WO2003015046A1

WO2003015046A1 - Rescue and safety device for swimming pools and leisure parks

Info

Publication number: WO2003015046A1
Application number: PCT/CH2002/000435
Authority: WO
Inventors: Claire-Lise Boujon
Original assignee: Claire-Lise Boujon
Priority date: 2001-08-08
Filing date: 2002-08-08
Publication date: 2003-02-20

Abstract

The invention concerns a rescue and safety device for swimming pools and leisure parks consisting of a watchband with a cardiac detector, a panic button, optionally a water detector, triggering in case of hydrocussion, cardiac arrest, or accident, a rescue device, in particular an inflatable grid resting on the bottom of the swimming pool which brings up to the surface, in case of alert, any distressed person.

Description

RESCUE, SAFETY DEVICE, FOR SWIMMING POOLS, RECREATION PARKS.

Rescue and safety device for swimming pools and leisure parks which aims to prevent drowning by detecting cardiac arrest, getting someone in difficulty out of the water, drowning or falling into the pool without human intervention thanks in particular to the competition of the inflatable grid described in document WO 01/06076 A1, and / or of activating a self-protection rescue device capable of warning the emergency services.

This is a new concept, the device is made up of elements that will be used according to the type of pool and environment and allow establishing degrees of selection of implementation of means ensuring safety.

The background of the technique mentions the document WO 9718542 which proposes a system for monitoring public swimming pools.

This document has many drawbacks. This device offers monitoring of public swimming pool funds, which analyzes movement and which after 15 seconds of almost immobility only triggers an alarm. This device is only intended for public swimming pools. It only provides surveillance assistance. It is not autonomous because human intervention remains necessary to rescue a person in difficulty. A guard must supervise the pool and a lifeguard must dive to the bottom of the pool to search for the person, bring them back to the surface, remove them from the water, which is a delicate operation and takes considerable time.

If the pool is full of swimmers, it is not easy to dive in the midst of the eddies, of people who fidget, to go get someone at the bottom in a specific place.

Document US 4063410 proposes a wristwatch with a transmitter, but which has the following drawbacks: the heartbeat detector is a device external to the watch, it is not an integral part of an automatic person rescue device. It is not a receiver and cannot receive a signal of the presence of transmitted fields. The heartbeat detector works like a device that is added to the watch, this option is not integrated in the watch. The probes are not included in the watch, which makes the watch unusable in swimming pools because probes with external wire and connector are not suitable for use in water. The document WO 01/06076 A1 presents a device in the form of an inflatable grid, making it possible to bring to the surface any person who swims in the pool and any person in difficulty in record time, but still someone has to intervene to trigger the device, control of inflation / deflation is not ensured.

This device has slides which, if they have advantages of solidity and stability, are difficult to adapt to liner-type pools, to overcome this drawback means for ensuring rigidity, fixings and moorings have been developed.

These are the reasons for the present invention which proposes to overcome these main drawbacks.

It is a complete device which adapts to private and public pools and which is capable of operating autonomously without human intervention to prevent falls, to rise to the surface and get people out of the water , inflate and deflate the grid in case of emergency and non-emergency, locate accidents that may occur around a swimming pool or in a leisure park.

Safety in a public swimming pool, safety begins with the fact that each swimmer arriving when he puts on his wrist a watch strap with at least one cardiac arrest sensor and a panic button. The wristwatch is provided with display means with a flashing symbol indicating proper operation, when the heartbeats are detected.

The device continues to ensure security by prohibiting access to the swimming pool without wearing the watch, the watch bracelet then issues an alarm inviting the swimmer to put on or put on his watch bracelet.

For public swimming pools if they are equipped with the device described in the document WO

01/06076 Al and therefore equipped with an inflatable grid, a proximity detection device, a panic button and a cardiac arrest detector will, via the guard, activate the ascent of the grid which will sound an alarm .

As soon as a distress signal is received from the cardiac arrest sensor or the panic button, the alarm will be transmitted to the guard who will decide to activate the gate. At this time, the device transmits the data collected by the watch bracelet to a receiving central where they are displayed and / or printed while transmitting said data to a backup central, a cancellation code is provided for false alerts. If the pool is not equipped with an inflatable grid, the proximity detection device will be placed on the bottom, the walls and / or around the pool. A guard or other person in the vicinity can use the panic button and trigger an alarm, the location of the problem will be displayed on the monitors, the guard will dive to pick up the person or dispatch help to the accident site in the leisure park.

The monitor (s) can be located inside a room, be portable on the belt of the supervisors, they allow the supervisors to communicate with each other, if desired.

Safety in a private swimming pool begins with the wearing of a watch for young children or the elderly. Programmed on a water detector, in the event of a fall, if the pool is equipped with the inflatable grid, it is activated and rises to the surface, with alarm. The device has, as an option, double security in that the periphery of the swimming pool is surrounded by an optical barrier which is deactivated when bathing. It is possible to use laser beams for the optical barrier with mirrors. When you are not swimming, this barrier is connected to an alarm and activates the ascent of the grid when someone cuts the beam. This is particularly useful if a small child, an elderly person not wearing his bracelet with water detector or if an animal enters the perimeter. When the children bathe, the parents deactivate the optical barrier and / or the water detector, the cardiac arrest detector comes into play. In the event of drowning by hydrocution, the grid automatically rises to the surface. In case of discomfort, the child or another person presses his own watch and the grid rises to the surface. In the event that there is no protective grid, the water detector if activated or the cardiac arrest detector, will trigger an alarm signaling the fall into the pool.

If a person alone in his swimming pool begins to suffocate, make the cap, he will grab onto his wristwatch and the grid will rise to the surface.

In summary, in a private swimming pool, the device provides four safety means: by pressing the panic button, by detecting cardiac arrest, by accidental fall (water detector), by broken laser beam. The water detector function can be activated and deactivated as required.

On the edge of the swimming pool, for example, there is a central reception with screen and possibility either to read the information collected there in case of distress, by the watch strap worn by a swimmer: cardiac arrest, date, time, or to print them, the station transmits by wire or wirelessly, the data to a central emergency, a cancellation code is provided for false alarms. PANIC BUTTON

The panic button is placed in a cavity and covered with a membrane and will thus be made waterproof.

HEART RATE SENSOR

Basic principle: we emit light, regardless of how we emit and measure variations. A sensor is isolated from the light emitted to measure that which passes through human tissue.

There are two types of variations: a) variations in blood flow b) variations in movement

We measure the movements by the variations of light on the sensor, and the heartbeats are amplified to have variations during the immobility of the bather.

The stop is that there are no more variations in blood flow. Once the person does not move, and there are no more variations due to blood flow, it is then certain that there is a cardiac arrest.

DIFFERENTIATION BETWEEN A SHOCK ON THE WATCH STRAP AND AN ALARM

When you press the panic button to give the alarm, everyone's reflex is to be certain that the alert is given, so the person will exert a longer pressure than during an inadvertent shock, or press the panic button repeatedly or grab onto their wrist.

In this way it will be possible to make a first sort by a time delay, and to take into account that the alarms due to a serious alarm. (If there is a serious joker, this one will be amended)

ACCESS AND EXIT, ANTI-THEFT, NOT WEARING THE WATCH

Solution a): The accesses and exits from the activity zones, via the gates or airlocks, will be equipped with infrared human presence detectors and transponder detector which in passing will immediately signal that someone is passing through the airlock without the bracelet- shows by detecting the absence of the transponder and triggers an alarm, flashing light. In addition to the alarm, after the airlock, the automatic gate closes or remains closed, preventing access to activities without wearing the watch strap, the same goes for the output.

Solution b): the infrared detector is replaced by an optical barrier.

Solution c): A ground pressure detector in the form of a carpet, strip, can activate an alarm and / or flashing beacon by signaling the passage of someone beyond the demarcated space. In the case of an airlock, it will be possible to install a proximity detector which will note the non-wearing of the watch and set off an alarm, the gate giving access to the activities will be blocked. The watch constantly emits pulses that determine the presence of a watch in an area.

LOCKERS AND TRANSPONDERS

Each wristwatch has a transponder which has its own frequency (ID number). The lockers are managed by a microcontroller, either in rows or on all the lockers

WATER DETECTOR

For private pools mainly, the wristwatch can be equipped in addition to the cardiac arrest detector, with a water detector, these two functions being activated and deactivated by various means, by code, by pressure, by means of 'a mini rod to press a button inside the case, key, by turning a ring or with a selector, at the choice of the manufacturer, this description not being limiting.

In the event of a fall into the water, the wristwatch sends a signal through the transmitter. The receiver receives the signal and actuates the solenoid valve by means of a relay which raises the gate or triggers an alarm.

The water detector consists of a conduit, whatever its shape, with at least two openings and electrodes in the conduit. To evacuate the water, simply shake the watch or blow into it.

The invention will be better understood on reading the description of an embodiment in relation to swimming pools, given by way of nonlimiting example, with regard to the figures on which it is based.

Figure 1: shows a watch strap (1) the case number (2) which appears on the liquid crystal display (3), a panic button (4) Figure 2: shows the back of the watch strap case (1) with four light-emitting diodes (5), and a detector, light sensor (6)

Figure 3: shows the inside of the watch case (1) on which we can see the printed circuit (7) on which is included the transmitter (8) allowing to send the signal which activates the emergency system as well as the microcontroller (9) and the transponder (10) the turns (12). The interior of the case also includes a battery (13), there is also a liquid crystal screen (3), the panic button (4) and the flashing symbol (14) indicating the proper functioning of the watch band.

Figure 4: shows lockers (15) closed, the bather (16) having the watch strap (1) at the "lock" (17) of locker No. 25, to open the door.

The transponder located in the watch is placed in front of the lock (17) operates it without physical contact, thanks to the transponder detector (18) placed on the locker.

Figure 5: shows the bather (16) passing a door (19), overlooking the pool (20), an infrared human presence detector (21) detects the presence of the bather, thanks to the transponder detector (22) notes that the bather (16) does not wear his wristwatch and therefore actuates a flashing light (23) and an alarm (24), the gate (25) remains closed.

Figure 6: shows the inflatable grid (26) provided with the proximity sensor device (27), resting deflated on the bottom of the pool (20), with net (38) in the mesh of the grid and unlockable openings and lockable (28) allowing among other things the cleaning of the bottom of the pool. One can observe outside the swimming pool (20), a source of compressed air / gas (29), a pipe (30) forming part of the inflation system, not shown here, as well as an electromagnetic valve (55), . We can also observe a central reception (31) on the edge of the pool (20) with an antenna (32), a rotating beacon (23), screen (33), a printer (34) and an alarm (24). The central unit (31) on the edge of the swimming pool is connected to an emergency central unit (35) such as the police, fire department which receives the information by wireless transmission.

FIG. 7: represents the swimming pool (20) with the inflation system on the side, a source of compressed air / gas (29), the pipe (30) which connects the air / gas source (29) to the grid at the bottom of the pool, the electromagnetic valve (38) and a troubled swimmer (36) wearing a wristwatch (1) and pressing it, which activates the electromagnetic valve (38) and the back-up plan. We can observe other swimmers (16) who evolve in the pool. help. We can observe other swimmers (16) who evolve in the pool.

FIG. 8: represents the inflated grid (26) in the high position, with the proximity detection device (27) of the swimmers (16) recovered by the grid, the swimmer in difficulty (36) and a rescuer (37) coming to give first aid directly on the grid. The distress signal from the wristwatch (1) has been picked up by the antenna (32), inflation will be triggered via the microcontroller (9) which actuated the electromagnetic valve (38), and raises the grid ( 26), activated the rotating beacon (23) and the siren (24). The data were transmitted simultaneously to the central unit at the edge of the swimming pool (31) as well as to the emergency central unit (35) on the screens (33) and printers (34). There is also a distinction between the air / gas source (29).

Figure 9: shows a model of water detector (39), with three electrodes (40) and a conduit (41) and water flowing (42) in the conduit.

FIG. 10: represents an example of section of the watch case (1) with the panic button (4), the liquid crystal screen (3) and spacers (43), the microcontroller (9), the printed circuit ( 7), the transmitter (8) a battery (13) and a backup battery (13), the battery contacts (44), the water detector (39) and its electrodes (40), the transponder (10) , the turns (12) as well as two diodes visible here (5) on the face of the case in contact with the wrist, the wires of the electrodes (45) and the wires of the light sensor (50) connected to the printed circuit (7) . We can also observe a battery indicator (46)

FIG. 11 a: represents an example of a terminal (48) with a field power detector emitted (49), an alarm (24) and a rotating beacon (23)

Figure 11b: shows a terminal (48) with an antenna (32)

FIG. 12 a and b: represents an example of mooring making it possible to raise the grid by means of strap passes (53) fixed under the tubes (52) the straps (51) being fixed to a support (54) higher than the water level and an example of support bars (11), which are slid, round or rectangular, passed through the strap passers (53) which come to rest on the edge of the pool (20)

FIG. 13: represents an example of a block diagram with a reserve of compressed air / gas (29) three electromagnetic valves El for the emergency (55), E2 for the non-emergency (56) and E3 for the emptying (57 ) two regulators Dl for emergency (58) and D2 for non-emergency and drain (59), a pressure switch (60) with probe (61), a venturi (62), a vacuum switch (63)

Figure 14: shows an example of a block diagram, with punch button (64), panic button (4) cardiac arrest detector (65) microcontroller (9), monitor (66) and alarm (24)

FIG. 15: represents a field detector (49), a multiplexer (67) with a level adapter (68) and antennas (32) and a microcontroller (9)

FIG. 16 a, b and c: represent examples of pneumatic diagrams.

16 a): vacuum switch ensuring vacuum control (63), microcontroller (9) and alarm (24)

16 b): pressure switch, ensuring inflation control (60) microcontroller (9) El solenoid valve (55) and alarm (24)

16 c: the microcontroller (9) to which is connected (on the left in the drawing) the pressure switch (60) the punch button (64), the panic button (4), the cardiac arrest detector (65), the non-emergency ascent button (69), the vacuum switch (63), the descent button (70), the guard button (71), a control keypad (72) on the right side of the drawing, there is a valve El, emergency solenoid valve (55), solenoid valve E2 for non-emergency (56), solenoid valve E3 for emptying (57), and venturi (62), guard alarm (24), monitor (66 ), a display on the central unit (73), a computer (74)

Figure 17: shows the block diagram of the cardiac arrest detector consisting of a light source (75) passing through human tissue (76), with a light sensor (77), a filter (78), an amplifier ( 79), which will give an average in the variations (80), which are amplified (81), these variations are then rectified (82), which will give an average (83) and which gives the signal positive only (84) . The average of the positive signal is compared with a low threshold (85), if the variations fall below this low threshold (85), there is an alarm (24) either directed at the guards in public swimming pool, or on the backup for the private pool. This schematic diagram can be entered into a digital DSP signal processing circuit, via digitization.

Figure 18: shows an example of a light source, here bulb (86) and a light sensor, here photovoltaic cells (87) GRID STIFFNESS

It is ensured on the one hand by inflating to the appropriate pressure and on the other hand, it is possible, for example, to introduce into the strap-throughs described in FIG. 13 a and b, an extensible frame, repelling the forces towards the pool walls, allowing the net to be stretched. The frame is made extensible, towards the outside, by a system of notches, or of smaller bars introduced by sections in the frame, with a system of fixings, screws and nuts or a system of quick fixings, this will allow also to stiffen the frame. If the materials do not allow the grid to descend to the bottom, the frame may contain ballast, lead for example. The stability of the grid set provided by moorings located where they are desired, around the pool for example, or on the walls halfway up the path it must travel.

RISE OF THE GRID

It is ensured either by strap loops fixed under the tubes, with straps coming to be fixed on supports higher than the water level, or by support bars, which pass inside slidin the inside of the belt passers which become bar passers. These bars are extendable and will rest, once stretched on the edge of the pool, above the water level. These bars may or may not be an integral part of the extendable frame which stiffens the grid. This allows passage to the surface of the robot arm that circulates at the bottom of the pool for robots that have an arm.

DIAGRAM OF PRINCIPLE according to figure 14

If the punch button (4) is pressed, an alarm will sound (24) on the monitor (66)

If the panic button (4) is actuated: same as above - If the cardiac arrest sensor (65) comes into action, same as above with the specification of the cardiac arrest. At a glance, the guard checks if it is a real problem, on the screen and in the pool and activates the gate, the emergency services are then warned. In the case of a private swimming pool; the emergency services are alerted.

SECURITY PROVIDED FOR THE LOW POSITION

An electric or pneumatic venturi (62), via the microcontroller (9), is used to deflate the grid, this venturi is accompanied by a vacuum switch (63), which creates the degree of vacuum necessary to maintain the grid on the bottom , it is connected to an alarm, so that when a water infiltration occurs, for example sabotage, water intrusion is immediately reported. Fig. 16a

SAFETY PROVIDED WHEN THE GRILLE IS INFLATED

It is ensured, via the microcontroller (9), by a two-threshold pressure switch (60) connected to alarm (24), if the low threshold is reached, there is an air leak, the alarm sounds inviting bathers out of the grid, the inflation is started automatically via the solenoid valve El (55) Fig 16b

CONTROL OF INFLATION, DEFLATION,

There are two situations where the grid is inflated. a) in case of emergency b) in case of non-emergency, to put the grid in the high position, to serve as protection, cover or playground or to clean the bottom of the pool.

In an emergency, two possibilities: the punch button, or the system activates automatically thanks to the functions of the wristwatch.

Inflation in the event of a non-emergency and deflation, are done by descent or ascent button, they can be done in the form of a remote control.

The indicative pneumatic diagram in Figure 16c works as follows: In non-emergency

- If the ascent button is pressed (69): the Venturi is cut (62), the E3 solenoid valve (57) is closed, the E2 solenoid valve (56) is opened

- If the descent button is pressed: the E2 solenoid valve (56) is closed, the E3 solenoid valve (57) is opened, the venturi (62) and the vacuum switch (63) are engaged

Emergency

- If the caretaker button, or for private pools, the panic button or the cardiac arrest sensor comes into action: we cut the venturi (62), we close E3 (57), we open El (55)

These operations are carried out via the microcontroller.

This way of doing things is not limiting, it is possible to use 2 or 3-way solenoid valves and when several sources of air / gas are desired, the solenoid valves will be placed in parallel. Here, in relation to the figures described above, an example of non-limiting execution taking here as an example a public swimming pool, provided with an inflatable grid.

Numerous drownings in swimming pools are mainly due to:

- Drowning by hydrocution, which causes cardiac arrest, and the person sinks steadily, losing consciousness, he stops moving.

- The person drowns with discomfort, makes the cork, suffocates, she "drinks the cup"

The bather (16) who arrives at the swimming pool (20) goes towards the zone of the lockers (15) and finds fixed, on the locker or cupboard, a watch strap (1) which bears the number of the locker 25 which displayed on the liquid crystal display (3). The bather (16) takes the watch case, (1) presents it at the location of the "lock" (17), the locker (15) opens, he puts his things there, Fig.4, fixes the case watch on his wrist, a symbol (14) starts to flash at the rhythm of the heartbeat indicating the proper functioning of the wristwatch. In this embodiment The surveillance stops when the wearer of the bracelet enters the locker area.

The watch strap (1) contains a module with:

• A printed circuit (7), light-emitting diodes (5), a light detector (6), the transmitter (8), the microcontroller (9), the transponder (10) the turns (12) as well as a battery (13) Fig. 3.

The whole is connected wirelessly, by radio waves, for example FM, AM, to a receiving central (31), console with screen and printer on the edge of the swimming pool (20) or by SMS and this is also connected to a central emergency (35) such as police, ambulances, firefighters. Fig. 6.

The swimming pool is equipped with the rescue and safety device according to the following basic principle:

An inflatable grid (26) by a source of compressed air / gas (29), and its inflation system, deflation according to fig. 13, 14, 16 a, b, c. The deflated grid is placed on the bottom of the pool.

In the event of drowning by hydrocution, for example, when the person makes a cardiac arrest while sinking at peak, or at the time of cardiac malaise, the beats of the heart accelerate or fall strongly, the heart stops beating, the microcontroller, noting a signal corresponding to this heart problem coming from the diodes (5 and 6) Fig. 2, sends a signal via the internal transmitter (8) Fig. 3 of the watch strap (1) which then arrives at the receiver of the central (31) by the pool, where the cardiac arrest, date and time are displayed, the microcontroller

(9) located in the central unit, (not shown here), activates on the one hand the solenoid valve which raises the grid and on the other hand transmits the data to the aid station (35) Fig. 6. The alarm sounds, the rescuers can give first aid on the grid.

After evacuation, the grid is deflated by actuating the descent button, it is raised to the surface by actuating the ascent button to serve as a cover or playground.

LOCATION OF THE PERSON

Proximity sensors (27) are placed, as necessary, around or at the four corners of the swimming pool (20) and / or on the grid (26), making it possible to deduce the position of the person in difficulty (36). The more the number of receivers on the grid or in an area is increased, the more precise the location of the person, Fig. 8. This arrangement is particularly advantageous for large grids in one piece.

The proximity detectors are either field power sensors emitted by the watch (49) Fig. 1 la, or the location is done by the position of reception antennas (50) which pass through a level adapter (68) a multiplexer (67), the field detectors (49) and the microcontroller (9)

For grids constructed in sections, a proximity sensor, placed in the center of each section can determine which of the sections will inflate. If the person is straddling two sections, the two sections concerned will rise to the surface.

AREAS

The proximity detection device adapts to zones or sub zones in the case of amusement parks, leisure, multiple ski areas, holiday clubs, the cardiac arrest detector with panic button also.

HIDDEN DATA

In order not to distract the attention of the user, only a symbol will appear on the liquid crystal screen indicating the proper functioning of the watch strap, the time and date will be masked.

A battery indicator is optional, it can be activated and deactivated and will be placed, for example, on the internal face of the watch case in contact with the wrist.

Claims

1. Rescue device, security for swimming pools, leisure parks, characterized in that it comprises, in a watch bracelet (1): a cardiac arrest detector (65), means for automatically triggering a rescue device , self-protection, a panic button (4), optionally a water detector (39), means for activating / deactivating the water detector (39), a printed circuit (7), a transmitter ( 8), a microcontroller (9), a transponder (10), at least one battery (13), a personal identification code (2), a display means (3), at least one receiving central unit capable of communicating with other central units (31), and to notify an emergency central unit (35 a proximity detection device (27) which wristwatch is associated with an inflatable grid (26), provided with unlockable, spreadable openings and re-lockable (28) which includes certain means for inflating / deflating, raising, and evacuating.

2. Device according to claim 1, characterized in that the cardiac arrest detector (65) consists of a light source (75) passing through human tissue (76), a light sensor (77), a filter (78), an amplifier (79), which gives an average in the variations (80), which pass through an amplifier (81), then pass through a rectifier (82), the rectifier gives an average (83 ) to obtain a positive signal only (84), the average of the positive signal is then compared to a low threshold (85) and if the threshold is exceeded, an alarm (24) occurs. Fig.17.

3. Device according to claim 1, characterized in that the watch case (1) comprises the identification code (2) recorded in the transponder (10), which is capable thanks to a transponder detector (18), d '' open, close doors, lockers, and set off an alarm (24). The lockers are managed as a whole or in rows via the microcontroller (9).

4. Device according to claim 1, characterized in that the water detector (39) consists of a conduit (41) with at least two openings into which the water enters (42). In this conduit there are electrodes (40) connected to a water detection circuit which will activate a rescue device or set off an alarm. 9.

5. Device according to claim 1, characterized in that on the watch case (1), the panic button (4) is located in a cavity and covered with a waterproof membrane (47)

6. Device according to claim 1, characterized in that the proximity detectors are either field power detectors emitted by the watch (49), or antennas (32) passing through a multiplexer (67) and a level adapter ( 68) and the microcontroller (9). Fig. 15, Fig. l ia and b

7. Device according to claim 1, characterized in that the inflation of the grid is managed by a reserve of compressed air / gas (29), a solenoid valve for the emergency E1 (55), a solenoid valve for the non-emergency E2 ( 56), a solenoid valve for draining E3 (57), a regulator Dl (58) for emergency in the case where the inflation pressure required is not the same as for supplying the drain, a regulator D2 (59) for non-emergency, a pressure switch (60), a venturi (62) and a vacuum switch (63) which ensures the vacuum. The whole is managed by the microcontroller (9) on which is connected: the cardiac arrest detector (65), the panic button (4), the non-emergency ascent button (69), the vacuum switch (63), the down button (70), the keeper button (71), the alarm (24), a monitor (66), a control keyboard (72), a display on the central unit (73), a computer (74) Fig 16c

8. Device according to claim 1, characterized in that the grid is provided with simple moorings fixed around the pool or on the walls halfway of the path that the grid must travel to rise to the surface.

9. Device according to claim 1, characterized in that the grid is raised either by straps (51) and strap-through (53) fixed under the tubes, or with stretchable bars (11) which are housed inside straps, which support bars, once stretched, are placed on the edge of the pool, thereby lifting the grid to allow the robot arm to slide on the surface of the water, when the robot has an arm.

10. Device according to claim 1, characterized in that the ascent of the grid is ordered by a broken optical barrier.