Abstract: In a method for producing helical coils, in particular for coil screens, a filament is conveyed in a filament conveying direction through a first channel portion of a first rotation body, and subsequently conveyed through a second channel portion of a second rotation body which rotates synchronously with the first rotation body. The filament is subsequently wound around a protruding winding mandrel, such that a helical coil is produced from the filament by a continuous feed of the windings of the filament wound around the winding mandrel. A heated heating fluid flows with an excess pressure through the first channel portion and the second channel portion, arranged downstream, and in the process heats the filament conveyed through the first channel portion and subsequently through the second channel portion. The filament emerging from the second channel portion is deformed, using a deformation apparatus, prior to winding onto the winding mandrel.

Abstract: A method for operating a rail vehicle in a railway system includes providing at least one optical waveguide which is laid next to at least one railway track and into which light pulses are fed, using the optical waveguide as a distributed acoustic sensor, and detecting backscattered light. In order to configure such a method in such a way that it meets stringent safety requirements relatively easily, a rail vehicle is used having a sound generator which can be adjusted in terms of its frequency spectrum in such a way that it indicates an emergency. When the sound generator is activated, an emergency signal of the rail vehicle is acquired if a frequency spectrum which corresponds to the adjusted emergency frequency spectrum of the sound generator is detected in the backscattered light. A railway system is also provided.

Abstract: A method for operating a rail vehicle in a railway system includes providing at least one optical waveguide which is laid next to at least one railway track and into which light pulses are fed, using the optical waveguide as a distributed acoustic sensor, and detecting backscattered light. In order to configure such a method in such a way that it meets stringent safety requirements relatively easily, a rail vehicle is used having a sound generator which can be adjusted in terms of its frequency spectrum in such a way that it indicates an emergency. When the sound generator is activated, an emergency signal of the rail vehicle is acquired if a frequency spectrum which corresponds to the adjusted emergency frequency spectrum of the sound generator is detected in the backscattered light. A railway system is also provided.

Abstract: A method for checking the serviceability of a heater of a set of switch points of a rail network includes determining the position of the switch points, detecting the thermal radiation emitted by the switch points, and transmitting the value of the measured thermal radiation and/or a value derived therefrom to a maintenance control center.

Abstract: The invention relates to a method and a device for producing coils (9) with longitudinal sections (9a) and narrow deflection bends (9b) by winding wires (8) on winding mandrels (4) with complementary cross sections with the supply of heating energy and subsequent fixing by cooling. To attain the object to rule out the spring rebounds of the coils (9) at the points of narrowest radii of curvature as far as possible and to produce coils (9) with high precision with high efficiency, it is proposed according to the invention that the heating energy is brought to act on the coils (9) at least mainly in the region of the narrow deflection bends (9b). This can be carried out by the targeted application of heating gases or hot air, laser radiation, contact heating, plasma radiation and ultrasound.

Abstract: A door leaf includes a stiff, light structural part that maintains fed-in vibrational energy and, by flexural waves, propagates this energy in at least one active surface perpendicular to its thickness to distribute resonance mode vibration components over at least one surface, which has specified, preferred locations or sites within it for transducer devices, which are affixed on the structural part at one of the locations or sites to set the structural part into vibration and to allow it to resonate, thus creating an acoustic radiator that delivers an acoustic output signal when it vibrates in resonance, the front and/or the rear cover panel of the door leaf being part of the stiff, light structural component. The transducer(s) is/are situated between the cover panels.

Abstract: A method and a device for producing helical screens by winding wires made of plastic into individual spirals, which are inserted into each other in an overlapping way in the transversal direction on a working surface and are united parallel to each other into permeable sheet materials by fixing wires. In order to achieve the task to provide a method and a device with which screen belts with spirals and fixing wires can be produced with low personnel, energy and investments costs (equipment costs) and low amounts of waste with high precision and reproducibility with low time effort, the invention proposes for the spirals to be deposited on winding devices by means of moveable joining devices next to each other on the work surface after winding and to be engaged on said work surface by transverse displacements and connected to each other by the fixing wires.

Abstract: A pressing apparatus having a pressure plate (6) for the hot pressing of materials (5) of the following group: laminates, wood materials, wood-plastic materials, chip and flake boards, wood, paper, film and pulp combinations for floors, walls and ceilings, has at least one heated platen (3), and at least one resilient lining (10) is situated between the platen (3) and the pressure plate (6). In order to achieve short cycling time, uniform pressing action, high and uniform thermal gradients, avoidance of air inclusions and cold spots, and long useful life, with low numbers of rejects, the following solution is proposed: a) The pressure plate (6) has on the side facing the platen (3) at least one lining (10) firmly adhering to the pressure plate (6) and made of a thermally conductive, resilient plastic, and b) the pressure plate (6) is in contact with its lining (10) against the platen without any air gap. With it, material up to a size of 6 m×9 m and over can be hot-pressed perfectly.

Abstract: The invention relates to an electromagnetic driver comprising a soft magnetic core in the form of an E with three legs and a back, an alternating field driver, magnetically coupled to the soft magnetic core, for generating an alternating magnetic field in the soft magnetic core, depending upon a sound signal, a constant field driver magnetically coupled to the soft magnetic core for generation of a constant magnetic field in the soft magnetic core, a soft magnetic element for coupling to the plate of the planar diaphragm loudspeaker, lying opposite the back and magnetically closing the legs across at least one small induction gap, whereby the constant field and the alternating field are asymmetrically superimposed such that a resulting force, or a resulting torque on the soft magnetic element, is proportional to the sound signal.

Abstract: The invention relates to so-called panel loudspeakers (11) working according to the multiresonance principle. Said loudspeakers are generally formed by a core layer (13) and at least one outer layer (14.o, 14.u). The outer layers (14.o, 14.u) are connected to the core layer (13). A periphery is also provided (12) enclosing the panel loudspeaker (11) at a lateral distance (A). The panel loudspeaker is connected to the periphery (12) by means of connecting elements (17, 17?). Although good reproduction results can be obtained in the mid and high audio frequencies with the panel loudspeakers (11) described above, undesired large panel surfaces are known to be required for good low frequency reproduction. When such panel surfaces are not used, the lowest panel resonances ensuring bass reproduction are shifted towards the midfrequencies. Hence, the invention aims at providing a panel loudspeaker (11) exhibiting improved acoustic reproduction in the low frequency range despite a relatively smaller panel surface.

Abstract: A door leaf includes a stiff, light structural part that maintains fed-in vibrational energy and, by flexural waves, propagates this energy in at least one active surface perpendicular to its thickness to distribute resonance mode vibration components over at least one surface, which has specified, preferred locations or sites within it for transducer devices, which are affixed on the structural part at one of the locations or sites to set the structural part into vibration and to allow it to resonate, thus creating an acoustic radiator that delivers an acoustic output signal when it vibrates in resonance, the front and/or the rear cover panel of the door leaf being part of the stiff, light structural component. The transducer(s) is/are situated between the cover panels.

Abstract: The invention relates to an electromagnetic driver comprising a soft magnetic core in the form of an E with three legs and a back, an alternating field driver, magnetically coupled to the soft magnetic core, for generating an alternating magnetic field in the soft magnetic core, depending upon a sound signal, a constant field driver magnetically coupled to the soft magnetic core for generation of a constant magnetic field in the soft magnetic core, a soft magnetic element for coupling to the plate of the planar diaphragm loudspeaker, lying opposite the back and magnetically closing the legs across at least one small induction gap, whereby the constant field and the alternating field are asymmetrically superimposed such that a resulting force, or a resulting torque on the soft magnetic element, is proportional to the sound signal.

Abstract: The invention relates to a planar loudspeaker comprising a light, thin soundboard (2) which may be energized to produce multiply-reflected bending waves, a surrounding frame (3) holding the soundboard (2) in an articulated, shear-resistant manner; at least one driver (6, 7, 9, 10) connected to the soundboard (2) to energize the soundboard (2); and at least one bridge (13, 16, 18, 20, 22, 25), rigidly connecting the at least one driver (6, 7, 9, 10) to the frame (3), wherein the bridge or at least one of the bridges (13, 16, 18, 20, 22, 25) is connected to the damping board (14).

Abstract: A flat panel loudspeaker arrangement with several panel loudspeakers of similar construction is disclosed. The panel loudspeakers are arranged seamlessly side-by-side and are rigidly connected with one another along their respective edges with a high shear strength. The panel loudspeakers can be supported by an existing stable wall.

Abstract: The invention relates to an electromagnetic driver comprising a soft magnetic core in the form of an E with three legs and a back, an alternating field driver, magnetically coupled to the soft magnetic core, for generating an alternating magnetic field in the soft magnetic core, depending upon a sound signal, a constant field driver magnetically coupled to the soft magnetic core for generation of a constant magnetic field in the soft magnetic core, a soft magnetic element for coupling to the plate of the planar diaphragm loudspeaker, lying opposite the back and magnetically closing the legs across at least one small induction gap, whereby the constant field and the alternating field are asymmetrically superimposed such that a resulting force, or a resulting torque on the soft magnetic element, is proportional to the sound signal.

Abstract: A door leaf includes a stiff, light structural part that maintains fed-in vibrational energy and, by flexural waves, propagates this energy in at least one active surface perpendicular to its thickness to distribute resonance mode vibration components over at least one surface, which has specified, preferred locations or sites within it for transducer devices, which are affixed on the structural part at one of the locations or sites to set the structural part into vibration and to allow it to resonate, thus creating an acoustic radiator that delivers an acoustic output signal when it vibrates in resonance, the front and/or the rear cover panel of the door leaf being part of the stiff, light structural component. The transducer(s) is/are situated between the cover panels.

Abstract: A flat panel loudspeaker arrangement with several panel loudspeakers of similar construction is disclosed. The panel loudspeakers are arranged seamlessly side-by-side and are rigidly connected with one another along their respective edges with a high shear strength. The panel loudspeakers can be supported by an existing stable wall.

Abstract: The invention relates to a method for guaranteeing an identical message sequence in several data sinks, according to which several data sources transmit data messages in parallel and independently of one another to said data sinks. To guarantee an identical message sequence, according to the invention a clock-pulse generator delivers a predefined consecutive clock-pulse generator number to all data sources at constant cycle intervals, for example 50 ms, said number being transmitted together with a message counter number that is consecutive during the cycle interval and with the message content to all data sinks.

Abstract: A pressing apparatus having a pressure plate (6) for the hot pressing of materials (5) of the following group: laminates, wood materials, wood-plastic materials, chip and flake boards, wood, paper, film and pulp combinations for floors, walls and ceilings, has at least one heated platen (3), and at least one resilient lining (10) is situated between the platen (3) and the pressure plate (6). In order to achieve short cycling time, uniform pressing action, high and uniform thermal gradients, avoidance of air inclusions and cold spots, and long useful life, with low numbers of rejects, the following solution is proposed: a) The pressure plate (6) has on the side facing the platen (3) at least one lining (10) firmly adhering to the pressure plate (6) and made of a thermally conductive, resilient plastic, and b) the pressure plate (6) is in contact with its lining (10) against the platen without any air gap. With it, material up to a size of 6 m×9 m and over can be hot-pressed perfectly.

Abstract: A tweeter with a light, thin sandwich plate which can be excited into multiple reflected bending waves, and a driver which makes a vibrating contact and excites the sandwich plate, where the driver is designed for higher sound frequencies and the sandwich plate for propagating bending waves with low damping. The sandwich plate is freely carried with low damping by holding elements, where the latter are designed to be low damping at higher sound frequencies.