Abstract: A safety closure lock apparatus for preventing unintended ejection of submunitions from a munitions canister tube comprising a bridle assembly adapted to be applied over the muzzle end of the canister tube at a point of time following the loading of the submunitions.

Abstract: A metallic projectile body with a plastic rotating band comprising a band seat zone on such projectile body coated with a sprayed metallic coating, and a polymer molded over said sprayed metallic coating to form a plastic rotating band.

Abstract: A method of manufacturing a spin stabilized discarding sabot projectile comprising the steps of preassembling a subcalibre cylindrical projectile in a full calibre cylindrical pusher, installing the subassembly in a two section injection molding machine with spring biased pusher locator and spring biased projectile nose locator for precisely holding the subassembly aligned with a primary axis, following which plastic material is injection molded about the projectile. Surplus plastic material may be removed as by machining and a noise piece may be added.

Abstract: An outdoor coil defrost control system for a reverse cycle refrigeration system comprising outdoor air temperature sensing means, means for producing an output signal indicative of the operation of the refrigeration compression means, and a special controller means having operative connections to the temperature sensing means and compression sensing means and comprising in part (a) a special variable frequency oscillator having an input indicative of the outdoor air temperature and an output signal the frequency of which varies as a non-linear function of the magnitude of the outdoor air temperature, (b) a counter means having an input connected to receive the output signal of the variable frequency oscillator, and (c) means for placing said refrigeration system into an outdoor coil defrost mode of operation upon the counter means counting a preselected number of counts or pulses.

Abstract: Incandescent lamp driver circuit with current surge limiting and built-in test features.

Abstract: A millimeter-wave stripline planar mixer to provide a means for mixing a local oscillator signal with a radio frequency signal to produce an intermediate frequency signal, the mixer utilizing beam lead schottky-barrier diodes in a balanced configuration.

Abstract: A defrost control system for a reverse cycle refrigeration system wherein the outdoor coil is defrosted as a function of the operation of a demand type control for initiating the defrost mode of operation. The control system further includes a means for monitoring the frequency of defrost cycles. If too frequent defrosting is detected then the demand system is overriden and subsequent defrosting occurs only after the heat pump has been operating in the normal heating mode of operation for a predetermined length of time.

Abstract: A millimeter-wave odd-harmonic frequency multiplier comprising a block member having an RF output port and an RF input port at right angles to one another with a pair of nonlinear resistance type diodes positioned at the intersection of the RF input port and the RF output port.

Abstract: A method of bonding a thermoplastic rotating band onto a projectile including the steps of designating, e.g., machining, a band seat zone onto a metallic, e.g., steel, projectile body, coating the band seat zone with a sprayed metallic coating, and applying a polymer in liquid form around said zone and to said sprayed metallic coating to form a plastic rotating band.

Abstract: An apparatus for interpreting digital output signals from a Code 39 bar code data system wherein all of the bars and spaces in a signal code character are measured for time duration, minimum and maximum widths bars and spaces are identified, first bar cutoff and space cutoff values are respectively produced having a time duration approximately 1.5 times the time duration of the minimum width bar and space, second bar cutoff and space cutoff values are respectively produced having a time duration approximately equal to one-half of the sum of the time duration of the minimum and maximum width bars and spaces and means are provided for respectively comparing the first and second bar cutoff values and space cutoff values and for using the greater of such values as a reference against which all of the bars and spaces in said characters are respectively measured.

Abstract: A defrost control system for a reverse cycle refrigeration system wherein the outdoor coil is defrosted when outdoor coil temperature is equal to or less than the product of a preselected constant N.sub.1 and the outdoor air temperature and controller means are provided to calculate a new value of N.sub.1 after each defrost operation, the calculation being based on stabilized values of outdoor air temperature and outdoor coil temperature for clear coil conditions.

Abstract: Safety apparatus connectible between a human and an electrically conductive terminal includes an electrical part connectible to the terminal, a first electrical cable having one end adapted for electrical connection to the human, and an electromechanical device interconnecting the opposite end of the cable and the electrical part, such electromechanical device including releasably interconnected plug and socket elements and an elongated flexible connection located between the elements and part, the elements being releasable in response to tension exertion transmitted between the cable and the flexible connection.

Abstract: A stress sensitive semiconductor unit comprising means for supporting a very long elongated cylindrical support member having a stress sensitive semiconductor die bonded to one end thereof, a plurality of metal elongated terminal pins held in rigid hermetically sealed insulative relationship with said header, first and second insulative spacers having central bores sized larger than the outer diameter of the glass tubular member and positioned in axial proximity to one another with the first spacer being abutted against the header and with the second spacer being sized so that the outer axial end thereof is substantially in planer register with the active face of the semiconductor die, the ends of the terminal pins being mechanically and electrically connected to conductive areas or portions on the face of the second spacer.

Abstract: An apparatus for determining the time of the closest point of approach of a taxiing aircraft comprising a microphone means for producing an input signal in response to the sound energy of a taxiing jet. A low pass filter is provided to receive the input signal and pass low signals having a frequency less than or equal to 1 KHZ while a high pass filter is provided to receive the input signal and pass high signals having a frequency greater than or equal to 1.5 KHZ. Demodulators are provided for receiving the signals from both the high and low pass filters, and are adapted to produce a low frequency envelope from the low signal and a high frequency envelope from the high signal. Finally, comparator apparatus is provided for receiving the low frequency envelope and the high frequency envelope and comparing the amplitudes so as to provide a signal at the point in time when the amplitude of the low frequency envelope exceeds the amplitude of the high frequency envelope.

Abstract: A control system for a refrigeration system for controlling the defrosting of one of the heat exchange coils thereof; the control system comprising a nozzle element positioned adjacent to one side of the evaporator coil at a point where frost may build up on the evaporator coil; compressed air means connected to the nozzle through valve means and controllable to selectively permit air to be discharged from a nozzle against the coil; air flow sensor means positioned on the other side of the evaporator coil in register with a nozzle, the sensor means including switch means adapted to be actuated upon said sensor being impacted by a stream of air; and controller means adapted to periodically actuate the valve means so as to cause periodic pulses of air to flow from the nozzle through the evaporator coil, said controller further functioning to place the system into a defrost mode of operation upon said sensor switch means being unactuated for a period of time exceeding the cycle period of the actuation of the val

Abstract: Apparatus for classifying the activity of an aircraft including the geophone proximate an airfield used by jet airplanes for generating a signal indicative of the existence of the jet aircraft. Amplifier means are provided for enhancing the signal. The signal is then passed through a low pass filter means for receiving the signal and passing only that portion having a frequency less than about 30 Hz. A high band pass filter also receives the signal and passes only that portion having a frequency ranging from about 90 Hz to about 120 Hz. Two demodulator means are provided which receive the low pass signal to provide a low pass envelope and receive the high band pass signal to produce a high band pass envelope. Threshold signal generating means are provided to receive the low pass envelope and the high band pass envelope, and generate a signal when either or both envelopes reach a predetermined threshold.

Abstract: An evaporator coil defrost control system for a refrigeration system comprising refrigerant compression means, a condenser coil, an evaporator coil, and an electric motor operated fan positioned adjacent to said evaporator coil and adapted, when energized, to blow air through said evaporator coil, said defrost control system comprising: strain sensing means connected to said fan blades and adapted to measure force applied to said fan and to produce a signal indicative of said measured force; controller means connected to said strain sensing means to receive the signal therefrom and having operative connections to said system, said controller being adapted to place said system in a defrost mode of operation upon said signal of said strain sensing means having a characteristic indicative of a significant frost build-up on said evaporator coil.

Abstract: A control system for a reverse cycle refrigeration system for controlling the defrosting of the outdoor coil thereof on a cost effective basis; the control system comprising a controller means receiving inputs indicative of the temperature of the outdoor coil, and the operation of the compressor means; the controller means having a timing function which is initiated upon the outdoor coil temperature being at or below a preselected value and the compressor means being operated; the duration of the timing function being determined on a substantially continuous basis as a function of the magnitude of the outdoor coil temperature; and the controller means having an operative connection to the system so as to, upon completion of the timing function, place the reverse cycle refrigeration system into an outdoor coil defrost mode of operation.

Abstract: A compressor fault detection and control system for a reverse cycle refrigeration system for detecting faulty compressor operation and for controlling the system in response to the detection of a fault by inhibiting the compressor and for providing a fault indication, the control system comprising a controller means receiving inputs indicative of the outdoor coil temperature, the temperature of the compressor discharge refrigerant, and an output indicative of a demand from an enclosed space temperature sensing means for heating or cooling of the enclosed space. The controller means also includes timing means and means for comparing the value of the compressor discharge temperature and the value of the outdoor coil temperature.