EP1669519A1 - System for a security enclosure - Google Patents

Abstract

The enclosure has a flexible barrier forming unit (15) movably connected to posts (3, 4) by an alarm unit (18), which detects a support on the unit (15). The unit (15) has cables (1, 2) connected with soft nets (16, 17), which are independently connected with the posts by bars (19, 20), such that the nets lower freely downwards by a load for pressuring the cable (2). The cable (2) is at a height of 60 centimeter (cm) from ground.

Description

The present invention relates to a security perimeter system. The invention will be more particularly described and exemplified with respect to its application as a security perimeter for a domestic pool.

• les barrières de protection, pour lesquelles la norme impose notamment une hauteur minimum de 1,10 m ; de telles barrières sont généralement constituées de barreaux verticaux ou de panneaux transparents ;
• les couvertures de sécurité, qui peuvent être des couvertures automatiques à lames PVC immergées ou hors sol, ou une bâche tendue sur des barres métalliques ;
• les abris, existant en forme haute ou basse, coulissant ou amovibles ;
• les alarmes d'immersion, souvent placées sur la margelle, et détectant la chute d'un corps, au bout de quelques secondes ;
• les alarmes périmètriques, parmi lesquels un système avec deux faisceaux optiques, un à 45 cm du sol, l'autre au ras du sol pour détecter le passage d'un enfant par coupure d'un des faisceaux, ou encore un système avec une barrière de 60 cm de haut solidaire d'une alarme de franchissement par faisceau au dessus de l'obstacle.

Recent legislative and legislative developments in France have introduced the obligation for private owners of domestic swimming pools to equip themselves with a safety system that limits or even prevents access to the pool by an unauthorized person, such as a child. so as to reduce the risk of the child falling into, or unable to approach, without the supervision of an adult. A technical need has therefore been created by the legislator for which the following technical solutions have already been proposed:

• protective barriers, for which the standard imposes a minimum height of 1,10 m; such barriers are generally made of vertical bars or transparent panels;
• safety blankets, which may be automatic covers with submerged or above-ground PVC blades, or tarpaulins stretched over metal bars;
• shelters, existing in high or low form, sliding or removable;
• immersion alarms, often placed on the lip, and detecting the fall of a body, after a few seconds;
• perimeter alarms, including a system with two optical beams, one at 45 cm from the floor, the other at ground level to detect the passage of a child by cutting a beam, or a system with a barrier 60 cm high with a beam crossing alarm above the obstacle.

• pour les barrières de sécurité : l'esthétique réduit, coût élevé, l'obligation d'avoir un portillon sécurisé, l'absence d'alerte en cas de franchissement, et l'inefficacité du système si le portillon n'est pas fermé ;
• pour les couvertures : l'impossibilité de couvrir certains bassins dont les formes sont libres, ou les grands bassins, l'esthétique réduit, le coût élevé, l'entretien important, le vieillissement important, la maniabilité réduite, l'absence d'alerte en cas de franchissement, et l'inefficacité du système si la couverture n'est pas fermée ;
• pour les abris : l'esthétique réduit, le coût élevé, l'entretien important, le vieillissement important, la maniabilité réduite, l'absence d'alerte en cas de franchissement, et l'inefficacité du système si l'abri n'est pas fermé ;
• alarmes d'immersion : ne sont déclenchées qu'après la chute dans l'eau, donc non-préventives, avec des risques de déclenchements intempestifs, ne conviennent pas avec certains systèmes de nage à contre-courant et robots, nécessitent un niveau d'eau constant, ont tendance à être fragiles, vieillissent mal ou tôt, et l'inefficacité du système si l'alarme n'est pas activée, notamment entre deux baignades, là où le risque de noyade est souvent au plus important ;
• alarmes périmètriques : leur coût élevé, les risques de déclenchements intempestifs fréquents par des animaux, elles ne constituent pas véritablement un obstacle, avec le risque de trouver l'enfant ou l'animal déjà dans l'eau en cas de franchissement rapide des faisceaux ;
• alarmes périmètriques avec barrière et faisceau optique : leur coût élevé, l'esthétique réduit des barrières en barreaux et filets, l'entretien et le vieillissement importants des barrières en panneaux transparents, et l'inefficacité du système si l'alarme n'est pas activée, puisque l'alarme doit être désactivée pour le franchissement d'un adulte.

All these systems have defects or disadvantages, namely:

• for safety barriers: reduced aesthetics, high cost, the obligation to have a secure gate, the absence of an alert in case of crossing, and the inefficiency of the system if the gate is not closed;
• for blankets: the impossibility of covering certain basins whose shapes are free, or large basins, reduced aesthetics, high cost, high maintenance, significant aging, reduced maneuverability, lack of alert when crossing, and system inefficiency is not closed;
• for shelters: reduced aesthetics, high cost, high maintenance, significant aging, reduced maneuverability, lack of warning when crossing, and system inefficiency if the shelter is not not closed;
• immersion alarms: are triggered only after falling into the water, so non-preventative, with risks of nuisance tripping, not suitable with some counter-current swimming systems and robots, require a level of constant water, tend to be fragile, age badly or early, and the inefficiency of the system if the alarm is not activated, especially between two swimming, where the risk of drowning is often the most important;
• perimetric alarms: their high cost, the risks of frequent nuisance tripping by animals, they do not really constitute an obstacle, with the risk of finding the child or the animal already in the water in case of rapid crossing of the beams;
• Perimeter alarms with barrier and optical beam: high cost, reduced aesthetics of bar and net barriers, significant maintenance and aging of transparent board barriers, and inefficient system if alarm is not activated, since the alarm must be deactivated for crossing an adult.

• une pluralité d'éléments porteurs ;
• des moyens formant barrière portés par, et disposés entre, au moins deux éléments porteurs, le système étant plus particulièrement caractérisé en ce que les moyens formant barrière sont flexibles, et sont reliés aux éléments porteurs de manière mobile par des moyens d'alarme.

The applicant of the present invention has found a way to overcome its disadvantages with an alternative safety perimeter system. According to the invention, the security perimeter comprises:

• a plurality of carrier members;
• barrier means carried by, and disposed between, at least two carrier members, the system being more particularly characterized in that the barrier means is flexible, and is movably connected to the carrier members by alarm means.

In a preferred embodiment, the flexible barrier means comprise at least one wire element associated with at least one obstacle, the at least one wire element being movably connected to alarm means.

Preferably, the at least one wire element is chosen from the group consisting of a cable, a bar, a chain, a chain, a high-strength filament of synthetic or inorganic material, and preferably is a metal cable.

According to an even more preferred embodiment, the at least one obstacle is a net or a series of cables arranged between two supporting elements.

• au moins un moyen capable de subir de manière réversible une déformation élastique, et plus préférentiellement un ressort, raccordé à au moins un élément filaire ;
• au moins un tendeur, raccordé à au moins un moyen de déformation élastique réversible, le tendeur et ce moyen définissant ensemble un point de référence ;
• et un dispositif de contact électrique raccordé à une alarme, le dispositif de contact électrique corrélant un changement de tension mécanique au-delà d'un seuil prédéterminé dans au moins un élément filaire par rapport au point de référence et actionnant de ce fait l'alarme.

In another particularly preferred embodiment, the alarm means comprise:

• at least one means capable of reversibly undergoing elastic deformation, and more preferably a spring, connected to at least one wire element;
• at least one tensioner, connected to at least one reversible elastic deformation means, the tensioner and this means together defining a reference point;
• and an electrical contact device connected to an alarm, the electrical contact device correlating a mechanical voltage change beyond a predetermined threshold in at least one wire element with respect to the reference point and thereby actuating the alarm .

In a very advantageous and preferred embodiment, a first wire element is disposed about 5 cm from the ground. According to the same preferred embodiment, a second wire element may be disposed about 60 cm from the ground.

Even more preferably, the at least one obstacle is attached to a carrier element by a vertical bar.

Preferably, the at least one wire element has two ends, only one of which is directly attached to a carrier element.

In a preferred embodiment, the at least one wire element is a bar, and is arranged transversely between two elements carrying a movement towards the ground of the wire element beyond the predetermined threshold moving the reference point and thus actuating the electrical contact device to trigger the alarm.

• Brève Description des Figures
• La Figure 1 représente une vue schématique d'un segment du système de périmètre de sécurité selon la présente invention ;
• Les Figures 2a et 2b représentent une vue schématique modélisant les forces impliquées dans le système selon l'invention ;
• Les Figures 3a, 3b et 3c représentent d'autres vues schématiques de la modélisation des forces et de leur résolution dans un système selon l'invention
• La Figure 4 représente une variante d'exécution du système selon l'invention, basé sur le même principe.

The present invention is illustrated by the following detailed description and figures, in which:

• Brief Description of the Figures
• Figure 1 is a schematic view of a segment of the security perimeter system according to the present invention;
• Figures 2a and 2b show a schematic view modeling the forces involved in the system according to the invention;
• FIGS. 3a, 3b and 3c show other schematic views of the modeling of the forces and their resolution in a system according to the invention
• Figure 4 shows an alternative embodiment of the system according to the invention, based on the same principle.

Detailed Description of the Invention

A safety perimeter system according to the present invention is shown in FIG. 1. The security perimeter system is preferably a low and flexible fence. The fence consists of a plurality of substantially vertical support members 3,4 and positioned substantially perpendicular to the ground 8. These support elements 3,4, are preferably poles, more preferably wood or metal. The bearing elements 3,4 can be fixed to the ground by any suitable fastening means 11, 12, 13, 14, for example, by bolting, screwing, anchoring, with dowels, bolts, bolts, or by sealing, by example in a location provided in the soil with a hydraulic or synthetic binder, generally known to those skilled in the art, for example concrete, cement, or resin containing a hydraulic binder. The system also comprises means, generally indicated by the arrow 15, forming a flexible barrier. These flexible barrier means preferably comprise a combination of wire elements 1.2 stretched between two load-bearing members, for example 1,2, and at least one obstacle 16, 17, for example nets 16, 17, but it is also possible to provide only cables. Stretchable wire elements 1,2 are preferably cables, but they can also be chosen in the group consisting of chains, horizontal bars (Fig. 4a, 4b), wires of resistant synthetic material, or wire composites, etc. The flexible barrier means 15 are associated with means, indicated generally by an arrow under the number 18, crossing alarm detecting a bearing on the flexible barrier means 15, so as to prevent in case of attempted passage a person relying on the wire elements 1,2 or the at least one obstacle 16,17.

The device according to the invention is therefore constituted, in a first preferred embodiment, and for a segment of the perimeter, of two end posts 3,4, of one or more intermediate posts, and of two cables. 1.2 horizontal, the first cable 1 to a few centimeters from the ground, for example, 5 cm, the second cable 2 to about 60 cm from the ground 8. The flexible barrier means 15 also comprise at least one obstacle 16,17, which is arranged between the two cables 1,2 and which can be constituted in different ways, including a net such as boat thread nets, or multiple cables. This obstacle 16,17 between the two cables is preferably both soft and secured to the two cables 1,2. It can then, preferably, be a net with a mesh corresponding to the dimensions retained by the AFNOR standard to prevent the jamming of the fingers, or the passage of the head of a child, or mesh between 45 mm and 102 mm. It can also be cables stretched horizontally, with a spacing of 45 mm to 102 mm, interconnected by horizontal rods that make them integral with the two cables 1,2. The thread or nets 16,17 representing the obstacle, can be attached to the cables 1,2, either by entangling the cables respectively in the mesh of the net, or by providing an additional fastening element, for example rings, fixed to the edges of the net, and in which cables 1.2 pass. In addition, the thread or threads 16, 17 are each fixed independently to the end posts 3, 4 by at least one vertical bar 19, 20, having substantially the same length as the posts 1, 2, and being anchored in the posts 3,4. In the case of an attempt to cross a child near the post 3,4, the connection of the net 16,17 with the post 3,4 through the bar 19,20, allows the net 16,17, to descend freely to the bottom under the action of a load, for example the foot of a child, to put pressure on the upper cable 2.

Alarm means 18, detect an action on one of the two cables 1,2, during an attempt to cross a child. Contrary to the NFP90-306 standard on gates, we do not seek here to remove any point of support, but that any support of a child in this zone triggers the alarm by action on the cables 1,2. The minimum height is defined according to the child's crossing height. Annex C of the NFP 307 standard holds 45 cm for the perimeter optical beam detection test. This height of 45 cm could be the minimum height corresponding to the collapse of the upper cable under the action of the triggering load. The height at rest would then preferably be 55 cm, for an arrow of 10 cm, or even more preferably 60 cm to add a margin of safety.

The system is described below with reference to Figure 1. To form a segment, a first 1 and second 2 cables are stretched between two posts 3,4, the first 1 to a few centimeters from the ground, for example 5 cm, and the second 2 to 60 cm for example. One or more intermediate posts will or will not be necessary, their number being determined according to the length of the segment. These intermediate posts, if present, have a guide 6.7 for each of the two cables 1,2. The segments can be placed on a floor 8 horizontal plane or slope. Certain irregularities in soil 8 may be accepted without modification. Others may have to be corrected by modifying the ground 8. In the case of a non-rectilinear segment, the posts 3,4,5 may be used as angle deflection, thanks to a system of return angle 21,22, in the horizontal and vertical planes. The effort at the head of the pole will be taken into account for its resistance and that of its foundation. For a segment, it is preferable, for example, to limit to a sum of angles less than 45 °.

In one of the two posts 4 of the segment, the cables 1, 2 are fixed, for example by a piece of crimped hardware 9,10. In the other pole 3, these two cables 1,2 are connected to the alarm means 18. The alarm means 18 comprise means 23,24, capable of undergoing a reversible elastic deformation, for example at least one spring 23 , 24, for each cable 1,2, and at least one tensioner 25,26 each connected to the springs 23,24, cables 1,2. Each cable 1, 2, has a horizontal section, then a vertical section, the return angle at 90 ° being constituted by a return pulley 21, 22 or other angle deflection device. The vertical assembly constituted by the cables, springs and tensioners is identified in the middle by a reference point 27. The assembly of this assembly is symmetrical with respect to this reference point 27. The reference point 27 is at the point d balance, when the tensioner 25,26 is set so that the cables 1,2 are of equal lengths. The position of the tensioners 25,26 and springs 23,24, is given by way of example, they can be placed in particular in the other post, or oriented differently, as shown in Figures 4a, 4b.

One of the advantages of this system according to the invention is that it makes it possible to cancel the effects of the expansion as a function of temperature for the displacement of the reference point 27, which controls the triggering of the alarm.

The action on one of the cables 1, 2 causes a vertical displacement of the reference point 27 from bottom to top 28 or from top to bottom 29. For a determined travel Δl, the displacement 28, 29 causes an opening, or respectively a closure , an electrical contact device 30,31, for triggering the alarm system. The above electrical contact device 30,31 connecting the displacement 28,29 of the reference point 27 to an electrical contact can be, preferably but not limited to, a magnet acting on ILS bulbs, but it is also possible to use equivalent devices such as the possibility of moving a target in front of an optical ray, or a cursor pressing a push button, etc. The electrical contact device is itself coupled to an alarm, which may be audible, visual, or of a type generally known to those skilled in the art.

• de la force P exercée sur le fil, provoquant une flèche y ;
• de la longueur horizontale de câble L entre 2 poteaux (d'angle ou intermédiaire) ;
• du point d'action de la force P dans ce segment (x) ;
• du coefficient k du ressort ;
• de la tension initiale du ressort ;
• de la température extérieure ;
• de l'étirement du câble sous tension ;
• du poids du filet et du câble.

Referring now to Figures 2a, 2b, and 2c, the calculations involved in determining the operational value ranges will be readily understood. The displacement of the reference point Δl is a function of:

• the force P exerted on the wire, causing an arrow y;
• the horizontal cable length L between 2 posts (corner or intermediate);
• the point of action of the force P in this segment (x);
• the coefficient k of the spring;
• the initial tension of the spring;
• outside temperature;
• stretching the live cable;
• the weight of the net and the cable.

pour x = 0, on obtient y = f (flèche à l'axe) et MF= MF' = a
soit avec pythagore : a² = f² + L²/4
on en déduit : 4ײ/(L² + 4f²) + y²/f² = 1
et $\mathrm{M}\mathrm{F}+\mathrm{M}{\mathrm{F}}^{\prime }=2\sqrt{L^2+4f^2}=\mathrm{L}+\mathrm{\Delta }\mathrm{l}$

soit : $\mathrm{\Delta }\mathrm{l}=\sqrt{L^2+4f^2}-\mathrm{L},\mathrm{\hspace{0.17em}}\mathrm{ou}\mathrm{\hspace{0.17em}}\mathrm{f}=\mathrm{\Delta }\mathrm{l}\left(\mathrm{\Delta }\mathrm{l}+2\mathrm{L}\right)/4$

on a aussi : sinα = y/MF
sinβ = y/MF' $$\mathrm{M}{\mathrm{F}}^2={\mathrm{y}}^2+{\left(\mathrm{L}/2+\mathrm{x}\right)}^2$$

$$\mathrm{M}{{\mathrm{F}}^{\prime }}^2={\mathrm{y}}^2+{\left(\mathrm{L}/2-\mathrm{x}\right)}^2$$

In Figure 2b, if F and F 'are the poles, and M the point of action of the triggering force P, M (x, y) describes an ellipsis portion of F and F' foci. We can deduce the following equations: $${\mathrm{x}}^{\mathrm{two}}/{\mathrm{at}}^{\mathrm{two}}+\mathrm{there}/{\mathrm{b}}^{\mathrm{two}}=1\mathrm{}\mathrm{and}\mathrm{}\mathrm{M}\mathrm{F}+\mathrm{M}{\mathrm{F}}^{\text{'}}=\mathrm{two}\mathrm{at}$$

for x = 0, we obtain y = f (arrow on the axis) and MF = MF '= a
either with pythagore: a ² = f ² + L ^2/4
we deduce: 4 × ² / (L ² + 4f ² ) + y ² / f ² = 1
and $\mathrm{M}\mathrm{F}+\mathrm{M}{\mathrm{F}}^{\text{'}}=\mathrm{two}\sqrt{{\mathrm{The}}^{\mathrm{two}}+4f^{\mathrm{two}}}=\mathrm{The}+\mathrm{\Delta }\mathrm{l}$

is : $\mathrm{\Delta }\mathrm{l}=\sqrt{{\mathrm{The}}^{\mathrm{two}}+4f^{\mathrm{two}}}-\mathrm{The},\mathrm{}\mathrm{or}\mathrm{}\mathrm{f}=\mathrm{\Delta }\mathrm{l}\left(\mathrm{\Delta }\mathrm{l}+\mathrm{two}\mathrm{The}\right)/4$

we also have: sinα = y / MF
sinβ = y / MF ' $$\mathrm{M}{\mathrm{F}}^{\mathrm{two}}={\mathrm{there}}^{\mathrm{two}}+{\left(\mathrm{The}/\mathrm{two}+\mathrm{x}\right)}^{\mathrm{two}}$$

$$\mathrm{M}{{\mathrm{F}}^{\text{'}}}^{\mathrm{two}}={\mathrm{there}}^{\mathrm{two}}+{\left(\mathrm{The}/\mathrm{two}-\mathrm{x}\right)}^{\mathrm{two}}$$

If one places oneself in mechanics of forces, one can schematize as it is represented in Figures 3a, b, c. For example, taking Figure 3c, the equation of equilibrium on the vertical axis gives: P = Tsinα + Tsinβ
or T = P / (sinα + sinβ)
If another force T1 is introduced due to the initial tension of the spring:
T becomes T + T1, hence: P = (T + T1) (sinα + sinβ).

• une flèche f ;
• une longueur L=FF' ;
• un poids P correspondant au poids d'un enfant ou d'un animal, ajouté à la résultante du poids du câble et du filet ;
• une position x d'application de ce poids P sur le câble ;
• un allongement Δl1 initial du ressort (avant application de P) ;

In concrete terms, we fix the following data:

• an arrow f;
• a length L = FF ';
• a weight P corresponding to the weight of a child or an animal, added to the result of the weight of the rope and the net;
• a position x of application of this weight P on the cable;
• an elongation Δl1 initial spring (before application of P);

• l'allongement : $\mathrm{<figure-callout\; id="2"\; label="\Delta \; l"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">\Delta </figure-callout>}\mathrm{l}\mathrm{}2=\sqrt{{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">L</figure-callout>}}^2+4{\mathrm{<figure-callout\; id="2"\; label="f"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">f</figure-callout>}}^2}-\mathrm{L}$
  
• L dû à la force P
• la valeur de la flèche : $\mathrm{y}=\sqrt{{\mathrm{<figure-callout\; id="2"\; label="f"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">f</figure-callout>}}^2}-\left(4{\mathrm{x}}^2/\left({\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">L</figure-callout>}}^2+{\mathrm{f}}^2\right)\right)$
  
• la tension totale : (T + T1) = P/(sinα + sinβ)
• avec sinα = y/MF
• sinβ = y/MF' $$\mathrm{<figure-callout\; id="2"\; label="M\; F"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">M</figure-callout>}{\mathrm{F}}^{}{\mathrm{}}^2={\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">y</figure-callout>}}^2+{\left(\mathrm{L}/2+\mathrm{x}\right)}^2$$
  
  $$\mathrm{M}{{\mathrm{F}}^{\prime }}^2={\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">y</figure-callout>}}^2+{\left(\mathrm{L}/2-\mathrm{x}\right)}^2$$
  
• le coefficient du ressort k = (T+ T1)/(Δ|1 + Δ|2)
• la tension initiale T1 = kΔ|1

We can deduce the following values:

• lengthening: $\mathrm{\Delta }\mathrm{l}\mathrm{two}=\sqrt{{\mathrm{The}}^{\mathrm{two}}+4f^{\mathrm{two}}}-\mathrm{The}$
  
• L due to the force P
• the value of the arrow: $\mathrm{there}=\sqrt{f^{\mathrm{two}}}-\left(4{\mathrm{x}}^{\mathrm{two}}/\left({\mathrm{The}}^{\mathrm{two}}+{\mathrm{f}}^{\mathrm{two}}\right)\right)$
  
• the total voltage: (T + T1) = P / (sinα + sinβ)
• with sinα = y / MF
• sinβ = y / MF ' $$\mathrm{M}{\mathrm{F}}^{\mathrm{two}}={\mathrm{there}}^{\mathrm{two}}+{\left(\mathrm{The}/\mathrm{two}+\mathrm{x}\right)}^{\mathrm{two}}$$
  
  $$\mathrm{M}{{\mathrm{F}}^{\text{'}}}^{\mathrm{two}}={\mathrm{there}}^{\mathrm{two}}+{\left(\mathrm{The}/\mathrm{two}-\mathrm{x}\right)}^{\mathrm{two}}$$
  
• the coefficient of the spring k = (T + T1) / (Δ | 1 + Δ | 2)
• the initial voltage T1 = kΔ | 1

• la tension initiale T1 permet d'absorber l'allongement du câble en période de canicule. T1 ne doit pas être trop forte non plus, car cette tension réduit la sensibilité du câble ;
• la flèche f ne doit pas être trop importante (hauteur minimale de l'obstacle par rapport à l'enjambement de l'enfant), ni trop faible (problème de résultante importante sur le câble sous l'effet du poids) ;
• la longueur L donne une sensibilité au système, et doit donc rester dans une fourchette de valeurs. Les projets de protection périmètrique de piscine peuvent présenter des segments de longueurs variables. Idéalement, on doit pouvoir trouver dans tous les cas, un espacement entre poteaux tombant dans la fourchette de valeurs citée plus haut.

Thanks to these formulas of calculation, one can simulate all the cases, by varying the different parameters. We realize the following constraints:

• the initial tension T1 makes it possible to absorb the elongation of the cable during heat waves. T1 should not be too strong either, because this voltage reduces the sensitivity of the cable;
• the arrow f must not be too large (minimum height of the obstacle relative to the child's straddling), nor too weak (significant problem of resultant on the cable under the effect of the weight);
• the length L gives a sensitivity to the system, and must therefore remain within a range of values. Perimeter pool protection projects may have segments of varying lengths. Ideally, we should find in all cases a spacing between poles falling within the range of values mentioned above.

• f = 0,113 m
• L=3m
• x=0
• P = 1,18 daN (dont 0,15 daN pour filet+câble)
• Δl1 = 0,018 m à 40°C
• on trouve : Δl2 = 0,085 m
• k = 3000 N/m

Encrypted example:

• f = 0.113 m
• L = 3m
• x = 0
• P = 1.18 daN (of which 0.15 daN for thread + cable)
• Δl1 = 0.018 m at 40 ° C
• we find: Δl2 = 0.085 m
• k = 3000 N / m

• lorsque la force F est exercée au milieu d'un segment, et dans les conditions de canicule. L'éxemple chiffré donne un poids correspondant à 1Kg. Dans ce cas, le problème serait que cette forte sensibilité ne génère des déclenchements intempestifs. Peu de petits animaux font plus de 1 Kg, et un chat ou un chien ont tendance à sauter par-dessus l'obstacle, ou le déclenche une seule fois, auquel cas ils voient l'obstacle et l'associent à l'alarme. L'action du vent n'a que très peu d'influence sur le système, puisque l'effet porte sur la surface du filet,16,17, donc sur les deux câbles 1,2, en même temps, puisqu'il n'y a aucun déplacement du point de référence 27. L'action d'un ballon peut déclencher l'alarme, s'il agit sur un seul des deux câbles, et non sur le filet, qui répartit les charges sur les deux câbles 1,2 ;
• lorsque la force F est exercée au plus proche d'un poteau 3,4, soit lorsque l'enfant voudra franchir la clôture en tentant de prendre appui avec un pied sur une maille du filet 16,17 près d'un poteau, et dans les conditions de température la plus froide, c'est-à-dire lorsque le câble 1,2 est rétracté. Les calculs donnent, pour une température de - 20°C, un poids de déclenchement correspondant à un enfant de 6,5 Kg, soit un enfant de plus de 6 mois. La seule faille serait qu'un enfant de moins de 6,5 Kg puisse franchir l'obstacle à - 20°C, à 10 cm du poteau, sans secousse sur le filet 16,17.

It will be noted that the most unfavorable cases are:

• when the force F is exerted in the middle of a segment, and in the conditions of heat wave. The numerical example gives a weight corresponding to 1 kg. In this case, the problem would be that this high sensitivity does not generate untimely triggers. Few small animals weigh more than 1 kg, and a cat or dog tends to jump over the obstacle, or triggers it once, in which case they see the obstacle and associate it with the alarm. The action of the wind has very little influence on the system, since the effect is on the surface of the net, 16,17, therefore on the two cables 1,2, at the same time, since There is no displacement of the reference point 27. The action of a balloon can trigger the alarm, if it acts on only one of the two cables, and not on the net, which distributes the loads on the two cables 1 , 2;
• when the force F is exerted as close as possible to a post 3,4, or when the child wishes to cross the fence while attempting to rest with one foot on a mesh of the net 16,17 near a post, and in the coldest temperature conditions, that is to say when the cable 1,2 is retracted. The calculations give, for a temperature of -20 ° C, a trigger weight corresponding to a child of 6.5 kg, ie a child over 6 months. The only fault would be that a child under 6.5 kg could cross the obstacle at -20 ° C, 10 cm from the pole, without shaking the net 16,17.

In order to prevent the springs 23, 24 from being damaged by the action of an excessive force, for example in the case of an adult who falls on the cable 1, 2, the springs 23, 24 may have a limited adjustable stroke. In addition, a fuse may be installed to limit the forces at the head of corner posts, for example a breakaway pin programmed, or a small diameter cable. Indeed, the cable tension 1,2, is much larger than the vertical load. As an example, a maximum tension of 50 kg can be used.

Variations may be made by keeping the two independent cables, and by positioning on each cable the combination of cooperating means contactor device / springs / tensioners, on a pole placed in the middle of the segment delimited by the two corner posts 1.2. This variant makes it possible to preserve the principle of the immobility of the reference point under the action of the expansion. For the bottom cable 1, you can also simply prevent the passage, thanks to a very tight cable or bars.

Another variant illustrated in Figures 4a and 4b can be made with upper bars 1 between each post 3,4,5, instead of the cables of the first embodiment, pushed at each end by springs 23,24. In this variant, the operating principle of the system is the same as above, except that here a vertical action 29 shifts one of the bars 1 downwards. To trigger an alarm, one can take into account, for example, the movement of a cable 32 placed in a pole 5 between two bars 1.1 adjacent. To prevent the passage under the obstacle, another cable 33 can be stretched.

Although the legislation and standards currently require a mandatory siren system, it is also possible to connect a visual signal, a floodlight, outdoor lights, a phone call, etc., or any other equivalent means that allows a third person to become aware of the triggering of the alarm. Finally, 3,4,5 posts can optionally receive a lighting system, according to the principles of outdoor lighting placed around a pool.

• il s'agit d'une alarme qui alerte avant la chute éventuelle dans la piscine ;
• les moyens formant barrière 16,17 sont souples et flexibles, d'environ 60 cm de hauteur au sol, donc déjà difficilement franchissable par un enfant de moins de 5 ans, et qui en tout cas retardera la chute éventuelle dans la piscine, tout en ayant donné l'alerte ;
• la souplesse limite les risques de choc qu'on peut avoir sur un obstacle rigide ;
• il n'y a pas de nécessité de portillon d'accès, puisque la hauteur permet le franchissement par un adulte ou des grands enfants ;
• le système est toujours efficace, car on ne coupe pas l'alarme, on n'enlève pas la barrière, on n'ouvre pas de portillon pour aller se baigner ;
• c'est la seule barrière qui peut accepter des filets, et des câbles horizontaux ;
• il y a peu d'entretien et de vieillissement, car ce sont des éléments utilisés dans le domaine nautique, et il y a peu d'électronique ;
• l'esthétique recherchée est de préférence celle des bateaux avec des matériaux métalliques, en inox de préférence, et bois éventuellement, pour les poteaux, en utilisant des pièces d'accastillage, des câbles, ou des filets de pont de bateau. La hauteur de l'obstacle est de l'ordre de celle des filets de protection sur les ponts de bateaux. La similitude est donc réelle, et ce dispositif reste discret ;
• le coût est moins élevé qu'une barrière rigide, une couverture, un abri, et une alarme périmètrique.

According to the perimeter security system according to the invention, the disadvantages of the various existing systems are eliminated:

• it is an alarm that alerts before the eventual fall into the pool;
• the barrier means 16, 17 are flexible and flexible, about 60 cm high on the ground, so already difficult to cross by a child under 5, and that in any case delay the eventual fall into the pool, while giving the alert;
• the flexibility limits the risks of shock that can be had on a rigid obstacle;
• there is no need for an access gate, since the height allows the crossing by an adult or older children;
• the system is always effective because you do not turn off the alarm, you do not remove the barrier, you do not open a gate to go swimming;
• it is the only barrier that can accept nets, and horizontal cables;
• there is little maintenance and aging, because they are used in the nautical field, and there is little electronics;
• the desired aesthetic is preferably that of boats with metal materials, preferably stainless steel, and possibly wood, for poles, using fittings, cables, or boat deck nets. The height of the obstacle is of the order of the protection nets on the boat decks. The similarity is real, and this device remains discreet;
• the cost is lower than a rigid barrier, a blanket, a shelter, and a perimeter alarm.

Claims (10)

Perimeter security system comprising: a plurality of support elements 3,4; barrier means 15 carried by, and arranged between, at least two carrying elements 3,4 characterized in that the barrier means 15 are flexible, and are connected to the carrier members 3,4 movably by alarm means 18. Perimeter security system according to claim 1, characterized in that the flexible barrier means 15 comprise at least one wire element 1,2, associated with at least one obstacle 16,17, the at least one wire element being connected in a mobile manner alarm means 18. The safety perimeter system of claim 1 or claim 2, wherein the at least one wire element 1,2 is selected from the group consisting of a cable, a bar, a chain, a chain, a high-strength synthetic filament or inorganic, and preferably is a wire rope. The safety perimeter system of claim 2, wherein the at least one obstacle 16,17 is a net or a series of cables arranged between two support members 3,4. The security perimeter system of claim 2, wherein the alarm means comprises: at least one means capable of undergoing a reversible elastic deformation, more preferably a spring 23, 24, connected to at least one wire element 1, 2; - At least one tensioner 25,26, connected to at least one elastic deformation means 23,24, the tensioner and this means together defining a reference point 27; - and an electrical contact device 30,31 connected to an alarm, the electrical contact device correlating a mechanical voltage change beyond a predetermined threshold in at least one wire element with respect to the reference point and thereby actuating the alarm. The security perimeter system of claim 2, wherein a first wire element is disposed about 5 cm from the ground. The security perimeter system of claim 2, wherein a second wire element is disposed about 60 cm from the ground. The security perimeter system of claim 2, wherein the at least one obstacle 16,17 is attached to a support member 3,4 by a vertical bar. Security perimeter system according to claim 2, wherein the at least one wire element has two ends, only one of which is directly attached to a carrier element 4. The security perimeter system of claim 2, wherein the at least one wire element 1 is a bar, and is disposed transversely between two supporting members 3,4, a ground motion of the wire element beyond the predetermined threshold moving the reference point and thus actuating the electrical contact device to trigger the alarm.

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