Abstract: A rapid opening valve assembly has a housing in which there is positioned a cylinder body slidably receiving, in a cylinder chamber, a valve piston which maintains the valve assembly in an open or closed state. The valve piston has an axial extension which constitutes a spindle and which is received in a spindle chamber formed in the cylinder body. The valve piston is urged into the closed position by a spring, the force of which is opposed by the pressure in the high pressure side of the valve assembly, seeking to move the valve piston away from its seat. In the valve piston there is provided a servochamber which receives a slidable servopiston cooperating with a servovalve seat also carried by the valve piston. The servopiston is urged against its seat by a servospring, the force of which is opposed by the cylinder chamber pressure admitted to an end face of the servopiston through a channel provided in the valve piston.

Abstract: A matrix to be used for fabricating disc shaped record carriers is produced by illuminating a photolacquer layer with a laser beam while the layer moves transverse to the beam axis and by controlling the beam so that it simultaneously produces a succession of spots modulated according to the information recorded and a continuous strip narrower than the spots and serving to provide a track guide for the scanning element of a playback device with which such a record carrier is to be used.

Abstract: A rapid shutoff extraction check valve has a movable valve body cooperating with a valve seat that divides a valve housing into an upstream housing chamber communicating with the valve inlet and a downstream housing chamber communicating with the valve outlet. The movable valve body is displaceably supported by an actuating piston which is slidably received in a guide cylinder enclosing a pressure chamber. The actuating piston has a radial face exposed to pressure in the downstream housing chamber. An auxiliary valve forming part of the rapid shutoff check valve has a first position in which communication is maintained between one housing chamber and the pressure chamber and a second position in which the pressure chamber is vented. In the first position of the auxiliary valve the actuating piston exerts a closing force on the movable valve body.

Abstract: In the manufacturing of a coaxial cable wherein conductors are continuously wound about support sleeves introduced in succession to a winding station, there is provided a slotted guide tube accommodating the support sleeves in an end-to-end axial series and leading to the winding station and a feeding mechanism which projects through the tube slot for engaging and advancing the support sleeves.

Abstract: To prolong the useful life of a diamond guide element which serves to guide a transducer and which is provided with a contact surface via which the element in use bears against the surface of a record carrier while the carrier moves relative to the element, the element is constructed so that the direction of such relative movement corresponds to a high wear resistance direction of the diamond, and the contact surface thereof is periodically ground in an opposite direction in which it has a lower wear-resistance.

Abstract: The invention is an improved detector system for determining and indicating the level of a molten charge within a furnace. The system can determine the level of the charge without the need for having contacts or other sensing devices within the furnace by sensing impedance changes in the furnace's heating coils.

Abstract: An electrical conductor of the type having a central cavity which extends along the longitudinal axis of the conductor to conduct refrigerating fluid which cools the conductor heated by high current density current flow whereby, to increase thermal efficiency and decrease deposits on the walls of the cavity which reduce the lifetime of the conductor, the cavity walls have non-smooth undulations, forming for example isosceles triangles.

Abstract: A grinding foil which is to be used for grinding a record cutting or playback stylus is manufactured by providing a surface layer of a plastic foil with indentations for accommodating a grinding agent in granular form, filling the indentations with such grinding agent, and thermoplastically deforming the surface layer to smooth the foil surface and to bond the grinding agent into the surface layer.

Abstract: A method for producing a welded and quench hardened steel pipe and pipe whereby the weld seam running spirally or longitudinally along the pipe length has a lower austenization temperature than the pipe and/or a higher electrical resistance. The ratio of the pipe to seam resistance is preferably greater than one half and the whole of the square of the ratio between pipe wall thickness and mean seam thickness. The seam preferably includes amounts of C, Si, and Mn in the same percentage as the pipe plus nickel between 2-6%.

Abstract: A valve particularly for controlling the admission of fluid to sectional nozzles of a turbine has a slidable valve sleeve provided with a control face. The valve sleeve is surrounded by a stack of valve rings fixedly held in the sequentially housing. Each valve ring has a circumferentially extending axial extension with which it engages an adjoining valve ring of the stack. Each axial extension has at least one discontinuity to define a port between any two valve rings. Ports associated with different valve rings communicate with different nozzle sections. As the valve sleeve is moved in one direction, its control face equentially opens the valve ports associated with the different nozzle sections.

Abstract: A playback device for disc-shaped record carriers containing video signals stored in the grooves thereof which includes an arrangement which, in response to an applied power pulse, displaces the pickup, during playback, by a number of groove widths transversely to the direction of the groove.

Abstract: Apparatus for inductive hardening of the bearings of crankshafts by a rotational process, wherein various parts of the surface of the workpieces are heated by variably shaped inductors, and wherein the workpiece is loaded horizontally with a hardening carriage, which supports a transformer plate for supporting a transformer connected to a medium frequency current source and an inductor attached to the transformer plate, and an automatic control to move the transformer plate to load and unload separate inductors for treating variably shaped workpiece surfaces.

Abstract: An improved hardening apparatus of the type having a main carrier shaft which mounts pairs of indexing spiders which hold workpieces during treatment which includes quenching in a bath. The shaft is developed hollow and provided with a spur gear near one end which functions as a sunwheel of planetary gears. The hollow shaft is provided with perforations in the area of the spur gear through which it extends to engage the tailstock gear which is flanged to the housing surrounding the shaft.

Abstract: A matrix, which is to be employed for pressing foil disc copies carrying a spiral groove which is highly concentric to the axis of disc rotation, is formed by electrodeposition from a lacquer foil original which is cut to form a groove corresponding to such spiral groove and to form additional grooves deeper than the spiral groove and having a form that produces, on the matrix, sharp edges capable of directly cutting the outer periphery and center hole of a foil disc copy.

Abstract: In a process for making a printed circuit, a method of forming a base for the circuit, including coating a cover foil with a decomposable film, then bonding the film to a carrier, and then removing the cover foil from the film.A protected base useful for making printed circuits, comprising a synthetic-resin-based carrier, a decomposable adhesive film bonded to the carrier, and a removable cover foil bonded to the film, the adhesive film containing catalyst effective for the electroless deposition of metal conductors.

Abstract: A at discharge oven for heating a large number of production parts which pass through the oven on a conveyor belt and are pushed by a pushing mechanism mounted att the oven, evidence whereby the conveyor belt is attached to a swingable beam and a vibrator is mounted for exerting a force on the belts and parts thereon which has a component in a direction perpendicular to the direction of part movement through the oven.

Abstract: An apparatus for inductive hardening different types of production parts, such as automobile axles, in a device of the type having a pair of rotatable spiders with a plurality of arms for clamping therebetween the parts for indexing movement from a clamping station to a releasing station, the parts being sequentially presented to the clamping station by a lifting bar conveyor. The type of part presented for clamping and type of part which the arms at the clamping station can clamp are compared and the part only clamped when the types are the same.

Abstract: In a pickup for the playback of a high density signal recording stored at the surface of a record carrier, which pickup includes a scanning element and a mechanical-electrical pressure transducer connected to the scanning element by a layer of adhesive, undesired vibrations of structural parts of the pickup during playback are prevented by providing at least that part of the surface of the pickup where the pressure transducer is connected to the scanning element with a layer of a hardened casting mass, which is applied in the liquid state in which it has a viscosity of between 5 and 50 cP at 20.degree.C. Preferably, the remainder of the surface of the pickup is also covered with such a coating, with the exception of the scanning surface of the scanning element.

Abstract: A demodulation system of a playback device for a carrier frequency signal containing both useful information in the zero passages of the signal and signal break-ins which occur in the playback device. The system includes a limiter for limiting in an asymmetrical manner a signal fed to it and a demodulator coupled to the output of the limiter. A highpass filter is connected between the limiter and the demodulator so as to couple the output signal from the limiter to the demodulator. The highpass filter substantially passes only the useful information portion of the carrier signal and suppresses any break-ins introduced into the signal.

Abstract: A pickup system for playing back signals stored on the surface of a carrier in a form providing an optically detectable property which varies as a function of the time pattern of the stored signals, the storage being constituted by undulations or variations in the reflectivity of the carrier surface and the pickup system employing a laser beam which is reflected in a manner controlled by the stored information. The system includes a laser radiation generating element forming part of an optical resonator which also includes the carrier surface so that the intensity of radiation oscillations in the resonator is influenced by the surface and varies as the carrier moves relative to the laser element. The system also includes an output member for converting such intensity variations into an electrical signal representative of the stored signals.