Abstract: A sensor has a substrate with a first surface having a substantial area, a conductive trace defining a conductive path on the substrate between first and second locations, and an adhesive on the first surface for adhering the sensor to an object to be monitored in an operative state. A weakening is provided in the substrate to cause separation/tearing of the substrate in a predetermined fashion as an incident of a force being applied to the substrate with the sensor in the operative state tending to peel the sensor off of the object to be monitored. The conductive trace is arranged on the substrate so that as the substrate separates/tears in the predetermined fashion, the conductive path defined by the conductor trace is interrupted.
Abstract: A fire detector, for connection in a fire protection/alarm system, comprises an array of sensors, or a single sensor, of the semiconductor resistor type impregnated with a noble metal. The detector is responsive, by way of a decrease in its resistance, to an increase in any one or more parameters indicative of a fire, namely the atmospheric concentrations of carbon monoxide, hydrogen and water vapor, and temperature, so that a fire is detected regardless of which of these indicators is present. The sensor responds to all of the parameters, and the output signal simultaneously represents changes in all the parameters.
Abstract: An heat alarm for an electric panel cabinet mounts a heat sensor within the enclosed area defined by the electric panel cabinet to monitor the temperature within the cabinet and sound an alarm if the temperature in the cabinet exceeds an upper temperature limit. The heat alarm includes a mounting arrangement positioned between the enclosure of the heat alarm and the electric panel cabinet such that the heat alarm can be mounted to the electric panel cabinet and the heat sensor positioned within the cabinet. The mounting arrangement of the heat alarm is formed of a thermally non-conductive material such that the enclosure containing the heat alarm is thermally isolated form the electric panel cabinet such that the enclosure of the heat alarm does not affect the temperature within the cabinet.
Abstract: A system for locating an object. The system includes an electronic device, a wireless transmitter for outputting a transmitted signal, and a receiver wherein one of the receiver or the transmitter is mounted within the electronic device and the other is positioned remote therefrom. The receiver comprises a wake up timer circuit for periodically generating a wake up signal, a wireless signal receiver being activated by the receipt of the wake up signal from the wake up timer circuit for generating a detect signal when the wireless signal receiver circuit receives the transmitted signal from the transmitter; and an audible signal generator circuit for generating an audible signal upon receipt of the detect signal from the wireless signal receiver circuit. The wake up timer circuit and the wireless signal receiver circuit are disabled when the audible signal generator circuit generates the audible signal.
Abstract: An alarm device is provided with a temperature sensor for detecting an internal temperature of a magneto-optical disc drive unit having a cooling fan and a replaceable dust filter. When the internal temperature becomes higher than or equal to a predetermined temperature due to the breakdown of the fan or the silting of the filter, the alarm device indicates an abnormal condition of the drive unit by flashing an operation indicating lamp.
Abstract: A warning apparatus for monitoring a plurality of threat sectors includes a receiving antenna for each threat sector for receiving electromagnetic radiation, an alarm channel for each respective threat sector and an amplifier interconnected between an output of the antenna on an input of the alarm channel. The alarm channel includes a high pass filter, a rectifier, an integrator and a comparator connected in series, an input of the filter constituting the input of the alarm channel, an output of the comparator constituting an output of the alarm channel. A threat sector activator is connected to an output of the comparator and activated by an output signal from the comparator in response to an input signal applied to the comparator from the integrator which exceeds a reference level, the activated threat sector indicator of the respective alarm channel indicating the threatened sector.
Abstract: An electronic article surveillance system is provided that comprises a core-wound drive coil which produces an AC magnetic interrogation field, and a detection coil provided on one side with at least one element of a screening material, which detection coil detects an AC magnetic response field generated by a magnetically active tag or marker which is subjected to the interrogation field when the tag or marker comes in proximity with the detection coil. The screening material may take the form of an open-ended electrically conductive box having an insulating gap along its length, or a laminate consisting of a plurality of metal foils interleaved with an electrically insulating material. The invention provides well-defined flux control for the detection coil which preventsinterference from unwanted external magnetic fields.
December 26, 1991
Date of Patent:
September 6, 1994
Esselte Meto International Produktions GmbH
Abstract: A security system for use with garments and the like mounted for display on a display fixture includes an alarm box adapted to be mounted at a location proximate display fixture, with a key switch for arming and disarming an alarm contained therein. The alarm box sounds an alarm when security conditions are breached. A plurality of garment cables connect individual garments to the system by use of plugs and jacks. A common cable connects the plurality of garment cables to a common connection using jack ports for receiving plugs on each of the garment cables. The common cable connector is adapted to fasten the common cable connector to a garment display fixture. The common cable connector includes a cover protectively enclosing the jacks so that the common cable connector may be locked when the cover is in a closed position. The cover is hinged with internal hinge to prevent access to the hinge in the closed position.
Abstract: An electronic security system provides electronic security for garments and the like. The system includes an electronic alarm box having a plurality of cable receiving jacks for receiving cables from individual objects. Also part of the system is a display fixture having at least one object for security protection. Finally, the system includes at least one cable having an electronic security clip device which attaches to the object and which sounds an alarm when the device is removed without authorization. The clip device is attached at one end of a cable, with the other end of the cable being plugged into the alarm box. The clip includes a pair of opposing jaws pivotably mounted on the clip in a normally closed position. The clip also includes a switch for activating the alarm upon placement of an object in the jaws of the clip, whereby removal of the object causes the switch to trigger the alarm.
Abstract: A flame detector unit contains a silicon photodiode that is sensitive to UV light waves and two lead selenide photoresistors that are sensitive to IR light waves. The electromagnetic bandwidth of each sensor element is restricted by an optical wave filter to pass photons of certain wavelengths characteristic of hydrocarbon flames and to discriminate against photons of other wavelengths. Signals generated by the IR sensors are in the form of variations in electrical resistance of the sensor elements, which together with a resistor network comprise a bridge circuit which combines the two IR signals so as to discriminate against blackbody radiation sources and provide a signal which is fed through an amplifier. Amplified UV and IR signals are fed to a common analog to digital converter (ADC). Output from the ADC is fed to a digital processor through a notch filter, a cluster of weighted-moving-average filters, and into a threshold comparator/tester.
July 21, 1992
Date of Patent:
August 16, 1994
Jeffrey S. Yalowitz, James M. Morrison, Hilary E. Roberts
Abstract: A fire detector installed in a low ceiling surface of a vehicle such as an aircraft or train is equipped with an antitampering measure for preventing tampering such as covering the exposed portion of the fire detector with a paper cup or a vinyl bag or such as by sticking chewing gum or tissue paper in the smoke inlet portions thereof. Such tampering is usually carried out by passengers trying to sneak a smoke in a non-smoking area. The fire detector includes a main body having a head portion for letting in combustion products and a fire detection portion for performing fire detection on the basis of the combustion products let in from the head portion, and a mounting portion containing most of the main body and provided with a central opening portion for allowing the head portion to protrude from the ceiling surface so as to perform fire monitoring.
Abstract: An oscillator which produces a continuous wave output signal on an antenna having a preset frequency. A detection circuit detects changes in the preset frequency resulting from proximity between the antenna and an object and when such an object is detected, the detection circuit generates an output signal. A compensation circuit is also provided for compensating for changes of the preset frequency which are caused by factors other than proximity of the antenna with an object. Such other factors include radio frequency interference, long term component degradation, temperature, and the like.
Abstract: A personal safety guard system enables a guardian or caretaker of a person or pet to transmit an alarm condition signal from a hand-held unit carried by the guardian. When the alarm condition signal is received by a portable alarm unit adapted to be worn by the person or pet under the guardian's supervision, the alarm unit operates to alert the wearer that its guardian is looking for them, and to alert others nearby that the wearer is in need of assistance by producing a number of different alarm indicators. The alarm indicators produced by the portable alarm unit include an intelligible voice message such as "Help, I'm lost" which is alternately sounded with a loud alarm sound, and flashing strobe lights. These alarm indicators, together with a confirmation signal transmitted from the alarm unit to the guardian's unit, enable the guardian to track and find their charge.
Abstract: A pair of spaced elongate primary security members extend in a first direction, and each has a plurality of longitudinally spaced openings. The ends of a plurality of elongate secondary security members, extending in a second direction which is transverse to the first direction, are located in aligned openings in the primary security members. The ends of the secondary security members are thereby held captive in the primary security members. The secondary security members span a space between the primary security members, and the secondary security members are thus spaced apart from one another. A tertiary security member supports the secondary security members between the primary security members. An electrically operable burglar protection system, having an alarm, is connected to the security members.
Abstract: A marker assembly adapted for use with an electronic article surveillance (EAS) system, and particularly for use with books to be monitored by an EAS system, includes a flat elongated, marker strip of low coercive force, high permeability ferromagnetic material, adhesive layers carried on both the front and rear surfaces of the marker strip and a release liner which extends along the rear surface of the marker strip, around opposed end margins of the marker, and along the front surface thereof, terminating at the approximate midpoint of the marker strip with opposed, graspable tabs carried clear of the adhesive layer on the front surface. Pulling the opposed tabs away from each other removes the wrapper from the front surface, thereby exposing the adhesive carried on that surface and allowing attachment of the front surface to a selected page of the book.
October 1, 1992
Date of Patent:
July 19, 1994
Minnesota Mining and Manufacturing Company
Abstract: A key-configured transmitter design has a housing for containing the electronics thereof and a key blank which may optionally be cut to conform to the key shape of the vehicle ignition key or any other key the user might otherwise use on a regular basis. In this manner, it is possible to substitute the transmitter of the present invention for a key that the user would otherwise retain in his pocket or purse, thereby obviating the relative inconvenience of prior art transmitters, which require the addition of a transmitter device to their pocket or purse. The key blank serves the dual purpose of a real key such as for operating the vehicle's ignition and also as an antenna for radiating the oscillator signal produced by the transmitter of the invention.
Abstract: An alarm device has an actuating member for energising the alarm, the member being placed in its actuating state by passive action on the part of the user in the case of an emergency. A preferred form of actuating member according to the invention is a ring pull, in which the alarm device is caused to operate by the ring pull being pulled away from the remainder of the device.
Abstract: A sensor has a reduced probability of generating a false alarm in the presence of a strong high frequency acoustic wave, such a false alarm being caused by the saturation of the microphone which is part of a single microphone glass break sensor. The sensor improves an alarm system's immunity to false alarms by using two microphones instead of one, wherein each microphone is used in combination with a filter and a signal processing stage to detect one of the characteristic components of an acoustic wave generated in a glass break event. The microphone used to detect the low frequency component is fitted with an acoustic filter which attenuates the high frequency component of the wave. This reduces the probability of a false alarm by ensuring that the low frequency electrical signals fed to the alarm system's logic and timing circuit are generated by an external event rather than by the microphone itself.
Abstract: Apparatus utilizing change in pressure condition in an area to be protected to indicate intrusion or change in conditions of the area by using a pressure detection device to detect pressure waves at low and infrasonic frequencies which includes a pressure transducer sensitive to change in pressure to provide an output signal. In some instances an amplifier is provided to amplify the output signal, a signal conditioning circuit is provided to delay a portion of the signal, and a detector device is provided to detect the signal with a comparator provided to compare the signal with the delayed signal and actuate an alarm..Iadd.Additionally, a device producing signals responsive to pressure waves and selected sonic frequencies is taught. If the signals are coincidently received at a coincidence detector, an alarm is activated. Further, the signals can be stretched and/or delayed before receipt at the coincidence detector. .Iaddend.
May 19, 1992
Date of Patent:
November 15, 1994
Blue Grass Electronics, Inc.
Elden E. DuRand, III, William K. Logsdon