Abstract: An extremely reliable, easily portable perimeter alarm system. It is comprised of a light beam controlled radio transmitter and personal warning devices capable of individually warning preoccupied highway workers of the imminent danger present when an errant vehicle violates the established perimeter of a work site. This warning will allow the workers to take evasive action and potentially avoid injury and/or death. It is also the object of this invention to allow for an extremely reliable, easily portable perimeter penetration alarm system that can be utilized in other appropriate settings by security guards, military personnel, etc., and which would provide for confidential notification to such personnel that a temporarily established portable perimeter line had been violated.

Abstract: A motor control having mechanical switching and pressure reponsive components for connecting and intercepting a circuit between an A.C. source and an A.C. motor in response to pressure changes in a pressure system. The control includes a microcomputer chip and components that detect a voltage across the motor and a current through the motor and provide signals indicative of the level of the motor voltage and current. The control in response to the signals determines the power factor of the current and in response to the detected signals protects the motor from operating malfunctions when the voltage is too high or low, the current is too high or too low, the time of operation of the motor is too long or too short and in response to the character of the malfunction provides a visual coded lamp indication of the cause of the malfunction.

Abstract: An indicating device adapted to indicate a flat or severely underinflated tire. The device is activated by the enlargement in the diameter of the underinflated tire caused by centrifugal force acting on the tread, and may be especially useful on dual wheels although it will work on others as well. The device includes a contact device which will be contacted by an expanding tire. That contact tilts a switch to cause a circuit to be completed to light a signal lamp in the cab of the truck.

Abstract: The test apparatus of the present invention tests the power supply on a military aircraft, which power supply provides power to missiles carried by the aircraft. The apparatus tests for an overvoltage condition, wherein the power supply output exceeds the maximum allowable voltage of the missiles. The test apparatus includes an electrical connector for interfacing the test apparatus with the aircraft power supply, and an electrical comparator that compares the voltages from first and second inputs. The first input is clamped to a voltage which is representative of the maximum voltage limit of the missiles and the second input is tied to the output of the aircraft power supply so as to vary with the power supply output. The comparator activates a warning lamp when the second input voltage exceeds the first input voltage to warn an operator of an overvoltage condition.

Abstract: A folding electronic device comprises a body and a cover member, rear walls of which are rotatably coupled with each other by hinges. When the cover member is closed, the rear wall of the cover member is positioned rearwardly beyond the rear wall of the body while the lower end of the rear wall of the cover member is positioned downwardly beyond the upper end of the rear wall of the body. A clearance defined between the rear walls of the body and the cover member is blocked by a closing member which is provided in the body. A spring is mounted on the closing member to rearwardly urge the same. Due to the urging force of the spring, the closing member is in contact with the rear wall of the cover member when the cover member is closed and when the same is opened by 180.degree., as well as when the same is being opened/closed.

Abstract: An apparatus for automatically suppressing the audible arm and disarm signal associated with an automobile anti-theft system includes a control circuit connected between an anti-theft system and its sound emitter. A photoresistor cell is connected to the control circuit to indicate whether the light level is above or below a threshold level, e.g. to distinguish day from night. In the day, the control circuit is bypassed and the system functions normally. At night, the control circuit suppresses the system signal for a short interval, e.g. two seconds, to eliminate the audible arm and disarm signal. The short suppression interval does not significantly interfere with an intruder alarm signal.

Abstract: A method and apparatus for enabling the continuous monitoring of the operational state of circuit components includes a scheme for generating a plurality of voltage signals representing neutral-to-line voltages of the system and adding to each of those signals a second signal, each second signal being identical. This addition is done vectorially to yield a modified signal. A representation of the modified signal as acted upon by the circuit to be monitored is compared with a representation of the neutral-to-line voltage signal to yield an output signal representative of the operational state of the circuit components.

Abstract: The present invention relates to a frequency converter circuit which can be used in a receiving apparatus for receiving a satellite broadcast and which is designed so that a local oscillation signal is distributed and supplied from a single local oscillator to mixer circuits of electric signal processing circuits of more than two systems and mixer diodes of the mixer circuits are biased with a dc current thereby always applying a biasing with the dc current even to the mixer diode of the electric signal processing circuit of the system which is not operated, and there are advantages of ensuring a stable operation, making possible a reduction in the size and weight and making favorable from the cost point of view.

Abstract: A Mercedes Benz hood ornament structure is modified to include an alarm actuator switch connected to the vehicle horn. The spring-loaded restraint which holds the hood ornament element in its upright position is affixed with a sliding contact which rises into contact with a fixed contact when the hood ornament is deflected forwardly. The two contacts are wired into the horn circuit so that the horn is actuated when the ornament element is deflected forwardly, and the geometry of the mounting for the hood element is such that deflections rearwardly and sideways, such as might occur by accident or in a car wash, will not actuate the horn.

Abstract: A method capable of displaying the message at one time by detecting a message of 12 digits when receiving the message over 15 digits in a paging receiver of a POCSAG code system. According to one aspect of the present invention, in a paging receiver system having a display for 12 digits and utilizing a POCSAG code transmitting 5 digits per message code word.

Abstract: A method for producing reflectors in a continuous length of optical fiber is disclosed. The present process includes the steps of preparing the ends of two or more optical fibers, placing one or more of these fibers in a vacuum system and applying a metallic or dielectric coating to the fiber ends, and then fusing the prepared, coated ends of the fibers together until the reflectivity of the region reaches a desired value.

Abstract: A novel electro-mechanical switch device is disclosed which is suitable for use in a factory production line to detect and control the flow of workpieces or articles of manufacture along the line. The switch device includes a pair of switches (101, 102) operative in response to the workpieces passing thereby along the production line, a switch circuit (13) electrically connected to the switches (101, 102), and a moisture detector (15). The pair of switches are so designed that the operation of one switch is delayed with respect to the other. The switch circuit (13) functions in response to the operation of the switches and the moisture detector (15) to provide a warning signal when one of the switches fails to operate within a predetermined delay time with respect to the other switch, as well as when the moisture detector senses a presence of moisture.

Abstract: Disclosed is a time division multiplexed optical communication system that is capable of operation at relatively high bit rates and that is relatively stable and immune to crosstalk and noise. The system comprises receiver means wherein the timing signal for demultiplexing is derived from the fully multiplexed optical pulse stream by means that comprise a narrow band receiver and timing means that produce a lower-frequency timing signal from the output of the narrow band receiver. The timing signal is used to drive one or more optical switches. In one embodiment of the invention the receiver means have a binary-tree architecture and the timing signals are substantially sinusoidal. In another embodiment the receiver means have a linear-bus architecture and the timing signals are pulse-like.

Abstract: A novel way of powering a remote visual display and allowing data interchanges over the same wire pair. Such a station may be used for displaying the time, paging a person or an advertising message. The wire pair that powers a remote visual display also carries the electrically encoded message signal. On the same wire pair there is provision for the master message input station to exchange data with slave message input stations without message collision. Information from an input station key pad is captured by the microprocessor which converts the message to a serial binary signal. This signal drives a power transistor which converts a full wave rectified a.c. power current to a pulse width modulated signal which drives the wire pair connected to a remote visual display. The remote visual display power supply rectifies these signal pulses for power to drive the control circuits and display mechanism (light sources or light reflectors) and decodes the pulse width for display message information.

Abstract: A housing for a surface-mount magnet and magnetically sensitive switch unit pair for use in an intrusion detection device. The switch and magnet units include a generally cylindrical housing member formed with a hollow interior cavity, which contains the switch or magnet. The exterior surface of the housing member is threaded and has an end cap formed to receive a screw driver. The units are installed by screwing the housing member directly into the supporting structure. The housing member of the switch unit is further formed with a laterally projecting positioning surface for postioning the switch unit against a surface of the door or window assembly and determining the depth to which the unit is inserted.

Abstract: A test circuit for an airbag restraint system is disclosed and provides an accurate determination of the operativeness of a storage capacitor and calculates the resistance of inertia switch resistors. The capacitor is tested by discharging and charging the capacitor. The values of the inertia switch resistors are determined by switching known resistive values in parallel with the inertia switch resistors. Based on the monitored voltage values during the switching, resistance values are calculated.

Abstract: The operability of a photoelectric sensor is tested by creating both an ON TEST and an OFF TEST. During the ON TEST a test light source, such as a light-emitting diode (LED), located in the vicinity of the light-detecting elements of the photoelectric sensor, is enabled to be energized. Alternatively, the light-detecting elements of the photoelectric sensor are by-passed and the output of the light-detecting elements directly energized. The ON TEST LED (or the by-pass) is interconnected with the circuit that controls the energization of the normal or operational light source(s) of the photoelectric sensor such that the ON TEST LED will only ignite (or the by-pass will only operate) if current flows through the operational light source(s). If the operational light source(s) are damaged and, thus, current cannot flow, the ON TEST LED will not light (or the by-pass will not produce an energizing voltage).

Abstract: An automotive alarm system that provides the driver of a following vehicle with two different brake signals, related to the foot pressure that the driver of the leading vehicle is applying to his brake pedal. The multi-signal brake signal system alerts the driver in the following vehicle when the leading vehicle is undergoing a panic stop action, thereby enabling the driver in the following vehicle to possibly avoid a rear end collision with the leading vehicle.

Abstract: An improved apparatus for monitoring a respiratory circuit comprises two independent pressure sensing means, a first pressure sensing component having a preset minimum pressure for creating an alarm condition in response to pressure falling below the minimum, and a second pressure sensing component having an adjustable low pressure threshold setting means and for creating an alarm condition if the patient's breathing cycle pressure fails to periodically pass through the low threshold pressure. A preferred embodiment includes visual pressure indicating means including a display of the low threshold pressure setting and a display of the patient's breathing cycle pressures.

Abstract: A photovoltaic device is provided that is adapted to monitor an "on-line" light source and respond to on/off changes of the source while at the same time being adapted for visual inspection of the light. The device is adapted for incorporation into a remote warning system which may also be able to activate remedial measures to correct deviations signalled by a change in the "on-line" light status.