Abstract: An improved injection molding system having gas injected through an injection pin associated with an ejector pin. The injection pin is movable between a retracted position at which it is sealed from the mold cavity, to an extended position where it delivers gas into the cavity. In a first embodiment, the injection pin is powered by a cylinder to move between the extended and retracted positions. In a second embodiment, the injection pin is actuated by the pressurized gas. The improved system injects gas into a mold cavity without the requirement of a separate injection aperture. Further, the inventive injection pins have outlet ports sealed from the flow of plastic until the injection pin is extended to deliver the gas.

Abstract: An improved nozzle for gas-assisted injection molding and a method of gas-assisted injection molding using the improved nozzle are provided. This improved nozzle employs a very simple design to vent the gas from the mold cavity once the plastic article has cooled sufficiently to be self supporting. In one especially preferred embodiment of this invention, the improved nozzle contains a separate plastic shut-off valve, a separate gas inlet passage with a check valve, and a separate gas venting passage containing a movable pin. Venting of the pressurized gas occurs by movement of the movable pin so that the pressurized gas can burst through the thin layer of plastic material covering the gas venting passage. The improved nozzle design and method allow for almost continuous operation with minimal operator attention to the nozzle.

Abstract: A method and associated apparatus for gas assisted injection molding wherein a quantity of fluid molding material is injected through a first injection flow path in a gas assisted injection molding nozzle into a mold cavity. The injection is then stopped by interrupting the flow of fluid through the first mold cavity, and introducing a time delay if desired. After any time delay, a quantity of pressurized gas or fluid at a first desired pressure is injected into the mold cavity through a second injection flow path which is isolated from the first injection flow path. The pressure is then reduced to a desired holding pressure, and the pressure is held in the mold while the part cools enough to be self supporting, at which time the pressure is vented from the mold cavity, and the part removed. The apparatus used, by isolating the molding material from the gas passages, is able to be of a simpler construction, avoid clogging of the passages, and use larger gas passages, all without the use of any check valves.

Abstract: A check valve is provided that is especially useful in gas-assisted injection molding wherein pressurized gas is injected into molten plastic material. A tapered or cone-shaped valve member which seats into a correspondingly tapered or cone-shaped valve chamber provides the mechanism by which the valve seals against reverse flow. Any plastic material entering the gas passageway would contact the base end of the tapered or cone-shaped valve member and not any sealing surfaces. By minimizing contact with the sealing surfaces, the useful lifetime of the check valve is significantly increased.

Abstract: The present invention is directed to a multisize coaxial cable testing device having a housing, a transmitter-analyzer unit and a receiver unit. The transmitter-analyzer unit is located in the housing and includes an on/off switch, a power source, wiring, a circuit board with resistors to regulate current flow, and three or more different size three-wire coaxial cable connectors. The transmitter-analyzer unit also includes at least two signal lights and the power source is connected to each of the cable connectors through the circuit board and wiring. The signal lights are also connected to the wiring to signal the malfunction of a particular wire of a three-wire coaxial cable when tested. The receiver unit receives current from the transmitter-analyzer unit and returns current to the transmitter-analyzer unit. The receiver unit has three or more different size three-wire coaxial cable connectors of the size and type as the connectors of the transmitter-analyzer unit.

Abstract: A construction kit consisting of telescoping strut members and pre-measured elastic or inelastic tendons, for the purpose of constructing tensile-integrity structures. The invention is made of reusable elements. By introducing struts which can be adjusted to various lengths the invention circumvents the necessity of measuring, cutting and tying different lengths of tendons for different structures and considerably simplifies the construction process.

Abstract: In a method of continuously casting unrefined electrodes in quantity for use in the electrolytic refining of metal in which a metal e.g. copper, strip is continuously cast and cut at spaced positions along its length to form electrodes, a substantial saving in metal is effected by casting the strip in such a way that, in longitudinally spaced minor portions of its length, the strip has at least one hole, recess in at least one of its side edges, or region of substantially reduced thickness as compared with that of the major portion of its length.

Abstract: A construction kit consisting of rigid or telescoping elongate strut members which may be attached together by flexible tendons to form a variety of designs and model structures. The invention places no limits on the number of struts which can be attached at one vertex or their relative angles, and the length of each strut may be varied within broad limits. Furthermore, the end of one strut may be attached not only to the end of another, but to any point along its length. Accordingly, an almost unlimited variety of constructions is possible.

Abstract: A method of operating a Doppler radar to track a target when main beam clutter is present is shown to comprise the steps of: (a) forming, from all signals exceeding a predetermined amplitude that are received by the pulse Doppler radar during a predetermined period, a range/Doppler matrix having NXM cells, where N is the number of range bins and M is the number of Doppler bins, with a digital one in any cell representative of a return signal with a given Doppler shift frequency from a reflector at a given range; (b) sequentially reading, in accordance with a predetermined program, the contents of the cells in the range/Doppler matrix to form digital numbers with digits indicative of the presence or absence of a reflector in adjacent cells; (c) comparing each digital number to a digital number representative of a target return signal; and (d) generating a frequency control signal when the comparison step indicates a target return signal to adjust a local oscillator in the pulse Doppler radar to effect tracking

Abstract: In a method of continuously casting unrefined electrodes in quantity for use in the electrolytic refining of metal in which a metal e.g. copper, strip is continuously cast and cut at spaced positions along its length to form electrodes, a substantial saving in metal is effected by casting the strip in such a way that, in longitudinally spaced minor portions of its length, the strip has at least one hole, recess in at least one of its side edges, or region of substantially reduced thickness as compared with that of the major portion of its length.

Abstract: A process is disclosed for removing impurities such as carbon dioxide, and sulfur dioxide from acidic fluid solutions using a serpentine material and producing a reaction product comprising recoverable metal values and finely divided silica. In accordance with the process, the serpentine material is slurried with water and is then mixed with an acidic fluid solution including at least one of H.sub.2 CO.sub.3 and H.sub.2 SO.sub.3. In particular, the acid material may be formed by contacting a gaseous component such as carbon dioxide or sulfur dioxide directly with water. A waste industrial gas containing carbon dioxide, sulfur dioxide, or a mixture of the two is an excellent source of gaseous components having utility in connection with this invention.

Abstract: Daily engine checks or health tests are being developed for determining the ondition of an engine by relating significant performance parameters. One such health test, termed "HIT," utilizes exhaust gas temperature along with compressor speed. Since results of this test vary with outside air temperature conversions must be made by maintenance personnel and pilots. A calculating device is provided for this use.

Abstract: Metal, e.g., copper, is electrolytically refined by a series process in which the intermediate electrodes are removed from the tank of electrolyte solution before all the impure metal has been dissolved from them, and each partially refined intermediate electrode so formed is passed in turn through apparatus which mechanically separates the pure and impure metal of the electrode. Preferably the electrode-separating apparatus distorts the pure and impure metal of the electrode to such an extent that they are separated. The separated pure and impure metals of each electrode are preferably conveyed from the electrode-separating apparatus along separate predetermined paths. All these operations are preferably effected automatically.