic consists of a prismatic straight metal rod, which is long relative to its transverse dimensions and is adapted to inelastically buckle in the direction of the axis of its larger principal moment of inertia under an axially acting compressive load and is provided with spur teeth, which extend transversely to the longitudinal direction and are provided on at least one of the broadsides, which extend at right angles to the axis of the larger principal moment of inertia.

Abstract: A material for composite sliding surface bearings having a plastic sliding layer comprises a metallic backing layer and a sliding layer that is joined to the backing layer and consists of a matrix-forming fluorine-containing polymer, in which a metal powder having a high affinity to fluorine is finely dispersed. In order to reduce the friction torque and the wear rate, the fluorine-containing polymer contains metal fluoride and metal oxyfluoride and consists of monoclinally crystallized PVDF, amorphous PVDF and a novel polymer, which in an X-ray diffractogram prepared by CuK .alpha.-radiation has a sharp intensity peak at a double Bragg angle of 2.theta.=18.07.+-.0.03.degree. and has a melting range of 320.degree. to 350.degree. C. and is free of ortho-rhombically crystallized PVDF.

Abstract: A material for composite sliding surface bearings having a plastic sliding layer comprises a metallic backing layer and a sliding layer that is joined to the backing layer and consists of a matrix-forming fluorine-containing polymer, in which a metal powder having a high affinity to fluorine is finely dispersed. In order to increase the life, a fluorine-containing polymer is provided, which in an X-ray diffractogram prepared by CuK.alpha.-radiation has a sharp intensity peak at a double Bragg angle of 2.theta.=18.07.+-.0.03.degree. and has a melting range of 320.degree. to 350.degree. C. and contains metal fluoride and metal oxyfluoride.

Abstract: The gas bag apparatus for protection against an impact is adapted to be integrated into the steering wheel or instrument board of motor vehicles and comprises a covering, which is made of elastic plastic and connected to the carrier for a gas generator. The cover of the covering has exactly defined rated break lines and the covering comprises a peripheral annular frame, which is secured to the carrier and is connected by hingelike joints to the cover sections which are defined by the rated break lines. In order to eliminate the need for a reinforcement, the covering consists of a one-piece injection molding which is made of a thermoplastic elastomer.

Abstract: An installable component which serves to absorb energy and is intended to be used with steering wheels of motor vehicles having a steering wheel hub which is recessed from the rim of the steering wheel consists of a plurality of deformable metal rods, which have parallel axes and are arranged in a circle and at each end are firmly interconnected by a metal flange. In order to improve the energy absorption performance the metal rods are adapted to buckle in the direction of the larger principal moment of inertia under an axially acting pressure force, and at least one of the broadsides, which extend at right angles to the axis of the larger principal moment of inertia and include a right angle with the radius of the installable component, is provided with spur teeth, which extend transversely to the longitudinal direction.