EP0427559A2 - Système de sécurité pour charge - Google Patents

Système de sécurité pour charge Download PDF

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Publication number
EP0427559A2
EP0427559A2 EP90312276A EP90312276A EP0427559A2 EP 0427559 A2 EP0427559 A2 EP 0427559A2 EP 90312276 A EP90312276 A EP 90312276A EP 90312276 A EP90312276 A EP 90312276A EP 0427559 A2 EP0427559 A2 EP 0427559A2
Authority
EP
European Patent Office
Prior art keywords
security system
load
platform
alarm
vehicle
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.)
Withdrawn
Application number
EP90312276A
Other languages
German (de)
English (en)
Other versions
EP0427559A3 (en
Inventor
Barry Alfred Morgan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TRANSALARM Ltd
Original Assignee
TRANSALARM Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by TRANSALARM Ltd filed Critical TRANSALARM Ltd
Publication of EP0427559A2 publication Critical patent/EP0427559A2/fr
Publication of EP0427559A3 publication Critical patent/EP0427559A3/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/22—Status alarms responsive to presence or absence of persons
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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
    • G08B13/1472—Mechanical actuation by lifting or attempted removal of hand-portable articles with force or weight detection

Definitions

  • the present invention relates generally to security systems, and in particular to a load security system.
  • Immediate detection of a theft or attempted theft not only has the beneficial effect of preventing that theft from taking place, but also has a more general deterrent effect on would be thieves who, in the knowledge that constant monitoring is being effected, will not attempt a crime.
  • Shoplifting for example, is greatly reduced by the installation of electromagnetic tags and induction loop sensors at the doorways to the premises.
  • detection means are inappropriate, for example when the valuables subject to theft are too small to be tagged, for example jewellery, or where other circumstances prevent such techniques, for example when transferring bank notes or other valuables by vehicle from a bank or retail premises.
  • Security is achieved in the latter situation by the use of secure vehicles, for which purpose a number of specialist carriers have developed techniques and equipment for maintaining security in such transactions.
  • Known secure vehicles have three isolated compartments, namely an armoured vault at the rear of the vehicle, the driver's compartment, which is locked, and an operator or passenger compartment usually at the front of the vehicle to one side of the driver's compartment.
  • the routine for transferring bank notes or other valuables to the vehicle then, involves the driver remaining in position in the locked driver's cab to which would-be thieves cannot gain access except by damaging the vehicle.
  • the vault operator who is locked in the vault, is provided with a secure hatch having a door at each end with a mechanism which allows only one to be open at a time, and the operator or passenger leaves the vehicle to carry the valuables from the premises to the hatch and then, having successfully transferred the valuables into the vault rejoins the vehicle by re-entering the part of the cab allocated for his transport and the vehicle continues on its round or journey.
  • the transfer operator (or operators since there may be, in some circumstances, more than one of them) is relatively less secure because he has to leave the vehicle and enter the premises from which the valuables are being transferred. It is usual to break down a valuable load into smaller units which are individually transferred from the secure location in the premises to the vault so that the transfer operator is at no time carrying a bag or other container of sufficient value to warrant direct attack on him whilst effecting the transfer. The accumulated contents of the security vehicle may nevertheless become vulnerable to attack if the vehicle can be transported to a suitable concealed location.
  • the load platform may be provided with appropriate sensors capable of providing an alarm indication as soon as the vehicle is unloaded by a predetermined amount, suitable hysteresis being included in the system to prevent short term weight fluctuations, such as would be due to irregularities in the road during motion, from triggering the alarm system.
  • the weight sensor will be energised by a suitable switch which may be directly or remotely operated, for example by means of radio waves or other transmissions the proximity of a source of which indicates the proximity of an authorised person.
  • a suitable switch which may be directly or remotely operated, for example by means of radio waves or other transmissions the proximity of a source of which indicates the proximity of an authorised person.
  • an unobtrusive monitoring system can be put into operation by utilising a weight sensor which will immediately produce an alarm indication if the weight on a jewellery tray changes by an amount sufficient to imply removal or attempted removal of even one of the items from the tray, which would be inhibited by the signals transmitted from a device carried by an authorised person.
  • a security system for ensuring that a platform is correctly loaded comprises weight sensor means sensitive to the laden weight of the platform when a preliminary check load is placed on it, storage means for storing a value corresponding to the correct load, and comparison means connected to the said weight sensor means and to the said storage means and operative, when energised, to provide an alarm signal if the weight sensed upon energisation does not lie within a predetermined range of the said preliminary check loading thereof.
  • the check loading can be easily achieved by means of an "update" switch operated by a key available only to authorised personnel so that the correct weight on a platform can be changed from time to time.
  • the present invention provides means for ensuring that the vehicle is not driven without the correct load, comprising means sensitive to the applied load on the platform operative to produce a signal representative thereof, means for storing data representing the correct load on the platform, means for comparing signals representing the instantaneous load on the platform and the stored load signal, and an alarm system triggered by a sensor which detects if the vehicle is put in motion when the output from the comparison means represents substantial inequality in the two compared signals.
  • the vehicle security system is further provided with means for re­setting the said storage means to a new authorised load weight.
  • re-setting means preferably has an associated timer inhibiting its operation for a predetermined time interval after each operation.
  • time interval may, for example, be in the region of twenty-four hours so that each security van can be set to the weight of its operator or operators at the beginning of the day, and this weight reading will remain in effect for the whole of the working day until the van returns.
  • the van can be driven only when the correct operator is in place. Should the operator not return to the van it cannot be driven without triggering the alarm and should another person enter the operator's position either in place of the correct operator or in addition to the correct operator, the alarm system will again be triggered as soon as an attempt is made to drive the vehicle.
  • authorised timer override means to allow the resetting means to be operating within the said predetermined time interval. This is necessary, for example, to accommodate unexpected, but not criminal, eventualities such as the operator being taken sick or otherwise being unable to continue with a days work during the middle of the day, which eventuality would otherwise disable the van for the rest of the day.
  • the override means would involve the use of keys available only to authorised personnel.
  • the said resetting means may include means for generating a digital control signal and a memory for storing the digital control signal between successive resetting operations thereof.
  • the said means for generating a digital control signal may comprise a counter supplied with a digital signal from a clock, means for providing a digital weight signal representing the load on the platform during the resetting operation, comparator means for comparing the digital weight signal with the digital output signal from the counter, and means for inhibiting the clock when coincidence of the two signal values is detected.
  • the said counter also preferably serves as the said storage means, providing a digital output signal representing the digital value counted at the time coincidence was detected with the platform load upon setting.
  • the output signal from the counter is, in a preferred embodiment, supplied to a further comparator which also receives a signal representing the instantaneous load on the platform.
  • alarm inhibit means preventing operation of the alarm unless the vehicle is put in motion. This allows the passenger or operator to leave the vehicle and return to it when stationery without triggering the alarm, but results in an alarm indication occurring if the vehicle is driven off before the operator returns to load the platform appropriately with his own weight.
  • the alarm indication means also preferably includes means for inhibiting the operation of the vehicle, such as an engine cut out mechanism, preventing the vehicle from being moved whilst the alarm condition persists.
  • the alarm inhibit means conveniently comprises a switch linked to the vehicle clutched pedal so that the alarm is armed as soon as the clutch pedal is depressed. Although armed the alarm signal would not be triggered unless there is a suitable load differential between the memorised and the instantaneous load on the platform. Furthermore, a suitable time delay before the alarm indication is given after triggering thereof is preferably built into the system so that it is clear to those who may have caused the alarm that the situation is entirely out of the control of the operator. This is intended to prevent spontaneous josals on the van operating staff which are both unjustified and ineffective.
  • Means may also be provided to set more than one authorised weight in the memory, for example to allow different combinations of personnel to be carried.
  • a security vehicle is generally indicated with the reference numeral 11, and is separated, in a known way, into a secure vault 12 comprising the main load-carrying compartment of the vehicle, a driver's compartment 13 and a passenger or operator's compartment 14.
  • the vault 12 is armour-plated and provided with a twin door hatch 15 of the "air lock" type having doors at each end interlinked in such a way that only one can be open at any one time.
  • the driver's compartment 13 is in communication with the vault 12 by radio, but otherwise the vault 12 is locked and has no communication with the outside world.
  • the operator's compartment 14 is separated from the driver's compartment by a dividing wall 16 and the operator has a door 17 by means of which he can enter and leave the vehicle unobstructed.
  • the floor of the operator's compartment 14 is provided with a load platform 18 mounted on four strain gauge sensors 19, 20, 21, 22 closing spaced to the floor and connected to a sensing circuit the details of which are described in relation to Figure 2.
  • the output from the sensing circuit leads to a vehicle ignition cut off switch (not shown) and to an alarm siren or other audible warning device (again not shown) both of which are protected by armour plating to prevent interference with the alarm indication and vehicle disablement which takes place when an alarm event is detected.
  • the basic principles of the invention which allow a new weight on the load platform to be memorised for each given working period, comprises the four strain gauge sensors 19, 20, 21, 22 which, as can be seen from the inset in Figure 2, are formed each as two metal film sensors identified with the reference numerals A and B on opposite sides of a flexible beam 23 and connected in a bridge configuration which is adjustable by means of the variable resistor 24.
  • a differential amplifier 25 is connected across the bridge circuit with its non-inverting input being connected via an integrator comprising a resistor 26 and capacitor 27 to the tapping of the variable resistor 24, and the inverting input being fed via a variable resistor 28 which acts to set the weight range which is to be detected by the device.
  • the integrator comprising the resistor 26 and capacitor 27 introduces a degree of hysteresis in the operation of the differential amplifier 25 so that transient loads such as by the operator jumping onto the platform when returning to the vehicle will not cause triggering.
  • the output from the differential amplifier 25 is further integrated via a resistor 29 and capacitor 30 before being supplied to the non-inverting input of a buffer amplifier 31 the output of which is fed back to the inverting input and connected via an adjustable resistor 32 to the non-inverting input of a further differential amplifier 33 which acts as a comparator in a manner which will be described hereinbelow and to the inverting and non-inverting inputs of two further differential amplifiers 34, 35 (the latter via an adjustable resistor 36 for reasons which will be described in more detail below) which act as discriminators.
  • the initial load setting operation is performed by a circuit comprising a differential amplifier 37 the output from which is supplied to the inverting and non-inverting inputs of the discriminator amplifiers 34, 35 respectively, and to the inverting input of the comparator 33, a digital-to-analogue converter 38, a digital counter 39, and a clock oscillator 43 the output from which is fed to the counter 39 and which is controlled by a clock stop signal on a line 44 supplied from the output of the comparator 33.
  • a reset control 41 is provided, which when triggered starts the counter 39 so as to count pulses generated by the clock 43.
  • the output from the counter 39 is supplied to the digital-to-analogue converter 38 which, energised by the reference voltage source 40 provides a varying analogue output signal to the differential amplifier 37 the output from which feeds the comparator 33 and discriminators 34 and 35.
  • the comparator 33 also receives an input voltage via the adjustable resistor 32 the analogue value of which varies in dependence on the loading on the platform which affects balance of the bridge circuit comprising the strain gauges 19-22.
  • the strain gauges are placed one above and one below a flexible beam and electrically connected in opposite limbs of the bridge circuit so that, as can be seen by the reference numerals, the upper strain gauge 19a is in one limb whilst the lower strain gauge 19b of the same pair is in the opposite limb whereby to maximise the unbalancing effect of a compressive force on one strain gauge, which is matched by a tensile force of equal and opposite magnitude on the other strain gauge.
  • the clock 43 is stopped when the inputs to the comparator 33 bear a predetermined relationship to one another so that the counter 39 contains a count representing the value of the load applied to the platform at the time the setting operation is performed.
  • the outputs of the discriminators 34, 35 are supplied via diodes 45, 46 fed to a Schmidt trigger 47 which is triggered when the output from either the discriminator 34 or that from 35 exceeds a predetermined value.
  • the output from the Schmidt trigger 47 is fed on a line 48 as the alarm triggering signal to appropriate audible alarm circuits and/or to vehicle disabling means.
  • the discriminators 34, 35 are driven by a constant current source 49 the configuration of which is not illustrated in detail in Figure 2.
  • the load-setting operation can only be performed by resetting the counter 39 by means of the reset control 41, which latter may be provided with restricted access means, lock and key, secret access codes and the like, to ensure that this task can only be performed by authorised personnel, or as shown in Figure 2, may be operated remotely via a radio control unit 42.
  • the circuit of Figure 3 includes light emitting diodes 50, 51 the former connected to a 10 volt power supply and operating to provide a green light output when the alarm is not triggered, and the latter emitting red light when the output from the Schmidt trigger 47 goes high, to provide an alarm indication.
  • the alarm output is not armed, however, unless a clutch switch 52 is closed to discharge a capacitor 53 and initiate charging of a capacitor 54 which causes a Schmidt trigger 55 to fire (when the voltage has risen high enough) thereby causing transistor 56 to conduct disabling the ignition circuit which is connected to terminal 57.
  • This circuit operates in a slightly different manner to determine the correct weight on the load platform.
  • the operator or operators who are to be carried in the operator compartment of the vehicle stand on the platform to cause the strain gauge bridge circuit to generate, through the amplifier 25, and the buffer 31, an input to the comparator 33.
  • a reset button 57 is depressed causing a trigger 58 to go low, re-setting the alarm circuit (if it had already been triggered) and, via the Schmidt trigger 59, clamping the output from the comparator 33 to prevent any alarm indication from being given whilst the setting operation is in progress.
  • the digital-to-analogue converter 38 and counter 39 of Figure 2 are replaced by two counters 39A and 39B the former of which receives clock signals on its input from the clock oscillator 43 and the latter of which receives input signals on its clock line from the most significant digit line 61 via resistors 62 from the counter 39A.
  • the outputs from the counters 39A, 39B are supplied in pairs to an array of exclusive NOR gate circuits 63 which are gated via AND gate circuits 64 to a final output AND gate 65.
  • This circuit operates to detect coincidence of the output signal values from the two counters 39A, 39B which, as will be appreciated, are connected so that the counter 39B counts one pulse each time the counter 39A is cycled through its whole count range.
  • the AND gate 65 produces a "high" output which is fed via a diode 66 to a centre biased Schmidt trigger 67 which also receives the output from line 61 representing the most significant digit counted by the counter 39A.
  • the trigger 67 thus is periodically turned on by the output "high” signal from the AND gate 65 and, a predetermined time later, turned off by the output signal from line 61.
  • the outputs from the discriminators 34, 35 are both high so that the output from the inverter 47 is low resulting in illumination of the green diode 50.
  • the capacitor 53 is charged to maintain the output of inverter 74 low so that output of trigger 55 is high and output of trigger 75 is low.
  • the bridge becomes unbalanced and the discriminator 35 therefore goes low causing the output from inverter 47 to go high forward biasing the diode 51 and turning off by reverse biasing the green light emitting diode 50.
  • the transistor 56 remains held in its non-conducting state, however, until the clutch pedal switch 52 is depressed discharging the capacitor 53 and allowing the inverter 74 to produce a high output to switch on the transistor and apply an alarm signal to the output terminal 57.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Burglar Alarm Systems (AREA)
EP19900312276 1989-11-10 1990-11-09 A load security system Withdrawn EP0427559A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB898925452A GB8925452D0 (en) 1989-11-10 1989-11-10 A load security system
GB8925452 1989-11-10

Publications (2)

Publication Number Publication Date
EP0427559A2 true EP0427559A2 (fr) 1991-05-15
EP0427559A3 EP0427559A3 (en) 1992-03-18

Family

ID=10666091

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900312276 Withdrawn EP0427559A3 (en) 1989-11-10 1990-11-09 A load security system

Country Status (4)

Country Link
EP (1) EP0427559A3 (fr)
AU (1) AU6596890A (fr)
CA (1) CA2029634A1 (fr)
GB (1) GB8925452D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0826567A3 (fr) * 1996-08-27 1999-04-28 Robert Bosch Gmbh Dispositif de surveillance de l'intérieur d'un conteneur de transport
CN105480143A (zh) * 2015-07-03 2016-04-13 上海时焦实业发展有限公司 一种应用于汽车的动态智能监控载重报警装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA874217B (en) * 1986-06-13 1988-03-30 Kenneth W Bullivant Anti-theft product rack and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0826567A3 (fr) * 1996-08-27 1999-04-28 Robert Bosch Gmbh Dispositif de surveillance de l'intérieur d'un conteneur de transport
CN105480143A (zh) * 2015-07-03 2016-04-13 上海时焦实业发展有限公司 一种应用于汽车的动态智能监控载重报警装置

Also Published As

Publication number Publication date
GB8925452D0 (en) 1989-12-28
EP0427559A3 (en) 1992-03-18
AU6596890A (en) 1991-05-16
CA2029634A1 (fr) 1991-05-11

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