CA1188554A - Guard fence - Google Patents
Guard fenceInfo
- Publication number
- CA1188554A CA1188554A CA000407346A CA407346A CA1188554A CA 1188554 A CA1188554 A CA 1188554A CA 000407346 A CA000407346 A CA 000407346A CA 407346 A CA407346 A CA 407346A CA 1188554 A CA1188554 A CA 1188554A
- Authority
- CA
- Canada
- Prior art keywords
- plastics
- wire
- guard fence
- netting
- coating
- 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
Links
- 239000004033 plastic Substances 0.000 claims abstract description 29
- 229920003023 plastic Polymers 0.000 claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 230000011664 signaling Effects 0.000 claims abstract description 7
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 238000004381 surface treatment Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000001465 metallisation Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000009941 weaving Methods 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims 1
- 238000000034 method Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 235000002020 sage Nutrition 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
- G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires
- G08B13/122—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a perimeter fence
Abstract
ABSTRACT OF THE DISCLOSURE A guard fence for intrusion detection and alarm signalling. The fence includes at least one plastic-coated metal wire which in-cludes a conductive strand in combination with the metal wire core.
Description
The present invention`relates to a thiefproof guard fence consisting of plastics-coated wire netting and intended for ensuring detection and signalling to a central watch-post, of any attempt by an intruder to break ln or get 5 over.
Thiefproof fence networ~s are already known. They employ wire netting specially desvgned for this purpase and incorporating a spec~al conductor wire having the ordinary outer a~pearance of the othex wire~ of the netting. This f 10 type of netting presents the disadvantage of bein~ very costly. For these devices the alarm is triggerea by measurement of the unbalance caused between two identical panels insei^ted in a Wheatstone bridge circuit.
This method of connection enables compensation of variations 15 in resistance due to atmospheric conditions but it presents the disadvantage of being too sensitive and being triggered for other causes than a break-in (the fa~ling of a balloon, closeness of objects causing interference~..... ~ and of creating false alarms.
The aim of the invention is to provide a fence which of~ers ver~ hiyh protection wh:ilst employiny standard wire netting.
In acordance with the invention thi~s result is obtained with a guard fence for detection and alarm signalling consisting of a plastics-coated wire netting stretched between posts and means of detection and signalling of any attempt to break in, characterized in that the said wire netting is of standard type having a welded mesh, over which before coating with plastics, conductive strands of enamelled or varnishedicopper are woven to form one or more conductive loops.
~,,~' The conductive line or lines thus formed are closed across a supply circuit and across a detection circuit which enables any breakage or modificat~on o~ ~he conductive lines of the netting due to an attempt at shunting to be dekected.
The present lnvention in addition offers complete impossibility of the return o~.information or of interference through earth and thus avoids the risk of false alarms.
. .
An essential advantage of this device is its low cost thanks to the employment of standard commercial welded netting hav1.ng-a rectangular mesh. In addition, after plastics coating of the whole,the outer appearance of the netting i`s absolutely ordinary and the presence of the conductor wires cannot be detected by a possible intruder.
The i.nvention is explained in greater-detail below by means ,' . 15 of certain of its embodiments, taken by way~illustration but in no way restrictively, whilst referring to the attached drawings in which: .
-- Figure 1 represents a conductive loop PUt in place on the supporting netting in accordance with the invention;
~ Figure 2 is a section of the cable composing the netting after- covering with plastics the whole as Figure 1, Figure 3 illustrates by way of example a way of fencing in an enclosure in accordance with the invention;
. .
- Figure 4 is a diagram of the preferred electronic detection circuit;
- Figure 5 is a synoptic of the circuit as Figure 4;
- Figure 6 is a schematic diagram of the alarm transmission and centralization circuit;
- Figure 7 is a special barbed wire which ma~ be employed in combination wlth the invention;
Figure 8 is a diagrammat~c longitudinal section of a conductor element employed in accordance with a variant lrnplementation;
Figure 9 illustrates the reali~ation of a conductive circuit on plast~c-coated netting by a surface treabment;
(: .
Figure 10 illustrates a part~cularly advantageous application of the fence as in Figure 9.
In accordance with Figure 1 -the wire ~etting serving as support is of the type having a welded rectangular mesh.
A plurality of strands of enamelled and varnished copper twisted together i9 put into place so as to form by weaving along-the horizontal and then vertical stee~ cables a long continuous loop the two ends A and A' of which meet at one and the same(;point on the netting. The said strands are held along the steel cables by stitching by sewing machine or by stapling or gluing.. The whole is t~en coated with plastics and aPpears like a normal plastics-coated welded netking.
Figure 2 represents, seen in section, the cable obtained after ooating the whole as Figure 1 wi~h plastics. The steel core l as well as the plurality of strands of cop~er ~ are embedded in the plastics coating 3.
Hence the protection of a sensitive point, of a factory or a site, will be achieved by a fence consisting of members of wire netting placed on concrete posts or plastics-coated metal posts, and several metres wide. The said members which may be partially or totally sunk in the ground in order to incxease~ the security, form sections or zones of some tens to some h~tndreds of metres if necessctry~ protected ~4-specifically and independently ln accordance with the plan as Figure 3. Each zone in turn consists of one or more looPs identical with the loop A-A~ as Figure 1~ In accordance with the preferred embodiment of -the invention each loop ~-A' in turn consists o~ a plurallty of conductive strands of copper, each then,forming a conductive loop. In accordance wlth one variant embodlmen-k, the conductive strand (or,strands) forming the loop A-A' may be replaced by a layer of conductive p'aint or a layer of metallization ' . 10 or any other means o realization oE the conductive loop, the said layer being de~osited betwe:~n ~wo layers of plastics coating. Each conductive loop.of each zone is connected across an electronic equipment fed either from -the local supply clrcuit or preferably from a solar panel feeding a battery by way of a transistor regulator. This PreEerred method of supply has the advantage vf saving the laying of electric supply lines, of keeping the battery permanently charged, of being largely independent and of being insulated from earth.
Fi.~ure 4 represents by way of example a circuit for inter-rogation of a zone including 8 loops or 8 electrical circuits and able~suit a :fence of a maximum length oE 250m. In the case of fences of greater length it is advisablë to provide this device as many times as is necessary. The princip~e oE operation of the interrogation circuit is descri~ed .in the synoptic chart as Figure 5 and in Figure 4.
It comprises a clock (4) controlling the successive excitation of the portions of the eight registers Ql, Q2, Q3, Q4, Q5, Q6, Q7, Q8 of the unit (5~.
Ea,ch output Ql, Q2, Q3, Q4, Q~, ~6, Q7, Q8 is connected to one o:E the eight inputs to the interface unit t5~. This unit comprises eight elec,tronic circuits each comprising one loop of the fence circuit. Each output from the interface circù~t: (63 is connected to one input to the eight gates of the comparator unit (7)O There exists in addition a direct connection between each output from the register and the second input to each gate of the unit (7).
Thus when the output Ql sends the signal the gate 1 receives two identical signals over its two inputs and its output remains at rest. If the loop being interrogated is broken its impedence is seen to be modified by a shunt, the gate tilts and communicates a voltage to the alarm circuit~
The portions of fence are thus interrogated in succession during an interval of time less than one second~ Th,e circuit comprises in addi~ion a device for resetting the clock to zero when the eight loops have been interrogated so as -to reco~mence the interrogation.
In the event that a shunt had been put ln place by an intruder and connected two loops together, for example, the loop 1 and the loop 8, only one of the two gates ~ or 8 would have both its inputs in the same state since the clock sends only one signal at a time and the other gate then triggers the alarm.
The synoptic as Figure 5 represents the detection circuit described above.
Figure 6 represents the schematic diagram of the alarm transmission and centralization cîrcuit. This circuit offers the advantage of effecting the connection between the central station situated in the guard post and the assoclated substations at each zone of the fence by means of a single wire; the economy and the ease of laying are not negligible in the case of fences of large dimensions.
`
6~
A constant current at a regulated,voltage flows in -the said connecting wire which is also called the busline.
.
The said busline comprises as much resistance R as there are zones to be supervised, each resistance R being in-stalled in paraliel across a closing contact whi~h in thenormal position is closed. At the t~me of an alarm or of a fault in the supply to the substation the corresponding relay d~o~s out and its resistallce is in circuit.
( i .
The analogue-digital convertor sees its values compared cyclically by the central station with a table of values put in store.
Wnlen the value from the convertor is equal to a stored value (in the event of alarm) the central unit converts the said value into a zone number which is then dealt with by the various signalling circuits indicated in Figure 6:
dlsplay, printer, synoptic, audible alarm, alarm report, telephone transmitter, ...... and may be employed either separately or partially or totally combined.
In addition the stored table comprises an instruction corresponding with cutting the wire o the busline.
By way of example a RC~ card equiPped with a "cosmac"
~icroprocessor (ref. CD P 185604) and a card from the same manufacturer (refO CD P 183648) are employed ~or the A/D conversion. The capacity of this conversion, 8 bits multiplexed over 16 lines, enables the system to centralize if necessary on the same principler other alanms such as:
supervision of the burners i~ the boiler room~
te,mperature of the buildings, or any other industrial application.
.
This method of kransmission and centrallzation has been described in a non-restrictive way, and one may con-ceive of employing any other method of transmission (low ~requency or the like..~.).
In addition the electronic device may be comPleted by a circuit for compensation of temperature by thermis~ance in order to take into accoun~ variations in the ohmic resistance of the wires of the netting as a function of ( , the external temperature (-20 to + 50).
In addition, in accordance with a variant upon the invention,.
one may conceive of employing instead of the plastics-coated netting or in combination with it one or more barbed wires stretched between the posts. Th:is special harbed wire is composed of a plastics-coated metal wire (9~
of the same:.structure as the cable described in Figure 2 and twisted with a steel wire car~ying barbs (10).
A variant implementation will now be described by reference to Figure 8.
A wire treated in accordance with this vari.ant includes.
- a central me-tal core ~11); , an insulating layer (12), for example,a layer of plastics;
- a conductive layer (13) applied by surface treatment, for example, by metallization;
- an outer insulating layer (14).
Hence the conductive element is applied by a surface treatment directly over the plastics sheath coating the central core,,the whole being subsequently su~jected to another coating with plastics or any other suitable lnsulating material~
Thus on a plastics~coa~ed wire netting one may achieve a veritable printed circuit, the application of the surface treatment being able to be selective and defining conductive circuits which are then fed and supervis0d in the same manner as previouslyO
Th~ surface treatment may be, non-restrictively, a metalli~
zation in accordance with techniques which in themselves are well known and will not be described ln greater detail.
In Figure 9 an embodiment is shown of circuits printed over a plastics-coated wire netting (15).
The surface treatrnent is applied selectively so as to define circuits such as (16, 17, 18). Then insulation is effected eithex hy coating with plastics or by spraying with any adequate insulating constituent.
Finally in Figure 10 there is shown a supplementary securlty d~vice which detects any break-in tending to ma]ce the upper portion of the nettiny tilt.
On the connecting posts (19`20) the d~namometric detection members are arranged, which consist essentially o~ two symmetrical bars (21,22) mounted to be able to rotate about a point on the posts and controlling inside each post a means of pinching the fence wires, thus triggering the alarm; the means of pinching are e~uipped with a return spring which brlngs them back into position when the action upon them ceases.
Finally barbed wires are stretched across the bars (21,22), projecting sideways with respect to the plane of the netting and including a conductive strand produced likewise by metallization.
Thus a complete protection is obtained:
- detectlon via the netting for breakage and any deterior-- ation;
- dynamometric detection via the bars on the connecting posts, detection for brea]sage and deter~oratio~ of the barbed ~ires.
(
Thiefproof fence networ~s are already known. They employ wire netting specially desvgned for this purpase and incorporating a spec~al conductor wire having the ordinary outer a~pearance of the othex wire~ of the netting. This f 10 type of netting presents the disadvantage of bein~ very costly. For these devices the alarm is triggerea by measurement of the unbalance caused between two identical panels insei^ted in a Wheatstone bridge circuit.
This method of connection enables compensation of variations 15 in resistance due to atmospheric conditions but it presents the disadvantage of being too sensitive and being triggered for other causes than a break-in (the fa~ling of a balloon, closeness of objects causing interference~..... ~ and of creating false alarms.
The aim of the invention is to provide a fence which of~ers ver~ hiyh protection wh:ilst employiny standard wire netting.
In acordance with the invention thi~s result is obtained with a guard fence for detection and alarm signalling consisting of a plastics-coated wire netting stretched between posts and means of detection and signalling of any attempt to break in, characterized in that the said wire netting is of standard type having a welded mesh, over which before coating with plastics, conductive strands of enamelled or varnishedicopper are woven to form one or more conductive loops.
~,,~' The conductive line or lines thus formed are closed across a supply circuit and across a detection circuit which enables any breakage or modificat~on o~ ~he conductive lines of the netting due to an attempt at shunting to be dekected.
The present lnvention in addition offers complete impossibility of the return o~.information or of interference through earth and thus avoids the risk of false alarms.
. .
An essential advantage of this device is its low cost thanks to the employment of standard commercial welded netting hav1.ng-a rectangular mesh. In addition, after plastics coating of the whole,the outer appearance of the netting i`s absolutely ordinary and the presence of the conductor wires cannot be detected by a possible intruder.
The i.nvention is explained in greater-detail below by means ,' . 15 of certain of its embodiments, taken by way~illustration but in no way restrictively, whilst referring to the attached drawings in which: .
-- Figure 1 represents a conductive loop PUt in place on the supporting netting in accordance with the invention;
~ Figure 2 is a section of the cable composing the netting after- covering with plastics the whole as Figure 1, Figure 3 illustrates by way of example a way of fencing in an enclosure in accordance with the invention;
. .
- Figure 4 is a diagram of the preferred electronic detection circuit;
- Figure 5 is a synoptic of the circuit as Figure 4;
- Figure 6 is a schematic diagram of the alarm transmission and centralization circuit;
- Figure 7 is a special barbed wire which ma~ be employed in combination wlth the invention;
Figure 8 is a diagrammat~c longitudinal section of a conductor element employed in accordance with a variant lrnplementation;
Figure 9 illustrates the reali~ation of a conductive circuit on plast~c-coated netting by a surface treabment;
(: .
Figure 10 illustrates a part~cularly advantageous application of the fence as in Figure 9.
In accordance with Figure 1 -the wire ~etting serving as support is of the type having a welded rectangular mesh.
A plurality of strands of enamelled and varnished copper twisted together i9 put into place so as to form by weaving along-the horizontal and then vertical stee~ cables a long continuous loop the two ends A and A' of which meet at one and the same(;point on the netting. The said strands are held along the steel cables by stitching by sewing machine or by stapling or gluing.. The whole is t~en coated with plastics and aPpears like a normal plastics-coated welded netking.
Figure 2 represents, seen in section, the cable obtained after ooating the whole as Figure 1 wi~h plastics. The steel core l as well as the plurality of strands of cop~er ~ are embedded in the plastics coating 3.
Hence the protection of a sensitive point, of a factory or a site, will be achieved by a fence consisting of members of wire netting placed on concrete posts or plastics-coated metal posts, and several metres wide. The said members which may be partially or totally sunk in the ground in order to incxease~ the security, form sections or zones of some tens to some h~tndreds of metres if necessctry~ protected ~4-specifically and independently ln accordance with the plan as Figure 3. Each zone in turn consists of one or more looPs identical with the loop A-A~ as Figure 1~ In accordance with the preferred embodiment of -the invention each loop ~-A' in turn consists o~ a plurallty of conductive strands of copper, each then,forming a conductive loop. In accordance wlth one variant embodlmen-k, the conductive strand (or,strands) forming the loop A-A' may be replaced by a layer of conductive p'aint or a layer of metallization ' . 10 or any other means o realization oE the conductive loop, the said layer being de~osited betwe:~n ~wo layers of plastics coating. Each conductive loop.of each zone is connected across an electronic equipment fed either from -the local supply clrcuit or preferably from a solar panel feeding a battery by way of a transistor regulator. This PreEerred method of supply has the advantage vf saving the laying of electric supply lines, of keeping the battery permanently charged, of being largely independent and of being insulated from earth.
Fi.~ure 4 represents by way of example a circuit for inter-rogation of a zone including 8 loops or 8 electrical circuits and able~suit a :fence of a maximum length oE 250m. In the case of fences of greater length it is advisablë to provide this device as many times as is necessary. The princip~e oE operation of the interrogation circuit is descri~ed .in the synoptic chart as Figure 5 and in Figure 4.
It comprises a clock (4) controlling the successive excitation of the portions of the eight registers Ql, Q2, Q3, Q4, Q5, Q6, Q7, Q8 of the unit (5~.
Ea,ch output Ql, Q2, Q3, Q4, Q~, ~6, Q7, Q8 is connected to one o:E the eight inputs to the interface unit t5~. This unit comprises eight elec,tronic circuits each comprising one loop of the fence circuit. Each output from the interface circù~t: (63 is connected to one input to the eight gates of the comparator unit (7)O There exists in addition a direct connection between each output from the register and the second input to each gate of the unit (7).
Thus when the output Ql sends the signal the gate 1 receives two identical signals over its two inputs and its output remains at rest. If the loop being interrogated is broken its impedence is seen to be modified by a shunt, the gate tilts and communicates a voltage to the alarm circuit~
The portions of fence are thus interrogated in succession during an interval of time less than one second~ Th,e circuit comprises in addi~ion a device for resetting the clock to zero when the eight loops have been interrogated so as -to reco~mence the interrogation.
In the event that a shunt had been put ln place by an intruder and connected two loops together, for example, the loop 1 and the loop 8, only one of the two gates ~ or 8 would have both its inputs in the same state since the clock sends only one signal at a time and the other gate then triggers the alarm.
The synoptic as Figure 5 represents the detection circuit described above.
Figure 6 represents the schematic diagram of the alarm transmission and centralization cîrcuit. This circuit offers the advantage of effecting the connection between the central station situated in the guard post and the assoclated substations at each zone of the fence by means of a single wire; the economy and the ease of laying are not negligible in the case of fences of large dimensions.
`
6~
A constant current at a regulated,voltage flows in -the said connecting wire which is also called the busline.
.
The said busline comprises as much resistance R as there are zones to be supervised, each resistance R being in-stalled in paraliel across a closing contact whi~h in thenormal position is closed. At the t~me of an alarm or of a fault in the supply to the substation the corresponding relay d~o~s out and its resistallce is in circuit.
( i .
The analogue-digital convertor sees its values compared cyclically by the central station with a table of values put in store.
Wnlen the value from the convertor is equal to a stored value (in the event of alarm) the central unit converts the said value into a zone number which is then dealt with by the various signalling circuits indicated in Figure 6:
dlsplay, printer, synoptic, audible alarm, alarm report, telephone transmitter, ...... and may be employed either separately or partially or totally combined.
In addition the stored table comprises an instruction corresponding with cutting the wire o the busline.
By way of example a RC~ card equiPped with a "cosmac"
~icroprocessor (ref. CD P 185604) and a card from the same manufacturer (refO CD P 183648) are employed ~or the A/D conversion. The capacity of this conversion, 8 bits multiplexed over 16 lines, enables the system to centralize if necessary on the same principler other alanms such as:
supervision of the burners i~ the boiler room~
te,mperature of the buildings, or any other industrial application.
.
This method of kransmission and centrallzation has been described in a non-restrictive way, and one may con-ceive of employing any other method of transmission (low ~requency or the like..~.).
In addition the electronic device may be comPleted by a circuit for compensation of temperature by thermis~ance in order to take into accoun~ variations in the ohmic resistance of the wires of the netting as a function of ( , the external temperature (-20 to + 50).
In addition, in accordance with a variant upon the invention,.
one may conceive of employing instead of the plastics-coated netting or in combination with it one or more barbed wires stretched between the posts. Th:is special harbed wire is composed of a plastics-coated metal wire (9~
of the same:.structure as the cable described in Figure 2 and twisted with a steel wire car~ying barbs (10).
A variant implementation will now be described by reference to Figure 8.
A wire treated in accordance with this vari.ant includes.
- a central me-tal core ~11); , an insulating layer (12), for example,a layer of plastics;
- a conductive layer (13) applied by surface treatment, for example, by metallization;
- an outer insulating layer (14).
Hence the conductive element is applied by a surface treatment directly over the plastics sheath coating the central core,,the whole being subsequently su~jected to another coating with plastics or any other suitable lnsulating material~
Thus on a plastics~coa~ed wire netting one may achieve a veritable printed circuit, the application of the surface treatment being able to be selective and defining conductive circuits which are then fed and supervis0d in the same manner as previouslyO
Th~ surface treatment may be, non-restrictively, a metalli~
zation in accordance with techniques which in themselves are well known and will not be described ln greater detail.
In Figure 9 an embodiment is shown of circuits printed over a plastics-coated wire netting (15).
The surface treatrnent is applied selectively so as to define circuits such as (16, 17, 18). Then insulation is effected eithex hy coating with plastics or by spraying with any adequate insulating constituent.
Finally in Figure 10 there is shown a supplementary securlty d~vice which detects any break-in tending to ma]ce the upper portion of the nettiny tilt.
On the connecting posts (19`20) the d~namometric detection members are arranged, which consist essentially o~ two symmetrical bars (21,22) mounted to be able to rotate about a point on the posts and controlling inside each post a means of pinching the fence wires, thus triggering the alarm; the means of pinching are e~uipped with a return spring which brlngs them back into position when the action upon them ceases.
Finally barbed wires are stretched across the bars (21,22), projecting sideways with respect to the plane of the netting and including a conductive strand produced likewise by metallization.
Thus a complete protection is obtained:
- detectlon via the netting for breakage and any deterior-- ation;
- dynamometric detection via the bars on the connecting posts, detection for brea]sage and deter~oratio~ of the barbed ~ires.
(
Claims (6)
1. A guard fence for detection and alarm signalling of the type comprising at least one plastics-coated metal wire stretched between posts and means of detection and signalling of any attempt to break in, before coating with plastics the conductive strand being combined with a metal core of the said plastics-coated wire, the wire being in the form of plastics-coated wire netting, which is obtained by the association and plastics coating of on the one hand a standard welded netting having a rectangular mesh, and on the other a continuous loop obtained by weaving along the steel cables a plurality of strands of enamelled or varnished copper.
2. A guard fence as claimed in claim 1, characteri-zed in that the plastics-coated metal wire is twisted with a steel wire carrying barbs.
3. A guard fence as in claim 1, characterized in that the conductive element is applied by surface treatment directly over the plastics sheath coating the central core, the whole being subsequently subjected to another coating with plastics or any suitable insulating material.
4. A guard fence as in claim 3, characterized in that the conductive element is applied by metallization.
5. A guard fence as in claim 1, characterized in that it includes a dynamometric detection in the upper portion of the netting, including essentially bars mounted to pivot about the connecting posts and operating inside them means of pinching a fence wire.
6. A guard fence as shown in claim 1, characterized in that in addition it includes, stretched between the bars, barbed wires including a conductive element applied by surface treatment over the plastics sheath coating the central core of one of the wires of the said barbed wire.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8115074A FR2510786A1 (en) | 1981-07-31 | 1981-07-31 | Security fence using plastics coated metal wire - has conductor for signalling intrusion combined with plastic coating |
| FR81/15074 | 1981-07-31 | ||
| FR81/19287 | 1981-10-12 | ||
| FR8119287A FR2514534A2 (en) | 1981-10-12 | 1981-10-12 | Security fence with associated alarm circuit - has alarm conductor formed by metallisation of plastics-coated fence wire or mesh |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1188554A true CA1188554A (en) | 1985-06-11 |
Family
ID=26222495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000407346A Expired CA1188554A (en) | 1981-07-31 | 1982-07-15 | Guard fence |
Country Status (6)
| Country | Link |
|---|---|
| CA (1) | CA1188554A (en) |
| DE (1) | DE3209869A1 (en) |
| ES (1) | ES514242A0 (en) |
| GB (1) | GB2105505A (en) |
| IT (1) | IT1151939B (en) |
| LU (1) | LU84305A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL70087A (en) * | 1983-10-30 | 1988-06-30 | Israel Aircraft Ind Ltd | Taut wire fence system |
| DE3628956C2 (en) * | 1986-06-03 | 1995-04-20 | Poley Bernd | Barrier fence |
| GB2259722A (en) * | 1991-09-20 | 1993-03-24 | Cochrane Steel Prod Pty Ltd | Security fencing |
| GB2311156A (en) * | 1996-03-11 | 1997-09-17 | Anthony Walter Peloe | Alarmed wire mesh fencing |
| CN103985463A (en) * | 2014-05-26 | 2014-08-13 | 四川九洲线缆有限责任公司 | High-strength special winding wire |
| CN113775194A (en) * | 2021-08-06 | 2021-12-10 | 上海建工一建集团有限公司 | Monitoring circuit and intelligent guardrail pole setting |
-
1982
- 1982-03-18 DE DE3209869A patent/DE3209869A1/en not_active Withdrawn
- 1982-07-14 GB GB08220434A patent/GB2105505A/en not_active Withdrawn
- 1982-07-15 CA CA000407346A patent/CA1188554A/en not_active Expired
- 1982-07-22 ES ES514242A patent/ES514242A0/en active Granted
- 1982-07-22 IT IT22517/82A patent/IT1151939B/en active
- 1982-07-29 LU LU84305A patent/LU84305A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ES8309021A1 (en) | 1983-10-01 |
| ES514242A0 (en) | 1983-10-01 |
| DE3209869A1 (en) | 1983-02-17 |
| GB2105505A (en) | 1983-03-23 |
| LU84305A1 (en) | 1983-02-07 |
| IT1151939B (en) | 1986-12-24 |
| IT8222517A1 (en) | 1984-01-22 |
| IT8222517A0 (en) | 1982-07-22 |
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Effective date: 20020715 |