KR100717155B1 - Airtight Vessel Having Device for exhausting air - Google Patents

Abstract

As the air inside is discharged to the outside, air remaining in the inside is removed, and a sealed container in which a vacuum pressure is formed therein is provided.

The sealed container according to the present invention, the main body is formed in a concave shape so that the opening is formed on one side; A cover made of a material having elasticity, coupled to the main body to cover the opening, and having at least one air inlet and at least one air outlet formed at a portion corresponding to the opening; And an expansion part which is coupled to the lower side of the cover to cover the lower end of the air inlet and expands as the air enters the inside, and the first packing for discharging the air inside the body through the air outlet. And an air discharge means including a second packing for introducing external air into the expansion part.

Therefore, the closed container provided with the air discharge means according to the present invention, it is possible to more easily form and release the vacuum pressure inside the container, by discharging all the air in the container so that no air remaining inside the container inside the container There is an advantage that can prevent the deterioration and decay of the received material.

Airtight, Container, Air, Exhaust, Packing, Expansion

Description

Airtight Vessel Having Device for Exhaust Air

1 is a cross-sectional view of a conventional hermetic container.

2 is an exploded perspective view of a first embodiment of a hermetically sealed container according to the present invention.

3 is a sectional view of a first embodiment of a hermetically sealed container according to the present invention.

4 to 6 are cross-sectional views sequentially showing examples of use of the sealed container first embodiment according to the present invention.

7 is an exploded perspective view of a second embodiment of a hermetically sealed container according to the present invention.

8 is a sectional view of a second embodiment of a hermetically sealed container according to the present invention.

9 to 11 are cross-sectional views sequentially showing examples of use of the second embodiment of the sealed container according to the present invention.

It is sectional drawing which shows 3rd Example of the airtight container which concerns on this invention.

<Description of the symbols for the main parts of the drawings>

100: body 200: cover

300: air discharge means 310: first packing

312: first sealing plate 314: first pillar

316: first locking projection 320: second packing

322: second sealing plate 324: second pillar

326: second projection 328: the support plate

329: vent 330: inflation

340: first bracket 350: second bracket

The present invention relates to a hermetically sealed container, and more particularly, to a hermetically sealed container for preventing the deterioration and decay of the contents contained in the container by drawing air to the outside.

In general, when food or cooked food is stored in a wrap or plastic paper and stored in a freezer, such as a refrigerator, such a storage method can be stored for a predetermined period of time, but in the long run the inside of the wrap or plastic paper Due to the air in the food and food is oxidized and decayed, there was a problem that it is difficult to store for a long time.

In addition, the conventional food container has a problem that can not be stored for a long time because the food in the container is easily deteriorated due to bacterial propagation as a structure to simply put the food in the storage container and cover only the lid.

In order to solve the above problem, a sealed container (Utility Model Registration No. 218773) has been proposed.

Hereinafter, a conventional sealed container will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a conventional hermetic container.

As shown in FIG. 1, the conventional hermetic container 1 includes a container body 3 and a lid 5 coupled to cover an opening of the container body 3, and the lid 5 has a periphery. A receiving groove 7 recessed from the inner plate surface along the direction to receive the opening end of the container body 3 is formed, and protrudes toward the inner side at the side of the receiving groove 7 facing the central region of the lid 5. Protruding portion 9 is formed along the circumferential direction of the lid (5), the packing 10 is attached to the inner surface of the protrusion 9, a portion of the protrusion bonded to the protruding portion 9 along the width direction.

In addition, a through hole penetrating the lid 5 is formed in the central region of the lid 5, and a sealing cap 15 for sealing the sealed container 1 is installed in the through hole. The edge portion is provided with a date display for displaying the food receiving time in the container (1), the sealing cap 15 is formed with a lid 17 and the cap knob 16, the lid ( A close contact portion 18 is formed at the lower portion of the contact hole 17 to be in close contact with the through hole, and a close contact release portion 19 having a predetermined distance from the through hole is formed at the lower portion of the close contact portion 18. The lower portion of the portion 19 is formed with a plurality of engaging wings 20 are disposed radially around the axis of the sealing cap 15.

In order to store food in a vacuum state using the conventional hermetic container 1, the edge of the container body 3 is accommodated in the receiving groove 7 in the state in which the food is accommodated in the container body 3 first. The lid 5 to the container body 3 so that the packing 10 of the lid 5 contacts the inner surface of the container body 3, and then presses the sealing cap 15 downward to seal the sealing body. The close contact portion 18 of the cap 15 is brought into close contact with the through hole.

At this time, when the sealing cap 15 is pressed downward, the air in the sealed container 1 is partially discharged through the space between the close contact release part 19 and the through hole at the same time, and the close contact part 18 The through-hole is in close contact with the container (1) is to be closed, on the contrary, when pulling the sealing cap 15 in order to open the closed container (1), the close contact portion 18 from the through-hole Spaced apart so that the close contact portion 19 and the through hole is parallel, so that as much air discharged into the space between the close contact release portion 19 and the through hole flows back into the sealed container 1 and the lid ( 5) is to be separated from the container body (3).

However, the conventional hermetic container 1 which discharges air by using the close contact portion 18 and the close contact release portion 19 formed on the closed cap 15 as described above is between the close contact portion 18 and the through hole. When the friction force is generated in the air discharge is not carried out, in order to discharge the air through the through-hole, the entire closed cap 15 must be spaced apart from the through-hole, there is a difficulty in air discharge.

In the conventional hermetic container 1 having the above-described configuration, since only a part of the air inside the container 1 is discharged, contents such as food and the like produced by breeding bacteria by the air remaining in the container 1 are contained. There is a problem that it can be oxidized.

The present invention has been proposed to solve the above problems, by discharging all the air in the container so that air does not remain in the container, so that the material contained in the container does not deteriorate or decay, the packing is a lid It is an object to provide a hermetically sealed container which is less likely to be separated from, damaged or broken from.

As one technical aspect to achieve the above object, the present invention, the main body is formed in a concave shape so that the opening is formed on one side; and deformed by the force applied by the user and the elasticity to be restored when the applied force is removed A cover formed of a material having a material, coupled to the main body to cover the opening, and having at least one air inlet and at least one air outlet formed at a portion corresponding to the opening; And an expansion part which is coupled to the lower side of the cover to cover the lower end of the air inlet and expands as the air enters the inside, and discharges the air inside the main body through the air outlet. 1 an air discharge means including a packing and a second packing for introducing outside air into the inflation portion,
The cover may include a first coupler formed around the air outlet, a second coupler formed around the air inlet, and the first packing may include a first strut coupled to pass through the first coupler. And a first sealing plate covering and sealing the outer inlet of the air outlet, wherein the second packing includes a second strut coupled to pass through the second coupling hole, and an inner inlet of the air inlet. Provided is a sealed container including a second sealing plate that is covered and sealed.

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The cover is formed of a material in which a portion where the second coupler and the air inlet are formed is concave toward the inside of the main body, and the gas is passed through and the liquid is not passed to cover the second coupler and the air inlet. It further comprises a vent sheet to be combined.

At this time, the vent sheet is preferably coupled to be spaced apart from the second coupler and the air inlet.

In addition, the present invention as another technical aspect, the body is formed in a concave shape so that the opening is formed on one side; and made of a material having elasticity so as to be restored when the force applied by the user is deformed by the force applied by the user, A cover coupled to the main body to cover the opening, wherein at least one air inlet and at least one air outlet are formed at a portion corresponding to the opening; And an expansion part which is coupled to the lower side of the cover to cover the lower end of the air inlet and expands as the air enters the inside, and discharges the air inside the main body through the air outlet. 1 an air discharge means including a packing and a second packing for introducing outside air into the inflation portion,
The cover may include a first bracket having a first coupling hole formed around the air outlet, covering an inner inlet of the air outlet, spaced apart from the air outlet by a predetermined distance, and having a first through hole provided at one side thereof; And a second bracket covering an inner inlet of the air inlet and spaced apart from the air inlet by a predetermined distance, and having a second through hole provided at one side thereof, wherein the first packing is located inside the first bracket. And a first support base coupled to penetrate the first coupling hole, and a first sealing plate covering and sealing the inner inlet of the first through hole, wherein the second packing is inside the second bracket. Located in, provides a closed container configured to include a second sealing plate covering and closing the inner inlet of the air inlet.

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In this case, the second packing further includes a support plate seated on the bottom of the second bracket to guide the position of the second sealing plate. At this time, one or more vent holes are formed in the support plate.

The first sealing plate and the second sealing plate are formed to have a gradient in a direction closer to the cover as the surface in contact with the cover toward the outer end.

In addition, the first sealing plate and the second sealing plate is formed in a shape that becomes thinner toward the outer end.

Preferably, the inflation portion is made of any one material of pleated vinyl or elastic rubber or silicone pad.

In addition, the expansion unit is coupled to the cover in a removable structure. At this time, the cover is provided with a first removable bracket over all the points coupled to the expansion portion, the expansion portion is provided with a second removable bracket coupled to the removable structure with the first removable bracket around the edge or the edge.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a closed container having an air discharge means according to the present invention.

2 is an exploded perspective view of the first embodiment of the hermetically sealed container, and FIG. 3 is a cross-sectional view of the first embodiment of the hermetically sealed container.

As shown in FIG. 2 and FIG. 3, the sealed container according to the present invention includes a main body 100 formed in a concave shape with an opening formed at an upper side thereof so as to contain an accommodation therein, and the main body covering the opening. Cover 200 is coupled to the 100, and the cover 200 is configured to include an air discharge means 300 configured to discharge the air inside the main body 100 to the outside.

The cover 200 is made of a material having elasticity such as synthetic resin so as to be restored when the applied force is deformed by the force applied by the user, and at least one air inlet 222 and at least one air outlet 212 are provided. The sealing packing 230 is formed at a portion corresponding to the opening and coupled to the main body 100.

In addition, the air discharge means 300 is coupled to the lower side of the cover 200 to cover the lower end of the air inlet 222 is expanded portion 330 is expanded as the air flows into the inside and The first packing 310 for discharging the air in the main body 100 to the outside through the air outlet 212, and the second packing 320 for introducing the external air into the expansion part 330. It is configured to include.

Therefore, when the user presses down the outer surface of the cover 200, the cover 200 is bent so that the central part sags downward, thereby reducing the internal space of the main body 100, the main body by the internal space volume of the reduced main body 100 Air inside the 100 is discharged to the outside of the main body 100 through the air inlet. When the discharge of air through the air inlet is completed, the sealing plate covers the air inlet to prevent the air from outside the main body 100 to enter the main body 100. When the air discharge operation is repeated several times, a vacuum pressure is formed inside the main body 100, and thus, the bonding force between the main body 100 and the cover 200 is strengthened, and the contents contained in the main body 100 leak out. Not only that, but also to prevent the corruption of the contents.

The structure and function of the first picking, the second packing 320 and the expansion part 330 will be described in detail with reference to the accompanying drawings of use examples.

The cover 200 has a first coupler 210 formed around the air outlet 212 and a second coupler 220 formed around the air inlet 222.

The first packing 310 is coupled to the upper end of the first strut 314 and the first strut 314 coupled to penetrate the first coupler 210, and an outer inlet of the air outlet 212. The first sealing plate 312 to cover the seal and the first support stand 314 is coupled to the lower end of the first support stand 314 so as not to be separated from the first coupler 210 to act as a stopper 1 is configured to include a locking projection (316). In addition, the second packing 320 is coupled to the lower end of the second support post 324 and the second support post 324 coupled to penetrate the second coupling hole 220, and an inner inlet of the air inlet 222. The second sealing plate 322 to cover the sealing and the second support stand 324 is coupled to the upper end of the second support stand 324 so as not to be separated from the second coupler 220 to act as a stopper It is configured to include two locking projections (326).

The first packing 310 is slidably coupled along the first coupler 210 so that when the bottom surface of the first sealing plate 312 covers the air outlet 212, the air outlet 212 is sealed, and The second packing 320 is slidably coupled along the second coupler 220 so that the air inlet 222 is closed when the upper surface of the second sealing plate 322 covers the air inlet 222.

Therefore, when the air pressure inside the main body 100 increases, the air inside the main body 100 may be discharged to the outside after lifting up the first sealing plate 312 through the air outlet 212, but the pressure of the outside air is increased. In this case, since the air outlet 212 is sealed by the first sealing plate 312 as the first sealing plate 312 is pushed down, the outside air cannot be introduced into the main body 100. In addition, when the pressure of the outside air is increased, the outside air may be pushed down the second sealing plate 322 through the air inlet 222 and then introduced into the expansion part 330, but inside the expansion part 330. When the air pressure increases, the air inlet 222 is sealed by the second sealing plate 322 as the second sealing plate 322 is pushed upward, so the air inside the expansion part 330 may be discharged to the outside. none.

At this time, the first sealing plate 312 and the second sealing plate 322 to cover the air outlet 212 and the air inlet 222 more effectively, the cover in contact with the cover 200 toward the outer end of the cover It has a gradient in the direction closer to 200, it is preferable to be formed in a shape that becomes thinner toward the outer end.

4 to 6 are cross-sectional views sequentially showing examples of use of the sealed container first embodiment according to the present invention.

As shown in FIG. 4, when the user presses down the outer surface of the cover 200 to increase the air pressure inside the main body 100, as described above, the air inside the main body 100 is the first packing 310. After pushing up) is discharged to the outside through the air outlet (212).

When the force pushing down the cover 200 is removed, the cover 200 is restored so that the center is raised upward by its elasticity. In this case, the space inside the inflating part 330 is instantaneously inflated, thereby The air will have a lower pressure than the outside air. Therefore, the outside air is pushed down the second packing 320 and then introduced into the expansion part 330 through the air inlet 222. As air flows into the expansion part 330 as described above, the expansion part 330 expands in volume, thereby increasing the pressure of air existing outside the expansion part 330 in the body 100.

As described above, when the cover 200 is pressed down while the pressure of the air existing outside the expansion part 330 is increased in the main body 100, the air inside the main body 100 has a higher pressure. Since it is more smoothly discharged to the outside of the main body 100.

When the cover 200 is repeatedly pressed and released as shown in FIGS. 4 and 5, the expansion part 330 gradually expands to fill the inside of the main body 100, and as shown in FIG. 6, the expansion part ( When the 330 fills the inside of the main body 100, all the air existing in the main body 100 is discharged to the outside. Therefore, the food (F) accommodated inside the main body 100 is not in contact with the air, so that it does not deteriorate or decay. In this state, when the vacuum in the main body 100 is to be released, the first air sealing plate 312 is flipped so that the air discharge port 212 is opened, and the outside air is introduced into the main body 100.

At this time, the expansion unit 330 is preferably made of a material having excellent elasticity, such as pleated vinyl or rubber or silicone pad having elasticity to be easily expanded by the air flowing into the inside.

7 is an exploded perspective view of a second embodiment of a hermetically sealed container, and FIG. 8 is a cross-sectional view of a second embodiment of the hermetically sealed container.

As shown in FIG. 7 and FIG. 8, the cover 200 has a first coupler 210 formed around the air outlet 212, and covers an inner inlet of the air outlet 212 and has an air outlet ( 212 and the first bracket is formed to be spaced apart a predetermined interval and the first through-hole is provided on the bottom surface, covering the inner inlet of the air inlet 222 and formed to be spaced apart from the air inlet 222 by a predetermined interval It may be configured to include a second bracket that is provided with a second through-hole on the surface. In the present embodiment, the first through hole and the second through hole are provided on the bottom surface of the first bracket and the second bracket, respectively, but the positions of the first through hole and the second through hole are freely changed according to the shape of each packing and the user's convenience. Can be.

In this case, the first packing 310 is coupled to the lower end of the first support post 314 coupled to penetrate the first coupling hole 210 and the first support post 314 to be located inside the first bracket. 1 is coupled to the upper end of the first sealing plate 312 and the first holding plate 314 to cover the inner inlet of the through hole and the first holding plate 314 is not completely separated from the first coupling hole 210 It is configured to include a first locking projections 316 to serve as a stopper. At this time, the cover 200 is preferably formed in a concave point where the first locking projection 316 is located so that the first locking projection 316 does not protrude from the outer surface of the cover 200.

In addition, the second packing 320 is located inside the second bracket and guides the position of the second sealing plate 322 and the second sealing plate 322 to cover and seal the inner inlet of the air inlet 222. In order to further include a support plate 328 which is seated on the bottom of the second bracket, and the second holding plate 324 for connecting the second sealing plate 322 and the support plate 328.

At this time, it is preferable that one or more vent holes 329 are formed in the support plate 328 such that the air introduced into the air inlet 222 can be smoothly introduced into the expansion part 330 through the second through hole. .

When each packing is configured according to the second embodiment shown in FIGS. 9 and 10, each packing 310 and 320 may be separated from the cover 200 since all or most of the packings are located inside the cover 200. And does not protrude outward from the outer surface of the cover 200, so there is no risk of being damaged or broken.

9 to 11 are cross-sectional views sequentially showing examples of use of the second embodiment of the sealed container according to the present invention.

As shown in FIG. 9, when the user presses down the center portion of the cover 200 and the air pressure inside the main body 100 increases, the air inside the main body 100 passes through the first through hole as described above. It is drawn into the first bracket to push up the first packing 310 and is discharged to the outside through the air outlet 212.

In addition, when the force applied to the cover 200 is removed, as in the case of the first embodiment, the cover 200 is restored to a flat state as shown in FIG. 10, whereby the outside air is removed through the air inlet 222. 2, the packing 320 is lowered and introduced into the second bracket, and then introduced into the expansion part 330 through the vent hole 329 and the second through hole.

As the operations illustrated in FIGS. 9 and 10 are repeated, the expansion unit 330 is expanded to fill the inside of the main body 100 as shown in FIG. 11. In this state, when the user wants to release the pressure inside the body 100, the user grabs the first locking protrusion 316 and lifts it up to allow the outside air to flow into the body 100.

Since the operation and function of each packing and expansion unit 330 as described above is the same as the operation and function of each packing and expansion unit 330 shown in the first embodiment, a detailed description thereof will be omitted.

It is sectional drawing which shows 3rd Example of the airtight container which concerns on this invention.

As shown in FIG. 12, the cover 200 has a portion where the second coupler 220 and the air inlet 222 are formed to be concave toward the inside of the main body 100, and the concave portion, that is, the A vent sheet 250 coupled to the upper surface of the cover 200 may be further provided to cover a portion where the second coupler 220 and the air inlet 222 are formed.

Ventilation sheet 250 is made of a material that the gas passes through, but not through the liquid, the outside air may be introduced into the expansion unit 330 through the air inlet 222, but the external liquid is expanded ( 330 may not flow inside. Therefore, even when the cover 200 is put into water or washed, water or foreign matter does not flow into the expansion part 330.

As described above, the gas-permeable sheet 250 is configured such that the gas passes through the liquid, and the liquid does not pass through the container, so that the container containing various chemicals or chemicals does not swell or crush due to external environmental changes such as temperature or pressure. Packaging vents that block the inlet of the container to prevent leakage or contamination of the container or medical vents that are attached to cover the wound and block permeation of dust or pathogens of the wound and allow air or water vapor to heal faster Since it is commercially available in many fields, such as a detailed description thereof will be omitted.

In this case, the vent sheet 250 is preferably coupled to the second coupler and the air inlet spaced apart by a predetermined interval so that the second packing 320 can be spaced up and down by a predetermined interval for opening and closing the air inlet 222. Do.

In addition, the expansion unit 330 is coupled to the cover 200 in a removable structure. At this time, the cover 200 is provided with a first removable bracket 240 having a closed curve or polygonal shape so as to cover all the points coupled to the expansion portion 330, the expansion portion 330 is the expansion portion 330 A second detachable bracket 332 coupled to the first detachable bracket 240 and a detachable structure is provided to seal the inside and the outside thereof.

A detachable opening 242 having a narrow inlet is formed on a bottom of the first detachable bracket 240, and a detachable protrusion 334 coupled to the detachable opening 242 on an upper surface of the second detachable bracket 332. Is provided, the detachable protrusion 334 is inserted into the detachable opening 242, the first detachable bracket 240 and the second detachable bracket 332 is coupled to each other. In this embodiment, the detachable opening 242 is formed in the first detachable bracket 240, and the detachable protrusion 334 is formed in the second detachable bracket 332, but the detachable opening 242 and the detachable protrusion ( The position at which the 334 is formed is not limited thereto and may be interchanged.

In addition, as shown in FIG. 12, the second detachable bracket 332 may be provided at the edge end of the expansion part 330 or may be provided around the edge.

As such, when the expansion part 330 is configured to be detachable from the cover 200, only the expansion part 330 can be replaced when the expansion part 330 is damaged, and when the inside of the expansion part 330 is contaminated. It has the advantage of being able to be cleaned and disinfected.

As mentioned above, although this invention was demonstrated in detail using the preferable embodiment, the scope of the present invention is not limited to a specific embodiment, Comprising: It should be interpreted by the attached Claim. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

The closed container provided with the air discharge means according to the present invention can more easily form and release a vacuum pressure inside the container, and by discharging all the air inside the container so that no air remains inside the container, There is an advantage that can prevent the deterioration and decay of the received material.

In addition, the airtight container provided with the air discharge | emission means by this invention has the advantage that there is little possibility that a packing may be separated from a lid, or it may be damaged or broken.

Claims (12)

delete The main body 100 is formed in a concave shape to form an opening on one side; And made of a material having elasticity so as to be restored when the force applied by the user is deformed by the force applied by the user is removed, the main body to cover the opening ( A cover 200 coupled to 100 and having at least one air inlet 222 and at least one air outlet 212 formed at a portion corresponding to the opening; And an expansion part 330 that is coupled to a lower side of the cover 200 to cover the lower end of the air inlet 222 and expands in volume as air is introduced therein, and the air outlet 212. Air discharging means 300 including a first packing 310 for discharging the air in the main body 100 to the outside and a second packing 320 for introducing external air into the expansion unit 330 ), The cover 200 has a first coupler 210 formed around the air outlet 212, a second coupler 220 formed around the air inlet 222, and the first packing 310. ) Is configured to include a first strut 314 coupled to penetrate the first coupler 210 and a first sealing plate 312 covering and sealing the outer inlet of the air outlet 212. The second packing 320 may include a second support 324 coupled to penetrate the second coupling hole 220, and a second sealing plate covering and sealing an inner inlet of the air inlet 222. 322) comprising a closed container. The method of claim 2, The cover 200, The second coupler 220 and the air inlet 222 forming portion is formed to be concave toward the inside of the main body 100, the gas is passed through the liquid is not passed through the second coupler ( 220) and a closed container further comprises a vent sheet 250 coupled to cover the air inlet 222. The method of claim 3, wherein The vent sheet 250 is sealed container characterized in that coupled to be spaced apart from the second coupler 220 and the air inlet 222 by a predetermined interval. The main body 100 is formed in a concave shape to form an opening on one side; And made of a material having elasticity so as to be restored when the force applied by the user is deformed by the force applied by the user is removed, the main body to cover the opening ( A cover 200 coupled to 100 and having at least one air inlet 222 and at least one air outlet 212 formed at a portion corresponding to the opening; And an expansion part 330 that is coupled to a lower side of the cover 200 to cover the lower end of the air inlet 222 and expands in volume as air is introduced therein, and the air outlet 212. Air discharging means 300 including a first packing 310 for discharging the air in the main body 100 to the outside and a second packing 320 for introducing external air into the expansion unit 330 ), The cover 200 has a first coupler 210 formed around the air outlet 212, covering the inner inlet of the air outlet 212 and spaced apart from the air outlet 212 by a predetermined distance. And a first bracket having a first through hole provided at one side thereof, covering an inner inlet of the air inlet 222 and spaced apart from the air inlet 222 by a predetermined distance, and having a second through hole provided at one side thereof. It is configured to include two brackets, the first packing 310, the first support base 314 is coupled to pass through the first coupler 210, and is located in the first bracket and the first And a first sealing plate 312 covering and sealing the inner inlet of the through hole, and the second packing 320 is located inside the second bracket and covers the inner inlet of the air inlet 222. It characterized in that it comprises a second sealing plate 322 for sealing Waste containers. The method of claim 5, The second packing (320) further comprises a support plate (328) seated on the bottom of the second bracket to guide the position of the second sealing plate (322). The method of claim 6, The support plate 328 is a sealed container, characterized in that at least one vent hole (329) is formed. The method according to any one of claims 2 to 7, The first sealing plate 312 and the second sealing plate 322, Sealed container characterized in that the surface in contact with the cover 200 is formed to have a gradient in the direction closer to the cover 200 toward the outer end. The method according to any one of claims 2 to 7, The first sealing plate 312 and the second sealing plate 322, A sealed container characterized in that it is formed in a shape that becomes thinner toward the outer end. The method according to any one of claims 2 to 7, The expansion unit (330) is a closed container, characterized in that made of any one material of the pleated vinyl or elastic rubber or silicone pad. The method according to any one of claims 2 to 7, The expansion unit (330) is sealed container, characterized in that coupled to the cover 200 in a removable structure. The method of claim 11, wherein The cover 200 is provided with a first removable bracket 240 over all the points that are combined with the expansion portion 330, The expansion part 300 is a sealed container, characterized in that the second removable bracket 332 coupled to the removable structure with the first removable bracket 240 is provided around the edge or the edge.

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