KR20050093077A - Vacuum cover - Google Patents

Abstract

The present invention relates to a vacuum cover to maintain the freshness of food for a long time, and more particularly through a protective cap covering the check valve provided in the vacuum cover body to prevent the check valve from opening when undesired and opening of the check valve The present invention relates to a vacuum cover that facilitates the operation and improves the reliability of the vacuum state and the convenience of the cover opening operation.

Vacuum cover according to the invention the main body; A packing member provided at the bottom of the main body; A check valve installed in the main body; A lever coupled to an upper portion of the check valve; A protective cap positioned on the main body to cover the check valve; And provided in the protective cap, it comprises an opening and closing opening for opening the check valve by pressing the lever.

Description

Vacuum Cover {VACUUM COVER}

The present invention relates to a vacuum cover to maintain the freshness of food for a long time, and more particularly through a protective cap covering the check valve provided in the vacuum cover body to prevent the check valve from opening when undesired and opening of the check valve The present invention relates to a vacuum cover that facilitates the operation and improves the reliability of the vacuum state and the convenience of the cover opening operation.

Vacuum cover is for storing foods such as foods, fruits, vegetables, etc., by evacuating and evacuating the air inside the main body of the cover or other containers to reduce the temperature change in the cover and decay of food or air caused by microorganisms contained in the air By preventing oxidation due to chemical reactions with the particles, the shelf life of the stored food can be extended and freshness can be maintained.

The development of the conventional vacuum cover has focused on the development of a packing means for maintaining the airtightness by effectively blocking the inside and the outside of the cover during the vacuuming process and after the vacuum process and how efficient and easy to vacuum.

According to the air pumping method can be classified into a method using a vacuum cover and a method using a pump. The former uses the elasticity of the cover material itself to pressurize the cover body toward the bottom in the state where the check valve is opened to discharge the air inside the cover and then close the check valve. In the latter case, a separate pump is placed on the top of the check valve installed in the cover body, and when the pump is operated, the check valve is opened and the vacuum is made.

Looking at the known conventional vacuum cover, the Republic of Korea Utility Model Registration No. 0355863 (2001.08.39) 『Vacuum cover』, which is related to the vacuum cover of the form having a packing on the outer peripheral portion of the bottom portion and a check valve at the top Utility model registration No. 0371282 (2002.03.37) related to the vacuum cover which can be adjusted by height with folding helical frame and spring, `` Vacuum cover with adjustable height '', airtight holding member (packing member) A specific form of packing means related to the receiving surface is provided on the seating surface in contact with, or the protrusion is formed on the seating surface and the airtight holding member provided on the outer periphery of the bottom surface of the cover body is formed with the receiving portion recessed to accommodate the protrusion Utility Model Registration No. 0280872 (2002.06.24) has a vacuum cover.

However, all the registered utility models do not consider the inconvenience and injuries because the user cannot open the check valve with the nail in order to introduce air into the vacuum cover to remove food by removing the vacuum cover. Can not do it.

In addition, the utility models do not propose a solution to the problem of unchecked opening of the check valve during the food storage in the vacuum cover.

In addition, the packing member of the utility model was not reliable when the inside of the cover to maintain a vacuum for a long time. Although the Utility Model Registration No. 0280872 proposes a packing member having a specific structure, the present packing member requires a separate receiving container having a protrusion to function, which is actually closer to a vacuum container than a vacuum cover, This is different from the concept of a vacuum cover that places food on a smooth glass surface or a tray and covers it with a cover to store the food in a vacuum state, so that the airtightness of the registration utility model is less restricted to various types of seating parts that contact the cover. There seems to be a problem in securing the same as other conventional covers.

The present invention has been proposed to solve the problem of the opening operation and airtightness of the check valve, the airtightness of the packing means and the problems raised in the conventional vacuum covers described above.

Accordingly, an object of the present invention is to introduce a protective cap to the vacuum cover that can solve the problem that the check valve is opened at an undesired moment.

Another object of the present invention is to provide a coupling structure of a check valve, a lever and a protective cap that can easily open the check valve.

In addition, another object of the present invention is to introduce a packing member having a specific structure into the vacuum cover, which can further ensure airtightness when the inside of the vacuum cover is evacuated.

In addition, an object of the present invention is to provide a sliding means and a position fixing means that can ensure the operation reliability of the opening and closing for the check valve.

Vacuum cover according to the present invention to achieve the above object is a main body; A packing member provided at the bottom of the main body; A check valve installed in the main body; A lever coupled to an upper portion of the check valve; A protective cap positioned on the main body to cover the check valve; And provided in the protective cap, it comprises an opening and closing opening for opening the check valve by pressing the lever.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote members having the same function.

First, referring to FIGS. 1 and 2, the vacuum cover according to the present invention includes a main body 10 covering the food F, a packing member 20 provided on a bottom surface of the main body 10, in particular, an edge thereof. A check valve 30 positioned in the main body 10, a lever 40 coupled to the check valve 30, a protective cap 50 covering the check valve, and a protective cap 50 to slide. Combination is made to include an opening and closing hole 60 for pressing the lever 40 to open the check valve (30). The material of the main body 10 may be a variety of metals, synthetic resins, ceramics, and the like. Reference numeral 17 in Figure 2 refers to the pump seat.

The packing member in contact with the seating portion 19, such as glass, tray or a separate receiving plate in Figure 1 may be used in various forms, in the present invention that the groove is formed in the center to ensure more secure airtightness I thought about it. Due to the central groove it can be obtained the effect of double blocking the inside and outside of the vacuum device.

More preferably, as shown in detail in the partially enlarged circle of FIG. 1, the central groove of the packing member 20 is formed of one end 25a and two ends 25b so that the packing member 20 is more flexible. It can be made to contact with the seating part 19 reliably.

In order to enhance the flexibility of the packing member 20 so that the seating portion 19 and the packing member 20 can be more tightly contacted, and to separate the inside and the outside of the main body 10 from the packing member 20 more reliably, the packing The member 20 preferably has a thickness D1 of the outer contact portion 23a located outside the center grooves 25a and 25b thicker than the thickness D2 of the inner contact portion 23b.

The center groove may be a multi-stage form of more than two stages, but it is preferable that it is a two-stage form for ease of manufacture.

In FIG. 1, reference numeral 15 denotes a coupling part formed in the main body 10 for the packing member 20, and reference numeral 21 denotes a coupling of the packing member 20 fitted into the coupling part 15 of the main body 10. Represents wealth. The coupling part 21 of the packing member 20 is wedge-shaped so as to be easily inserted into the coupling part 15 of the main body 10. The coupling portion 15, 21 will help to ensure more tight air tightness if bonded by an adhesive.

6 shows a bottom view of another type of packing member 220. In FIG. 6, the first stage groove 225a is one groove continuously formed throughout the packing member 220, similarly to the one 25a of FIG. 1, but the second stage groove 225b is uniformly deeper than the first stage groove 225a. A plurality of grooves are formed in sparse intermittent spaces. In this case, in contrast to the packing member formed by connecting the two-stage grooves as a whole, the force for holding the inner and outer contact portions is insufficient, and the two-stage grooves 225b of the central groove shown in FIG. (223b) (223a) is prevented from excessively opening to help ensure proper flexibility with respect to securing flexibility, which is the purpose of introducing a two-stage groove.

In addition, the shape of each of the two-stage grooves may be longer than the length (D3) of the outer arc (224a) is longer than the length (D4) of the inner arc (224b) may help to obtain appropriate flexibility.

In FIG. 6, the thickness difference between the inner and outer contact portions 223b and 223a is the same as those of 23b and 23a of FIG. 2B.

1 and 6, the thickness of the packing members 20 and 220, in particular, the thickness of the contact portions 23a and 23b and 223a and 223b is exaggerated.

Next, the structure and coupling relationship of the main body 10, the check valve 30, the lever 40, the protective cap 50, and the opening / closing opening 60 will be described with reference to FIGS. 2, 3A and 3B.

Protective cap 50 of the present invention is located in the cap installation portion 13 of the main body 10, the protective cap 50 is easy to mold design and easy assembly of the protective cap 50 and the opening and closing port 60. In order to be made of an outer cap 51 and the inner cap 53.

The outer cap 51 and the inner cap 53 are provided with a position fixing means for easy to match the rectangular cutouts (51a) (53a) for the exposure of the opening and closing hole 60, the grip portion 67 during assembly have. The position fixing means shown is a projection 51b formed on the inner bottom surface of the outer cap 51 and a groove 53b formed in the inner cap 53 so that the projection 51b is fitted. However, the position fixing means may be implemented in such a way that the outer cap and the inner cap are inclined or bent correspondingly to each other instead of the protrusion 51b and the groove 53b to be engaged and coupled.

In addition, the outer cap 51 is symmetrically formed with two tungsten pieces 52, a minute projection (not shown) is formed on the inner edge of the bottom surface of the tungsten piece 52, the inner cap 53 and When combined, the inner and outer caps are not easily separated.

In addition, a protrusion 52a is formed at an outer side of the tungsten piece 52, and a cap corresponding to the protrusion 52a is formed in the cap installation part 13 (see FIG. 2) of the main body 10 (not shown). It is formed so as to limit the engagement position of the outer cap 51 and the main body 10. As a result, the assembling operation can be easily performed, and the separation preventing means of the lever 40 coupled to the check valve 30 can be easily coupled to each other at a fixed position as described below.

3A and 3B, the structure of the inner cap 53 will be described. The inner cap 53 is a slide in which the sliding protrusion 65 of the opening and closing hole 60 is coupled to both bottom surfaces of the cutout 53a. The groove 55 is formed. Optionally, the slide groove is formed in the opening and closing and the sliding protrusion may be formed in the inner cap.

In addition, a stopper is provided at a predetermined position around the cutout portion 53a of the inner cap 53 and the contact surface of the opening and closing hole 60 so that the opening and closing hole 60 that slides opens or closes the check valve 30. Being fixed in the position will help the operation of the stable opening and closing.

The stop means shown is a stop groove (59a) (see Fig. 3a) formed in the inner cap 53, and corresponding to the stop projection (63a) formed on the lower side of the right sliding projection (65) of the opening and closing (60) 3b). The stopper 63a of the opening and closing hole 60 receives elasticity from the finger piece 63. And because the stop groove (57a) of the inner cap is formed by the projection (57b), not the recessed shape, when the opening and closing hole 60 is slide the stop piece (63) does not exert the elasticity of the stop of the burnt piece Elasticity is exerted as the finger piece 63 is pushed inward by the force pushing the gripping portion 67 of the opening and closing hole 60 at the moment when the protrusion 63a and the protrusion 57b of the inner cap 53 come into contact with each other. . Therefore, the fingertip 63 can exert a long function because the tissue is not easily fatigued. The stop protrusion 63a is pressed by the stop piece 57a of the inner cap 53 while making a click sound due to the finger piece 63.

Although the illustrated stop groove 57a is formed in only one position, two positions of the inner cap 53, that is, the opening and closing hole 60 pressurizes the lever 40 to open the check valve 30 as necessary. Position and the position where the lever 40 is not pressurized so that the check valve does not open at an undesired moment.

On the other hand, the inner cap 53 is formed with a separation preventing means for actuating the lever 40 in a fixed position. That is, in FIG. 3B, recessed grooves 43a and 43b are formed at both sides of the lever 40, and the bottom surface of the inner cap 53 is fitted at a position corresponding to the recessed grooves 43a and 43b of the lever. The projections 57a and 57b are formed. Therefore, the check valve 30 is lifted in the process of evacuating the main body as shown in FIG. 4A or injecting air into the cover to open the main body 10 as shown in FIG. 4B, and the lever 40 is moved even if the lever 40 is moved. Is kept in place due to the separation preventing means (43a, 43b) (57a, 57b).

As described above, since the outer cap is assembled in position with the main body 10 due to the protrusions 52a formed on the carbon piece 52 of the outer cap 51 during the assembly of the vacuum cover, the protective cap 50 The fitting protrusions 57a and 57b of the fitting groove and the inlet grooves 43a and 43b of the lever 40 in the assembly position of the outer cap 51 when the lever 40 and the check valve 30 are combined. This can be done easily by staying in the corresponding constant direction.

In FIG. 3A, the check valve 30 used in the present invention is made of a soft synthetic resin such as silicon. As shown in detail in the enlarged circle of FIG. 4B, the upper disk 31 and the lower disk 33 which are formed at both ends of the connecting portion 35 positioned in the valve mounting portion 11 of the main body 10 are Formed.

In addition to obtaining the elasticity necessary for the valve function from the material as shown in the illustrated form, the check valve can also be used a known check valve which obtains the elasticity from the spring.

In the enlarged circle of FIG. 4B, the diameter of the connection part 35 of the valve 30 is smaller than the diameter of the insertion pipe 11a of the installation part 11 so that a portion corresponding to the difference in diameter forms an air inflow and outflow passage. The upper disk 31 has a larger diameter than the lower disk 33 to open and close the air inlet and outlet passages.

Meanwhile, in FIG. 3A, a means for coupling the lever 40 is formed at an upper portion of the check valve 30, which prevents the fitting portion 39 and the separation from the fitting groove 41 of the lever 40. It consists of plates 37.

Referring to Figures 3a, 3b and 2 will be described the assembling process of the check valve 30, the lever 40, the protective cap 50 and the opening and closing port 60 having the structure as described above as follows.

First, in FIGS. 3A and 3B, the sliding protrusion 65 of the opening and closing hole 60 is coupled to the sliding groove 55 of the inner cap 53. Subsequently, the inner cap 53 and the outer cap 51 are coupled to each other so that the groove 53b and the protrusion 51b which are position fixing means coincide. At this time, the inner cap 53 is not easily separated by the lower protrusion (not shown) of the finger piece 52 of the outer cap 51.

Next, in FIG. 2, the check valve 30 is inserted into the check valve mounting portion 11 of the main body 10, and the fitting groove 41 of the lever 40 is inserted into the fitting portion 39 of the check valve. Combine.

Subsequently, the groove 40 (not shown) formed on the inner circumferential surface of the tungsten piece 52 of the outer cap 51 and the insertion part 13 of the main body 10 is clamped with the lever 40 in the correct position. To combine. At this time, the fitting projections 57a and 57b of the inner cap 53, which are the separation preventing means, are coupled to the recessed grooves 43a and 43b of the lever 40.

When the assembly is completed, it is possible to attach the protective cap 50 and the cap installation portion 13 of the main body 10 using an adhesive.

5A and 5B show another type of vacuum cover. If the vacuum cover shown in Figures 1 to 3b is to cover the mounting portion 19 in the form of a flat plate to vacuum the inside of the cover, shown in Figures 5a and 5b is a mounting portion 119 of the same type as a general bowl The cover is put on.

Therefore, the cover body 110 of FIG. 5A is flat. In addition, the packing member 120 provided on the bottom surface 115 of the cover body 110 is a disk-shaped groove to form a plurality of concentric circles so that one cover can be used for the seating portion 119 having various edge diameters ( A plurality of 125 are formed on the disc. The groove 125 has to be inserted into the rim of the seating portion 119 to ensure the airtightness after the vacuum process and vacuum. The minute difference between the diameter of each groove 125 and the diameter of the seating portion 119 may be covered by the material properties of the packing member 120 having a degree of elasticity.

In addition, the check valve 130, the lever, the protective cap 150, the opening and closing of the vacuum cover, the pump seat 117 is the same as that shown in FIG.

7A and 7B show an alternative form of the protective cap and check valve opening and closing of the vacuum cover described above.

The illustrated protective cap 351 is similar to the overall outer shape of the outer cap 51 shown in Figure 3a, and also provided with a finger piece (reference numeral 52 in Figure 3a) for coupling with the cover body 310 It is.

7A includes a main body 361 having an outer circumferential surface in contact with an inner circumferential surface of the protective cap 351, and a central through hole 351a of the protective cap 351. It is composed of a pressing portion 363 inserted into the), and the elastic means 365 accommodated in the inner circumferential surface of the opening and closing hole 360, the main body 361.

The structure of the check valve 330 and the lever 340 has the same shape as that shown in Fig. 3a (30, 40).

In FIG. 7B, the protective cap 351 and the main body 361 of the opening and closing hole 360 are mounted to the installation portion of the protective cover main body 310. When the inside of the cover body 310 is evacuated or the air is introduced into the body 310, the air is a gap between the protective cap 351 through hole 351a and the pressing part 363 of the opening and closing hole 360. And a gap 354 between the protective cap 351 and the opening / closing body 361 and a passage connecting the through-hole of the check valve 330 installation unit. If necessary, an appropriate air communication path may be formed in the opening and closing hole 360 to allow smooth air inflow and outflow.

In FIG. 7B, when the check valve 330 is opened, the pressurizing portion 363 of the opening and closing hole 360 is pressed to compress the elastic means 365, and the lower surface of the pressing portion 363 presses the lever 340. Accordingly, the upper disk of the check valve 330 is lifted up and air is introduced into the cover body 310.

The opening of the check valve at an undesired moment in the opening and closing of this type can be achieved to some extent by the protective cap 351, but was not intended, but the lever 340 is pressed by the pressurizing portion 363, the check valve 330 Several measures can be taken to prevent the opening of). The simplest form is such that the height of the upper portion of the pressing portion 363 in the state in which the opening and closing hole 360 is not pressed is equal to or slightly lower than the upper height of the protective cap 351. Another method is to use the elastic means 365 having a strong elastic force to some extent.

Such openings and closing caps may be applied to the flat vacuum cupper 110 shown in FIG. 5A.

The operation and effects of the vacuum cover of the present invention described above will be described with reference to FIGS. 4A and 4B.

First, FIG. 4A is a cross-sectional view related to evacuating the inside of the cover body by using the pump P1, and slides the grip portion of the opening and closing hole 60 to the right to open the press portion 61 in contact with the lever 40. The opening and closing port stays in the state, and the inlet of the pump P1 is brought into close contact with the seating portion 17 of the main body 10. At this time, the position of the opening and closing hole 60 may be fixed by the fixing means.

The illustrated pump P1 is shaped like a syringe, and when the inlet of the pump P1 is brought into contact with the seat 17 of the main body 10 for the purpose of evacuation, the piston P2 should be positioned below. Various types of pumps may be used, and the pump may be a pump integrated with the cover body 10.

When the piston P2 is pulled, suction force acts through the cutout portions 51a and 53a of the outer cap 51 and the inner cap 53 which are not blocked by the opening and closing hole 60 by the suction force, and thus the check valve As the upper disk 31 of 30 is lifted, the air inside the cover body 10 is discharged from the check valve mounting portion 11 of the main body 10 located around the lower disk 33. ) And the insertion pipe 11a (FIG. 4B) in which the connection part 35 of the valve 30 is located, are sucked into the pump P1, and the cover is vacuumed to some extent. In the case of a pump equipped with a check valve, it is possible to increase the degree of vacuuming through repeated air discharge operation, and when using a pump operated by a power means such as a compressor, the degree of vacuum can be increased.

On the other hand, the protective cap 50 and the opening and closing device 60 according to the present invention can also be used in the vacuum cover to vacuum by using the body itself of the cover without using a mechanism. In this case, as shown in Figure 4b, by pushing the opening and closing hole 60 to the left side, the lever 40 is bent by the pressure portion 61 to open the check valve 30, and then press the elastic body to cover the cover body After allowing the air inside to escape, vacuuming is performed in such a way that the check valve is closed by pushing the opening / closing opening to the right again.

Subsequently, when the vacuum by the pump P1 is completed and the pump P1 is separated from the main body 10, the upper disk 31 of the check valve 30 is disposed between the insertion pipe 11a of the main body and the connection portion 35 of the valve. Close the formed air inlet passage.

When opening the cover in such a state, as shown in Figure 4b, by pushing the opening and closing hole 60 to the left side so that the pressurizing portion 61 presses the lever 40 so that the upper disk 31 of the check valve 30 is lifted. Allow air to enter the cover.

In addition to preventing the protective cap from covering the check valve to prevent the check valve 30 from opening at an undesired moment in the form of the protective cap 50 and the opening and closing hole 60 shown in FIG. 4B, the opening and closing hole 60 is Means may be introduced to prevent the check valve from opening by sliding the lever 40 at an unintended moment. For example, the upper height of the grip portion 67 of the opening and closing hole 60 may be equal to the upper height of the outer cap 51, or the protruding degree of the stop means 59a, 59b, 63, 63a described above. And elasticity may be increased.

As described above, the vacuum cover having a protective cap for the check valve according to the present invention can solve the problem that the check valve is opened at an undesired moment through the installation form of the protective cap and the opening and closing, and through the opening and closing check The valve can be opened easily.

In addition, the present invention is easy to mold design because the protective cap is separated into the inner cap and the outer cap, the assembly structure of the outer cap of the inner cap and the various position fixing means is easy to assemble the opening and closing the protective cap, It is possible to ensure the operation reliability through the sliding means for the stop means and the release prevention means for the lever.

+

In addition, through the packing member having a central groove, in particular, the central groove of the two stages can ensure a firm airtightness during the vacuumization process.

In the above description of the present invention, a vacuum cover having a specific shape and structure has been described with reference to the accompanying drawings. However, the present invention can be variously modified and changed by those skilled in the art. Should be interpreted as belonging.

1 is a cross-sectional view showing a state of use of the vacuum cover according to the present invention,

2 is a lateral cutaway perspective view of a vacuum cover according to the present invention;

3A and 3B are views illustrating a coupling relationship between a protective cap, a check valve, a lever, and an opening / closing block forming the core of the present invention.

4A is a cross-sectional view associated with the operation of evacuating the cover using a pump;

Figure 4b is a cross-sectional view showing the operating state of the opening and closing when opening the cover,

5A and 5B are cross-sectional cutaway and exploded perspective views showing another type of vacuum cover.

6 is a bottom view showing another form of the packing member.

Figures 7a and 7b is an exploded perspective view showing an alternative form for the protective cap and the opening shown in Figure 3a and the combined sectional view with the cover body.

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

10,110,310: Main unit 11: Check valve mounting part

11: Pump seating groove 11a: Check valve insertion pipe

11b: outlet hole 13: cap mounting portion

15: packing member coupling 17: pump seat

20,120,220: packing member 21: coupling part

23a, 23b: contact portion 25a, 25b: center groove

30,130,330: check valve 31: upper disc

33: lower disk 35: connecting portion

37: release prevention plate 39: fitting

40,340: Lever 41: Fitting groove

43a, 43b: Concave groove 50,150,351: Protective cap

51: outer cap 53: inner cap

51a, 53a: Incision 55: Slide groove

60, 360: opening and closing 61: pressurization portion

63: Tangier 63a: Tangier Project

65: gliding 67: gripper

Claims (13)

main body; A packing member provided at the bottom of the main body; A check valve installed in the main body; A lever coupled to an upper portion of the check valve; A protective cap positioned on the main body to cover the check valve; And The cover is provided in the protective cap, comprising a opening and closing opening for opening the check valve by pressing the lever. The method of claim 1, The protective cap is formed with a rectangular incision, The opening and closing the vacuum cover, characterized in that the pressing portion provided on the bottom portion to press the lever while moving along the sliding means disposed on the cut portion of the protective cap. The method of claim 2, wherein the protective cap An outer cap having a rectangular incision; And And a cutout corresponding to the cutout of the outer cap, the outer cover being in close contact with the inner circumferential surface of the outer cap, and a vacuum cover comprising an inner cap having sliding means formed thereon. The method of claim 2 or 3, wherein the sliding means And a sliding groove formed along a rectangular cutout of the protective cap, and a sliding protrusion formed on both sides of the opening and closing hole so as to be inserted into the sliding groove. The method of claim 1, The opening and closing port is supported by the elastic means and arranged on the lever, The protective cap is a vacuum cover, characterized in that the through-hole is formed to be coupled to the pressing portion of the opening and closing. The method of claim 1, wherein the packing member is A vacuum cover, characterized in that the central groove is formed in contact with the surface of the seating portion. The method of claim 6, wherein the central groove of the packing member A vacuum cover, characterized in that the two stages. The method of claim 7, wherein the central groove of the packing member A vacuum cover, characterized in that the first stage grooves are one groove continuously formed over the whole of the packing member, and the second stage grooves are a plurality of grooves which are formed intermittently at regular intervals. The method of claim 8, wherein each of the two-stage groove of the center groove A vacuum cover, characterized in that the length of the arc located on the outside is longer than the length of the arc located on the inside. The method of claim 6, wherein the packing member And a thickness of the outer contact portion located outside the central groove is thicker than the inner contact portion. The method of claim 1, wherein the check valve is The cover is made of a soft synthetic resin, characterized in that it comprises an upper disk and a lower disk formed on both ends of the connecting portion located in the valve installation portion insertion tube of the main body. The method according to any one of claims 1, 2, 3, 5, Between the lever and the protective cap is a vacuum cover, characterized in that the separation prevention means for the lever is provided. The method according to any one of claims 1, 2, 3 and 5 The packing member is in the form of a disk attached to the bottom surface of the main body, a vacuum cover, characterized in that a plurality of grooves are formed in the disk to form a plurality of concentric circles.