Abstract: The present invention relates to a silenced blowing nozzle for blowing of a static gas medium under overpressure, in particular air, having in a central part (6) of the nozzle at least one first discharge opening (11) embodied to generate a core stream of gas with supersonic velocity. The central part is surrounded by a more peripheral part (5) containing a number of second discharge openings (13) spaced from each other and from said first discharge opening(s), the said second discharge openings being embodied to generate a gas flow with lower velocity than the core stream, preferably a velocity equal to sonic velocity, which gas flow surrounds the core stream and has the same direction as said core stream.

Abstract: An apparatus for producing a flexible heat-exchange device for taking heat from or delivering heat to the ambient surroundings, wherein the device includes a body comprised of mutually joined flexible mats and including an internal passageway for the heat-carrying fluid. The apparatus includes two mould dies which can be brought together and have on their mutually opposing surfaces generally mirror-image patterns in the form of recesses in the respective abutment surfaces of the tools, the recesses corresponding to the extension of a flow passageway, and two mat joining tools which can be brought together and have on their mutually opposing surfaces a generally mirror-image pattern in the form of abutment surfaces that form the electrodes of the mat joining tools, wherein the electrodes are disposed in a pattern corresponding to the delimitations of the flow passageway, and the electrodes can be connected to a high frequency welding unit.

Abstract: A method of producing a flexible heat-exchange device including a body having a flexible mats and an internal passageway for heat-carrying fluid, an inlet and an outlet, including placing first and second plastic elastic mats in a mould die having supporting surfaces and recesses around the supporting surfaces, separating the first and second plastic elastic mats by a resilient counterdie, bringing the mould dies together with the first and second plastic elastic mats separated by the resilient counterdie into contact wherein the first and second plastic elastic mats are stretched down around abutment surfaces by deformation of the resilient counterdie and around the support surfaces and down into the recesses so as to obtain local plastic deformations as the mould dies are brought together, placing the second plastic elastic mat over the first plastic elastic mat, and mutually joining the first and second plastic elastic mats to form the body.

Abstract: A single two-ended echo canceller is provided that uses an adaptive FIR filter to model the impulse response of the echo path and cancel the echo originating from the PSTN side of the connection, and a non-linear processor controlled by input signal levels to cancel the echo originating from the mobile phone side of the connection. Since the linear processing function is not used for cancelling echoes of the mobile phone side, the algorithms directed to estimating and cancelling echoes on the two sides of the connection can be executed in a single DSP, with all of the attendant advantages.

Abstract: A coupling for a vehicle steering unit includes a first linking section including two leg portions extending from a hub portion and a second linking section including two wings extending from and integrated to the hub portion and protrusions on the wings pierced with holes for the passage of a tightening bolt for tightening the wings to bear radially on a shaft. The wings are terminated at a longitudinal slot extending substantially in parallel to an axis of rotation of the coupling. This longitudinal slot is wide enough to allow the passage of the shaft.

Abstract: A tilting and/or telescopic steering column assembly includes a mounting bracket fixed to a vehicle body, a movable bracket supporting a steering column, a clamping bolt passing through bolt holes of the mounting bracket and movable bracket, and an operating lever for clamping the movable bracket immovable between the left and right side walls of the mounting bracket by turning a clamping nut on the clamping bolt. For tilting and/or telescopic adjustment, the bolt hole of at least one of the mounting and movable brackets is elongated, and fringed with a toothed portion. A lock member is mounted on the clamping bolt, and is formed with a toothed portion for engaging with the toothed portion of the elongate hole. In one practical example, the bolt holes are both elongated and fringed with a toothed portion, and the lock member comprises of a first member for engaging with the toothed portion of the mounting bracket and a second member for engaging with the toothed portion of the movable bracket.

Abstract: An interface circuit between a four wire line and a two wire line includes correlator and control circuit means connected for receiving a longitudinal signal (V.sub.1) and a transversal signal (V.sub.t) corresponding to a differential signal received on the terminals of a two wire interface from the two wire line. The correlator and control circuit includes a circuit for creating a correction signals being a measure of the correlation between the longitudinal signal and the transversal signal. The circuit for creating the correction signal is connected for using this correction signal to adaptively control the amplifications in feed back loops so as to minimize the correlation between the longitudinal and transversal signals.

Abstract: A method and device for compensating the truncation error occurring in a sampled signal during processing in a digital filter. The mean error e.sub.t is calculated for the filter, and before filtering the signal +e.sub.t is added if the signal is positive and -e.sub.t is added if the signal is negative.

Abstract: A mobile working platform, particularly a so-called under-bridge lift, comprising a parallelogram type boom which is horizontally and vertically pivoted to a vehicle and which at its end facing away from the vehicle has a turntable which is rotatable by means of a hydraulic motor and at its circumference supports the angular end of an inner arm which is vertically pivotable by means of a piston and cylinder assembly which is mounted adjacent to the circumference of the turntable approximately diametrically opposite the mounting point of the inner arm. By means of a hydraulic cylinder, the inner arm is vertically pivoted to an intermediate arm which by means of a further hydraulic cylinder is vertically pivoted to an outer arm which vertically pivotally supports a platform or cage. Between the turntable and the platform or cage, motion transfer means in the form of rods and chains extend to keep the platform or cage in a horizontal position independently of the angle of inclination of the boom and arms.

Abstract: A combined sound damper and oil trap for compressed air apparatus comprising an oil trap having a hose or tube (5) which is directly connected to the compressed air apparatus and which at the outer end thereof encloses a scraper sleeve (7), whereby a radial space is formed between the scraper sleeve (7) and the hose or tube. The hose or tube is connected to an oil collector housing (1) whereas the scraper sleeve (7) is connected to a pressure chamber (2) which in turn directly communicates with a filter housing (3) containing a sound damper. The said sound damper comprises both a diffusor plate (11) provided between the pressure chamber and the filter housing (3) and a filter (12) which is mounted at the outlet end of the filter housing. The diffusor plate (11) provides a damping of low frequency noise and a substantially even distribution of the outlet air over the entire diffusor plate, and the filter (12) provides both a separation of oil mist from the outlet air and a damping of high frequency noise.

Abstract: The invention relates to a reference rectifier in a multifrequency signal receiver for obtaining a correct detection of the two signalling frequencies in an incoming voice frequency signal independently of disturbing signals of varying frequency and duration. The rectifier has a first signal path including a peak rectifier for creating a first signal level in dependence on the incoming signal level which is compared with the signal component having a frequency equal to one tone in the incoming voice frequency signal. The rectifier also has a second signal path including a mean value creating circuit which, in dependence on the incoming signal gives a second signal whose level is smaller than said first signal level.

Abstract: A reference signal circuit in a multi-frequency signal receiver for detecting the two signalling frequencies in an incoming voice frequency signal. The circuit has two paths for receiving the incoming signal. One path includes a rectifier and attenuation device to give a first signal level dependent on the incoming signal level. The other path includes a first comparator to compare the instantaneous level of the incoming signal with such first signal level, a timing circuit and a second comparator in order to obtain a second signal level whose amplitude is dependent on the duration of the incoming signal. The outputs of the two signal paths are interconnected via a gating circuit to feed a reference voltage to analog signal comparators included in the multi-frequency signal receiver.