KR102339252B1 - Chain-type lifesaving system - Google Patents

Abstract

A chain-type lifesaving system of the present invention comprises: a moving body; a lifesaving means having one end fixed to a bobbin part provided on the moving body and wound; and an injection part formed so that a free end of the lifesaving means is selectively injected, wherein the lifesaving means includes: a starting point buoyant body that is first injected from the injection part; a plurality of connection buoyancy bodies connected in series to in the starting point buoyancy body by the connection part; and a fluid supply part for supplying a fluid from a fluid cartridge provided in each of the starting point buoyancy body and the connection buoyancy body. When the starting point buoyancy body is injected, the fluid is filled in the starting point buoyancy body and the connection buoyancy body to expand and deploy, wherein at least one or more survivors are surrounded by the movement of the moving body. Thus, the chain-type lifesaving system can expedite rescue of survivors.

Description

Chain type lifesaving system {CHAIN-TYPE LIFESAVING SYSTEM}

The present invention relates to a chain-type lifesaving system, and more specifically, when a person in distress occurs in a river or sea that is difficult to access, an unmanned moving body injects a buoyancy body formed in a chain shape to surround the victim and toe it when the victim is easily grasped. It relates to a chain-type lifesaving sheath that can be rescued.

In general, rescue workers or rescue vehicles directly or indirectly carry out life-saving activities when there is a disaster in a river or sea.

It is possible to rescue the survivors by throwing tubes, ropes, or long rods out of the water to those who are located nearby. As a result, there is a problem that the rescue operation may be in vain as the victim may lose consciousness and die after being rescued, or cause fatal problems to the body.

In addition, in case of being swept away by waves or rip currents at the beach and in distress, rescuers directly carry rescue equipment and approach the person in distress, or use a rescue boat or the like. At this time, due to the large number of people enjoying water play, rescue boats are inevitably delayed as long as they approach the survivors from long distances. There is a problem in that one rescue time is inevitably delayed.

Therefore, when direct access to the distressed is difficult, technologies are being developed in which an unmanned moving object (such as a small unmanned aerial vehicle or drone) is used to rescue the distressed.

In this regard, as a prior art in which an unmanned mobile body is applied to rescue a shipwrecked person in the sea, Republic of Korea Patent Publication No. 10-1856026 (announced date: 2018.05.09.) discloses an automatic deployment tube for lifesaving and a drone carrying it. has been disclosed. This technology, the drone body; a rotorcraft flying means unit that generates lift by the rotational force of a propeller provided in the drone body and operates to fly in the air; An automatic deployment tube transport and delivery unit provided on the lower surface of the drone body to separate and drop the automatic deployment tube from the lower surface of the drone body at a preset height. a body portion coupled to the lower surface of the drone body; It is provided in the body part and includes a hanger part detachable from the tube bag and the release valve of the automatic deployment tube through a sliding operation, wherein the hanger part is slid in a first direction to separate the tube bag from the drone body. 1 cancer; a second arm sliding in a second direction to separate the release valve from the drone body; a gear motor connected between the first arm and the second arm; a first coupling part coupled to the first arm; and a second binding part coupled to the second arm, wherein the first arm and the second arm slide through the gear motor to have a time difference, and the automatically deploying tube is a lever according to gravity acceleration when dropped. Gas is injected inside through position change and automatically deployed.

According to such a lifesaving device, it was possible to expect the effect of using a plurality of self-deploying tubes for a plurality of victims by mounting a plurality of automatic deployment tubes on the drone.

In addition, as another prior art, Korean Patent Application Laid-Open No. 10-2011-0135569 (published on December 19, 2011) discloses an expandable and deployable structural tube. This technology is a hose that is expanded and deployed long by the injection of air; and an air injection device for injecting air into the hose, it could be expected that people in the sea rescue many people who are swept away by seawater by rip currents or coastal waves.

However, these prior arts have a problem in that it is difficult for a person in fear to easily grip the tube, and the tube that is separated from each other does not move and the victim must swim toward the tube.

Republic of Korea Patent Publication No. 10-1856026 (Announcement date: 2018.05.09.) Republic of Korea Patent Publication No. 10-2011-0135569 (published date: 2011.12.19.)

It is an object of the present invention, when a survivor occurs in an area where it is difficult for the rescued to approach, the unmanned moving body injects a buoyant body formed in a chain shape to surround the victim or place the buoyant body adjacent to the person in distress so that the victim can easily buoyancy body The purpose of this is to provide a means to quickly implement the rescue of the survivors by holding the buoyancy and towing the survivors holding the buoyancy body to a place where the rescued can access.

In addition, the problem to be solved by the present invention is not limited to the technical problems mentioned above, and other technical problems not mentioned are clearly to those of ordinary skill in the art to which the present invention belongs from the description below. can be understood

The above object, according to the present invention, a movable body; a lifesaving means having one end fixed to the bobbin unit provided on the movable body and wound up; and an ejection part formed so that the free end of the lifesaving means is selectively injected, wherein the lifesaving means includes: a buoyant body that is first injected from the ejection part; A plurality of connection buoyancy bodies connected in series to the starting point buoyancy body by the connection part; and a fluid supply unit for supplying a fluid from a fluid cartridge provided in each of the starting point buoyancy body and the connecting buoyancy body, and when the point point buoyancy body is injected, the starting point buoyancy body and the connection buoyancy body are filled with fluid to expand and deploy, the movable body This is achieved by a chain-type lifesaving system, characterized in that the movement of at least one or more survivors is surrounded.

The viewpoint buoyancy body includes a resistance member that spreads to receive resistance to the movement direction of the movable body in the water and is connected by a joint at regular intervals along the edge, and when the movable body moves, it prevents movement in water to prevent the viewpoint buoyancy The position of the sieve may be temporarily fixed so that the connecting buoyancy body may be drawn out from the bobbin unit.

The injection unit may include: a pair of first walls spaced apart so that the starting point buoyancy body and the connecting buoyancy body pass sequentially without twisting; a second wall connecting the first wall, but having a slit formed so that the connecting buoyancy body and the pin member are separated to open the fluid cartridge; and an elastic member provided in the first wall, which is extended by elastic recovery and comes in contact with a hard projectile formed at one end of the point-in-time buoyancy body to inject the point-in-time buoyancy body into the water surface.

The fluid cartridge is provided inside the starting point buoyancy body and the connecting buoyancy body, and the pin member is formed in a 'T' shape, and is coupled to the fluid cartridge in the starting point buoyancy body and the connecting buoyancy body, the When the starting point buoyancy body is injected from the injection unit, the pin member is caught by the slit and separated from the fluid cartridge, so that the starting point buoyancy body and the connecting buoyancy body are filled with a fluid.

The injection part may be formed to have a height of 1/2 or more of the height of the connecting buoyancy body.

The connection part is made of a length shorter than the width of the connecting buoyancy body, and may be made of a sheet having a predetermined width, or made of a net shape, or made of a bag shape.

The connecting buoyancy body may be formed in a form in which the plurality of folds are folded, and a surface area may be increased when the fluid is filled.

According to the present invention, it is possible to provide an effect of temporarily fixing the position of the viewpoint buoyancy body in water by the resistance means provided on the injection point buoyancy body.

In particular, the viewpoint buoyancy body is temporarily fixed and a plurality of connecting buoyancy bodies are drawn out as the moving body moves, thereby providing an effect of enclosing one or more victims or positioning them adjacent to the victims.

In addition, they are connected rather than individual buoyant bodies, so that it is possible to provide the effect of more easily gripping the survivors.

In addition, it is possible to provide the effect of shortening the rescue time by towing a person in a place where it is difficult for the evacuee to access to a place where the evacuee can access.

On the other hand, the effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description of the claims.

1 is a schematic diagram showing the configuration of a chain-type lifesaving system according to the present invention.
Figure 2 (a) is a plan view showing the life-saving means and the injection unit before the operation of the chain-type life-saving system according to Fig. 1 .
Figure 2 (b) is a side view showing the life-saving means and the injection unit before the operation of the chain-type lifesaving system according to Fig. 1 .
3 is an enlarged view showing a portion 'A' that is a fluid supply unit of FIG. 2 .
4 is a schematic view showing the operation of the resistance member of the chain-type lifesaving system according to FIG.
5 (a) and (b) are cross-sectional views showing before and after the fluid on the line B-B', the buoyancy body of FIG. 2 , is filled.
6 (a) and (b) are schematic views showing the use state of the chain-type lifesaving system according to FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, descriptions of already known functions or configurations will be omitted in order to clarify the gist of the present invention.

In addition, when it is said that a certain element is "connected" to another element, it may be directly connected to the other element, but it should be understood that another element may exist in the middle. On the other hand, when it is mentioned that a certain element is "directly connected" to another element, it should be understood that the other element does not exist in the middle.

In addition, the terms used herein are for the purpose of describing the embodiments and are not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, the terms 'comprises' and/or 'comprising' do not exclude the presence or addition of one or more other components.

In the chain-type lifesaving system 1 according to the present invention, when a person in distress occurs in an area where it is difficult for the rescued to access, the unmanned moving object 10 injects a chain-shaped connecting buoyancy body 140 to surround the person or By locating the connecting buoyancy body 140 adjacent to the person in distress, the person in distress easily grips the connecting buoyancy body 140, and the moving body 10 allows the rescuer to access the victim who holds the connecting buoyancy body 140 It is to quickly implement the rescue of the distressed by towing with

Among the accompanying drawings, FIG. 1 is a schematic diagram showing the configuration of a chain-type lifesaving system according to the present invention, and FIG. and, (b) of FIG. 2 is a side view showing the lifesaving means and the injection unit before operation of the chain-type lifesaving system according to FIG. 1 . In addition, Figure 3 is an enlarged view showing the fluid supply part 'A' part of Figure 2, Figure 4 is a schematic view showing the operation of the resistance member of the chain-type lifesaving system according to Figure 5, (a) and ( b) is a cross-sectional view showing before and after the fluid on the line B-B', which is the buoyancy body at the time of Fig. 2, is filled. In addition, (a) and (b) of Figure 6 is a schematic view showing the use state of the chain-type lifesaving system according to Figure 1 .

In addition, since the size and thickness of each component shown in the drawings are arbitrarily indicated for convenience of description, the present invention is not necessarily limited to the bar shown in the drawings, and is shown in schematic lines to clearly distinguish various parts and regions. or enlarged.

As shown in Figs. 1 to 6, in the chain-type lifesaving system 1 according to the present invention, when a survivor occurs in an area where it is difficult for the evacuee to access at sea, the movable body 10 moves to the area where the survivor is located. And the chain-shaped connecting buoyancy body 140 is injected and wrapped around the victim, and if the victim easily grips it, it can be rescued by towing. It is configured to include a life-saving means 100 that is wound, and an injection unit 200 formed so that the free end of the life-saving means 100 is selectively injected.

In the present invention, the movable body 10 is expressed as being made of an unmanned small ship, but it may be made of a drone or a manned mobile body. The mobile body 10 is connected to a central computer (eg, maritime control center, etc.) via a communication line and operates remotely or uses other known technologies (eg, GPS module, etc.) to determine the location and number of victims. can The present invention is for saving one or more survivors after that.

As shown in FIG. 1 , a bobbin unit 20 is provided on one side of the movable body 10 .

The bobbin unit 20 is a chain-type lifesaving means 100 wound therein, and the wick 24 connecting the heads 22 facing each other is installed on one side of the movable body 10 and is rotatably connected to save the life. The means 100 may be easily withdrawn.

The lifesaving means 100 is made of a long chain-like buoyancy bodies (the starting point buoyancy body 120 and the connecting buoyancy body 140) that are wound on the bobbin part 20 and then drawn out, and the first injection part ( 200) injected by the starting point buoyancy body 120, a plurality of connection buoyancy bodies 140 connected in a line to the starting point buoyancy body 120 by the connection part 130, and the starting point buoyancy body 120 and the connection buoyancy body It is configured to include a fluid supply unit 160 configured to supply fluid from the fluid cartridge 162 provided in each 140 .

The injection unit 200 is installed adjacent to the bobbin unit 20, as shown in FIGS. ) and the connecting buoyancy body 140 to guide the injection sequentially without twisting, and to fill the fluid inside the buoyancy body 120 and the connection buoyancy body 140 that were compressed by opening the fluid cartridge to help them expand , A pair of first walls 220 having a spaced apart, but connecting the first wall 220, the second wall formed with a slit 242 so that the pin member 164 is separated to open the fluid cartridge 162 240, and the hard projectile 246 formed at one end of the starting point buoyancy body 120 so as to be stretched by elastic recovery to eject the starting point buoyancy body 120 to the water surface, and provided on the first wall 220 It is configured to include an elastic member 244 in a compressed state.

In other words, the injection unit 200 has a '∪' shape in cross section, and the starting point buoyancy body 120 and the connecting buoyancy body 140 pass between the pair of first walls 220 (both side walls). .

The height of the injection unit 200 , that is, the height of the first wall 220 , preferably has a length of 1/2 or more of the width of the starting point buoyancy body 120 and the connection buoyancy body 140 . This is, when the point buoyancy body 120 and the connection buoyancy body 140 formed thinly of PVC (Poly Vinyl Chloride) material are injected or drawn out from the bobbin unit 20 and the injection unit 200, they can come out sequentially without twisting. be able to guide you.

A long slit 242 is formed in the second wall 240 (bottom wall), which is an external pin temporarily coupled with the fluid cartridge 162 located inside the starting point buoyancy body 120 and the connecting buoyancy body 140 . By separating the member 164, the fluid cartridge 162 is opened so that the fluid is filled in the inside (IN).

As shown in FIG. 3 , the fluid cartridge 162 located in the inside (IN) of the point buoyancy body 120 is compression-sealed by a sealing plate 161, and a guide member connected to the inlet of the fluid cartridge 162. The breaking pin 166 connected to the compression spring 168 having a compressive force by 163 is press-fitted with the pin member 164 with the sheet of the starting point buoyancy body 120 interposed therebetween. The pin member 164 having a 'T' shape passes through the slit 242 and is dropped from the fitting groove 165 of the breaking pin 166 at the dead end, and the breaking pin 166 is the compression spring 168 of the compression spring 168 . The sealing plate 161 of the fluid cartridge 162 is destroyed in an instant by the stretching force. At the same time, a high-pressure fluid (eg, CO2) filled in the fluid cartridge 162 is released to fill the inside IN of the point-in-time buoyancy body 120 . At this time, the guide member 163 may be formed with a plurality of through-holes through which the fluid can pass.

Even when the inside of the connecting buoyancy body 140 is filled with a fluid, it is filled in the above-described way.

In addition, the ejection unit 200, as shown in Figs. 2 (a) and (b), in order to shoot and export the viewpoint buoyancy body 120 to the water surface, the rigid formed at one end of the viewpoint buoyancy body 120 In contact with the projectile 246 , the elastic member 244 provided on the first wall 220 may be elongated and injected by elastic recovery.

The starting point buoyancy body 120 is provided at the free end of the lifesaving means 100, is in a firing (injection) standby state by the injection unit 200, and is operated by an electrical signal, that is, selectively movable body 10 ) is ejected in the opposite direction in which it moves.

Here, the meaning of “optionally” refers to automatically ejecting the viewpoint buoyancy body 120 when the mobile body 10 starts to rescue the survivor. When the movable body 10 is a manned movable body, it may be manually operated.

As an example of injecting the viewpoint buoyancy body 120 from the injection unit 200, as shown in the enlarged view of Fig. 2 (b), the rotating plate 249 rotatably coupled by the rotating shaft 248 is The projectile 246 may be ejected by forcibly stopping the movement of the projectile 246 and automatically rotating the rotating plate 249 . For example, the rotating plate 249 may be rotated by an actuator provided on the first wall 220 to operate with an electrical signal to eject the projectile 246 . In addition, the projectile 246 may be ejected by selectively triggering the hook member in a state in which the projectile 246 is hooked and fixed with a hook member controlled by the actuator.

As shown in (a) and (b) of Figure 5, the inside (IN) of the starting point buoyancy body 120 and the connecting buoyancy body 140 is made in a closed state, a plurality of folds are formed in a folded form can be This is so that the fluid occupies a small area in a compressed state before being filled, but increases the surface area in a state in which the fluid is filled and expanded.

On the other hand, the viewpoint buoyancy body 120 may include a resistance member 122 that is spread out to receive resistance to the movement direction of the movable body 10 in water and is connected by a joint at regular intervals along the edge.

The resistance member 122 prevents the movement in the water when the movable body 10 moves so that the position of the starting point buoyancy body 120 is temporarily fixed in the water so that the connection buoyancy body 140 is easily drawn out from the bobbin part 20 . it is to do

This point of view buoyancy body 120 may be made of a conventional wind anchor (aka, water anchor or sea anchor - sea anchor).

As shown in FIG. 4, when the starting point buoyancy body 120 is injected into the water surface, when the movable body 10 moves in the ① direction, a resistance force is generated in the ② direction so that the starting point buoyancy body 120 is the bobbin part 20. It will pull the connecting buoyancy body 140 wound on the.

The connection part 130 is made of a length shorter than the width length of the connection buoyancy body 140, and may be made of a sheet surface or a net shape. This is for easy gripping of the survivors, and also to prevent kinking. A two-dimensional surface having an area is easier to grip than a one-dimensional line such as a rope, and kinking is prevented.

That is, the connection part 130 may be formed of a sheet having a predetermined width, a sheet having a width, a net shape, or a bag shape.

A rescue method using the chain-type lifesaving system 1 configured as described above will be described as follows.

In a state in which the moving object 10 is on standby, information on the occurrence of a distress and the location of the distress is obtained by the means for determining the location of the occurrence of a distress and the location of the person in distress.

When a distress signal is received through the above-described process and information on the location and number of victims is received, the control unit provided in the mobile body 10 operates and controls the mobile body 10 to move directly to the distress position.

When the moving object 10 arrives at the position where the distress occurs, the control unit injects the viewpoint buoyancy body 120 at a position maintaining a predetermined distance from the distressed person. That is, when the actuator rotates the rotating plate 249 by an electrical signal, the projectile 246 is injected into the water surface by the elastic recovery force of the elastic member 244 .

When the projectile 246 is ejected, the pin member 164 is caught by the slit 242 to release the fixation with the destructive pin 166, so the fluid cartridge 162 is opened to the inside of the point-of-point buoyancy body 120 The fluid is filled.

The connection buoyancy body 140 is continuously drawn out by the injection of the above-described point buoyancy body 120 . That is, when the position of the starting point buoyancy body 120 is temporarily fixed by the resistance member 122 of the starting point buoyancy body 120 injected into the water surface, the connection buoyancy body 140 is withdrawn from the bobbin unit 20, and each As the connecting buoyancy body 140 passes through the injection unit 200 , the pin member 164 is caught by the slit 242 to open the fluid cartridge 162 .

In this way, since the starting point buoyancy body 120 is injected and the fluid cartridge 162 is opened when each connection buoyancy body 140 is withdrawn by the injection of the starting point buoyancy body 120, the starting point buoyancy body 120 and the connection buoyancy body 120 The sieve 140 may be expanded and deployed by filling with a fluid.

On the other hand, in the state in which the starting point buoyancy body 120 and the connecting buoyancy body 140 are injected and withdrawn and expanded, the movable body 10 surrounds at least one or more survivors as shown in FIG. , as shown in Fig. 6 (b), it can move adjacent to a number of survivors.

In this expanded state, while towing the connecting buoyancy body 140 connected to each other, it surrounds the person in distress, so that the victim can quickly and easily grip the connecting buoyancy body 140 .

And, the movable body 10 surrounds the person in distress or moves across the direction in which the person in distress moves by the current or wave and injects the connection buoyancy body 140 as described above to facilitate the connection buoyancy body 140 can be made to hold

When the survivor grips the connecting buoyancy body 140 through the above-described process, the mobile body 10 can tow to a place where the evacuee can access or a less dangerous place, and can maintain that state until the wired rescue boat arrives. .

As described above, according to the chain-type lifesaving system 1 according to the present invention, by the resistance means (resistance member 122) provided in the initial injection point buoyancy body 120, the point of view buoyancy body 120 in water Since the position of the buoyancy body 140 connected to each other is temporarily fixed, the connection buoyancy body 140 connected to each other can be continuously withdrawn, and in particular, the point buoyancy body 120 and the connection buoyancy body 140 are withdrawn and expanded with fluid supply to provide buoyancy. In particular, as the starting point buoyancy body 120 is temporarily fixed and the movable body 10 moves, a plurality of connection buoyancy bodies 140 are drawn out to surround one or more survivors or to be positioned adjacent to the survivors. In the event of an outbreak, it is possible to quickly rescue the survivors.

In addition, since each of the connecting buoyancy bodies 140 are connected to each other rather than an individual buoyancy body, not only can the victim more easily grip, but also the person in distress who moves by a current or wave can easily grip it.

In addition, it is possible to shorten the rescue time by towing a person in a place where it is difficult for the evacuee to access to a place where the evacuee can access.

In addition, the chain-type lifesaving system 1 according to the present invention has the technical characteristics described in the present invention, and can be made in various shapes, shapes, standards, etc., as well as a mixture of the above-mentioned configurations. may be

In the foregoing, specific embodiments of the present invention have been described and illustrated, but it is common knowledge in the art that the present invention is not limited to the described embodiments, and that various modifications and variations can be made without departing from the spirit and scope of the present invention. It is self-evident to those who have Accordingly, such modifications or variations should not be individually understood from the technical spirit or point of view of the present invention, and the modified embodiments should belong to the claims of the present invention.

1: Chain type lifesaving system
10: moving object
20: bobbin part
22: head
24 : wick
100: lifesaving means
120: point of view buoyancy body
122: resistance member
130: connection part
140: connection buoyancy body
160: fluid supply unit
161: sealing plate
162: fluid cartridge
163: guide member
164: pin member
165: fitting groove
166: destruction pin
168: compression spring
200: injection part
220: first wall
222 : leg
230: entrance area
240: second wall
242: slit
244: elastic member
245: second groove
246 : projectile
247: first groove
248: axis of rotation
249: rotating plate

Claims (7)

moving body;
a lifesaving means having one end fixed to the bobbin unit provided on the movable body and wound up; and
and an injection part formed so that the free end of the lifesaving means is selectively injected,
The lifesaving means is
a buoyant body that is first injected from the injection unit;
A plurality of connection buoyancy bodies connected in series to the starting point buoyancy body by the connection part;
A fluid supply unit for supplying a fluid from a fluid cartridge provided in each of the starting point buoyancy body and the connecting buoyancy body,
When the starting point buoyancy body is injected, the fluid is filled in the starting point buoyancy body and the connecting buoyancy body to expand and unfold, characterized in that it surrounds at least one or more victims by the movement of the movable body,
Chain type lifesaving system. According to claim 1,
The point in time buoyancy body,
It spreads to receive resistance to the movement direction of the moving body in the water and includes a resistance member connected by a joint at regular intervals along the edge,
When the movable body moves, the position of the starting point buoyancy body is temporarily fixed by interfering with the movement in water so that the connection buoyancy body is drawn out from the bobbin part, characterized in that,
Chain type lifesaving system. 3. The method of claim 2,
The ejection unit,
A pair of first walls having a spacing so that the starting point buoyancy body and the connecting buoyancy body pass sequentially without twisting;
a second wall connecting the first wall, but having a slit formed so that the connecting buoyancy body and the pin member are separated to open the fluid cartridge; and
It is extended by elastic recovery and is in contact with a hard projectile formed at one end of the starting point buoyancy body to eject the starting point buoyancy body to the water surface, characterized in that it includes an elastic member provided on the first wall,
Chain type lifesaving system. 4. The method of claim 3,
The fluid cartridge,
It is provided inside the starting point buoyancy body and the connecting buoyancy body,
The pin member is
It is formed in a 'T' shape, and is coupled to the fluid cartridge inside the starting point buoyancy body and the connection buoyancy body,
When the starting point buoyancy body is injected from the injection unit, the pin member is caught by the slit and separated from the fluid cartridge, characterized in that the fluid is filled in the starting point buoyancy body and the connecting buoyancy body,
Chain type lifesaving system. 4. The method of claim 3,
The ejection unit,
Characterized in that it is formed to a height of 1/2 or more of the height of the connecting buoyancy body,
Chain type lifesaving system. According to claim 1,
The connection part,
Consisting of a length shorter than the width of the connecting buoyancy body, characterized in that it is made of a sheet having a predetermined width, made in a net form, or in a bag form,
Chain type lifesaving system. According to claim 1,
The connecting buoyancy body,
The plurality of folds are formed in a folded form, characterized in that the surface area is widened when the fluid is filled,
Chain type lifesaving system.

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