Abstract: An electrical connector or terminal block (1) is adapted for mounting on a printed circuit board or the like (2) at a position at least partially concealing a luminous diode (3), the connector containing a light-conductive member (4) that extends from the luminous diode to an exposed surface (5) of the connector, thereby to present a visible indication of the state of operation of the diode.

Abstract: Receiver apparatus is provided for processing frequency hopped signals produced by frequency hopping or hybrid spread spectrum communication systems. A received frequency stepped carrier input signal is applied to dispersive delay lines connected in parallel branches and squaring circuits square the outputs of the dispersive delay lines. A comparator compares the outputs of the squaring circuits and produces an output related to the difference between the these outputs while an integrator integrates, over time, the comparator output and produces a corresponding output voltage signal. A voltage controlled oscillator connected to the output of the integrator produces an output signal whose frequency is related to the output voltage of the integrator. This signal is representative of the instantaneous frequency of the carrier input and can thus be used to demodulate the received signal.

Abstract: A direction finding method and apparatus for a radio signal source, modulated by a digital information signal and existing in a heavy interference environment, is based on cyclic crosscorrelation. The direction finding technique exploits the second order periodicity of a transmitted signal having digital modulation, whereby the technique is immune to narrow-band interference. Radio frequency signals are received by two spaced antennas, and the signal of interest can be considered as a cyclostationary process. The signal time of arrival difference between the two antennas is determined using a cyclic crosscorrelation method. This is implemented by sending the electrical signals, developed by the antennas, through a variable delay device, then to a balanced mixer. The composite signal from the mixer is sent to a band-pass filter whose center frequency is equal to the baud rate of the signal of interest.

Abstract: A method of treating autoimmune diseases by suppressing the immune response of an animal is characterized by administering to the animal a compound of the general formula (1): ##STR1## wherein R.sup.0 and R.sup.1 are radicals selected from the group consisting of hydrogen, hydroxy, alkyl, alkoxy and acyloxy: R.sup.2 and R.sup.3 are radicals separately selected from the group consisting of hydrogen and alkyl; or together, represent a radical of the general formula (2): ##STR2## wherein R.sup.5, R.sup.6, R.sup.7, R.sup.8 and R.sup.9 are radicals separately selected from the group consisting of hydrogen, alkyl, hydroxy, alkoxy, sulfate, and halogen: or R.sup.2 and R.sup.3 together, represent a radical of the general formula (3): ##STR3## wherein R.sup.10 and R.sup.11 both represent hydrogen; or together, represent a valence bond: R.sup.12, R.sup.13, R.sup.14, R.sup.

Abstract: A nutating cone transmission is characterized by a flexible speed control ring for controlling the rotational speed of the cone about its axis. The ring is mounted adjacent to the cone with a portion thereof in contact with and depressed by the surface of the cone. A displacement mechanism laterally displaces the ring relative to the cone while preventing rotational movement of the ring and slippage between the ring and the cone. The position of the ring relative to the diameter of the cone controls the rotational speed of the cone which is delivered to an output. The flexible speed control ring increases the reliability and efficiency of the transmission by eliminating slippage between the ring and damage to the cone through wear.

Abstract: An impact-impeding structure includes a pane which extends along a plane and has a front and a rear side, and an impact-impeding frame for the pane. The frame may include an outer frame member and an inner frame member received in the outer frame member, the frame members being provided at least at one of the front and rear sides of the pane with impact-impeding elements, and defining with one another a labyrinthine gap situated at a region of the impact-impeding elements and including a plurality of steps extending at least substantially parallel to the plane. The parts of the gap which interconnect the steps extend at an angle deviating from the normal to the plane of the pane and may have different widths which may decrease from the exterior to the interior of the frame arrangement.

Abstract: An assembly for supporting an electrical terminal housing on a carrier rail is provided, including a pair of slide members connected with a guide portion of the housing for sliding movement between latched and released positions. The thickness of the guide is slightly greater than the thickness of the slide members to define a gap therebetween. Each of the slide members includes a lower hook portion engaging a leg of the carrier rail when the slide members are in the latched position to connect the terminal housing with the rail, and a spring is connected with the slide members for normally biasing the hook portions toward the latched position. A first abutment is connected with the housing and a second abutment is connected with the slide members, the second abutment being normally vertically offset from the first abutment by a distance corrsponding with the thickness of the gap.

Abstract: Weighing apparatus of the load compensation type includes a source of constant current pulses the duration of which is determined by a regulating signal in response to the position of the load receiver relative to the frame, thereby to maintain the load receiver in an initial or zero position during the application thereto of a load to be measured. The regulating circuit includes a PID regulating amplifier that produces a differential signal (D) and a proportional and integral signal (PI). The PI signal controls the operation of a switch that determines the duration of the constant current pulses, and the D signal modulates the amplitude of the constant current from which the pulses are formed. In this manner of using the differential regulating signal component (D), the influence of various deleterious effects on the weighing apparatus, such as vibration, is avoided.

Abstract: A method for removing color from the caustic effluent produced during kraft pulping and bleaching is characterized by heating the caustic effluent to a temperature and under a pressure sufficient to cause an alteration in the chemical structure of the lignin chromophores in the effluent. The cooked effluent is cooled and has its pressure reduced to near atmospheric pressure. An acid material, such as chlorine extract from the bleaching process, is added to the effluent to lower the pH of the effluent to between 2.6 and 3.8 to initiate flocculation of the altered chromophores of the effluent. During flocculation, the chromophores are continuously separated from the effluent in order to produce a relatively clean and color-free liquid which may be deposited in the sewer system of the pulp mill.

Abstract: A parking brake assembly of the blind-cable-connection type including a backing plate containing an opening, a helical guide spring arranged to guide a flexible resilient inner cable member toward a ramp surface on a parking brake lever for the blind connection to the inner cable member to the lever, characterized in that the angle of inclination of the ramp surface relative to the cable axis is contained in a plane that is both parallel with the longitudinal axis of the lever and that is inclined at an acute angle relative to the axis of the inner cable member. This construction permits the parking brake lever to be simply and economically formed from a blank of flat metal stock, the cable-retaining slot being defined by a slot contained between bifurcated portions of the ramp surface. The helical guide spring includes portions having tightly wound turns, thereby to assist in connecting the spring with the backing plate and/or with the parking brake lever.

Abstract: Electronic weighing apparatus includes an adjusting arrangement for vertically adjusting relative to the scale frame at least one of the resilient bending bearings that supports one end of a guide member of the parallelogram arrangement that guides the load receiver for vertical movement relative to the frame. Preferably, the adjusting device includes a cantilevered resilient auxiliary guide plate arranged in parallel relation between the upper guide member and the frame; the upper guide member being arranged in a recess contained in the adjacent surface of the guide plate. At its end, adjacent the load receiver, the cantilevered guide plate is connected with the frame. At its opposite end, the guide plate extends in spaced relation to the frame, an adjusting screw being provided for vertically adjusting the opposite end portion relative to the frame as well as the bending bearing associated therewith.

Abstract: A cable operating apparatus includes a pawl and ratchet arrangement for maintaining an operating lever in a cable-tensioning position. The pawl is bifurcated to define a pair of pawl tips, the pawl being pivotable in opposite directions for effecting alternate engagement of the pawl tips with the ratchet. The pawl contains a slot that receives the pawl pivot pin and which permits lateral movement of the pawl between a pair of end positions. An overcenter spring arrangement alternately pivotally biases the pawl in opposite directions when the pawl is displaced toward the end positions, respectively. A cam arrangement serves to effect lateral displacement and pivotal movement of the pawl when the operating lever is pivoted from the released position toward a cable tensioning position.

Abstract: An energy absorbing ball comprising a resilient structural outer casing and an energy absorbent core, characterized in that the core is formed of a non-resilient deformable material adapted on rolling to move relative to the casing. The core may comprise, in part, a low viscosity liquid and a surface active agent. The inner surface of the casing is smooth and the deformable material consists by volume of from 40-70% of the core volume, thereby to provide an average deviation on striking of less than 0.21 meters per meter run.

Abstract: A dispensing container formed of flexible material includes a dispensing aperture through which material is dispensed upon manipulation of the container to open the dispensing aperture. A dispensing-sheet composed of an elastically resilient material includes slits which form the dispensing aperture. The dispensing-sheet is attached to the interior surface of the container and is initially covered by a removable portion of the container.

Abstract: A serial terminal block includes a housing of an insulating material, including at least one lateral closing wall having at least one free zone at an internal side thereof. Printed strip conductors are provided on the free zone for the surface mounting of electrical/electronic elements. The printed strip conductors are photomechanically printed. The electrical/electronic elements are glued and soldered to the strip conductors in a soldering bath. The free zone is flat. The insulating material housing consists of a material which is resistant to temperatures of up to 200.degree. C., such as epoxy resin or a ceramic material.

Abstract: This invention relates to an increase in the low longitudinal resonance frequencies of microwave transmission lines known as symmetrical lines, comprising two coplanar and parallel narrow conductive strips. According to the invention, the line further comprises a longitudinal and wide planar conductive strip which is parallel to one of the narrow strips at a sufficient distance not to substantially disturb the characteristic impedance of the initial symmetrical line and which is connected to the narrow strip by small planar end conductors thereby forming a longitudinal flat cavity. The cavity offers a first resonance frequency much greater than those of the initial symmetrical line and consequently affords a higher useful frequency bank of signals to be transmitted. The end conductors allow the line to be connected to coaxial connectors. In other embodiments, the cavity is divided into several resonant sub-cavities in order to raise the pass-band.

Abstract: A remote control operator for a game-calling device includes a push-pull cable connected at one end with the game-calling device and a trigger/pistol combination connected with the other end of the device for axially displacing the inner core member of the cable relative to the outer sheath thereof. The inner core is connected at one end with the actuator of the game calling device and at the other end with the trigger member of the displacement mechanism. The outer sheath is fixedly connected with the housing of the game-calling device at one end and at the other end with the pistol. Upon operation of the trigger, the inner core is axially displaced relative to the outer sheath, thereby to provide a push-pull operation to the acutator member of the game calling device. Upon operation of the actuator of the game-calling device, sounds are generated to simulate the prey of the hunter.

Abstract: The invention provides an assembly of a catheter and a cannula for cooperation therewith, wherein the catheter is provided with visible gradations disposed on the surface of the catheter adjacent its hub. The catheter cooperates with the cannula which is provided with gradations adjacent its distal tip. The arrangement in accordance with this invention allows for the accurate placement of small biological particles such as human embryos to appropriate body cavities.

Abstract: A weighing system including a weighing cell (1) which supplies a measurement signal (I) to an A/D converter (3) via a signal line (2). An interference signal (i), superposed on the measurement signal, is decoupled out of signal line (2) at the signal output of the weighing cell (1), rotated by means of an inverter (4) in terms of phase by 180.degree., and again coupled into the signal line (2) at the signal input of the A/D converter. An ohmic resistance (RO) is connected in series in the signal line (2) between the uncoupling node (AK) and the in-coupling node (EK). The interference signal (i) is decoupled preferably capacitively via a series circuit that forms the frequency-determining member of the active low-pass filter including a condenser (C) and an ohmic resistance (R1). On the other hand, a galvanic coupling (R3) is provided for the recoupling of the interference signal (-i).

Abstract: String supporting apparatus for stringed musical instruments, such as guitars, comprises a plurality of saddles, each having a string supporting V-notch, a plurality of brackets, each configured for tightly holding one of the saddles; and spring means for flexibly mounting the brackets to the instrument so that the saddle V-notches support the strings at either or both the instrument head-end and body-end string break points. Thus, the apparatus may be mounted at either or both the instrument nut and bridge. Each bracket includes a clamp for fixing the string supported by the associated saddle V-notch adjacent to the support point. The spring mounting of the brackets enable tuning of the instrument without unclamping the strings, for example, by tensioning the strings by the machine heads when the apparatus is installed at the nut and by pitch tensioning screws when the apparatus is installed on the bridge.