Abstract: A device for indicating insufficient inflation pressure in vehicle tires and of the type comprising an emitter coil (6,7,8,9) and a receiver coil (16,17,18,19) housed on a fixed support of said vehicle so that they can coupled only by a first and second transfer coil (not illustrated) disposed in any wheel and connected in series with an electric contact operated by a transducer when the value of the pressure in said tire exceeds a minimum set value is described.The main feature of said device is that it comprises memory means (47,75) and control means (57,58) connected with an output of memory means; and alarm means (76,77) connected with an output of said memory means; said control means being arranged to automatically activate said memory means so that they receive the signal received periodically by the receiver coil, only when said signal has a frequency exceeding a minimum set value.

Abstract: Variable rate digital control of a frequency synthesizer is afforded by periodically generating a digital signal from among a plurality of such digital signals representative of various tuning rates, converting each digital signal to a digital control word through a rate decoding means in which each control word is associated with at least one of the digital signals, applying the control words to a digital counting means having a plurality of counting rates, with each rate being determined by a different one of the control words, and applying the digital count of the digital counting means to the frequency synthesizer to control its frequency.

Abstract: A photocell is placed beneath a packet of real or simulated currency at each of a plurality of teller locations in a bank. The photocells at the several teller locations are connected in a parallel circuit with each other, and a voltage supply source is connected to the parallel circuit through a common current-sensing resistance, so that if currency is removed from any teller location this will be indicated by a voltage drop across the common current-sensing resistance. The common current-sensing resistance is located in a control box at a remote location within the bank, and used to control even more remote alarm equipment, at a police station for example.

Abstract: A vehicle is fitted with a passive seat belt system which includes a seat belt, an emergency release tongue connected to the seat belt, and a slider which slides to and fro along a guide rail fixed to the vehicle body. An emergency release buckle is coupled to the slider, and is adapted to lock on the emergency release tongue when the emergency release tongue is inserted into it. A slider tongue is connected to the slider, and an anchor buckle is connected to the vehicle body in a position to, and adapted to, lock on the slider tongue, when the slider is in a position along the guide rail to tighten the seat belt about a person seated in the seat to insert the slider tongue into said anchor buckle.

Abstract: Theft prevention apparatus for vehicles which includes a movement detector provided with a pointer and generating an electric potential when the pointer is moved, a transmitter connected to the movement detector and a receiver provided with a loudspeaker for being adapted to produce an alarm sound. The movement detector and the transmitter are mounted on a vehicle, and the receiver is detachably connected to the transmitter. When the receiver is detached from the connection with the transmitter, the transmitter transmits alarm signal to the receiver in response to the predetermined amount of electric potential generated by movements of the pointer of the detector which is adapted to detect movements of the vehicle. When the receiver is connected to the transmitter, the pointer of the detector is locked against its movements, whereby proper and reliable operation of the detector can be assured.

Abstract: The invention provides an electronic circuit, preferably in CMOS, for a keyboard switch matrix with only two pole switches and no interconnecting diodes. The column and row wires are each connected to ground via a resistor and to the supply voltage via an electronic switch and an inverter. The output of the row inverters are connected to a NAND gate which controls the electronic switches.

Abstract: An alarm device which includes a housing, batteries in the housing, conductors and a light source and an audio signal in parallel to one another and connected to the batteries and switch means between the light source and the audio signal, in series therewith, and normally opened, yet adapted to be closed by movement of the switch to cause, optionally, a light or an audio signal and, alternatively, an attachment for the housing to provide an alternative circuit with a switch in it which is activated by heat, or by closing to a normal position upon release under predetermined conditions to override the signal and to cause an audio signal to warn a person that an intruder has entered a room or that the heat within a given location exceeds a certain predetermined amount.

Abstract: Device for resetting a direction-of-travel indicator for automobiles after completing a curve providing in association with the turnable steering-column/steering-wheel unit and in fixed position thereto switch elements, particularly opto-electrical transmitters and receivers coverable by a mask turnable with the steering-column/steering-wheel unit which when the steering wheel is turned back after going around a curve disconnects the directional indicator which has been actuated by a push switch and a scanning of the direction of rotation takes place. The device is characterized by a digital evaluation electronic system which satisfies a series of sequential conditions.

Abstract: A bed mat having a sensor for detecting abnormally high temperatures and for detecting when the occupant of the bed is not in it is connected to a control console which has circuits for producing a first electrical signal having a first characteristic in response to the detection of an abnormally high bed temperature and a second signal having a second characteristic in response to the detection of the absence of the bed occupant. In one form of the invention, these signals are applied to the conventional nurse call system to produce sensory signals at the nurses' station, for example, indicative of the detection of high temperature or absence in a way such that they can each be distinguished from the signal produced at the nurse's station by the use of the nurse call button by the patient. Provision is also made for coupling of a smoke detector into the system for actuating the high temperature alarm signaller if smoke is detected.

Abstract: A device to detect and signal the moment when a beast prepares to give birth. A container having fastening means for attachment on the behind of the beast is connected at its upper part to a tube extending so that its free end can be introduced into the vagina of the beast beyond the urethra. In the lower part of the container there emerges a tube of small diameter which is connected to a pressure sensor connected in the electrical circuit of an alarm device for producing an actuating signal for said alarm device in response to an increase of pressure in the container. In this way, an alarm is given as soon as from the breaking of the allantoic and amniotic sacs of the beast. The device further is arranged to monitor the subsequent development of the dropping.

Abstract: A warning circuit generates warning signals in response to conditions of a vehicle brake system which includes main and back-up brake fluid pumps. The main pump is engine-driven and ignition-switch controlled. The back-up pump is relay actuated and battery powered. A sensor switch opens upon operation of the main pump and a brake switch closes during an operator brake application. The warning circuit includes a first OR gate with inputs coupled to the ignition and brake switches. The output of the first OR gate is coupled to the relay and to a first warning lamp. The output of the first OR gate is capacitively coupled to the set input of a set-reset flip-flop and is coupled to the reset input of the flip-flop. The reset input is also coupled to a terminal of the back-up source. The Q output of the flip-flop is coupled to an input of a second OR gate through an inverter.

Abstract: A personal alarm device which provides for both intermittent actuation of a personal alarm as well as irreversible actuation of such alarm by the provision of multiple actuation modes including a positive displacement device which is lever and spring controlled to move a pin within the device out of restraining engagement with an alarm actuator mechanism in a manner which will prevent deactivation of the alarm by return of the pin to its previous position.

Abstract: A system for producing an alarm whenever the distance between a transmitter and a receiver exceeds a predetermined distance. The transmitter includes circuitry for generating a signal having a preselected pulse code modulation pattern. The receiver includes circuitry for responding to the particular pulse code pattern and for sounding an alarm when the signal from the transmitter is so weak that pattern is not received.

Abstract: In the event that a taxicab driver is threatened with robbery, he depresses a silent floor switch in his taxicab which initiates two different alarm or alerting mechanisms, neither of which are visible to the robber who is normally sitting in the back seat of the taxicab. First, a special warning light appears on the roof of the cab; and second, a coded signal is sent back to the dispatcher's office to both identify the serial number of the cab in which the robbery is threatened, and also to provide a continuous coded signal which may be employed to direct police or private detectives to the location of the robbery.

Abstract: In an arrester comprising a characteristic element made up of a stack of a plurality of metal oxide resistors, parallelly connected capacitor and a linear resistor are connected between the characteristic element and ground, and voltage drop across the linear resistor is used to light a neon lamp or to operate an alarm device for detecting deterioration of the characteristic element. To protect the capacitor and the linear resistor at the time when the arrester operates, a nonlinear resistor may be connected in parallel with the capacitor and the linear resistor.

Abstract: An alarm which is actuated when the driver of a vehicle falls asleep or dozes includes spaced conductors affixed to the steering wheel of the vehicle. When the driver is awake, both of the conductors are firmly contacted by one of the driver's hands and a minute current flows between the conductors through the driver's hand. This current maintains a switch in one state in which an alarm is deactuated. Should the driver fall asleep while driving, his hands will lose their grip on the steering wheel and thereby open the conducting path between the conductors. When this occurs, the switch is placed in a second condition in which the alarm becomes actuated to awaken the driver. The alarm may either be mounted to the steering wheel itself or on a cover attached to the wheel.

Abstract: A device is provided for controlling the electro-mechanical locking and unlocking member of a vehicle door lock and comprises a transmitter independent of the said vehicle and a receiver mounted inside the vehicle. The transmitter comprises a direct current electric supply source, a coded pulse signal generator drivable by said supply source, and an infra-red radiation emitter connected to said coded signal generator whereby said radiation emitter outputs infra-red pulses in coded form. The receiver comprises detector means for the reception of the infra-red pulses, a memory programed to emit coded pulses identical to said coded pulses from the emitter. A comparator coupled to the outputs of said detector means and said memory, and arranged to emit a signal in the case of agreement between the transmitter and receiver pulses, and an amplifier connected to the output of said comparator.

Abstract: The invention consists of applying a signalling condition to a telephone subscriber line to prime a common burglar alarm arrangement provided at the telephone exchange, which arrangement is activated by the removal of the signalling condition from the line by, for example, a burglary detection device. The equipment at the telephone exchange automatically identifies the subscriber line when the signalling condition is removed and activates an event recording alarm equipment in a Police or Security central station, giving a print out of the identity of the subscriber whose premises have been entered. The major advantage of the system is that the cutting of the telephone line causes the tripping of the common alarm equipment.

Abstract: A detector and indicator for burglar alarms is provided wherein passive resonators, each tuned to a different frequency, are employed across each of the normally closed series switches of the burglar alarm. An alternating current generator is connected to the series line and tuned progressively to the frequency of each of the passive resonators. If an open circuit occurs across any of the resonators, a detector circuit detects the high impedance which results and actuates an indicator circuit wherein the indicator is selected for the frequency of the resonator of a particular location. Even if a plurality of switches are open, the selection circuit will be activated for the particular locations of the open switches.

Abstract: Device for the indication of different operating conditions of motor vehicles, particularly automobiles, with a number of light sources which are coordinated to the individual operating conditions, a corresponding number of focusing hoods receiving the light sources, the focusing hoods being arranged in a row adjacent to one another, an inspection glass covering the focusing hoods on its end which faces the observer and a strip printed with symbols, which strip is insertable between the focusing hoods and the inspection glass, the strip being translucent to light at least in the area of the symbols, and means for pressing the strip on the front sides of the focusing hoods. Elevations projecting against the inspection glass are engraved into the strip.