EP0116701B1 - Dispositif antivol - Google Patents

Dispositif antivol Download PDF

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Publication number
EP0116701B1
EP0116701B1 EP83112050A EP83112050A EP0116701B1 EP 0116701 B1 EP0116701 B1 EP 0116701B1 EP 83112050 A EP83112050 A EP 83112050A EP 83112050 A EP83112050 A EP 83112050A EP 0116701 B1 EP0116701 B1 EP 0116701B1
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EP
European Patent Office
Prior art keywords
circuit
surveillance
theft system
sensor
resistor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83112050A
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German (de)
English (en)
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EP0116701A1 (fr
Inventor
Reinhold Ott
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Individual
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Individual
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25807810&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0116701(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE19833302459 external-priority patent/DE3302459A1/de
Priority claimed from DE19833314187 external-priority patent/DE3314187A1/de
Application filed by Individual filed Critical Individual
Priority to AT83112050T priority Critical patent/ATE27661T1/de
Publication of EP0116701A1 publication Critical patent/EP0116701A1/fr
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Publication of EP0116701B1 publication Critical patent/EP0116701B1/fr
Expired legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles
    • G08B13/1445—Mechanical actuation by lifting or attempted removal of hand-portable articles with detection of interference with a cable tethering an article, e.g. alarm activated by detecting detachment of article, breaking or stretching of cable
    • G08B13/1454—Circuit arrangements thereof
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation

Definitions

  • the invention relates to an anti-theft device for goods according to the preamble of claim 1.
  • Such an anti-theft device is described in US-A-3253270.
  • a specially designed ammeter monitors the monitoring current generated by the monitoring current source in the monitoring circuit with regard to deviations from larger and smaller values. In both cases, which correspond to an interruption or a short circuit in the monitoring circuit, an alarm is inevitably triggered.
  • the monitoring circuit has several connection points for sensors working with a product, each of which has a monitoring loop with a resistor adjacent to the product. At the individual connection points of the monitoring circuit, bridging resistors are provided, the value of which corresponds to the sensor resistances and which, if the connection point is not used, are switched into the monitoring circuit instead of the sensor resistors, but are removed from the monitoring circuit when a monitoring cable is plugged into the connection point.
  • a similar anti-theft device in which a monitoring current is also monitored both with regard to short circuits and with regard to interruptions in the monitoring circuit, is described in GB-A-1 389009. Here, too, it is not possible to connect further monitoring points if theft protection is sharp.
  • DE-A-2412145 describes an anti-theft device for goods, which comprises a three-wire system, positive and negative deviations in the current and voltage conditions on the three wires from predetermined target values triggering an alarm. With this anti-theft device, too, the main switch must be turned off when connecting new goods to be monitored, which again leads to the disadvantages described above.
  • the present invention is intended to further develop an anti-theft device according to the preamble of claim 1 such that loosening the connecting cable leading to a sensor from the monitoring circuit continues to trigger an alarm, while connecting a connecting cable to the monitoring circuit takes place when the anti-theft device is switched on without triggering an alarm can.
  • an anti-theft device according to claim 1.
  • a current of a predetermined amplitude and / or frequency and / or phase position is obtained at the input of the monitoring circuit with a proper connection between the monitoring circuit and the goods. If the connection between the goods and the sensor is broken during an attempted theft, the signal at the input of the monitoring circuit changes in terms of amplitude and / or frequency and / or phase position, and an alarm is triggered by the monitoring circuit upon such a signal change.
  • An alarm is triggered equally if, in preparation for an attempted theft, the conductors of the connecting cable are short-circuited or cut, since in this case too the signal at the input of the monitoring circuit has an amplitude, frequency or phase position which deviates from the normal state.
  • Sensors that change the amplitude, frequency or phase position of a current depending on the displacement of their input element are e.g. Potentiometers, strain gauges, capacitive and inductive position transmitters or simply switches. It is important that these sensors, if they work properly with the goods and the connection cable to the monitoring circuit is properly connected, define a current that has a finite amplitude, a finite frequency or a predetermined phase position.
  • the amplitude or frequency is then reduced when an attempt is made to short-circuit the connecting cable or a current is generated which no longer has a clear phase position. If the connecting cable is interrupted, the modification of the current flowing through the monitoring circuit is omitted, which is also recognized by the latter.
  • the anti-theft device according to the invention even those monitoring circuits to which no sensor is connected are not yet activated when the monitoring circuit is switched on. Only when a sensor is connected is the assigned monitoring circuit armed by a current flowing through the corresponding plug connection. This considerably simplifies the handling of the anti-theft device in practical use, especially if it has a large number of parallel monitoring channels.
  • the plug connection between the sensor and the detector circuit need only be two-pole, as is necessary anyway for closing the monitoring circuit.
  • the monitoring circuit-side contacts of the connector of the connecting cable and the input contacts of the monitoring circuit also serve as switches of the activation circuit. A separate switch for arming is therefore not necessary.
  • An anti-theft device continues to work even in the event of a power failure. This ensures that the expensive battery is not damaged by deep discharge if the mains voltage is switched off for an extended period of time.
  • the same advantage is obtained with the development of the invention according to claim 16, but here the protection against deep discharge is brought about by time control.
  • the development of the invention according to claim 17 also makes it possible to monitor goods which have no electrical connections, if only a continuous closed opening is provided on the goods, through which the end section of the connecting cable lying between the connector splitters can be pulled, so that after a monitored cable loop is obtained when these connector parts are joined together.
  • the development of the invention according to claim 19 is advantageous in terms of low sensor costs and sharply defined signal changes when attempting theft.
  • a relatively simple monitoring circuit can also be used to determine the presence of such sharp signal changes.
  • FIG. 1 shows a system for monitoring various devices exhibited in a sales room.
  • a battery-powered cassette recorder 10 A, a radio 10 C, a power strip 10 D for connecting further devices to be monitored and a drill 10 E are connected to input sockets 14 A, 14 C and 14 D of a monitoring unit 16 via connecting cables 12 A, 12 C and 12 D connected.
  • the power cable of the drilling machine 10 E is plugged directly into a modified mains socket 18 of the monitoring unit 16; another input socket 14 B of the monitoring unit 16 is not occupied.
  • light-emitting diodes 20 A to 20 E are arranged, each of which is assigned to one of the input sockets 14 A to 14 D or the mains socket 18 and are switched on by a monitoring circuit contained in the housing of the monitoring unit 16 when that of the assigned input socket downstream plug connections are solved.
  • a loudspeaker 22 is also subjected to audio frequency signals by the monitoring circuit.
  • a lock switch 24 for switching on and disarming the monitoring system, a display device 26 for the supply voltage of the monitoring circuit and a further light-emitting diode 28, which lights up when the mains voltage is present, are also carried by the front plate of the monitoring unit 16.
  • the monitoring system shown in FIG. 1 is supplied with current via a mains cable 30. If the devices connected to the socket strip 10 D are to be ready for operation, the current required for this is provided via a further mains cable 32.
  • the monitoring unit 16 is set up in a part of the sales outlet that is not accessible to buyers and prospective customers and is connected by cable to the various devices on display, as described above.
  • the connecting cables 10 A and 10 C have modified standard plugs which fit into corresponding standard sockets of the cassette recorder 10 A or the radio 10 C. The modification made is roughly speaking such that a signal is provided in each case which provides different values when the plug is not inserted or the plug is properly inserted.
  • the sockets of the power strip 10 D and the mains socket 18 are modified such that different signals are provided when the socket is not occupied and when the socket is properly occupied with a plug. Details of the modifications to the plugs and sockets as well as details of the monitoring circuit will now be described in more detail below.
  • FIG. 2 shows details of a plug 34, which is connected to the end of the connecting cable 10 C and fits into a standard connection socket of the radio 10 C.
  • a lower housing part 36 and an upper housing part 38, both plastic injection molded parts, are firmly connected to one another.
  • the housing part 38 carries a cylindrical outer conductor 40, in which an insulating body 42 is inserted. In the latter, a plurality of plug contacts 38 are embedded protruding on both sides.
  • An actuating pin 52 which has a transverse nose 54, is guided in an axial through-bore 50 of the insulating body 42. This specifies the fully extended position of the actuating pin 52 by a stop on the underside of the insulating body 42, and a wire bow spring 56 supported on the lower housing part 36 engages it.
  • the actuating pin 52 is provided with a ramp surface 58, via which a switching pin 60 of a microswitch 62 is actuated when the actuating pin 52 is pressed downward through the end face of the socket insulating body in FIG. 2 when the plug is inserted into a socket becomes.
  • FIG. 3 shows a jack plug 64 which is connected to the end of the connecting cable 12 A and fits into a headphone socket on the 10 A cassette recorder. An axial groove 68 is machined into a plug part 66, in which a leaf spring 70 is arranged to be freely bendable.
  • the second end of the leaf spring is attached to the rear end of the plug part 66.
  • the leaf spring 70 has a convex working section 72 protruding outwards from the groove 68.
  • a strain gauge 76 is fastened on a bending section 74.
  • the plug part 66 is fixed in a conventional plastic handle part 78.
  • the resistance of the strain gauge 76 has two different values, depending on whether the working section 72 has moved completely into the groove 68 when the plug is inserted or protrudes from the groove 68 when the plug is removed.
  • FIG. 4 shows a section through a mains socket 80 modified for monitoring purposes with a socket housing 82 and resilient socket parts 86, 88 carried by the latter via an insulating body 84 and which can work together with the pins of a mains plug.
  • Passages 94 for the pins of the plug are provided in the bottom 90 of the plug receiving chamber 92 of the socket housing 82.
  • passages 96 in the insulating body 84 these align with the socket parts 86, 88.
  • an actuating pin 98 extends transversely in the insulating body 84 into one of the passages 96 and works on a microswitch 100 fastened to the socket housing 82 and has a ramp surface 102 at the opposite end.
  • the output signal of the microswitch 100 can be used to determine whether or not there is a plug in the socket, the socket still being able to pass on the mains voltage to a connected consumer.
  • FIG. 5 shows a simple monitoring circuit for use with a socket strip which contains a plurality of modified mains sockets according to FIG. 4.
  • each of the microswitches 100 is a changeover switch with a normally open contact and a normally closed contact.
  • a spring 104 serves to bias a switching bridge 106 into an upper working position.
  • the output contacts of each of the microswitches 100 are connected together via a bridge 108, and the output of a microswitch 100 is connected to the input of a subsequent microswitch (with the exception of the terminal microswitch), as can be seen in the drawing.
  • a supply voltage which is provided by the monitoring unit 16, is applied to the first microswitch 100 via a line 110, while the last microswitch is connected to the monitoring unit via a further conductor 112.
  • the conductors 110 and 112 together form a connecting cable which corresponds to the connecting cable 12 D from FIG. 1.
  • the conductor 112 is connected to the set terminal of a bistable multivibrator 114, and an alarm unit 116 is connected to its “1” output.
  • a switch 118 which can be formed by the lock switch 24 or is part of the same, is used to switch off the alarm unit 116 and is connected to the reset terminal of the flip-flop 114.
  • not all of the sockets of a power strip need to be mated with a plug or a dummy plug so that no alarm is triggered since the microswitch 100 has a passage from the input to the output in both switching positions.
  • An alarm is triggered when one of the switching bridges 106 is moved from one working position to the other, that is to say when a plug is pulled out of one of the mains sockets 80 or when a plug is inserted into a mains socket.
  • an output-side OR gate 120 is connected with an input directly to that contact of the assigned microswitch 100, against which the switching bridge 106 is pressed when the plug is inserted.
  • the other contact of the microswitch 100 which is connected to the input of the switch unit by the switching bridge 106 in the unloaded state, is on the one hand directly connected to a second input of the OR element 66 and on the other hand via an inverter 122, a differentiating element 124 and one Diode 126 connected to a monostable multivibrator 128.
  • the output of the latter is connected to a third input of the OR gate 120.
  • the switching bridge 106 is moved out of the state shown in the wiring of a microswitch 100 shown in FIG. 6, the signal at the middle input of the OR gate 120 is omitted, but at the same time the output signal of the monostable multivibrator 128 is obtained, so that a total Signal at the output of the OR gate 120 is retained.
  • the switching bridge 106 is now quickly moved into its lower working position, as is the case when a plug is inserted into a network socket is readily possible, the lowest input of the OR gate 120 is supplied with a signal before the output signal of the monostable multivibrator 128 has ended. If, on the other hand, the switching bridge 106 is moved away from the contact of the microswitch 100 in FIG. 6 when a plug is withdrawn from the socket, a voltage drop at the output of the OR gate 66 is obtained and an alarm is thus triggered.
  • FIG. 7 shows the essential part of the electrical circuit of a system for monitoring exhibited goods against theft, the basic structure of the circuit being similar to that already shown in FIG. 5, but additional measures have been taken to also ensure that the goods being monitored by the monitoring unit 16 are manipulated leading connecting cable to trigger an alarm.
  • the socket strip shown in Figure 1 consists of a plurality of sockets 80 according to Figure 4, of which only the microswitch 100 are shown in Figure 7.
  • a resistor 131 is connected via the plug contacts of the connecting cable 12 D that can be connected to the input socket 14 D, and a resistor 130 is connected to the conductor 110 inside the power strip 10 D.
  • the conductor 112 is connected to a ground line 134 via a further resistor 132.
  • Via a further resistor 136 the signal on line 112 reaches one of the inputs of three differential amplifiers 138 A, 138 B and 138 C. Their second inputs are also connected via voltage dividers formed by resistors 140 A, B, C and 142 A, B, C. applied to the potential on the conductor 110.
  • the voltage dividers just mentioned are selected such that the reference voltages decrease from the differential amplifier 138 A to the differential amplifier 138 C.
  • the aforementioned voltage dividers are matched to the voltage divider formed by resistors 130 to 132 in such a way that an output signal is obtained at the output of differential amplifier 128 A if conductors 110 and 112 are short-circuited during an attempted manipulation while an output signal is received at differential amplifier 138 B. when one of the microswitches 100 is opened briefly when the switching bridge is moved from one working position to the other or an interruption in one of the conductors 110, 112 is caused.
  • the differential amplifier 138 C connected in the opposite way to the differential amplifiers 138 A and 138 B is provided, which then does not generate an output signal if the assigned input socket of the monitoring unit is not bridged by a resistor 131.
  • the output signals of the differential amplifiers 138B and 138C are combined by an AND gate 142.
  • the output signal of the latter like the output signal of the differential amplifier 138 A, is passed via an OR gate 144 to the set input of the bistable multivibrator 114 already mentioned with reference to FIG. 5.
  • a capacitor 146 is connected between the inputs of the differential amplifier 138 and the ground line 134.
  • the capacitor 146 is slowly discharged, so that an operating state is temporarily obtained in which a signal is present at the outputs of both differential amplifiers 138 B and 138 C, so that an alarm is triggered.
  • the capacitor 146 is constantly discharged, so that such an intermediate state is not reached, that is to say that no signal can be obtained at the output of the AND gate 142.
  • the “1” output of the flip-flop 114 and an amplifier 148 excite the LED 20 associated with the input of the monitoring unit 16 under consideration.
  • the output signals of the flip-flops 114 assigned to the various inputs of the monitoring unit are combined via an OR gate 150, which controls an acoustic alarm unit 154, to which the loudspeaker 22 belongs, via an amplifier 152.
  • the reset terminals of the flip-flops 114 are supplied with the supply voltage via an RC element 155, 157, so that an alarm can be cleared simply by switching the monitoring unit off and on again.
  • the signal processing channels assigned to the other inputs of the monitoring unit 16, of which only the bistable flip-flops 114 are shown in FIG. 7, are constructed analogously to the above-described signal channel for the signal channel assigned to the input socket 14 D, only these signal channels do not contain their own voltage dividers; the reference voltages across conductors 156 A, 156 B and 156 C.
  • FIG. 8 shows details of the voltage supply for the circuit part shown in FIG. 7.
  • a power supply 158 designed for low power is supplied with the mains voltage on the input side and provides a DC voltage on the output side. This output voltage is passed via two switching transistors 160 and 162 to a supply line 164, to which a voltage regulator 166 is also connected.
  • the conductor 110 is connected to the output of the latter.
  • a charge / discharge circuit for a dry accumulator 168 which has a charge resistor 170 and a discharge diode 172, is inserted between the switching transistors 160 and 162.
  • the switching transistor 160 is opened; the corresponding basic control circuit comprises the series connection a resistor 174 and a capacitor 176 through which the output terminals of the power supply 158 are connected.
  • a protective diode 178 is inserted between the switching transistor 160 and the charge / discharge circuit for the dry accumulator 168.
  • Its control circuit includes a differential amplifier 180 which is supplied with the output voltage of the dry accumulator 168 via a high-resistance voltage divider with resistors 182, 184 and is also supplied with a constant reference voltage from a Zener diode 186 when the dry accumulator 168 reaches the limit a deep discharge is discharged.
  • the Zener diode 186 is connected to the supply line 164 via a high-resistance voltage divider with resistors 188, 190.
  • the output signal of the differential amplifier 180 is applied to the base of the switching transistor 162 via an RC element 181, 183.
  • a capacitor 185 is connected to the output of the switch 24, the terminals of which are bridged by a high-resistance resistor 179.
  • the capacitor 185 is connected to the conductor 132 via a further resistor 187 and to the base of the switching transistor 162 via a diode 189 and a Zener diode 191 connected in series therewith. If after a deep discharge of the dry accumulator 168 the connection to the electrical network is restored, the voltage at the output of the switch 24 increases only by a small amount, which is not sufficient to pull the switching transistor 162 into the closed state via the capacitor 185. For this reason, the base of transistor 162 is additionally connected directly to the output of switch 24 via a further Zener diode 193.
  • 195 also designates a base resistance for the switching transistor 162.
  • the signal input of the differential amplifier 180 is connected directly to the output of the power supply 158 via a resistor 192 and a diode 194, the partial ratio of the voltage divider formed by the resistors 192 and 184 being set in such a way that the signal input of the differential amplifier 180 is still switched on receives a signal lying above a deep discharge state of the dry accumulator 168 if the output voltage of the power supply 158, which is only designed for low power, partially breaks down in the event of an alarm, since greater power is now to be delivered to the alarm unit 154.
  • the switching transistor 162 thus remains closed under such operating conditions in any case.
  • the lock switch 24 is inserted between the charge / discharge circuit for the dry accumulator 168 and the switching transistor 162. If the lock switch 24 is opened, the voltages on the supply line 164 and on the conductor 110 disappear. When the lock switch 24 is subsequently closed again, a rising signal edge is obtained on the conductor 110, which edge is formed by the resistors 140 C and 142 C formed by the resistors Voltage divider is given to the reset terminals of the flip-flop 114, so that a triggered alarm is cleared.
  • the RC element 155, 157 ensures that the bistable flip-flops 114 are only reset a predetermined time after the monitoring circuit has been switched on. This ensures that switching peaks occurring during the switch-on process, which could lead to the setting of one of the bistable flip-flops 114, cannot trigger a permanent alarm.
  • FIG. 7 The operation of an anti-theft device with monitoring of the connecting cable was described with reference to FIG. 7 with reference to a multiple socket strip.
  • the monitoring of the cassette recorder 10 A and the video record 10 C is carried out quite analogously, with the only difference that in the connection cable 12 A the strain gauge 76 built into the jack plug (see FIG. 3) is connected in series from a microswitch and the resistor 130 according to FIG. 7 replaced.
  • the microswitch 62 represents the equivalent of the microswitch 100 according to FIG. 7, and in series with the microswitch 62 a resistor (not shown in more detail) is arranged in the interior of the multiple plug 34, which corresponds to the resistance 120 corresponds to Figure 7.
  • FIG. 9 shows a further anti-theft device which works on an AC voltage basis.
  • a sensing unit 200 e.g. similar to that explained with reference to FIGS. 2 and 4, can be installed in a plug or a socket, has a microswitch 202 that works mechanically with the goods to be monitored and a capacitor 204 connected in series.
  • the sensing unit 200 is connected to the Input socket 210 of a monitoring circuit 212 connected.
  • the monitoring circuit 212 contains an AC voltage source 214, via the output terminals of which two identical voltage dividers are connected, each of which has a resistor 216 or 218 and a capacitor 220 or 222 connected in series with it. In series with the capacitor 220 there is a switch 224 which is resiliently biased into the closed position ordered, which is forcibly opened when connecting the connecting cable 226 comprising the conductors 206 and 208.
  • the two inputs of a differential amplifier 228 are connected to the network nodes which are located between resistor 216 and capacitor 220 or resistor 218 and capacitor 222. Its output is connected via a diode 230 and a Zener diode 232 to the set input of a bistable multivibrator 234, which corresponds in function to the bistable multivibrators 114 according to FIG. 7 and on the output side in the manner described in FIG. 7 with an associated light-emitting diode and the common alarm unit is connected.
  • the flip-flop 234 is also reset analogously to that described above with reference to FIG. 7.
  • the capacitors 204, 220 and 222 have exactly the same electrical properties, in particular they have the same capacitance.
  • switch 224 is closed and the inputs of differential amplifier 228 are acted upon by signals of the same amplitude and the same phase position. Then no output signal of the differential amplifier 228 is obtained.
  • connection cable 226 If the connection cable 226 is properly inserted and the switch 202 is closed by the goods to be monitored, the capacitor 204, which is identical to the capacitor 220, takes over its function completely, so that no signal is still received at the output of the differential amplifier 228.
  • a switching window of the monitoring circuit is predefined by the Zener diode 232, with which the ohmic resistance of the connecting cable 226 and production-related capacitance fluctuations of the various capacitors can be taken into account.
  • the bistable flip-flop 234 is set by the first positive half-wave at the output of the differential amplifier 228.
  • An alarm is also triggered when the connecting cable 226 is unplugged because, owing to the mechanical inertia of the switch 224 and the lack of a matching of the length of the plug contacts on the input socket 210 to the working stroke of the switch 224, either an intermediate state is briefly obtained in which the resistance 216 is not connected to any capacitor at all, or an intermediate state is obtained in which the two capacitors 204 and 220 are connected in parallel. In both intermediate states, the differential amplifier 228 is not subjected to the same signals at its input terminals.
  • Figure 10 shows the goods-side section of a connecting cable, which can be used to monitor items of clothing such as coats or jackets or also to monitor other goods that do not have electrical connection sockets, but instead have a closed through opening such as a handle (e.g. handles of internal combustion-powered chainsaws, handles of Porcelain jugs etc.).
  • a handle e.g. handles of internal combustion-powered chainsaws, handles of Porcelain jugs etc.
  • the connecting cable 236 is embedded in a socket 240 at a distance from its free end, forming a U-shaped loop section 238.
  • a plug 242 is connected to the end of the connecting cable 236 and can be inserted with its two pins 244, 246 into sockets 248, 250 of the extension socket 240.
  • a resistor 252 is soldered via the sockets 248, 250, one lead 254 of the resistor 252 being passed through the loop section 238 in a chain-like manner.
  • the outermost cable section carrying the plug 242 is passed through the sleeve of a piece of clothing or the handle or handle of a product and then plugged into the socket 240.
  • a constant monitoring current flows through the connecting cable. Pulling the plug 242 out of the socket 240 results in the immediate triggering of an alarm, likewise cutting the cable 236 at any point and also violently cutting the socket 240 in the area between the sockets 248, 250 and the loop section 238.
  • FIG. 11 shows a modification of the anti-theft device according to FIG. 7.
  • the conductors connected to the network contacts 256, 258 of the individual sockets are designated 260 and 262.
  • the normally closed contact 264 of a short-circuit or overcurrent monitor 266 is inserted into the conductor 260, the actuating coil 268 of which simultaneously actuates a normally closed signal contact 270 as well.
  • the signal contact 270 is arranged in series with the microswitches 100. Instead, it is also possible to use a short-circuit monitor, which has a normally open signal contact, which is then connected upstream of the resistor 130 via the conductors 110, 112.
  • the short circuit generated during cutting triggers the short-circuit monitor 266 and thus triggers an alarm, as does pulling a plug out of the monitored power strip.
  • the conductors 260 and 262 are only subjected to a low voltage, for the sake of simplicity with the voltage on the conductors 110 and 112.
  • the short-circuit monitor 266 is then designed or set so that it does not yet respond when the switch on a device connected to the socket strip is actuated, but when cutting through a cable connected to the socket strip. In the power supply shown in FIG.
  • FIG. 12 shows an alternative embodiment of a deep discharge protection which can be used instead of the components 180 ff. From FIG. 8. Corresponding components are again provided with the same reference symbols.
  • a differential amplifier 196 is connected via the charging diode 178, which produces no output signal as long as the diode 178 is operated in the forward direction (presence of the mains voltage and charging of the accumulator 168). If the mains voltage fails, a voltage drop is obtained at the diode 178 and a signal is present at the output of the differential amplifier 196. The latter activates a frequency generator 197 and at the same time resets a counter 198, the counting terminal Z of which receives the pulse provided by the frequency generator 197. An output terminal of counter 198 of high significance is connected to the input of an inverter 180 ', the output signal of which is used via resistor 181 to control transistor 162.
  • the frequency of the frequency generator 197 and the counter 198 are selected such that the output terminal of the counter 198 connected to the inverter 180 ' becomes high after a period of approximately 12 hours. The output of inverter 180 'now drops and transistor 162 turns off. The accumulator 168 is therefore no longer discharged.
  • FIG. 13 shows a further monitoring circuit which, like the interruptions and short-circuits shown in FIG. 7, is equally able to determine in the monitoring circuit.
  • the current flowing through the resistor 131 and, in the case of a proper operative connection between the sensor and the goods, at the same time via the resistor 130 is provided on a conductor 410 by the power supply (not shown in more detail) and generates a corresponding voltage drop at an input resistor 412 of the monitoring circuit.
  • the base terminal of a transistor 418 is controlled via a high-resistance voltage divider with the resistors 414 and 416 compared to the resistor 412, a capacitor 420 being connected between the base terminal of the transistor 418 and to delay the turning on of the transistor 418 with respect to the occurrence of a voltage across the resistor 412 Earth is switched.
  • a further resistor 422 is connected into the collector-emitter path of transistor 418, which together with transistor 418 can bridge a resistor 424, which is high-resistance in comparison.
  • the latter together with a resistor 426, forms a voltage divider connected between the conductor 410 and the ground rail 428, which is connected to the negative input terminal of a differential amplifier 430 and is supplied with the voltage across the resistor 412 via a diode 432.
  • the second input terminal of the differential amplifier 430 is grounded via a resistor 434 and a reference voltage Uref is applied to it via a further resistor 436, which is lower than the supply voltage V cc ' on the conductor 410.
  • the positive input terminal of the differential amplifier 430 is connected to the amplifier output via a diode 438, so that the output signal of the amplifier 430 is self-sustaining.
  • the collector-emitter path of a further transistor 440 is connected between the network nodes lying between the resistors 434 and 436 and the conductor 410.
  • a resistor 424 connected in the conductor 410 together with a resistor 444 connected in series therewith and the resistors 131 and 412, drives the base terminal of the transistor 440, in such a way that the transistor 440 turns on when the current on the conductor 410 exceeds a predetermined threshold value, which indicates a short circuit between the conductors of the connecting cable 12.
  • the positive input terminal of the differential amplifier 430 is thus brought to the higher potential V cc on the conductor 410, so that the differential amplifier 430 switches through in any case.
  • the various voltage divider resistors are selected so that when the switch 100 is opened or the cable 12 is cut, the potential at the negative input terminal of the differential amplifier 430 drops so much that the voltage drops below the small reference voltage on the positive input and the differential amplifier 430 also switches through.
  • the transistor 418 ensures that the high-resistance resistor 424 is located between the negative input terminal of the differential amplifier 430 and the ground rail 428 instead of the low-resistance resistor 422 before the connecting cable 12 is plugged in. This terminal is thus at such a high potential that no output signal from the differential amplifier 430 is obtained.
  • FIGS. 14 to 24 lines which serve to supply power to circuits are generally distinguished from signal lines by small dashes.
  • 310 represents a supply line for a monitoring channel designated as a whole with 312. This is connected via a plug connection 314 and a cable 316 to a sensor 318, which has a switch 320 mechanically cooperating with a product to be monitored and a switch 320 connected in series for this purpose Has resistor 322.
  • a monitoring current source 324, a detector circuit 326 and an alarm unit 328 are connected to the supply line 310.
  • the latter can e.g. be a lamp while a central acoustic alarm is being driven by an output line 330 of the monitoring channel 312.
  • the monitoring current increases, as shown at time t o in FIG. 16. It is therefore not possible to remove the goods from the exhibition space without the monitoring current changing its amplitude towards smaller or larger values. These amplitude changes are detected in the detector circuit 326 and the output signal then provided triggers the alarm unit 328.
  • the detector circuit shown in FIG. 17 has a differentiating circuit 332, with the output signal of which a monostable multivibrator with the period ⁇ , the first input of an OR gate 336 and the input of an inverter 338 are applied.
  • the output of the inverter 338 is connected to a second input of the OR gate 336, and the output of the latter is connected to the one input of an AND gate 340.
  • the output signal of the flip-flop 334 sets a bistable flip-flop 344 via an inverter 324, the "1" output of which is connected to the second input of the AND gate 340.
  • the output of the latter is connected to the set terminal of a further bistable multivibrator 346, the "1" output of which provides the control signal for the alarm unit 328.
  • the pulse generated by the rising current edge at the output of the differentiating circuit 332 passes via the OR gate 336 and the AND gate 340 to the set input S of the bistable multivibrator 346, and an alarm is triggered. If the monitoring circuit is interrupted during an attempted theft, the pulse generated by the falling current edge leads to the triggering of an alarm via the inverter 338 and likewise via the OR gate 336 and the AND gate 340.
  • the detector circuit 328 shown in FIG. 18 works very similarly to the detector circuit 326 according to FIG. 17. Only the OR gate 336 and the inverter 338 are replaced by a full-wave rectifier 348, and the output of the latter is connected to the counter terminal Z of a binary counter 350. Its output terminal corresponding to the number "2" is connected to the set input of the bistable multivibrator 346.
  • the monitoring current edge connected when a cable 316 connected to a sensor 318 is inserted is masked out by the binary counter 350 and thus does not lead to an alarm. Every further change in the level of the monitoring current towards smaller or larger values leads to the further counting of the binary counter 350 to the number "2" and thus to the setting of the bistable multivibrator 346 and the triggering of an alarm.
  • FIG. 19 and the other figures circuits which have already been explained above with reference to FIGS. 14 to 18 are again provided with the same reference symbols.
  • the monitoring current source 324 simultaneously transfers a reference current to the detector circuit 326, which, when properly closed, sets the target value for the monitoring current represents monitoring route.
  • a current monitor circuit 352 is connected into the monitoring circuit, which generates a continuous output signal from the point in time at which a monitoring current has flowed through the sensor 318.
  • the detector circuit 326 in turn always provides a control signal for the alarm unit 328 if the current value of the monitoring current deviates upwards or downwards from the reference current.
  • the output signal of the current monitor circuit 352 serves to close a controllable switch 354 which is inserted into the supply line of the detector circuit 326.
  • the detector circuit 326 thus does not generate a control signal for the alarm unit 328 if the monitoring channel 312 was not already occupied when the entire monitoring system was switched on.
  • controllable switch 354 can be inserted into the reference current line which runs from the monitoring current source 324 to the detector circuit 326.
  • the detector circuit is then acted upon by a reference current signal assigned to an open circuit.
  • the current monitor circuit shown in FIG. 21 has a resistor 356 connected to the monitoring circuit and one with its input terminals via the latter connected differential amplifier 358.
  • the output of the latter is connected to the set terminal of a bistable multivibrator 360, and its "1" output controls with the interposition of an amplifier 362, the switch 354.
  • the flip-flop 360 is reset again when the entire network supply of the monitoring system is switched on for the first time.
  • the embodiment according to FIG. 22 is similar to that according to FIG. 20, but the switch 354 is not activated as a function of the monitoring current, but as a function of a separate arming current, the circuit of which is closed via a separate contact of the plug connection 314 when a cable is connected. In this embodiment, an alarm is thus triggered even if the sensor 320 has not been correctly attached to the goods, so that the switch 320 is not closed. Interruptions in cable 316 are also reliably detected.
  • a current monitor circuit 352 is provided, which can be configured in exactly the same way as the one shown in FIG. 21, but in a simplified embodiment can also have only one capacitor 364 with an associated charging resistor 366. The capacitance of the capacitor 364 is dimensioned such that the switch 354 is kept closed when the plug connection 314 is released until the detector circuit 326 has generated its alarm signal.
  • the current sinks are not shown in any more detail; it goes without saying that the various circuits are closed in a known manner via the ground rail.
  • FIG. 23 shows a monitoring channel constructed from analog switching elements, which is constructed similarly to the monitoring channel according to FIG. 22, but with the difference that the capacitor charged via the additional contact of the plug connection 314 is used directly as an emergency reference current source, which connects the detector circuit after the Disconnecting the connector 314 still holds for a sufficient period of time to generate an alarm.
  • FIG. 23 also shows the negative supply line 311.
  • the monitoring channel contains a differential amplifier 368, which provides the control signal for the alarm unit 328 and is also self-holding by a feedback diode 370.
  • the positive input terminal of the differential amplifier 368 is assigned an interference suppression circuit which comprises a resistor 372 and an interference suppression capacitor 354. If the input of the monitoring channel is not occupied, the positive input of the differential amplifier 368 is biased to a predetermined potential by two resistors 376, 378, while the negative input of the differential amplifier 368 is grounded via a resistor 380. Under these conditions, no signal is received at the output of differential amplifier 368.
  • the negative input terminal of the differential amplifier 368 is brought to a potential via the voltage divider formed by the resistor 380 and a further resistor 382, which potential is still less than the potential then prevailing at the positive input terminal of the differential amplifier 368.
  • the latter is increased compared to the working state when the input is not occupied, since resistor 322 and resistor 382 are now connected in parallel with resistor 376. No alarm is generated even under these conditions.
  • a capacitor 383 is connected across the resistor 380 and charges when the plug connection 314 is closed.
  • differential amplifier 368 If the switch 320 is opened, the cable 316 is cut or the connector 314 is disconnected, the potential at the positive input of the differential amplifier 368 quickly drops back to the value it had before the sensor was connected. The capacitor 383, however, maintains the potential at the negative input terminal at the higher value obtained after connecting the sensor. Under these conditions, differential amplifier 368 generates an output signal and then stays on the back Coupling diode 370 continues even when the capacitor 383 has discharged through the resistor 380. The time constant of the RC element formed by resistor 380 and capacitor 383 is thus selected so that differential amplifier 368 has sufficient time to control.
  • the negative input terminal of the differential amplifier 368 is connected via a Zener diode 384 and an oppositely polarized diode 386 to the contact of the plug connection 314, via which the monitoring current to the monitoring channel 312 returns.
  • the Zener diode 384 is selected with such a breakdown voltage that it still blocks when the monitoring path is in the correct state, but breaks through in the event of a short circuit between the conductors of the cable 316.
  • the negative input of the differential amplifier 368 is again at a higher potential than the positive input, since this potential is limited by a further Zener diode 388 to a predetermined value which is smaller than that in the event of a short circuit on the negative input terminal of the differential amplifier 368 potential value obtained.
  • a resistor 385 separates the diode 386 from the Zener diode 388.
  • the different resistances have the following values: With a supply voltage of 10 V between the supply lines 310 and 311, the Zener diode 384 has a breakdown voltage of 2 V, the Zener diode 388 has a breakdown voltage of 6 V.
  • FIG. 24 components which correspond in terms of function to components already explained with reference to FIG. 23 are again provided with the same reference symbols.
  • An essential difference between the embodiment according to FIG. 24 and that according to FIG. 23 is that the plug connection 314 need only have two contacts.
  • the positive end of the resistor 382 is connected directly to the supply line 310, and the capacitor 383 is now connected between the contact of the plug connection 314 that receives the monitoring current and the network nodes located between the resistors 376 and 378.
  • a further Zener diode 390 is provided in series with a discharge resistor 392 for the capacitor 383.
  • the different resistors have the following size: With a supply voltage of 10 V between the supply lines 310 and 311, the Zener diode 384 is designed for a breakdown voltage 4.5 V, the Zener diode 388 for a breakdown voltage 4.0 V and the Zener diode 390 for a breakdown voltage 3 V. .
  • a light indicator can be connected to the output of the bistable multivibrator 344 of FIG. 17 or to the least significant output of the counter 350 of FIG. 18, as indicated schematically at 345.
  • this indicator does not light up after plugging in the connecting cable of a sensor, this indicates that either the switch 320 of the sensor unit 318 is not closed (insufficient contact between sensor and goods) or there is an interruption in the connecting cable 316 or a bad contact at the plug connection 314 .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)

Claims (21)

1. Dispositif antivol pour des marchandises, comportant au moins une source de courant de contrôle, un capteur opérant en coopération avec la marchandise et branché dans le circuit de contrôle et qui, dans le cas d'un enlèvement de la marchandise, modifie le courant de contrôle, et un circuit de contrôle qui délivre un signal d'alarme lorsqu'une modification du courant de contrôle est établie, l'unité formée par le capteur et le câble de liaison entre le capteur et le circuit de contrôle prédéterminant, dans le cas d'une liaison active correcte avec la marchandise, un courant de contrôle qui est modifié, du point de vue de son amplitude et/ou de sa fréquence et/ou de sa position de phase, vers des valeurs plus élevées et plus faibles de sorte qu'aussi bien lors de la suppression de la liaison active entre le capteur et la marchandise que lors de l'établissement d'un court-circuit dans le câble de liaison, on obtient une modification de l'amplitude et/ou de la fréquence et/ou de la position de phase du courant de contrôle, caractérisé par le fait que le circuit de contrôle comporte un circuit d'activation (138 C, 142; 332, 334, 340-344; 332, 348, 350; 352, 354; 383), qui est chargé, par l'intermédiaire d'un connecteur (14; 314), par un courant de commande qui sert également à raccorder le capteur (100; 200; 318) au circuit de contrôle, de sorte que même dans le cas de la suppression de la liaison correcte entre le capteur et le circuit de contrôle, il se produit une modification de l'amplitude et/ ou de la fréquence et/ou de la position de phase du courant de contrôle, tandis que l'établissement de la liaison entre le capteur et le circuit de contrôle est possible sans le déclenchement d'une alarme.
2. Dispositif antivol suivant la revendication 1, caractérisé par le fait que le circuit d'activation contient un détecteur de flancs (332, 334; 332, 348; 356, 358) servant à déterminer les flancs dans le circuit de contrôle et un élément de mémoire (344; 346, 360) pouvant être activé par ce détecteur.
3. Dispositif antivol suivant la revendication 2, caractérisé par le fait que le détecteur de flancs contient un circuit différentiateur (332) et un circuit à bascule bistable (344; 350) branché en aval.
4. Dispositif antivol suivant la revendication 3, caractérisé par le fait que le circuit de contrôle (226) contient un redresseur double-alternance (336, 338; 348) raccordé également au circuit différentiateur (332).
5. Dispositif antivol suivant la revendication 4, caractérisé par le fait que le redresseur double-alternance comporte un circuit OU (336), dont une entrée est raccordée directement à la sortie du circuit différentiateur (332) et dont la seconde entrée est raccordée par l'intermédiaire d'un inverseur (338) à la sortie du circuit différentiateur (332).
6. Dispositif antivol suivant la revendication 4 ou 5, caractérisé par le fait que les sorties du circuit à bascule bistable (344) et du redresseur double-alternance (336, 338) sont interconnectés par l'intermédiaire d'un circuit ET (340), dont la sortie est reliée à la borne de commande d'un second circuit à bascule bistable (356), qui délivre le signal d'alarme.
7. Dispositif antivol suivant la revendication 4 ou 5, caractérisé par le fait que la sortie du redresseur double-alternance (348) est reliée à la borne de comptage (Z) d'un compteur (350) et que la sortie, associée au chiffre «2», de ce compteur est reliée à la borne de commande d'un circuit à bascule bistable (348), qui délivre le signal d'alarme.
8. Dispositif antivol suivant la revendication 2, caractérisé par le fait que le détecteur de flancs comporte une résistance (356) branchée dans le circuit de contrôle et un amplificateur (358) raccordé par l'intermédiaire de cette résistance.
9. Dispositif antivol suivant la revendication 1, caractérisé par le fait que le circuit d'activation comporte une mémoire de charge (364; 383) pouvant être chargée par le courant de commande d'activation et à partir de laquelle se trouve commandée l'application de la tension de référence et/ou de la tension de service à un comparateur (368) du circuit de contrôle.
10. Dispositif antivol suivant la revendication 9, caractérisé par le fait que la mémoire de charge (383) est raccordée directement par sa première borne à une première entrée du comparateur (368) et est reliée par l'intermédiaire d'une diode Zener (384) à la seconde entrée du comparateur (368) et que le potentiel présent sur l'une des entrées du comparateur (368) est limité par une seconde diode Zener (388).
11. Dispositif antivol suivant la revendication 1, caractérisé par le fait que le circuit d'activation comporte un interrupteur actionné de façon forcée par l'extrémité, située du côté du circuit de contrôle, du câble de liaison (12D; 226), ainsi qu'une résistance (131; 220) raccordée à cet interrupteur.
12. Dispositif antivol suivant la revendication 11, caractérisé par le fait que la résistance (131) du circuit d'activation est raccordée par l'intermédiaire des contacts, situés du côté du circuit de contrôle, du câble de liaison (12D), qui forment, en association avec les bornes d'entrée du circuit de contrôle, l'interrupteur du circuit d'activation.
13. Dispositif suivant l'une des revendications 1 à 12, caractérisé par le fait qu'un dispositif d'alimentation en courant pour le circuit de contrôle et des unités de détection comprend: un bloc d'alimentation, qui peut être relié par l'intermédiaire d'un interrupteur commandable (160) à un accumulateur (168), qui pour sa part peut être relié par l'intermédiaire d'un second interrupteur commandable (162) aux appareils d'utilisation; un premier circuit de commande (174, 176), qui ferme le premier interrupteur commandable lors la présence de la tension du réseau; et un second circuit de commande (180 à 194), qui ouvre le second interrupteur commandable (162) lorsque la tension aux bornes de l'accumulateur (168) tombe au-dessus d'une valeur prédéterminée.
14. Dispositif antivol selon la revendication 13, caractérisé par le fait que le second circuit de commande comporte un amplificateur différentiel (180), dont le signal de référence est dérivé, par l'intermédiaire d'une diode Zener (186), du signal de sortie du second interrupteur commandable (162).
15. Dispositif antivol suivant la revendication 14, caractérisé par le fait que l'entrée du signal d'un amplificateur différentiel (180) est raccordée à un noeud de réseau d'un diviseur de tension de forte valeur ohmique (182, 184), raccordé aux bornes de l'accumulateur, et, par l'intermédiaire d'une autre résistance (192), à la sortie de la partie d'alimentation réseau (158).
16. Dispositif antivol suivant l'une des revendications 1 à 12, caractérisé par le fait qu'un dispositif d'alimentation en tension pour le circuit de contrôle et pour des unités de détection comprend: un bloc d'alimentation (158) qui peut être reliée par l'intermédiaire d'un interrupteur commandable (160) et un accumulateur (168) qui, pour sa part, peut être relié par l'intermédiaire d'un second interrupteur commandable (162) aux appareils d'utilisation; un premier circuit de commande (174, 176), qui ferme le premier interrupteur commandable (160) lors de la présence de la tension au réseau, et un second circuit de commande (180' à 198) qui contient un circuit de temporisation (197, 198) qui est déclenché par un circuit de détection (178, 196) lorsque la tension sur la sortie de la partie réseau (158) chute, et délivre alors, au bout d'un intervalle de temps prédéterminé, un signal ouvrant le second interrupteur commandable (162).
17. Dispositif antivol suivant l'une des revendications 1 à 16, caractérisé par le fait que le câble de liaison (236) situé entre le capteur et le circuit de contrôle comporte, au niveau de son extrémité située du côté de la marchandise, une partie de connecteur (242) et, à distance de l'extrémité située du côté de la marchandise, une seconde partie de connecteur (240), complémentaire de la première, auquel cas les contacts (244 à 250) coopérants de ces parties de connecteurs forment un interrupteur de capteur, qui est fermé après son installation sur la marchandise, et qu'une résistance (252) de limitation du courant, qui est montée en série avec l'interrupteur du capteur, est branchée par l'intermédiaire des contacts (248, 250) de la seconde partie de connecteur (240).
18. Dispositif antivol suivant la revendication 17, caractérisé par le fait qu'une section de boucle (238) du câble de liaison (236) s'étend à travers la seconde partie de connecteur (240) et qu'au moins une ligne d'alimentation (254) de la résistance (252) montée dans la seconde partie du connecteur (240) s'étend à travers cette section de boucle (238).
19. Dispositif antivol suivant l'une des revendications 1 à 18, caractérisé par le fait que le capteur comporte un circuit série constitué par un interrupteur de capteur (100, 202, 302) actionné lors de sa mise en place sur la marchandise, et une résistance ohmique, capacitive ou inductive fixe (130; 204).
20. Dispositif antivol suivant la revendication 19, caractérisé par le fait que le circuit de contrôle comporte un amplificateur différentiel (138; 228), dont une borne est reliée à un noeud d'un diviseur de tension (130 à 132; 204; 216) et qui contient la résistance (130; 204) du capteur, et dont la seconde borne est reliée par un noeud équivalent d'un diviseur de tension de référence équivalent (140, 142; 218, 222), qui contient une résistance (140; 222) équivalente à la résistance (130; 204) du capteur. r.
21. Dispositif antivol suivant l'une des revendications 1 à 20, caractérisé par un dispositif d'affichage (345) branché par le circuit d'activation (326), servant à indiquer l'état précis du circuit de contrôle.
EP83112050A 1983-01-26 1983-12-01 Dispositif antivol Expired EP0116701B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83112050T ATE27661T1 (de) 1983-01-26 1983-12-01 Diebstahlsicherung.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19833302459 DE3302459A1 (de) 1982-05-07 1983-01-26 Diebstahlsicherung fuer ausgestellte waren
DE3302459 1983-01-26
DE19833314187 DE3314187A1 (de) 1983-04-19 1983-04-19 Diebstahlsicherung fuer waren
DE3314187 1983-04-19

Publications (2)

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EP0116701A1 EP0116701A1 (fr) 1984-08-29
EP0116701B1 true EP0116701B1 (fr) 1987-06-03

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EP (1) EP0116701B1 (fr)
DE (1) DE3371951D1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8805281U1 (fr) * 1988-04-21 1989-04-13 Zander, Hans, 4836 Herzebrock, De
FR2625581A1 (fr) * 1988-01-05 1989-07-07 Jaeger Detecteur de bris de glace pour vehicules automobiles
DE9001828U1 (fr) * 1990-02-16 1990-05-10 Ott, Reinhold, 7000 Stuttgart, De
DE9201087U1 (fr) * 1992-01-30 1992-06-17 Zander, Hans, 4836 Herzebrock, De
EP0494715A1 (fr) * 1991-01-11 1992-07-15 Jacob Smit Système antivol
DE4203304A1 (de) * 1991-02-02 1992-08-20 Roman A Dipl Ing George Alarmanlage mit fremdspannungssteckern zur versorgung und sicherung elektrisch betriebener geraete
EP1093743A2 (fr) 1999-10-22 2001-04-25 Reinhold Ott Dispositif pour protéger un article contre le vol
US6278365B1 (en) 1995-05-16 2001-08-21 Protex International Corp. Security system with intermittent alarm location detection
DE19655316B4 (de) * 1996-03-28 2005-10-20 Reinhold Ott Zentraleinheit für eine Anlage zur Sicherung von Waren gegen Diebstahl
DE202009015635U1 (de) * 2009-11-24 2011-04-14 Zander, Oliver Sicherungsadapter zum Sichern kompakter Ausstellungsstücke mit geringerem Platzangebot

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DE19528178C2 (de) * 1995-08-01 1997-05-28 M S E Gmbh Überwachungssystem
DE19612374C5 (de) * 1996-03-28 2006-03-16 Reinhold Waterloo Ott Zentraleinheit für eine Anlage zur Sicherung von Waren gegen Diebstahl
DE19655081C5 (de) * 1996-03-28 2010-11-04 Reinhold Waterloo Ott Zentraleinheit für eine Anlage zur Sicherung von Waren gegen Diebstahl
DE19808252A1 (de) * 1998-02-27 1999-09-09 Ott Zentraleinheit für eine Anlage zur Sicherung von Waren gegen Diebstahl
FR2832245B1 (fr) 2001-11-13 2006-03-17 Saaa Systemes D Automatismes D Dispositif de securite filaire pour la detection du vol d'un objet a proteger et procede de fonctionnement
US9082057B2 (en) * 2009-08-19 2015-07-14 Intelleflex Corporation RF device with tamper detection
CN113825335B (zh) * 2021-09-10 2022-05-24 扬州中宏电力科技有限公司 一种基于物联网的远程防盗变压器整流器

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US3253270A (en) * 1963-08-02 1966-05-24 Downer Frank Theft alarm for shoplift prevention
US3444547A (en) * 1965-10-08 1969-05-13 Gefco Mfg Corp Anti-shoplifting device
US3440636A (en) * 1966-01-11 1969-04-22 Michael T Sliman Sensing resistance device
GB1389009A (en) * 1971-05-04 1975-04-03 Emi Ltd Theft alarm systems
AU6649874A (en) * 1973-03-14 1975-09-11 Steven Grant Marshall Alarm system
DE2854434C2 (de) * 1978-12-16 1983-11-24 Burkhard 4052 Korschenbroich Zülow Diebstahlsicherungseinrichtung für insbesondere Verkaufsgegenstände
DE3302459A1 (de) * 1982-05-07 1983-11-10 Reinhold 7000 Stuttgart Ott Diebstahlsicherung fuer ausgestellte waren

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2625581A1 (fr) * 1988-01-05 1989-07-07 Jaeger Detecteur de bris de glace pour vehicules automobiles
DE8805281U1 (fr) * 1988-04-21 1989-04-13 Zander, Hans, 4836 Herzebrock, De
DE9001828U1 (fr) * 1990-02-16 1990-05-10 Ott, Reinhold, 7000 Stuttgart, De
EP0494715A1 (fr) * 1991-01-11 1992-07-15 Jacob Smit Système antivol
DE4203304A1 (de) * 1991-02-02 1992-08-20 Roman A Dipl Ing George Alarmanlage mit fremdspannungssteckern zur versorgung und sicherung elektrisch betriebener geraete
DE9201087U1 (fr) * 1992-01-30 1992-06-17 Zander, Hans, 4836 Herzebrock, De
US6278365B1 (en) 1995-05-16 2001-08-21 Protex International Corp. Security system with intermittent alarm location detection
DE19655316B4 (de) * 1996-03-28 2005-10-20 Reinhold Ott Zentraleinheit für eine Anlage zur Sicherung von Waren gegen Diebstahl
DE19655316C5 (de) * 1996-03-28 2013-01-31 Ott Security Systems Inc. Zentraleinheit für eine Anlage zur Sicherung von Waren gegen Diebstahl
EP1093743A2 (fr) 1999-10-22 2001-04-25 Reinhold Ott Dispositif pour protéger un article contre le vol
DE202009015635U1 (de) * 2009-11-24 2011-04-14 Zander, Oliver Sicherungsadapter zum Sichern kompakter Ausstellungsstücke mit geringerem Platzangebot

Also Published As

Publication number Publication date
DE3371951D1 (en) 1987-07-09
EP0116701A1 (fr) 1984-08-29

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