JP6902445B2 - Sealing device - Google Patents

Description

The present invention relates to a sealing device attached to the mouth of a container, and more particularly to a sealing device having an external screw and an internal screw.

As a known sealing device used for the mouth of a container, a main body and an upper lid are provided, and in the main body, a tubular portion to be fitted to the mouth of the bottle and a tubular portion inside the main body via a score are continuously provided. Some are provided with a separating portion or an inner plug (see Patent Document 1).

In this sealing device, an external screw is provided between the upper lid and the tubular portion, and an internal screw is provided between the upper lid and the separating portion. For example, both the external screw and the internal screw have a forward relationship and are external. By providing a difference between the pitch of the screws and the pitch of the internal screws, the separating portion can be separated from the tubular portion by rotating the upper lid at the time of opening.

However, when the separating portion is separated by providing a difference in pitch between the outer screw and the inner screw as in the sealing device, there is a high possibility that the inner screw loosens and the separating portion or the inner plug falls off at the time of opening.

International Publication No. 2007/126062

The present invention has been made in view of the above background art, and an object of the present invention is to provide a sealing device in which loosening of an internal screw is reduced to prevent the separation portion or the inner plug from falling off.

In order to solve the above problems, the sealing device according to the present invention includes a main body and a cap, and the cap can be attached and detached by a positive screw type first fastening portion provided between the main body and the cap. At the same time, it is a sealing device that separates the inner plug from the main body and captures it on the cap by the positive screw type second fastening part provided between the main body and the cap inside the first fastening part. The external screw constituting the first fastening portion has a larger number of threads than the internal screw constituting the second fastening portion, and the lead of the external screw is larger than the lead of the internal screw.

According to the sealing device, the external screw constituting the first fastening portion has a larger number of threads than the internal screw constituting the second fastening portion, and the lead of the external screw is larger than the lead of the internal screw. When opening the package, the looseness or play of the outer screw can be made much smaller than the looseness or play of the inner screw, and the inner plug can be pulled up greatly as the cap rises. As a result, the screwing back of the inner plug can be reduced, and the inner plug can be prevented from falling off.

In a specific aspect or side surface of the present invention, in the sealing device, when the cap is attached to the main body before opening and the cap is rotated in the loosening direction, the cap is separated from the outer peripheral portion of the main body. The timing at which the inner plug starts moving in the direction is earlier than the timing at which the inner plug starts moving upward away from the outer peripheral portion of the main body. In this case, the action of pulling up the inner plug becomes faster as the cap rises, and it is possible to suppress the loosening of the inner plug while accelerating the separation of the inner plug.

In another aspect of the present invention, at least one of the cap inner screw and the inner plug inner screw constituting the second fastening portion is more than an overpass in which the inner plug is pushed into the support portion on the cap side and the inner plug is pulled out from the support portion. Has a biased thread shape that also facilitates. In this case, in the step of assembling the main body to the cap, the first fastening portion can be tightened to a predetermined position, and the second fastening portion can be forced to get over the screw thread.

In yet another aspect of the invention, the biased thread shape has a cross section biased in the anti-screw direction corresponding to the pulling direction.

In yet another aspect of the present invention, the second fastening portion is screwed all the way in a state where the main body and the cap are combined. In this case, even if the first fastening portion is unscrewed so as to be loosened, the second fastening portion is less screwed back, and the inner plug can be prevented from falling off.

In yet another aspect of the present invention, of the cap inner screws and inner plug inner screws constituting the second fastening portion, the cap inner screw is formed on the outer surface of the cap cylindrical portion extending downward from the top plate of the cap, and is formed inside. The inner plug screw is formed on the inner surface of the inner plug cylindrical portion extending upward from the outer edge of the inner plug seal.

It is sectional drawing for demonstrating the sealing apparatus of 1st Embodiment which concerns on this invention. (A) is an enlarged cross-sectional view explaining the screw thread of the first fastening part, and (B) is an enlarged cross-sectional view explaining the screw thread of the second fastening part. It is sectional drawing explaining the assembly method and the usage method of the sealing apparatus shown in FIG. (A) and (B) are cross-sectional views explaining the assembly method and the usage method of the sealing apparatus shown in FIG. (A) and (B) are cross-sectional views explaining the assembly method and the usage method of the sealing apparatus shown in FIG.

A sealing device according to an embodiment of the present invention will be described with reference to FIG. The illustrated sealing device 100 is composed of a main body 10 attached to an opening 2a of a container 2 such as a paper carton or a pouch container, and a cap 20 attached to the main body 10 so as to cover the main body 10. ..

The main body 10 is an integrally molded product made of resin, and includes an outer peripheral portion 11 fixed along the peripheral edge portion 2b of the opening 2a of the container 2 and an inner plug 12 separated from the outer peripheral portion 11 at the time of opening. Hereinafter, opening means that the inner plug 12 is separated from the outer peripheral portion 11, and opening and closing of the cap 20 after opening is referred to as opening or closing.

The outer peripheral portion 11 of the main body 10 is a portion that forms a spout for the contents of the container 2 after the inner plug 12 is separated, and is the outer side or the upper side of the container 2 along the screw shaft AX that is the axis of the main body 10. It has a main body outer peripheral wall 31 which is a cylindrical member extending to. Further, the outer peripheral portion 11 has a thick main body pedestal 32 protruding outward in the radial direction at the lower end of the outer peripheral wall 31 of the main body and a thin welded portion 33 protruding outward in the radial direction from the peripheral surface of the main body pedestal 32. Have. The upper surface of the welded portion 33 is fixed to the lower surface of the peripheral edge portion 2b of the container 2 by ultrasonic fusion. On the peripheral surface of the main body pedestal 32, locking portions 34 are formed at 2 to 8 points in the circumferential direction at equal intervals so as to project outward in the radial direction. Further, on the outer peripheral wall 31 of the main body 10 of the main body 10, a main body external screw 51, which is a positive screw for screwing to the cap 20, is formed on the outer peripheral surface. The screw shaft AX means a shaft passing through the center of the main body 10 and the cap 20 or a rotation shaft of the cap 20.

The inner plug 12 of the main body 10 includes a disk-shaped sealing body 41 arranged at the bottom and a cylindrical inner plug cylindrical portion 42 extending upward from the outer edge of the sealing body 41. The outer peripheral side boundary portion 17 in which the outer edge of the sealing body 41 and the lower end portion of the inner plug cylindrical portion 42 are connected is connected to the outer peripheral portion 11 of the main body 10 by an annular thin-walled portion 15. An annular V-groove-shaped score 16 is formed on the lower surface of the thin portion 15. The thin portion 15 is cut when the inner plug 12 is separated from the main body 10 and opened. The inner plug cylindrical portion 42 is concentrically and spaced apart from the inside of the outer peripheral wall 31 of the main body. On the inner peripheral surface (inner side surface) of the inner plug cylindrical portion 42, an inner plug inner screw 52, which is a positive screw like the main body outer screw 51, is formed.

The cap 20 is an integrally molded product made of resin, and includes a disk-shaped cap top plate 21 and a cylindrical cap outer peripheral wall 22 as outer portions. A knurl is formed around the outer peripheral wall 22 of the cap. The cap 20 includes a cap cylindrical portion 23 which is an inner support portion arranged on the innermost side in the same core as the cap outer peripheral wall 22, and an outer support portion 24 arranged on the outer side of the cap cylindrical portion 23. Further, between the outer peripheral wall 22 of the cap and the outer support portion 24, an inner ring 25 which is similarly concentric and cylindrical but relatively short in the screw shaft AX direction is provided. The inner ring 25 seals the opening 2a of the container 2 after opening. The cap cylindrical portion 23, the outer support portion 24, and the inner ring 25 are connected to each other by the cap top plate 21. Then, on the inner peripheral side surface of the cap outer peripheral wall 22, a cap outer screw 53 screwed with the main body outer screw 51 formed on the outer peripheral side surface of the main body outer peripheral wall 31 of the main body 10 is formed, and the outer peripheral surface of the cap cylindrical portion 23 is formed. On the (outer surface), a cap inner screw 54 screwed into the inner stopper inner screw 52 formed on the inner peripheral side surface of the inner stopper cylindrical portion 42 of the inner stopper 12 provided on the main body 10 is formed.

In the above, the main body external screw 51 of the main body outer peripheral wall 31 of the main body 10 and the cap external screw 53 of the cap outer peripheral wall 22 of the cap 20 form a first fastening portion 50a that enables the cap 20 to be attached to and detached from the main body 10. doing. Further, the inner plug inner screw 52 of the inner plug cylindrical portion 42 of the main body 10 and the inner cap inner screw 54 of the cap cylindrical portion 23 of the cap 20 fix the inner plug 12 of the main body 10 to the cap cylindrical portion 23 of the cap 20. A second fastening portion 50b is formed for this purpose. That is, the cap cylindrical portion 23 of the cap 20 functions as a support portion capable of separating the inner plug 12 from the main body 10 or the outer peripheral portion 11 by capturing the inner plug 12 by the second fastening portion 50b. .. The first fastening portion 50a is a positive screw type screwed portion that is tightened by clockwise rotation and loosened by counterclockwise rotation, and the second fastening portion 50b is also tightened by clockwise rotation and loosened by counterclockwise rotation. It is a positive screw type screw part. That is, when the cap 20 is screwed back so that the first fastening portion 50a is loosened by rotating the cap outer peripheral wall 22 of the cap 20 in the counterclockwise direction and the cap 20 is raised, the cap cylindrical portion 23 of the cap 20 is moved upward. It is rotated counterclockwise when viewed from the above, and the second fastening portion 50b is screwed back so as to loosen, which has the effect of suppressing the rise of the inner plug cylindrical portion 42.

The first fastening portion 50a, that is, the main body external screw 51 formed on the main body outer peripheral wall 31 of the main body 10 and the cap outer screw 53 formed on the cap outer peripheral wall 22 of the cap 20 that meshes with the first fastening portion 50a are the main body outer circumference of the main body 10. It has a thread shape that balances the resistance to overcoming the wall 31 being pulled out from the cap outer peripheral wall 22 of the cap 20 and the resistance to getting over the main body outer peripheral wall 31 to be pushed into the cap outer peripheral wall 22.

On the other hand, the second fastening portion 50b, that is, the inner plug inner screw 52 formed on the inner plug 12 of the main body 10 and the inner cap screw 54 formed on the cap cylindrical portion 23 of the cap 20 that meshes with the second fastening portion 50b are the main body 10. It has a biased screw thread shape that makes it easier to get over the inner plug 12 by pushing it into the cap cylindrical portion 23 as a support portion than by pulling out the inner plug 12 from the cap cylindrical portion 23. Such a biased screw thread shape that facilitates pushing is also called a burr shape.

With reference to FIG. 2A, the thread shapes of the external screws 51 and 53 constituting the first fastening portion 50a will be described in more detail.

The main body external screw 51, which is a male screw constituting the first fastening portion 50a, has a cross section as shown in which the screw shaft AX passes, and the screwing direction or the screwing direction (upper side) of the outer peripheral portion 11 along the screw shaft AX. The thread has a cross-sectional shape that is well-balanced with respect to the screw-back direction or the counter-screw direction (lower side) of the outer peripheral portion 11. More specifically, the thickness (H1a) of the base of the external screw 51 of the main body is set to be wider than the thickness (H1b) of the top, and the thread upper surface 51t, which is the engaging surface on the screwing side, is on the anti-screw side. It is inclined (angle θ11 ≈ φ11) in the same manner as the threaded lower surface 51b, which is the engaging surface of the screw thread.

Similarly, the cap external screw 53, which is a female screw constituting the first fastening portion 50a, has a screwing direction or a screwing direction (lower) of the cap 20 along the screw shaft AX in a cross section as shown in the drawing through which the screw shaft AX passes. The threads have a well-balanced cross-sectional shape with respect to the side) and the screw-back direction or counter-screw direction (upper side) of the cap 20. More specifically, the cap outer screw 53 has a base thickness (H2a) set wider than the top thickness (H2b), and the thread lower surface 53b, which is an engaging surface on the screwing side, is on the anti-screw side. The screw thread upper surface 53t, which is the engaging surface of the above, is inclined (angle θ12≈φ12).

The external screws 51 and 53 constituting the first fastening portion 50a are multi-threaded screws, specifically two-threaded screws, and the lead L1 of the first fastening portion 50a is 2 at the pitch of the main body external screw 51. It has doubled. As shown in FIG. 1, the main body external screw 51 is composed of Article 1 51f and Article 2 51s, and these Articles 51f and 51s are arranged alternately. Similarly, the cap external screw 53 is composed of Article 1 53f and Article 2 53s, and these Articles 53f and 53s are arranged alternately.

With reference to FIG. 2B, the thread shapes of the internal screws 52 and 54 constituting the second fastening portion 50b will be described in more detail.

The inner plug internal screw 52, which is a female screw constituting the second fastening portion 50b, serves as a moving component along the screw shaft AX of the inner plug 12 toward the tip thereof in the cross section as shown in the drawing through which the screw shaft AX passes. The threads have a cross-sectional shape that is biased in the screw-back direction or the counter-screw direction (lower side). From a different point of view, the inner plug internal screw 52 is a second surface that comes into contact with the inner plug when it is pulled out, that is, a screw thread that is an engaging surface on the counter-threading side with the cap inner screw 54 when the inner plug 12 is displaced downward. The lower surface 52b is formed at an angle close to horizontal (angle θ21), and the thickness of the base portion (H3a) is set wider than the thickness of the top portion (H3b). That is, the inner plug internal screw 52 has a first surface or an engaging surface on the screwing side that comes into contact with the screw 52 when it is pushed over, and a second surface or an engaging surface on the anti-screw side that the upper surface 52t of the thread comes into contact with when it is pulled out. It is tilted more (angle θ21 <φ21) than the lower surface of the screw thread 52b.

Similarly, the cap internal screw 54, which is a male screw constituting the second fastening portion 50b, serves as a moving component along the screw shaft AX of the cap 20 toward the tip thereof in the cross section as shown in the drawing through which the screw shaft AX passes. The thread has a cross-sectional shape that is biased in the screw-back direction or the counter-screw direction (upper side) of the screw thread. From a different point of view, the cap inner screw 54 has a second surface that comes into contact with the cap 20 when it is pulled out, that is, a thread upper surface that is an engagement surface on the counter-screw side with the inner plug inner screw 52 when the cap 20 is displaced upward. 54t is formed at an angle close to horizontal (angle θ22), and the thickness of the base (H4a) is set wider than the thickness of the top (H4b). That is, the screw 54 in the cap is the first surface that comes into contact with the screw 54 when it is pushed over, or the engaging surface on the anti-screw side that comes into contact with the lower surface 54b of the screw thread that is the engaging surface on the screwing side when it is pulled out. It is tilted more (angle θ22 <φ22) than a certain thread upper surface 54t.

The internal screws 52 and 54 constituting the second fastening portion 50b are single-threaded screws, and the lead L2 of the second fastening portion 50b coincides with the pitch of the inner plug internal screw 52. The lead L2 of the second fastening portion 50b is about 1/2 that of the lead L1 of the first fastening portion 50a, and when the cap 20 is rotated counterclockwise when the cap 20 is opened, the inner plug 12 is the cap 20. Alternatively, the amount of descent with respect to the cap cylindrical portion 23 is about half the amount of the cap 20 with respect to the main body 10. As a result, the inner plug 12 can be pulled up relatively greatly as the cap 20 rises, and the inner plug 12 can be separated from the main body 10.

Further, in the state before opening in which the cap 20 is rotated counterclockwise, the vertical gap G1 between the thread upper surface 51t of the main body external screw 51 and the thread lower surface 53b of the cap external screw 53 (FIG. 2A). (See) is sufficiently smaller than the vertical gap G2 (see FIG. 2B) between the thread upper surface 52t of the inner plug inner screw 52 and the thread lower surface 54b of the cap inner screw 54. That is, the looseness or play of the first fastening portion 50a is smaller than the loosening or play of the second fastening portion 50b, and the first fastening portion 50a is loosened so as to be screwed back by the counterclockwise rotation of the cap 20. Even if it starts, the timing at which the second fastening portion 50b begins to loosen so as to be screwed back and the inner plug 12 descends relative to the cap cylindrical portion 23 is slightly delayed. As a result, it is possible to prevent the inner plug 12 from loosening with respect to the cap cylindrical portion 23, increase the certainty of holding the inner plug 12 by the cap cylindrical portion 23, and prevent the inner plug 12 from falling off. ..

Hereinafter, an example of an assembly method of the sealing device 100 will be described with reference to FIG. 3 and the like. First, the main body 10 and the cap 20 are prepared. Next, the main body external screw 51 of the main body 10 is engaged with the cap external screw 53 of the cap 20 so that the main body 10 is housed in the cap 20, and the main body 10 is rotated clockwise when viewed from the main body 10 side or the cap 20. Is rotated clockwise when viewed from the cap 20 side. As a result, the first fastening portion 50a is tightened so as to be screwed in, and the main body external screw 51 and the cap external screw 53 are screwed together. At that time, the inner plug internal screw 52 and the cap internal screw 54 constituting the second fastening portion 50b are screwed in by rotating clockwise, but the lead L1 of the first fastening portion 50a and the lead of the second fastening portion 50b are screwed. Due to the difference from L2, the screwing amount tends to decrease. However, since the internal screws 52 and 54 are formed in a biased thread shape or a burr shape that are easily deformed when pushed in as described above, they overcome each other by overcoming the threads of the internal screws 52 and 54 while deforming each other. Be meshed. At this time, the tip portion 24d of the outer support portion 24 abuts or approaches the outer upper surface of the thin-walled portion 15 (see FIG. 4 (A)).

In this way, when the main body 10 and the cap 20 are screwed all the way in and engaged with each other, the distance between the main body 10 and the cap 20 is adjusted and formed at the base of the outer support portion 24 and the cap cylindrical portion 23. The tip portion 42d of the inner plug cylindrical portion 42 is housed in the recess E to be formed. Further, the lip portion 31b formed at the tip of the outer peripheral wall 31 of the main body is positioned in a state of being in contact with the lower surface 21t of the cap top plate 21 of the cap 20.

The sealing device 100 (main body 10 and cap 20) assembled as described above is inserted into the opening 2a of the container 2 such as a paper carton from the back side, and the main body of the main body 10 is inserted into the inner peripheral surface of the opening 2a. The outer peripheral surface of the pedestal 32 is fitted and joined to the container 2 by ultrasonic bonding, adhesive bonding, or the like (see FIG. 4 (A)).

Hereinafter, the opening operation of the sealing device 100 of the above embodiment will be described with reference to FIG. 4A and the like.

Initially, as shown in FIG. 4A, the cap 20 is in the reference position or the initial position (screwed to the back) of the fastening portions 50a and 50b before the rotation operation, and the inner plug 12 and the outer peripheral wall 31 of the main body Is in a bonded state, and the opening 2a (FIG. 4 (A)) of the container 2 or the opening 11a (FIG. 5 (A)) of the main body 10 is sealed.

When the cap 20 is rotated in the direction of loosening the cap 20 from the state of FIG. 4A, that is, counterclockwise, the cap external screw 53 comes into contact with the main body external screw 51, and the cap 20 begins to rise due to the action of the first fastening portion 50a. .. Following this, as the cap 20 rotates, the cap inner screw 54 comes into contact with the inner plug inner screw 52 and the second fastening portion 50b begins to act, and the inner plug 12 acts on the cap 20 or the cap cylindrical portion 23. It begins to descend relatively. However, the lead of the first fastening portion 50a is larger than that of the second fastening portion 50b, the cap 20 rises more, and the inner plug 12 also forcibly rises with respect to the main body 10 (FIG. 4B). When the amount of rise of the cap 20 becomes larger than a certain level, the thin portion 15 of the main body 10 is stretched and broken, the inner plug 12 is separated from the outer peripheral wall 31 of the main body to form an opening 11a, and the sealing device 100 is opened. (See FIG. 5 (A)). In this state, the inner plug 12 is slightly screwed back to the cap cylindrical portion 23, but is screwed back to the cap cylindrical portion 23 and held by the cap 20.

Further, when the cap 20 is rotated in the loosening direction, the cap 20 is separated from the outer peripheral wall 31 of the main body, whereby the contents in the container 2 can be poured. At that time, the inner plug 12 is secured by the cap 20 and there is no possibility of detachment. That is, once the package is opened, the inner plug 12 fixed to the main body 10 side is fixed to the cap 20 side.

Explaining after opening, when the cap external screw 53 of the cap 20 is screwed into the main body external screw 51 of the main body 10 and the cap 20 is rotated clockwise, the lip portion 31b formed at the upper end of the outer peripheral wall 31 of the main body 31b. Is in contact with the lower surface 21t of the cap top plate 21 of the cap 20, and the tip portion 24d of the outer support portion 24 is in close contact with or close to the outer surface of the thin-walled portion 15.

In the sealing device 100 of the present embodiment, the external screws 51 and 53 constituting the first fastening portion 50a have more threads than the internal screws 52 and 54 constituting the second fastening portion 50b, and the external screws 51, Since the lead L1 of 53 is larger than the lead L2 of the internal screws 52 and 54, when opening the package, the looseness or play of the external screws 51 and 53 is made considerably smaller than the looseness or play of the internal screws, and the cap 20 is raised. Along with this, the inner plug 12 can be pulled up greatly. As a result, the screwing back of the inner plug 12 can be reduced, and the inner plug 12 can be prevented from falling off.

Although the sealing device according to the present embodiment has been described above, the sealing device according to the present invention is not limited to the above. For example, in the above embodiment, specifications such as the pitch, the number of turns, and the thread height of the main body external screw 51 and the cap external screw 53 constituting the first fastening portion 50a can be appropriately used as long as the effects of the invention can be achieved. It can be changed accordingly. Further, the specifications such as the pitch, the number of turns, and the thread height of the cap inner screw 54 and the inner plug inner screw 52 constituting the second fastening portion 50b can be changed in the same manner.

In the above embodiment, the first fastening portion 50a is composed of one thread and the second fastening portion 50b is composed of two threads, but the number of threads of the second fastening portion 50b is the number of threads of the first fastening portion 50a. The number may be larger than the number. For example, the first fastening portion 50a may have two or more threads and the second fastening portion 50b may have three or more threads.

Further, in the above embodiment, the outer support portion 24 of the cap 20 may be omitted.

Further, in the above embodiment, the inside and outside of the inner plug cylindrical portion 42 of the main body 10 and the cap cylindrical portion 23 of the cap 20 can be exchanged. Also in this case, the male screw of the inner plug cylindrical portion 42 and the female screw of the cap cylindrical portion 23 form a positive screw type second fastening portion 50b as in the first fastening portion 50a.

In the above embodiment, the shapes of the main body external screw 51 and the cap external screw 53 constituting the first fastening portion 50a are not limited to those illustrated in FIG. 1 and the like, and may have various cross-sectional shapes. Further, the external screws 51 and 53 constituting the first fastening portion 50a are not limited to those formed continuously in a spiral shape, and may be composed of a plurality of separated portions.

In the above embodiment, the shapes of the inner plug inner screw 52 and the cap inner screw 54 constituting the second fastening portion 50b have a biased thread shape or a burr shape that facilitates pushing, as illustrated in FIG. It is not limited to the threads that it has, and can have various cross-sectional shapes. Further, the internal screws 52 and 54 constituting the second fastening portion 50b are not limited to those formed continuously in a spiral shape, and may be composed of a plurality of separated portions. Further, one of the internal screws 52 and 54 may have a biased burr shape, and the other may have a shape in which the resistance related to insertion / removal is balanced.

In the above embodiment, the upper surface of the welded portion 33 of the main body 10 is fixed to the lower surface of the peripheral edge portion 2b of the container 2, but the lower surface of the welded portion 33 may be fixed to the upper surface of the peripheral edge portion 2b. .. In this case, the main body pedestal 32 of the main body 10 and the welded portion 33 may have the same thickness, and the locking portion 34 may be omitted.

2 ... container, 2a ... opening, 2b ... peripheral edge, 10 ... main body, 11 ... outer peripheral part, 11a ... opening, 12 ... inner plug, 15 ... thin wall part, 16 ... score, 17 ... outer peripheral side boundary, 20 ... Cap, 21 ... Cap top plate, 22 ... Cap outer wall, 23 ... Cap cylindrical part, 24 ... Outer support part, 24r ... Burr storage part, 25 ... Inner ring, 31 ... Main body outer wall, 32 ... Main body pedestal, 33 ... Welding part, 34 ... Locking part, 41 ... Sealing body, 42 ... Inner plug cylindrical part, 50a ... First fastening part, 50b ... Second fastening part, 51 ... Main body external screw, 52 ... Inner plug internal screw, 52b ... Thread top surface, 52t ... Thread top surface, 53 ... Cap external screw, 54 ... Cap internal screw, 54b ... Thread bottom surface, 54t ... Thread top surface, 100 ... Sealing device, AX ... Screw shaft

Claims (6)

The main body and the cap are provided, and the cap can be attached and detached by the positive screw type first fastening portion provided between the main body and the cap, and the main body is inside the first fastening portion. A sealing device that separates the inner plug from the main body and captures it on the cap by a positive screw type second fastening portion provided between the cap and the cap.
A sealing device in which the external screws constituting the first fastening portion have a larger number of threads than the internal screws constituting the second fastening portion, and the leads of the external screws are larger than the leads of the internal screws. When the cap is assembled to the main body before opening and the cap is rotated in the loosening direction, the timing at which the cap starts moving upward away from the outer peripheral portion of the main body is the inner plug. The sealing device according to claim 1, wherein is set to be earlier than the timing at which the head starts moving upward away from the outer peripheral portion of the main body. At least one of the cap inner screw and the inner plug inner screw constituting the second fastening portion is easier to get over by pushing the inner plug into the support portion on the cap side than by pulling out the inner plug from the support portion. The sealing device according to any one of claims 1 and 2, which has a biased thread shape. The sealing device according to claim 3, wherein the biased screw thread shape has a cross section biased in the counter-threading direction corresponding to the pulling direction. The sealing device according to any one of claims 1 to 4, wherein the second fastening portion is screwed to the deepest position in a state where the main body and the cap are combined. Of the cap inner screw and the inner plug inner screw constituting the second fastening portion, the cap inner screw is formed on the outer surface of the cap cylindrical portion extending downward from the top plate of the cap, and the inner plug inner screw is formed. The sealing device according to any one of claims 1 to 5, which is formed on the inner surface of the inner plug cylindrical portion extending upward from the outer edge of the sealing body of the inner plug.

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