FR2878997A1 - Intrusion detection system installing method for e.g. building, involves retracting portion of cable/sleeve assembly across orifice into cover for protecting portion, where portion is not fixed on circumference of casement or frame - Google Patents

Abstract

The method involves fixing one portion of a cable/sleeve assembly on a circumference of a casement or a frame, while another portion is not fixed on the circumference of the casement or the frame. The latter portion is introduced across an orifice and is retracted across the orifice into a cover for protecting the latter portion. The orifice traverses the casement from outside towards inside of a location. An independent claim is also included for an intrusion detection system.

Description

The present invention relates to a method for installing a control system

  intrusion detection, and a system adapted for this method.

  Systems equipped with cables for detecting a force or pressure exerted on this cable are known. Known systems include an adjustable detector connected to one end of the cable. This detector is able to react in response to a variation of an electrical quantity of the cable. Typically, this detector is set according to the length of the cable.

  However, no method of installing such a system on the periphery of a leaf or a frame of an opening to detect an intrusion through this opening is known.

  The invention aims to remedy this gap by proposing a method of installing such a system on the periphery of a leaf or a frame of an opening.

  The subject of the invention is therefore a method for installing such a detection system, this method comprising: a step of fixing only a portion of the cable around the periphery of the leaf or the frame, a remaining portion of the cable not being fixed on the periphery of the leaf or the frame, - a step of retracting the remaining portion of the cable inside a protective shelter of the remaining portion.

  Thanks to the installation method above, it is not necessary to cut the cable to adjust its length according to the size of the opening. It is therefore not necessary to adjust the detector setting to the length of the cable when installing this detection system around an opening.

  Embodiments of this method may include one or more of the following features: - a step of winding the remaining portion of the cable around a coil inside the protective shelter, - a step of moving a sensor for tensioning the remaining portion of the cable within the protective shelter; - a step of providing a through-hole between the interior and exterior of the room for retracting the remaining portion through this port to the Inside the room, the interior of the room forming said protective shelter, the step of providing a through hole 15 is adapted to provide the orifice on an axis of symmetry of the opening.

  the remaining portion to retract is at least 10 cm long.

  The invention also relates to an intrusion detection system through an opening adapted to be installed in accordance with the method above. This system comprises.

  at least one transducer cable capable of transforming a force exerted on this cable into a measurable electrical quantity, a portion of this cable being intended to be fixed around the periphery of the leaf or the frame and a remaining portion of the cable not being intended to be fixed on the periphery of the leaf or the frame, - a winding mechanism suitable for winding the remaining portion of the cable around a coil.

  The invention will be better understood on reading the description which will follow, given solely by way of example and with reference to the drawings, in which: FIG. 1 is a schematic illustration of the architecture of a control system. FIG. 2 is a perspective illustration of a winding mechanism used in the system of FIG. 1; FIG. 3 is a perspective illustration of a frame on which is installed the system of FIG. FIG. 4 is a horizontal sectional view of the frame of FIG. 3; FIG. 5 is a flowchart of a method for installing the system of FIG. 1; FIGS. a perspective illustration of another method of installing an intrusion detection system around a leaf or a frame, and FIG. 8 is a flowchart of a method of installation. of the system of Figure 7.

  Figure 1 shows an intrusion detection system through an opening equipped with a frame and a leaf. This system is designated by the general reference 2.

  The system 2 comprises two cable assemblies / sheath 6, 8. Here, these sets 6 and 8 are, for example, identical and only the assembly 6 will be described in detail.

  The assembly 6 comprises a coaxial cable 10 (shown in dotted lines) housed inside a sleeve 12.

  The cable 10 forms a transducer capable of transforming a force exerted on its outer periphery into a variation of a measurable electrical quantity. More specifically, here, the cable 10 transforms the force exerted on its outer periphery into a capacity variation 2878997 4 of a capacitor. The cable 10 extends over the entire length of the sheath 12.

  A cross-section of the cable 10 is shown in FIG. 4. The cable 10 comprises a conductive central core 20 surrounded by a conductive electromagnetic shield 22. The core 20 and the shield 22 extend over the entire length of the cable 10.

  The core 20 is electrically insulated from the shield 22 in particular by a layer 24 of dielectric material. The dielectric material is chosen to have a hardness of between 30 and 80 on the Shore A scale. Indeed, a hardness greater than 80 reduces the sensitivity of the cable 10 and a hardness of less than 30 does not allow to arrange the cable 10 along an angle with a small radius of curvature while maintaining the core 20 sufficiently removed from the shielding 22.

  The material forming the layer 24 is chosen from the family of rubbers or elastomers so that its deformation is only elastic. Under these conditions, after being deformed, the cable 10 returns to its original position without any permanent deformation persists. Thus, the cable 10 can be used to detect several intrusion attempts.

  The layer 24 of dielectric material extends continuously along the core 20 so that the linear capacitance of the cable varies continuously, and preferably uniformly, as a function of the length of the cable.

  The cable 10 also comprises a protective sheath 26 surrounding the shield 22. This sheath 26 is preferably made of the same dielectric material as that of the layer 24.

  In such a cable, the core 20 and the shield 22 each form one of the plates of a capacitor whose capacitance varies when a force is exerted on the outer periphery of this cable.

  The sleeve 12 is made of a rubber or elastomer material having a hardness, preferably less than or equal to that of the dielectric material of the layer 24, so as not to decrease the sensitivity of the cable 10 in response to a force exerted on the outer surface of the sheath 12.

  Here the sleeve 12 performs the function of fixing the cable support 10 on the leaf or the frame. For this purpose, the sleeve 12 has an adhesive face 30 intended to be glued on the leaf or the frame (see Figure 3).

  Finally, the sleeve 12 is also adapted to form a seal and a thermal insulation seal when the opening is closed. For this, the sheath 12 has teeth 32 projecting on a face opposite to the adhesive face 30. These protruding teeth are intended to seal between the leaf and the frame when the leaf bears on the frame.

  The assembly 6 also has a free end 40 and an end 42 electrically connected to a detector 46 adapted to activate a warning unit 48 in the event of detection of an intrusion.

  For installation on the periphery of an access door to a house or a room, the length of the assembly 6 between these two ends 40 and 42 is, for example, equal to 255cm. This length of the assembly 6 is schematically divided into two portions 50 and 52. The portion 50 is intended to be fixed on the periphery of a leaf or a frame while conversely, the portion 52 is intended not to be fixed on this leaf or this frame. The length of the portions 50 and 52 is a function of the size of the opening and is therefore not known before the installation of the system 2 on this opening. This variable length of the portion 50 thus makes it easy to adapt the system 2 to different opening sizes.

  FIG. 2 represents a schematic and partial view of the inside of the detector 46. The detector 46 comprises a housing 60 within which is housed a capacitance sensor or capacitor 62 capable of measuring the capacitance between the core 20 and the The capacimeter 62 is electrically connected to the end of the core 20 and the shield 22 of the assemblies 6 and 8. Here, the capacitance meter 62 comprises an inductance connected in parallel with the cable 10, so as to form with it. Here is an LC resonant circuit (inductance - capacitance). The oscillation frequency of such an LC circuit is a function of the value of the capacitance of the cable and the value of the inductance.

  The value of the inductor is fixed and chosen according to the length of the cable 10. In addition, in the detector 46, high and low thresholds of capacitance are set according to the capacity of the cable 10 at rest, it is that is, when no force is exerted on its outer periphery. The crossing of these thresholds is used by the detector 46 to detect an intrusion and / or a deterioration of the cable 10. The value of these thresholds depends on the length of the cable 10.

  Inside the housing 60 is provided a housing 64 adapted to receive the remaining portion 52 of the assembly 6. For this purpose, this housing 64 has two openings 66 and 68 adapted to receive respectively sliding portions 52 of the assemblies 6 and 8.

  A mechanism 70 for winding the remaining portions 52 is installed inside the housing 64. This mechanism 70 comprises, for example, a winding spool 72, rotatably mounted on a support 74. This spool 72 is rotated for example, using a crank 76.

  The warning unit 48 is, for example, formed of a buzzer and / or indicator lights.

  Figure 3 illustrates the installation of the system 2 on the opening of a building or a room, such as, for example, a door 80 entry into a room. The door 80 opens here to the interior of the room.

  The door 80 is rotatably mounted about an axis 82 on a frame 84 using hinges 86.

  The frame 84 has two vertical uprights 84A and 84B arranged symmetrically with respect to an axis of symmetry 88. In their upper parts, the uprights are connected to each other by a horizontal portion 84C. The hinges 86 are integral with the amount 54A to the right of the axis 88.

  The assemblies 6 and 8 are here fixed symmetrically with respect to the axis 88 on the frame 84. To be effective, at least one of the sets 6 or 8 must extend over more than 60% of the part of the perimeter of the frame or leaf farthest from the axis of rotation 82. For example, the assembly 6 extends over the entire height of the vertical upright 84B and on a half 84C 'of the horizontal portion 84C to left of the axis 88. In addition, the assembly 6 is arranged to sealingly seal the entire space between the frame and the door 80, when the door is closed.

  Here, the assembly 6 is fixed on a surface 90 (Figure 4) of a projecting portion of the frame 84 forming a bearing surface for the door 80. This projecting portion is also known as the jack.

  In order to be able to install the detector 46, inside the room on a surface inaccessible from the outside, the system 2 comprises a through opening 92 passing through the frame 84 from the outside of the room towards the interior of the room . The orifice 92 is formed in the portion 84C of the frame and on the axis 88.

  The position of the detector 46 inside the room is shown in dashed lines in FIG. 3. Typically, the detector 40 is fixed on the upright 84C of the frame 84, so as to obstruct the part of the orifice 92 opening to the inside the premises.

  A method of installing the system 2 will now be described with reference to FIG.

  Initially, the orifice 92 is formed, during a step 100, in the frame 84 on the axis of symmetry 88.

  Then, the assembly 6 is fixed, during a step 102, on the bearing surface 90 of the frame 84. More specifically, the assembly 6 is bonded using the adhesive face 30 on the surface of support 90 along the perimeter of the frame 84. The step 102 is carried out starting from the lower end of the upright 84B and progressing along the frame to the orifice 92. The part thus fixed on the surface of the frame support 90 corresponds to portion 50 of the assembly 6.

  Thus, at the end of this step 102, the portion 50 is fixed around the frame 84, while the remaining portion 52 is not.

  The portion 52 of the assembly 6 which has not been fixed is then introduced through the orifice 92 and then retracted, during a step 104, through this orifice inside the room. The interior of the room here forms a protective shelter of the remaining portion since this interior is difficult to access to a person trying to break into this room.

  Steps 102 and 104 are then reiterated to fix the assembly 8 on the part of the perimeter of the frame 84 to the right of the axis 88.

  The ends of the cables 10 of the assemblies 6 and 8 are electrically connected, in a step 106, to the capacimeter 62 of the detector 46. Then, the remaining portion 52 of the assemblies 6 and 8 is wound, during a step 108, around of the coil 72 by operating the crank 76.

  When the remaining portion 52 has been wound inside the housing 64, the housing 60 is then hooked, during a step 110, inside the room at a location chosen to obstruct the opening portion of the orifice 92 .

  Once the system 2 is installed, it can be activated. When the system 2 is activated, and a burglar attempts to force the door 80 with a crowbar, chisel or other tool, it is supported on the junction between the door 80 and the frame 84 and thus exerts a force on the outer periphery of the cable 10. This force modifies the capacitance of the cable 10, which is detected by the detector 46 which, if an alarm threshold is crossed, activates the unit warning 48.

  The installation method of FIG. 5 makes it possible to adjust the length of the portion 50 as a function of the size of the opening without having to cut the cable 10. It is therefore not necessary to modify the setting of the detector 46. during installation.

  Since the orifice 92 is on the axis of symmetry 88, the assemblies 6 and 8 have the same length, which facilitates the manufacture of the system 2.

  Many other embodiments of the system and process are possible. In particular, in the embodiment of FIG. 6, the assemblies 6 and 8 are fixed along the outer periphery of the wing rather than around the frame. In this Figure 6, the orifice 92 is formed in the leaf and the detector is fixed on the leaf.

  The system 2 has been described here in the particular case where the force exerted on the cable 10 is detected by means of a capacimeter. Such a force can also be detected by means of a resistance sensor, since by exerting a sufficient force on the outer periphery of the cable 10, it is possible to create a short circuit between the core 20 and the shielding. 22.

  The system and method described herein can also be installed on other types of opening than doors. For example, the system and method of installation can be used on a window of a room or on a door of a safe.

  The system 2 comprises a winding mechanism 70 to facilitate the retraction of the remaining portion 52.

  However, alternatively, the housing 64 is devoid of such a mechanism so that the remaining portion 52 must be manually introduced into the housing 64.

  In another embodiment illustrated in FIG. 7, the detector 46 has no housing 64 adapted to receive the remaining portion 52. In FIG. 7, the elements already described with reference to FIGS. 1 to 4 bear the same references.

  The installation method (FIG. 8) of the system of FIG. 7 differs from the method of FIG. 5 in that step 108 of winding the remaining portion 52 is replaced by a step 120 of moving the detector 46 to stretch the remaining portion inside the room. In this embodiment, the detector 46 has no housing 64 or winding mechanism.

  The system 2 has been described in the case where it comprises an orifice 92 formed in the frame or the leaf. However, if the clearance between the top of the leaf and the horizontal part of the frame is large enough to pass without friction the assemblies 6 and 8, then it is not necessary to provide an opening in the leaf or the frame. It is also possible to provide more than one orifice. For example, two through holes are formed in the horizontal portion of the frame respectively to the right and left of the axis of symmetry 88. The first hole is exclusively reserved for the passage of the assembly 6, while the other hole is exclusively reserved for the passage of the assembly 8.

  In a variant, the detector 46 may also be adapted to detect the opening of the building by means of an independent opening detection system independent of the system 2.

  In FIG. 7, the detector 46 is displaced vertically along the axis of symmetry of the opening.

  However, in the case where the detector 46 also performs the opening detection function, this detector will preferably be moved horizontally along the horizontal portion of the frame to stretch the remaining portion inside the room. Indeed, under these conditions, the detector remains close to the frame and the door, which facilitates the implementation of the opening detection function.

  The system 2 and the installation method have been described in the particular case where the protective shelter of the remaining portion 52 is formed by the interior of the room.

  Alternatively, the housing 64 is formed inside a housing independent of the detector 46. This housing is attached to the outside of the room and made of a material difficult to fracture to make inaccessible to a burglar the remaining portion of the cable 10 The detector is, for its part, fixed, for example, inside the room.

  An orifice provided through the frame or the flapper makes it possible to electrically connect the end of the remaining portion retracted into the housing to the detector located inside the room.

  Finally, the process steps of FIGS. 5 and 8 can be performed in a different order. For example, step 100 is, alternatively, performed between step 104 and 106.

Claims (7)

  1. Method for installing an intrusion detection system through an opening equipped with a frame and a leaf, this system comprising at least one transducer cable capable of transforming a force exerted on this cable in a measurable electrical quantity, characterized in that the method comprises: - a step (102) for fixing only a portion of the cable around the periphery of the leaf or the frame, a remaining portion of the cable not being fixed on the around the leaf or the frame, a step (104) of retracting the remaining portion of the cable inside a protective shelter of the remaining portion.   2. Method according to claim 1, characterized in that it comprises a step (108) of winding the remaining portion of the cable around a coil inside the protective shelter.   3. Method according to claim 1, for a system comprising a detector connected to one end of the cable, this detector being able to detect an intrusion in response to a variation of the measurable electrical quantity, characterized in that the method comprises a step ( 120) of moving the detector to tension the remaining portion of the cable within the protective shelter.   4. Method according to any one of the preceding claims for an opening placed between the inside and the outside of a room, characterized in that it comprises a step (100) of providing a through hole between the inside. and the outside of the room to retract the remaining portion through this hole inside the room, the inside of the room forming said protective shelter.   5. Method according to claim 4, characterized in that the step (100) of providing a through hole is adapted to provide the orifice on an axis of symmetry of the opening.   6. Method according to any one of the preceding claims, characterized in that the remaining portion to retract is at least 10cm long.   7. Intrusion detection system through an access opening inside a room equipped with a frame and a leaf, this system being adapted to be installed according to a compliant installation process according to any one of the preceding claims, and this system comprising at least one cable (10) forming a transducer capable of transforming a force exerted on said cable into a measurable electrical quantity, a portion of said cable being intended to be fixed on the around the leaf or the frame and a remaining portion of the cable not being intended to be fixed on the periphery of the leaf or the frame, characterized in that it comprises a winding mechanism (70) suitable for winding the remaining portion cable around a coil (72).