Abstract: In a process for extruding polymer melts (25) to form hollow chamber sections (21) by pressing the polymer melt through a shaping tool (24) with an internal shaping mandrel (26) and by subsequently sizing and cooling the hollow chamber section strand in a sizing and cooling unit (31) it is provided for the sizing and cooling of the hollow chamber section strand to be carried out in the sizing and cooling unit under extrusion pressure. A device for carrying out this process is characterized in that shaping tool (24) and sizing and cooling unit (31) are rigidly connected to form a closed system so that the strand extrusion pressure prevailing in the shaping tool can be propagated into the sizing and cooling unit, and that the shaping mandrel (26) protrudes out of the shaping tool (24) into the sizing and cooling unit (31).

Abstract: A work spindle for a machine tool. The work spindle has a spindle guard tube, a clamping arrangement, a clamping force generator, which is arranged on the spindle guard tube and operates the clamping arrangement, and which has at least one first cylinder chamber enclosed by a first cylinder housing and a first piston, in such a way that a large band width of different clamping forces may be generated simply. The clamping force generator has a second cylinder chamber enclosed by a second cylinder housing and a second piston. Additionally, for operation of the clamping arrangement, both cylinder chambers are always subjected to a pressurized medium. Furthermore, to generate different clamping forces, the clamping force generator is switchable over from a first working mode, in which at least the first piston operates the clamping arrangement, into a second working mode, in which at least the second piston operates the clamping arrangement.

Abstract: In order to improve a stencil holder for stencils made of metal films, preferably for screen printing, comprising a frame, at least two stencil receiving means arranged on the frame and detachably holding the stencil and a stencil tensioning device, with which the stencil can be tensioned in at least a first tensioning direction, such that the stencil can be tensioned as evenly as possible, it is suggested that the stencil have holding strips extending on from a stencil section, that these holding strips extend at the most over the respective length of an edge of the stencil section in the respective longitudinal direction thereof, that each holding strip be detachably securable on a respective stencil receiving means and that the stencil be tensionable in a first tensioning direction and a second tensioning direction extending transversely to the first by means of the stencil tensioning device acting on the stencil receiving means.

Abstract: A threaded cable joint for a cable having a cable shield enclosing an internal conductor region. The cable joint, which may be connected to a housing, has a connection piece and an outer pressure element. The outer pressure element is screw-connected to the connection piece, and acts on a seal to cause the seal to abut against the cable as the cable passes through the threaded cable joint. A number of shield contact elements are arranged within the connection piece, and in electrical contact with the connection piece. The shield contact elements include conductive contact bows that extend in the direction of the passed-through cable for contacting the cable shield at a first contact point, thus forming a direct electrical connection between the cable shield and the connection piece.

Abstract: In order to render possible the ablation to different depths in a process for correcting the shape of a lens in which the surface of the lens is acted upon by the radiation of a pulsed radiation source through a shutter in specific regions exposed by the shutter and thereby removing material from the lens by the radiation effect during the impingement of each radiation pulse, wherein the radiation is concentrated in a bundle of rays, the cross section of which is smaller when striking the lens surface than that of the lens surface exposed by the shutter, and wherein the bundle of rays is moved such that the entire lens surface exposed by the shutter is irradiated by radiation pulses consecutively impinging on the lens surface, it is suggested that the bundle of rays is moved between successive radiation pulses only to such an extent that the regions of the lens surface struck by the radiation pulses consecutively impinging on the lens surface partially overlap.

Abstract: An auxiliary data signal is transported with a primary data signal by hiding the auxiliary data signal in the form of colored noise. The colored noise has a spectrum that simulates the spectrum of the primary data signal. By adjusting the gain of individual spread spectrum signal carrier(s) and the power of the colored noise, the auxiliary information stream(s) can be rendered at any desired level below or above an interference threshold in the primary data signal. The power of the colored noise is further compensated to account for a cross-correlation between the primary data signal and the auxiliary data signal to enhance the recovery of the auxiliary data at a decoder.

Abstract: To improve a machine tool, comprising a machine frame, a workpiece holder arranged on the machine frame for a workpiece to be machined, a tool holder arranged on the machine frame for receiving a tool and at least one drive with a slide for executing a relative movement between the tool and the workpiece in the direction of at least one axis, such that it allows as high dynamics as possible, it is proposed that the drive comprise electric linear motors aligned parallel to the axis and spaced from one another in a transverse direction, that the slide extend between the two linear motors, and that a control be provided for simultaneously operating the linear motors for displacement of the slide.

Abstract: Auxiliary data is transported in a primary data signal by hiding the data in the form of colored noise. The colored noise has a spectrum that simulates the spectrum of the primary data signal. The data to be transported is first converted to a spread spectrum signal. The primary data signal is analyzed to determine its spectral shape. The same spectral shape is imparted to the spread spectrum signal, which is then combined with the primary data signal for transmission. The spectral shaping can be performed using time domain modeling and synthesis such as linear predictive coding or by using subband coding techniques such as fast Fourier transforms. A plurality of different auxiliary information streams can be transported on the primary data signal. By adjusting the gain of individual spread spectrum signal carrier(s) and the power of the colored noise, the auxiliary information stream(s) can be rendered at a desired level at, below or above an interference threshold in the primary data signal.

Abstract: An improved pressure vessel which has a fluid flowing through it can be simply manufactured and has a high operational safety. The fluid may be heated by radiation, such as solar radiation. A guiding device with inlet and outlet stream guides is arranged in the interior of the pressure vessel to guide a stream of the fluid. The inlet stream guide and the outlet stream guide are separate from one another, and are formed in the vessel interior by the guiding device. The stream of fluid is guided from the inlet stream guide to the outlet stream guide. Additionally, a branch stream of the stream of fluid is returned from the outlet stream guide to the inlet stream guide via a passage of the guiding device due to a lower pressure that is created in the inlet stream guide.

Abstract: In order to provide a simple and inexpensive laying aid for floor covering elements, in particular ready-made parquet flooring, laminated or floor panels, it is suggested that the laying aid be designed in the form of a belt tensioning device with a belt and have a shaped part on both sides, that each shaped part have a receiving means for the belt, that each shaped part have an arm with a projection which can be fixed at a groove or a tongue of the floor covering elements by engaging in it and around it, respectively, and that when the arm is fixed in such a manner the receiving means be positioned such that the belt is guided by this close to the floor covering elements.

Abstract: In order to improve a bending machine comprising a bending beam, a first and a second clamping beam for clamping a workpiece, one of which has clamping tool segments arranged so as to be interchangeable, wherein at least one clamping tool segment with a movable base has a base part mounted on an upper part and movable relative thereto from a clamping position into an insertion position and vice versa, in such a manner that such a clamping tool segment with a movable base can be handled more easily it is suggested that a drive means free from supply lines for the movement of the base part be arranged in the upper part of the clamping tool segment with a movable base, that the drive means have an energy-receiving element for supplying drive energy to an activating device arranged on the bending machine during contact with an energy input element.

Abstract: In order to improve a bending machine comprising a lower beam with a lower beam tool, an upper beam with an upper beam tool, wherein the upper beam tool and the lower beam tool are movable relative to one another for clamping a workpiece, as well as a bending beam pivotable about a pivot axis and having bending beam tool segments arranged on it, each of which has a pressure surface segment, wherein a bending beam pressure surface acting on the workpiece during bending can be made up of the pressure surface segments, such that it is possible to vary a width of the bending beam pressure surface in a simple manner it is suggested that at least one bending beam tool segment be designed to be adjustable and that the pressure surface segment of the adjustable bending beam tool segment be movable from an active position, in which it contributes to the pressure surface of the bending beam tool, into an inactive position, in which it is without effect during a bending operation.

Abstract: In order to improve a lathe, in particular, a multiple-spindle lathe, comprising at least one workpiece spindle arranged on a machine frame and rotatable about a spindle axis, this workpiece spindle projecting with its front end into an operating area, and a tool slide with a longitudinal slide element guided for displacement in Z-direction parallel to the spindle axis in a longitudinal guide means located outside the operating area and arranged on a slide stand of the machine frame and with a cross slide arranged in the operating area and displaceable in X-direction transversely to the spindle axis in relation to the longitudinal slide element, this cross slide being guided on a cross slide guide means arranged at a front end of the longitudinal slide element and movable by means of a cross feed gear, such that the tool slide as a whole is constructed in as space-saving a manner as possible and, in particular, requires little space in the operating area in order to create the possibility of using several too

Abstract: To improve a strap clamping device comprising a clamping strap forming an outer loop to wrap around one or several workpieces, and a tightening device for tightening the outer loop to clamp the workpiece or workpieces, such that it is operable in as convenient a way as possible, it is proposed that the tightening device comprise a base element supported on the loop with a guide opening through which the loop is guided, that the tightening device include a pull element, that the pull element and the base element be moveable relative to each other by means of an adjusting device, and that the loop run between the base element and the pull element and engage the pull element such that upon relative movement of the base element and the pull element, the outer loop is tightenable under the effect of a double pulley.

Abstract: A secondary packetized data stream, such as a commercial, is spliced with a primary packetized data stream, such as a network television program. The system does not require decompression of the data in the primary data stream, and is particularly suitable for use at a cable system headend to allow the insertion of commercials from local businesses into a nationally broadcast television program. When a start signal is received, a pre-splicing packet of the primary stream is determined. The pre-splicing packet is the packet closest to the start time which carries an anchor frame (e.g., I or P frame) start code. To prevent a potential discontinuity at the decoder, the pre-splicing packet is processed to discard the anchor frame data, and to insert a number of stuffing bytes which is equal to the number of bytes discarded into an adaptation field of the pre-splicing packet.

Abstract: In a saw for surgical purposes comprising a saw blade holder movable by a motor and a saw blade fixable in the saw blade holder, to enable insertion and removal of the saw blade without a tool, it is proposed that the saw blade holder comprise an insert guide for the saw blade with a holdback projection, that the saw blade carry a resilient detent projection which in a relaxed position, with the saw blade inserted in the insert guide, engages the holdback projection from behind, and that an actuating element be mounted on the saw blade holder for displacement against the resilient detent projection, the actuating element moving the resilient detent projection, during the insertion, into a tensioned position in which the detent projection is pushable past the holdback projection when the saw blade is pulled out of the saw blade guide.

Abstract: A thermal insulating or fire retardant construction element (1) is described, consisting of outer layers (5,6) of glass fibre reinforced concrete and a mineral wool layer (4) between the outer layers (5,6). At the back of the panel (1) a cavity (7) is formed to permit circulation of air between the panel (1) and the wall therebehind. A lead-through duct is also described for leading a smoke pipe from a fireplace to a chimney through the element, the external face of the duct communicating with the air space behind the element.

Abstract: In an apparatus for treating an article comprising a treatment bridge with a head beam which is arranged above the article and two side beams which are arranged at the sides of the article and extend transversely to the head beam, and delivery devices which are arranged on the beams for respectively directing at least one treating agent at the article, in order to improve the transportability of the bridge, it is proposed that the side beams of the bridge be pivotable from a working position in which they stand transversely to the head beam to a resting position in which they are arranged parallel to the head beam.

Abstract: A device for mechanically securing an article against theft is suggested, wherein the device comprises a first holding component with a securing surface for securing to an object, a second holding component for securing to the article, a cable connecting the two holding components and connecting components respectively associated with the holding components and having undercut sections for providing a releasable, form-locking holding connection of the two holding components. A very simple handling of the device is achieved by the fact that at least one of the connecting components comprises an undercut section with a mating surface inclined in relation to the securing surface such that the holding connection can be released by means of a releasing force acting at right angles to the securing surface.

Abstract: To allow easy replacement of tools in a surgical punch with a tubular shaft, the distal end of which forms an annular cutting edge, a cutting member is mounted for longitudinal displacement in relation to the shaft, interacts with a cutting edge, and is held on an advancing element mounted for displacement in the shaft. An actuating member, arranged at the proximal end of the shaft, displaces the advancing element in the shaft. The cutting member is releasably connected to the advancing element and/or a sleeve bearing the cutting edge to the shaft. The releasable connections are provided using radially and elastically displaceable projections or detents on one part which engage behind recesses on the other part in a locking position and thereby secure the parts inserted into one another in an axial direction against any separation.