Abstract: Sequentially generated pulses are applied to respective groups of alarm and status condition responsive contacts. A memory is indexed in accordance with the pulses to store individual condition signals received from respective contacts in each group and activate alarm or status indicators. A lock switch operates facilites for partially disabling a manual acknowledge switch which turns off audible and blinking alarm indicators. A printer records the time and a character indicating the specific alarm contact which was activated. Alarm summary command or alarm status summary command switches may be selectively operated to produce a print out of all alarm conditions or a print out of all alarm conditions and the status of all status contacts. The system employs modular units which may be selectively connected in the system to provide lamp annunciator functions and/or printing functions for selective sized groups of contacts.

Abstract: A positional transducer is disclosed which utilizes an elongated, hollow, cylindrical tube of a magnetically saturable material, a sense wire that runs through the tube parallel to its elongated axis and a pair of elongated, generally rectangular shaped magnets of opposite polarity which have a length that is no greater than the length of the tube and which are closely positioned adjacent diametrically opposite exterior portions of the tube. As the magnets move over in the tube, they provide substantially complete saturation of the tube in the portion over which they extend while the remaining portion of the tube remains unsaturated thereby giving a linear indication of the position of the magnets with respect to the tube.

Abstract: Disclosed is a unique probe and amplifier circuit for use with a digital height gauge or other measuring device. Fundamentally, the invention utilizes a probe tip operatively connected to the primary and secondary windings of an LVDT; the core of the LVDT being fixedly positioned between the windings. Deflection of the probe in either direction along the axis of the core results in an output signal from the LVDT, the amplitude of the signal being indicative of the magnitude of the deflection. The signal is translated into a varying DC level, the value of the DC level being linearly related to the deflection of the probe. The DC voltage is applied to an operational amplifier having selective feedback networks associated therewith which prescribe the gain of the amplifier and hence its subsequent effect upon a calibrated meter connected to the output thereof. The meter provides visual readings indicative of the deflection of the probe.

Abstract: A data collecting system is provided to produce a record of data relating to sequential occurrences for subsequent and/or remote processing. The system includes clock means for generating a time or service representative signal, at least one means adapted to generate a signal in response to an external random input, and scanning means adapted to sequentially scan the generating means and interconnect the generating means and clock with a recording medium if a random input signal is detected.

Abstract: An alarm circuit includes an alarm condition indicating section having an alarm indicator, such as a lamp, and a power supply therefor, the lamp becoming illuminated in response to sensing of an alarm condition. Also included is an alarm condition sensing element, such as a normally open switch or a photoconductor normally incident with a low level of light, which under normal conditions, i.e., in the absence of an alarm condition, exhibits a very high impedance, but which in response to an alarm condition exhibits a low impedance. The alarm condition sensing element is connected to the alarm condition indicator and in response to the sensing of an alarm condition and being placed in its low impedance condition causes the alarm indicator to provide an alarm indication.

Abstract: A small self-contained sensor and transmitter assembly including a sensor for detecting physiological and bio-medical phenomena and a transmitter for transferring such data to a receiver for display and other use is disclosed. In one embodiment, the sensor is adapted to be secured within the axilla of a patient to detect his temperature by means of a thermistor arranged in heat exchange relation with the body of the patient. The thermistor modulates the pulsing rate of a blocking oscillator which generates a magnetic field, the pulsing rate being proportional to the physiological phenomenon of interest. The oscillator, power supply, antenna, and other circuit elements are mounted within corresponding compartments in a molded plastic housing, the arrangement being such that substantially all of the interconnections between circuit elements are made using only the component lead wires.

Abstract: A pneumatic road tube, a pressure responsive transducer, and an electronic circuit provide a vehicle sensor mechanism for use in a traffic data accumulating system. A complex air wave is produced within the tube each time a vehicle axle runs over the tube, these waves are sensed by the transducer which responds by producing an electric output signal indicative thereof. The transducer output signals are coupled to the electronic circuit which amplifies weak signals and blanks out unwanted portions thereof to produce signals suitable for application to the data accumulating device. The electronic circuit may be present by an operator to accurately respond to the various types of transducer output signals produced by slow, medium, or high speed traffic.

Abstract: Each person underground in the mine carries in his helmet lamp a continuously operating transmitter the signal of which is detected by a receiver. The receiver or the antenna thereof is installed, in one embodiment, in a Faraday cage that surrounds the dangerous area, such as the feed side of the crushing machine or the delivery end of a conveyor. In another embodiment, directional antennas are located at the approaches to a blasting area, for example. In either case, when a signal is detected indicating the presence of a person in the danger zone, in the case of the Faraday cage, or near the danger zone, the conveyor is stopped or a warning is sounded, as the case may be.

Abstract: A distribution network power line communication system including a central communication terminal at a distribution substation in signal communication with a plurality of remote communication terminals via the electrical distribution power lines. The central communication terminal uniquely addresses a selected remote communication terminal with an interrogation signal which requests the performance of a selected distribution automation function. The selected remote communication terminal performs the requested function and sends a response signal back to the central communication terminal. Signal amplifying repeaters are disposed in signal communication with the electrical distribution power lines, which ensure that the interrogation and response signals are at usable signal levels when they reach their intended destinations.

Abstract: Apparatus responsive to immersion in water to complete an electrical circuit through which a signalling means is energized from an electrical energy source includes a sensor which is salt or fresh water actuated depending on the sensitivity of the circuitry utilized in conjunction with the sensor. The sensor comprises an outer peripheral shield, such as an outer conductor, and an inner conductor, or pair of inner conductors, wherein air holes or slots are provided in the outer shield so as to enable the venting of air from within the interior of the outer shield at substantially any depth of immersion of the sensor in water less than total immersion while preventing the inadvertent entry of splash water prior to such immersion. In this manner water may enter within the outer shield interior to contact the conductor elements and complete the electrical circuit at immersion depths where the water pressure is normally insufficient to cause such entry without venting of the air.

Abstract: A distribution powerline carrier communication system for providing distribution automation functions. The communication system includes a distribution powerline, with inductive couplers and frequency translating repeaters cooperating to circumvent signal obstructions, such as distribution transformers, and to increase the signal strength. The inductive couplers pick up the communication signals without metallic contact to the primary distribution lines, and the repeaters change the frequency band of the communication signals, enabling the amplifier gain of the repeaters to be selected without limitation due to undesirable feedback and oscillation.

Abstract: An ultrasonic alarm system comprising a transmitter having an oscillator which produces an ultrasonic carrier frequency signal. An audio signal generator produces a signal which modulates the carrier signal. The modulated signal is applied to a crystal through a tuned circuit. The transmitter is energized by operating a pushbutton which remains latched in operative position and which is unlatched only by the use of special devices. A plurality of receivers are provided and individual receivers are positioned at different locations throughout the premises to be protected. Each receiver includes a demodulator that demodulates the received signal and applies the same to a phase locked loop type phase detector which actuates an alarm when the demodulated signal is present. The alarm indicates the particular receiver that has been activated so that help may be dispatched immediately to the correct location.

Abstract: A system for varying the function of a keyboard using a plurality of status keys to select a function. The status keys form a binary which are decoded in a first word decoder forming a single word which are fed to a plurality of binary decoders one each associated with one of the information keys on the keyboard for controlling the readout thereof. The information keys are also switches that activate a word encoder for producing a final output. A comparator gate can be interposed between the word encoder and the selection switches of the information keys, the gate being enabled by the first word decoder. The decoded word originating from the status keys also feed a segment decoder which activates segments surrounding selected information key elements.

Abstract: A transducer sytem comprising a plurality of patient mounted transmitters, each of the transmitters including means for generating an asymmetric wave or a variable periodic pulse train, the asymmetry or variable periodicity of said pulse train being proportional to the quantity being transduced, each of said transmitters including an output electrode. A receiver is also provided including portable hand held input electrode electrostatically coupled to one of the transmitter electrodes, the receiver including means for converting the variable periodicity or asymmetry to a magnitude representative of the transduced quantity in proportion to the variable periodicity or asymmetry.

Abstract: A heating plant monitor system for visually signalling the presence and location of a malfunction or abnormal condition is disclosed. The system is particularly adapted for use with residential or mobile home heating systems and includes a visual display panel with indicator lights with each indicator light corresponding to a particular system condition or component to be monitored. The arrangement of the light sequence on the panel corresponds to the order in which each component should be checked by a serviceman so that the condition of the entire panel, when one or more malfunctions occurs, will indicate which component should first be checked for malfunction and which other components need not be inspected. Other household components, spaces or services can also be monitored for the presence of an operating abnormality or for water, smoke, etc., by adding monitors and indicator lights to the basic heating plant system.

Abstract: An illuminated fishing tackle box which includes an opened topped base portion of generally right parallelepiped configuration, a lid hingedly connected to one side of the base portion and forming a closure for the open top of the base portion, and a light swivelly mounted on one end of the base portion on the outside thereof for selectively directing a light beam in a direction extending toward the bottom side of, or alternately, directly out from, the base portion. A second light of different color from the first-mentioned light is mounted on the opposite end of the base portion from the first-mentioned light, electrical circuitry interconnects the two lights and includes means for causing the second mentioned light to undergo an intermittent on-off status so as to present a flashing light.

Abstract: Circuits and structures are arranged to serve as encoders, emitters, or switches by capacitive coupling.

Abstract: A digital start-stop multiplexing system including a sender which sequentially scans a plurality of monitoring points and generates a train of digital pulses coded to represent information provided at the monitoring points for transmission over a transmission line to a receiver which is responsive to the digital pulses to automatically synchronize itself with the sender, store the data pulses and provide indications of conditions indicated at the monitoring points. The receiver also monitors the transmission line and detects and displays open or short circuit conditions of the transmission line. Coded pulses may also be transmitted from the receiver location to the remote sender over the same transmission line during stop portions of the primary signal.

Abstract: A power line data transmission system is disclosed in which data is transmitted over a line carrying alternating current power by varying or modulating the power factor of the line or the phase angle of the power on the line in accordance with a signal to be transmitted. A series connected reactance and switch are connected across the line. The switch is turned on and off in response to the data signal to be transmitted over the line. The phase angle of the voltage and current on the line is detected at the receiving location. The phase relation between the voltage and the current is detected or compared to produce a binary digital signal corresponding to the data sent over the line. The detection of the voltage and current being out of phase by a predetermined amount may be used to generate a signal indicating a digital one. The detection of the voltage and current being in phase may be used to generate a signal corresponding to a digital zero.

Abstract: An alarm sensor device of two major portions. The first portion is a securely enclosed chamber containing one or more connector elements and the second portion is a specific length of cable having conductor paths for energy transmission and having at least one connector device attached to at least one free end of the cable with the connector being compatible with the connector element installed within the enclosed chamber. Separate and additional means for interconnection of the conductors within the chamber to conductors of energy originating from alarm system equipment at a remote location is also provided. The specific length of cable securely emanates from and thereafter terminates by connector means within the enclosed chamber thereby forming a closed loop of fixed and unalterable circumference thereby providing a loop to protectively encircle an object.