EP0014009B1 - Security fence - Google Patents

Security fence Download PDF

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Publication number
EP0014009B1
EP0014009B1 EP80200028A EP80200028A EP0014009B1 EP 0014009 B1 EP0014009 B1 EP 0014009B1 EP 80200028 A EP80200028 A EP 80200028A EP 80200028 A EP80200028 A EP 80200028A EP 0014009 B1 EP0014009 B1 EP 0014009B1
Authority
EP
European Patent Office
Prior art keywords
fence
switch
wire
detector
chambers
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
EP80200028A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0014009A1 (en
Inventor
Gabriel Dewaegheneire
Leo Anrijs
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.)
Bekaert NV SA
Original Assignee
Bekaert NV SA
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 Bekaert NV SA filed Critical Bekaert NV SA
Priority to AT80200028T priority Critical patent/ATE2163T1/de
Publication of EP0014009A1 publication Critical patent/EP0014009A1/en
Application granted granted Critical
Publication of EP0014009B1 publication Critical patent/EP0014009B1/en
Expired 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
    • 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

Definitions

  • the invention relates to a security fence of the kind including a tensioned wire connected to a detector for sensing movement of the wire.
  • a security fence and detector are described in United States Patent No. 3.634.638.
  • the detector disclosed in the prior art just mentioned reacts to sudden movement of the wire, but not to slow movements as for example those arising from temperature changes.
  • This has so far necessitated a complicated arrangement of the detector, which comprises a pin-shaped contact mounted within an annular contact.
  • the pin contact In mounting such a detector one must be careful that in the rest position the pin contact is substantially in the centre of the annular contact so that its sensitivity is equal in all directions. Otherwise the sensitivity of the switch in one direction will be much greater than in another direction so that minor disturbances which are not intended to be sensed will cause actuation of the alarm system.
  • Another disadvantage of this known detector is that its operation is based on the properties of a particular silicone paste, which forms the medium through which the movements of an element connected to the fencing wire are transmitted to a switch element, in such manner that sudden movements are transmitted but slow ones are not.
  • the properties of this paste depend upon temperature so that the detector is undesirably sensitive to weather (summer compared with winter) and time (day compared with night).
  • such detectors are relatively expensive.
  • a security fence including a tensioned wire connected to a detector for sensing movement of the wire, the detector comprising a movable element which sealingly separates two chambers in such a manner that any movement of the sealing element produces a change in volume of at least one of the chambers, which one chamber is connected to a pressure-sensitive switch actuator.
  • the detector comprises an air cylinder with a piston which constitutes the said sealing element and is connected to the said wire.
  • the switch actuator comprises a movable membrane dividing a housing into two compartments, each compartment being connected to atmosphere via a restricted aperture, said membrane carrying a movable contact of a switch.
  • the spacing between the switch contacts is adjustable, and that the size of the said restricted apertures is adjustable.
  • a fencing comprising a plurality of said tensioned wires extending substantially horizontally and each connected to a said detector, the corresponding chambers of a plurality of said detectors are preferably connected in parallel to a common switch actuator.
  • Figure 1 shows part of a security fence.
  • This fence comprises, inter alia, switch-carrying posts 1 and tensioned fencing wires 2. Ordinary posts may be placed between the switch-carrying posts 1.
  • the fencing wires may be of the type described in Dutch patent application No. 76.10670 (open to public inspection on 29th March 1978, Dutch Patent Office) and may be woven into a netting or be horizontally tensioned.
  • the fencing wires may alternatively be normal fencing wires such as for example barbed wire. In the illustrated embodiment, horizontally tensioned wires 2 are used.
  • FIG 2 shows a switch-carrying post 1 equipped with the elements necessary to detect sudden movements of the horizontally tensioned wires 2, but which are not sensitive to slow movements.
  • This post 1 comprises two sections 3 and 4, which fit together in a sealing manner. Moving away section 4 from section 3 will actuate the safety switch 5 will then sound an alarm. This means that it is not possible to sabotage the operation of the elements within the post without raising the alarm via the switch 5.
  • the horizontally tensioned wires 2 extend via apertures through the section 3 of the post 1.
  • the post 1 is provided with a number of detectors in the form of air cylinders 6 whose number equals the numbers of tensioned wires 2.
  • air cylinders 6 are commercially available, for example Martonair type M/6010-M/6020. These air cylinders are double-acting cylinders with a chamber at each side of the piston 7.
  • Each cylinder 6 is fixed to the section 3 of the post 1, and the rod 8 of the piston 7 is fixed to a respective wire 2.
  • the cylinders 6 have for example a bore diameter of 10-20 mm and a length of stroke of 50 mm.
  • Figure 3 is a schematic view of how the cylinders 6 are connected with each other and with two air-pressure-sensitive switch actuators 9 and 10.
  • the cylinders 6 are connected in parallel by means of pipes 11.
  • Ports 12a, 12b and 13a, 13b are connected to the lower and upper actuators 9 and 10 respectively, via connections 12 and 13.
  • the actuators 9 and 10 which are available on the market, for example type DW 10 of Bircher, Shaffhausen, Switzer- land, convert a low-pressure air signal into an electrical signal.
  • They are in open position with their switch contacts 14, 15 located at a small distance from each other.
  • the required control pressure can be adjusted by placing the contacts 14, 15 closer to or further away from each other and this can be done by adjusting the contact 15 which has the form of a control screw.
  • the contact 14 is supported by a membrane 16 which divides the switch into two compartments. Each compartment is provided with a small adjusting screw 17 which determines the size of a restricted aperture to atmosphere. The size of the restricted aperture can be changed by moving this adjusting screw 17, whose function will be clarified hereafter.
  • This sensitivity allows the switch to react to very slight sudden movements of the piston 7 and the wire 2 connected to it.
  • the switch opens again since the air escapes through restricted aperture. In other words, to close the switch and thus to actuate the alarm an air pulse is necessary, caused by the movement of the piston by means of the wire.
  • the switch never stays for long in the closed or alarm position. After having actuated the alarm the switch automatically returns to its condition of rest and then immediately reacts again to a next sudden movement of the piston.
  • the sensitivity of the installation is great, but does not depend on the position of the piston.
  • the piston when first secured to a certain wire 2 is substantially in the centre of the cylinder, then the piston has over 20 mm of free stroke in both directions.
  • the wire 2 shows an elongation or shrinkage of 10 mm in a given direction, for example when retensioning a wire, and the piston is returned to the condition of rest, then such a transposition of the piston has no influence at all on the good operation or the sensitivity of the system.
  • Any small sudden movement of the piston for example of 3 mm, is immediately sensed since the piston still has a free stroke of over 10 mm in one direction and over 30 mm in the others.
  • the sensitivity of the system is very great; it has been found that the switch 9 or 10 may be closed simply by squeezing one of the pipes 11 suddenly.
  • the sensitivity of the system is easily adjustable by means of the regulating screws 17 and the adjusting screws 15.
  • the invention at least in its illustrated embodiment provides a security fence of particularly simple and inexpensive design and high reliability in operation, which moreover can be built up from commercially available standard elements.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Forging (AREA)
  • Control Of Combustion (AREA)
  • Fencing (AREA)
  • Materials For Medical Uses (AREA)
EP80200028A 1979-01-30 1980-01-14 Security fence Expired EP0014009B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80200028T ATE2163T1 (de) 1979-01-30 1980-01-14 Sicherheitszaun.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7900735 1979-01-30
NL7900735A NL7900735A (nl) 1979-01-30 1979-01-30 Beveiligde afrastering.

Publications (2)

Publication Number Publication Date
EP0014009A1 EP0014009A1 (en) 1980-08-06
EP0014009B1 true EP0014009B1 (en) 1982-12-29

Family

ID=19832549

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80200028A Expired EP0014009B1 (en) 1979-01-30 1980-01-14 Security fence

Country Status (11)

Country Link
EP (1) EP0014009B1 (da)
JP (1) JPS55123797A (da)
AT (1) ATE2163T1 (da)
BE (1) BE881393A (da)
BR (1) BR8000555A (da)
DE (1) DE3061454D1 (da)
DK (1) DK34780A (da)
GB (1) GB2041609B (da)
NL (1) NL7900735A (da)
NO (1) NO800184L (da)
ZA (1) ZA80197B (da)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3012389A1 (de) * 1980-03-29 1981-10-08 Schulz Electronic GmbH, 3101 Hambühren Zaunartige absperrvorrichtung
DE3211647A1 (de) * 1982-03-30 1983-10-06 Schulz Celler Drahtwaren Zur signalausloesung dienende einrichtung an zaeunen oder dergleichen
IL70087A (en) * 1983-10-30 1988-06-30 Israel Aircraft Ind Ltd Taut wire fence system
GB2164183A (en) * 1984-08-17 1986-03-12 Alan John Pepper Intruder detecting fences
GB2243933B (en) * 1990-05-11 1994-03-02 Autoliv Dev Improvements in or relating to a collision sensor
FR2820865B1 (fr) * 2001-02-09 2003-04-18 Serpe Iesm Soc D Etudes Et De Dispositif detecteur d'intrusion pour cloture
GB2409085B (en) * 2003-12-11 2006-06-28 John Mcrae Perimeter wall security systems
ES2374464B1 (es) * 2009-07-16 2012-10-19 Representaciones Tecnológicas Para Obras Públicas S.L. Perfeccionamientos en el objeto de la patente n. p 200900175 por: dispositivo para la detección de caída de elementos.
CN110160772B (zh) * 2019-06-27 2024-04-19 李文斌 一种螺栓失效检测装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR344983A (fr) * 1904-07-20 1904-11-18 Hermann Erndt Avertisseur pour barrières en fil de fer
DE1959229C3 (de) * 1968-07-19 1978-12-21 Israel Aircraft Industries, Ltd., Lod Airport (Israel) Durch plötzliche Bewegung eines äußeren Glieds betätigbarer elektrischer Schalter mit einem fließfähigen Material
FR2296890A1 (fr) * 1975-01-06 1976-07-30 Desneux Bernard Declencheur d'alarme a double effet

Also Published As

Publication number Publication date
GB2041609A (en) 1980-09-10
NL7900735A (nl) 1980-08-01
BR8000555A (pt) 1980-10-21
GB2041609B (en) 1982-12-22
ZA80197B (en) 1980-12-31
NO800184L (no) 1980-07-31
JPS55123797A (en) 1980-09-24
DK34780A (da) 1980-07-31
DE3061454D1 (en) 1983-02-03
EP0014009A1 (en) 1980-08-06
BE881393A (nl) 1980-07-29
ATE2163T1 (de) 1983-01-15

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