Abstract: An indicator arrangement comprising an indicator lamp on each side of a vehicle and selectively connectable to a power supply via a selector switch and a control circuit, the control circuit including a pulse generator capable of supplying pulses to the lamp(s) selected and a timer operative to de-activate the pulse generator after a pre-determined time.

Abstract: A deviation indicator interface for simultaneously providing an indication of the deviation of the process value from the set point for each loop of a multi-loop controller is disclosed. The deviation indicator interface includes a plurality of deviation indicators, each deviation indicator providing an indication of the loop deviation of a single loop. Each deviation indicator includes a first, second and third indicator portion. The first indicator portion produces a visible signal whenever the loop process value exceeds the loop set point by at least a first amount, the first amount being adjustable. The second indicator portion produces a visible signal whenever the loop process value is less than the loop set point by at least a second amount, the second amount being adjustable.

Abstract: An alarm circuit indicating a defect in a car alternator, said circuit comprising a voltage divider formed by two resistors connected between the positive terminal B+ and a negative terminal D- of the alternator, the center point of the voltage divider being connected to the control electrode of a commutation circuit of which the output path is serially connected with a lamp between the terminals of the battery, and rectifier means being provided for preventing the battery to discharge through the voltage divider.

Abstract: In a danger alarm system, such as a fire alarm system, the availability of the system is increased by decentralization of the system intelligence. For this purpose, the entire system is subdivided into small system modules which are fully functional in and of themselves. Each system module has connection installations for one or more alarm circuits or one or more subordinate system modules, a programmed control for interrogation and evaluation of alarm signals, as well as connections for display operation and registration elements. One of the system modules serves as the central station, as the remaining system modules are subordinate to the central station in one or more hierarchical levels.

Abstract: A triggered before disarmed alarm system uses CMOS circuitry having a hex-inverter integrated circuit with the output logical inverter coupled to the output transistor by a timing circuit that may be selected through control of the presence and absence of a D.C. operating potential to selectively provide pulsating or continuous potential, respectively, to the output transistor that renders the output transistor intermittently and continuously conductive, respectively, in the presence of an alarm signal. Intercoupling circuitry includes resistance capacitance networks with the capacitance shunted by Zener diodes having a voltage rating corresponding substantially to the voltage rating of the capacitance shunted.

Abstract: An alarm system which is actuated by the unfastening of a snap used on the covering for an automobile or boat. A push-button switch and switch connections make electrical contact when the snap sections are disengaged. Any unauthorized snap disengagements will set off an alarm.

Abstract: A microwave leakage detector which can be attached onto a microwave oven, or similar device, and will detect leakage of microwave signal of a predetermined frequency. The leakage detector can be removed from the oven and periodically utilized as a hand held unit for scanning around the oven door, window, and other parts. An alarm will sound when the microwave signal received is above a preset minimum amount. The preset amount can be varied as desired in order to meet safety standards.

Abstract: Apparatus for and methods of remotely monitoring outputs of Geiger-Mueller tubes including cables for connecting individual Geiger-Mueller tubes to a central monitoring station wherein electronics for sensing the output of each tube is located at the central station rather than juxtaposed with each tube. The electronics are used to trigger individual alarms and a general alarm whenever radiation levels sensed by the Geiger-Mueller tubes pass a predetermined threshold. The apparatus and method are especially useful for monitoring levels of materials in hoppers, or the like, by sensing the impingement of or absence of beams of radiation on Geiger-Mueller tubes.

Abstract: Message character image projection control system, utilizing a matrix array of individually shaped light forming windows and a corresponding array of individual electrically responsive light emitting elements in combination with acousto-optic light reflector means for controlling the optical path relationship between illuminated windows in the matrix and a common optical axis of the system, and additional optics for projecting images of the message character toward a light responsive record medium.

Abstract: An alarm system, particularly for use on a train, responsive to a plurality of different alarm conditions for providing outputs for indicating which one or ones of the alarm conditions have been detected. A signal having at least as many frequency components as there are alarm conditions is generated on a transmission line which runs the length of the area over which the conditions are to be detected. Alarm sensing switches are connected to taps of the transmission line, and each switch is connected to a frequency dependent impedance means which is resonant and has a low impedance at one of the frequencies. A filter is provided for each alarm condition to be detected, each such filter having a band pass at one of said resonant frequencies. The presence of an alarm condition causes an alarm switch to change state, which causes one of the impedance means to short circuit a frequency which otherwise would have been passed by one of the filters, thus indicating the presence of an alarm condition.

Abstract: An apparatus for diagnosing a malfunction of an electronic control system including sensors for electrically sensing conditions of sensing points of a vehicle and an electronic calculation unit for determining an energizing condition of an actuator for controlling a vehicle operation in accordance with output signals from the sensors is disclosed. The malfunction diagnosing apparatus is inserted intermediate of wires which connect the sensors or the actuator and the electronic control system, and when a voltage or current level on any wire assumes a non-steady state, the malfunction diagnosing apparatus determines that a malfunction has occurred at a portion associated with that wire and memorizes and holds the occurrence of the malfunction.

Abstract: A device for detecting and indicating low pressure or excessive heat in a pneumatic tire. A piezoelectric crystal is operatively associated with a temperature expansible member which expands in response to elevated temperatures. The combined dimensions of the piezoelectric crystal and the expansible member are selected so that one surface of the expansible member is a predetermined distance from the inside surface of the tire. Elevated temperatures cause the expansible member to expand and contact the interior surface of the pneumatic tire resulting in the compression of the piezoelectric crystal and the generation of an output signal. Additionally, deflation of the pneumatic tire causes the tire to deflect so that the predetermined spacing between the interior of the tire and the expansible pellet is reduced and the pellet contacts the inside surface of the tire resulting in the generation of an output signal. The output signal is used to actuate a spark gap to warn of an unsafe tire condition.

Abstract: In order to provide for complete testing of all the components of a trigger circuit for actuating an automotive passenger restraint system, and thereby to prevent unintentional deployment of restraint systems, for example air bags, the test circuit performs a testing program which is initiated at the moment when electric power is applied to the passenger safety system. The testing program checks the operation of the electronic discriminator circuits as well as the correct operation of the power output circuit by generating a simulated triggering signal. The actuation of the passenger restraint system is prevented during the test cycle by blocking an auxiliary semiconductor switch connected in series with the power output transistor of the triggering circuit.

Abstract: An electronic system provides traffic control and warning functions by radio transmission of signals to civilian vehicles from authorized mobile units, such as police vehicles and portable units at dangerous locations, such as the scene of an accident or road obstruction, etc., utilizing transmission within a police communications band. Transmitting circuitry carried within the mobile unit includes means for modulating the frequency modulation carrier signal radiated by an antenna with either a voice message or by preselected pulse messages. Receiving circuitry is carried within each of a plurality of civilian vehicles separate from the mobile unit, the antenna of such vehicles picking up the modulated carrier signal when the vehicle is within at least the general vicinity of the transmitting mobile unit.

Abstract: An alarm system including an alarm which is actuated when a sensor such as a microphone detects an emergency condition. In one embodiment the output of the microphone is fed through a filter circuit tuned to frequencies characteristic of breaking glass. In conventional systems failure of the microphone may remain undetected but in the system of the present invention an alarm is instituted when the sensor detects any emergency signals and when the sensor fails to detect a reference signal. The reference signal is produced at regular intervals but the alarm instituting means includes a delay and is operable to switch off the reference signal within the delay period to avoid false alarms.

Abstract: Brake pad backing plates are provided with protrusions at either end and a stationary member straddling the disc is provided with two sets of guide surfaces for supporting the backing plates. When the pads wear excessively, the backing plates shift toward the disc and fall into the lower set of guide surfaces to generate a warning sound either electrically or mechanically.

Abstract: A system for conveying to the driver of a vehicle information concerning the physical state of a tire, such as its inflation pressure, comprising an electrical signaling device mounted on the wheel and arranged to transmit signals to the driver via a circuit including a conduction path through the ground or road surface on which the vehicle is supported.

Abstract: An FSK receiver for a single channel analog telemetry system comprises an FSK demodulator, a frequency multiplier, and a frequency-to-voltage converter. An FSK transmitter comprises a voltage-to-frequency converter, a frequency divider, and an FSK tone generator. The principal advantages of this system are greater speed due to faster settling time and reduced errors in accuracy and linearity.

Abstract: Devices for transmitting signals from a rotatable tire to a stationary receiver which correspond to the internal pressure of the tire. In one embodiment, a Bourdon tube communicates with internal tire pressure to regulate the magnetic gap of an electromagnetic induction configuration. Changes in the magnetic gap result in corresponding changes in an output signal strength. In another embodiment of the invention, a bellows is provided in communication with tire pressure for regulating the position of the core of an LVDT. The core position and, accordingly, the output of the LVDT corresponds to tire pressure. In yet another embodiment, strain gauges or other appropriate electrical signal generators are connected to the tire and interconnected with a rotating race. A plurality of ball bearings are maintained in a preloaded condition between the rotating race and a stationary race, the latter race communicating signals to a tire pressure meter or the like.

Abstract: An appliance theft alarm for mounting on or inside an electrical appliance which, when the electrical plug connecting the appliance with a wall electrical outlet is removed, will sound an audible alarm in order that the theft may be detected.Specifically, electrical apparatus is interconnected so that the electrical power cord running between the electrical appliance and the electrical wall outlet is sensed for the presence of electrical voltage, where when the electrical voltage is present, a relay is energized to inhibit the alarm circuit. When electrical voltage is removed, the relay becomes unenergized and in doing so, completes an electrical circuit for a self-contained battery to power an electrical horn or siren alarm. The battery is provided with a battery charger which is supplied ac current from the electrical line input. Additionally, a key controlled contact is provided to inhibit the alarm circuitry when desired or to interrupt the alarm when sounding.