JP6875894B2 - 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, the separating part of the main body is attached to the upper lid in advance with a reverse screw, and in order to facilitate the attachment of the separating part and make it difficult to remove, the cross section of the screw thread is made into a burr shape or a barb shape. There is. As a result, when the bottle is opened, the upper lid attached to the mouth of the bottle is screwed back so as to remove the upper lid, which causes a movement difference between the separating portion of the main body and the upper lid, or the separating portion is moved to the outer peripheral side of the main body. On the other hand, it can be forcibly rotated to separate the separation part from the tubular part of the main body and hold the separation part on the upper lid. According to this cap structure, the opening can be easily performed by simply rotating the upper lid so as to loosen it, and the separating portion separated by opening is held in the upper end inner cylinder of the upper lid, so that the separated portion after separation is opened. It can be made to function as a seal later, and the separation part does not become so-called dust.

However, in the above sealing device, when the upper lid is resealed or closed after opening, there is a possibility that the fracture surfaces facing each other at the separation or cutting portion of the separation portion rub against each other and the burrs remaining on the fracture surface may peel off. Yes, loosening of the separation can occur.

International Publication No. 2014/115857

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 capable of preventing peeling of burrs remaining on a fracture surface at a separation portion or a cut portion of an inner plug.

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 at the time of opening by the reverse screw type second fastening part provided between the main body and the cap inside the first fastening part. When the cap is attached 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 part of the main body is the timing at which the inner plug starts to move upward. A first loosening that is set to be the same as or later than the timing to start moving upward away from, and is determined based on the clearance between the threads in the loosening direction of the first fastening and the lead of the first fastening. The release angle is set to be equal to or greater than the second loosening elimination angle determined based on the clearance between the threads in the tightening direction of the second fastening portion and the lead of the second fastening portion, and the first loosening elimination angle is set. , The amount is larger than the sum of the deviation generation angle corresponding to raising the inner plug by the thickness of the thin part provided on the outer edge of the inner plug of the main body due to the rotation of loosening the cap with respect to the second loosening elimination angle. ..

According to the sealing device, when the cap is loosened, the timing at which the cap starts moving upward away from the outer peripheral portion of the main body is the timing at which the inner plug starts moving upward away from the outer peripheral portion of the main body. Since it is set to be the same or slower, it is easier to move the inner plug relatively upward with respect to the cap after opening.
In the sealing device, the first loosening elimination angle determined based on the clearance between the threads in the loosening direction of the first fastening portion and the lead of the first fastening portion is the clearance between the threads in the tightening direction of the second fastening portion. The clearance is set to be equal to or larger than the second loosening elimination angle determined based on the clearance of the second fastening portion and the lead of the second fastening portion. Further, the first loosening elimination angle is a deviation generation corresponding to raising the inner plug by the thickness of the thin-walled portion provided on the outer edge of the inner plug of the main body due to the rotation of loosening the cap with respect to the second loosening elimination angle. Greater than the sum of the angles. As a result, the cap does not rise even if the inner plug is raised by the thickness of the thin-walled part. Therefore, when the cap is resealed, the misalignment between the cut portions can be secured at least about the thickness of the thin-walled part, and the inner plug can be used. It becomes difficult to touch the broken part with the broken part on the outer periphery of the main body.

From another viewpoint of the present invention, the first loosening elimination angle is from the start of pulling up the inner plug of the main body due to the rotation of loosening the cap to the cutting of the thin portion provided on the outer edge of the inner plug with respect to the second loosening elimination angle. It is larger than the sum of the fracture generation angles corresponding to the amount of pulling up. In this case, even if the inner plug is raised to the extent that the thin portion is cut, the cap does not rise, so that the misalignment between the broken portions can be considerably increased.

In yet another aspect of the invention, the cap inner screw is formed on the outer surface of the cap cylinder extending downward from the cap top plate, and the inner plug inner screw extends upward from the outer edge of the inner plug seal. It is formed on the inner surface of the inner plug cylindrical portion.

Another aspect of the present invention relates to the screw axis direction between the tip of the inner plug cylindrical portion provided with the inner plug inner screw constituting the second fastening portion and the cap in a state where the cap is attached to the main body before opening. The clearance is larger than the clearance in the screw axis direction between the tip of the cylindrical outer support part that extends downward from the top plate of the cap and covers the inner plug cylindrical part from the surroundings and the main body, and the inner circumference of the tip part of the outer support part. It has a burr storage part that is recessed in a stepped shape on the side. In this case, by rotating the cap in the loosening direction at the time of opening, the inner plug is screwed into the cap and moves relatively upward, so that the broken part of the inner plug is stored in the burr storage part and the main body. It does not come into contact with the broken part on the outer circumference of the As a result, it is possible to more reliably prevent the burrs remaining on the fractured portion from peeling off.

From yet another aspect of the present invention, the cap inner screw and the inner plug inner screw have a burr shape that facilitates pushing the inner plug into the support portion rather than pulling out the inner plug from the support portion on the cap side. In this case, when assembling the cap to the main body side, for example, by rotating the cap so as to tighten it, the burr shape allows the cap to be pushed into a predetermined position by forcibly overcoming the screw thread.

It is sectional drawing for demonstrating the sealing apparatus which concerns on one Embodiment of this invention. (A) and (B) are enlarged cross-sectional views explaining the peripheral structure of the second fastening part. It is an enlarged sectional view explaining the screw thread of the 2nd fastening part. It is sectional drawing explaining the fastening state before opening of the 2nd fastening part. It is an enlarged cross-sectional view explaining the arrangement relation, etc. around the 2nd fastening part. It is sectional drawing explaining the use method of the sealing apparatus shown in FIG. It is sectional drawing explaining the use method of the sealing apparatus shown in FIG. It is sectional drawing explaining the use method of the sealing apparatus shown in FIG. It is sectional drawing explaining the use method of the sealing apparatus shown in FIG. It is a partially enlarged sectional view explaining the method of avoiding rubbing each other at the cut part of the inner plug.

An embodiment of the container sealing device according to 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 welding. 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. The locking portions 34 are formed at intervals with respect to the welding portion 33 in the direction along the screw shaft AX, and by press-fitting the inner edge of the peripheral edge portion 2b of the container 2 at the intervals, the peripheral edge portion of the outer peripheral portion 11 is press-fitted. Auxiliary prevention of dropping from 2b. Further, on the outer peripheral surface of the main body outer peripheral wall 31 of the main body 10, a main body external screw 51 for screwing to the cap 20 is formed. 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.

As shown in FIGS. 1 and 2A, the inner plug 12 of the main body 10 has a disk-shaped sealing body 41 arranged at the bottom and a cylindrical shape extending upward from the outer edge of the sealing body 41. It is provided with an inner plug cylindrical portion 42. 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 having a spiral direction different from that of the main body outer screw 51 and having a reverse screw relationship 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 11a of the container 2. 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 tighten the inner plug 12 of the main body 10 to the cap cylindrical portion 23 of the cap 20. It constitutes a second fastening portion 50b for fixing. That is, the cap cylindrical portion 23 of the cap 20 functions as a support portion for capturing the inner plug 12 by the second fastening portion 50b and separating the inner plug 12 from the main body 10 or the outer peripheral portion 11. The first fastening portion 50a and the second fastening portion 50b have a spiraling relationship opposite to each other. Specifically, the first fastening portion 50a is a positive screw type screw portion that loosens by rotating counterclockwise, and the second fastening portion 50b is a reverse screw type screw portion that tightens by rotating counterclockwise. Is. That is, when the cap outer peripheral wall 22 of the cap 20 is rotated counterclockwise when viewed from above, the first fastening portion 50a is screwed back so as to loosen and rises, the cap cylindrical portion 23 of the cap 20 is viewed from above. The second fastening portion 50b is tightened to be rotated counterclockwise, and the second fastening portion 50b is further raised. Here, for example, the screwing direction or the screwing direction of the second fastening portion 50b will be described in detail. For the inner plug cylindrical portion 42 of the main body 10, the upper side along the screw shaft AX is the screwing direction in which screwing is performed by rotating counterclockwise with respect to the cap cylindrical portion 23 of the cap 20. The lower side along the screw shaft AX is in the counterclockwise direction in which the cap cylindrical portion 23 is screwed back. Further, for the cap cylindrical portion 23, the lower side along the screw shaft AX is in the screwing direction in which screwing is performed by rotating counterclockwise with respect to the inner plug cylindrical portion 42, and the screw shaft AX has a screw shaft. The upper side along the line is in the counterclockwise direction in which the screw is returned to the inner plug cylindrical portion 42.

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 inner plug 12 It is a burr-shaped protrusion that makes it easier to push the inner plug 12 into the cap cylindrical portion 23 as the support portion rather than pulling it out from the cap cylindrical portion 23 as the support portion. Specifically, as shown in FIG. 3, the inner plug internal screw 52, which is a female screw constituting the second fastening portion 50b, has a main body 10 on the tip side or the inside in a cross section as shown in the drawing passing through the screw shaft AX. The thread has a cross-sectional shape that is biased in the screw-back direction or the counter-screw-advancing direction (lower side) along the screw shaft AX. From a different point of view, the inner plug internal screw 52 has an angle (angle θ1) close to horizontal with the thread lower surface 52b, which is the engaging surface on the counter-threading side with the inner plug screw 54 when the inner plug 12 is displaced upward. ), And the thickness of the tip portion (H1b) is set thinner than the thickness of the base portion (H1a). That is, the inner plug internal screw 52 has a thread upper surface 52t, which is an engaging surface on the screwing side, inclined less than a thread lower surface 52b, which is an engaging surface on the anti-screw side (angle φ1 <θ1). It has become. On the other hand, the cap internal screw 54, which is a male screw constituting the second fastening portion 50b, has a screw-back direction or a screw-back direction along the screw shaft AX of the main body 10 on the tip side or the outside in the cross section as shown through the screw shaft AX. The thread has a cross-sectional shape that is biased in the anti-screw direction (upper side). From a different point of view, the cap internal screw 54 has an angle (angle θ2) at which the thread upper surface 54t, which is the engaging surface on the counter-threading side with the internal plug internal screw 52 when the inner plug 12 is displaced upward, is close to horizontal. ), And the thickness of the tip portion (H2b) is set thinner than the thickness of the base portion (H2a). That is, in the cap inner screw 54, the lower surface of the screw thread 54b, which is the engaging surface on the screwing side, is inclined less than the upper surface 54t of the thread, which is the engaging surface on the anti-screw side (angle φ2 <θ2). It has become. As is clear from the above, the inner plug inner screw 52 provided on the inner plug cylindrical portion 42 of the main body 10 and the inner cap inner screw 54 provided on the cap cylindrical portion 23 of the cap 20 are formed point-symmetrically in the vertical cross section. Has been done. The angle θ1 of the thread lower surface 52b of the inner plug inner screw 52 and the angle θ2 of the thread upper surface 54t of the cap inner screw 54 may exceed 90 °.

As shown in FIG. 4, with the cap 20 attached to the main body 10 before opening, a screw shaft AX is formed between the inner plug inner screw 52 and the cap inner screw 54 constituting the second fastening portion 50b. There is an overall clearance for both the top and bottom along the line. That is, the thread upper surface 52t of the inner plug inner screw 52 and the thread lower surface 54b of the cap inner screw 54 facing the thread upper surface 52t are separated from each other over the entire circumference, and the thread lower surface 52b of the inner plug inner screw 52. And the upper surface 54t of the thread of the screw 54 in the cap facing the screw thread 54 are separated from each other over the entire circumference. A clearance can be provided only between the upper surface of the screw thread 52t and the lower surface of the screw thread 54b, and no clearance can be provided between the lower surface of the screw thread 52b and the upper surface of the screw thread 54t. It is also possible to provide a clearance between the thread lower surface 52b and the thread upper surface 54t without providing a clearance between the thread lower surface 54b.

As shown in FIG. 5, with the cap 20 attached to the main body 10 before opening, the tip of the inner plug cylindrical portion 42 provided with the inner plug inner screw 52 constituting the second fastening portion 50b and the cap 20 The clearance H related to the screw shaft AX direction is the clearance H related to the screw shaft AX direction between the tip of the cylindrical outer support portion 24 that extends downward from the cap top plate 21 of the cap 20 and covers the inner plug cylindrical portion 42 from the periphery and the main body 10. Greater than d2 (minimum clearance). The clearance H is, for example, a thickness t or more and 3 mm or less of the thin portion 15. On the other hand, the clearance d2 is, for example, 0 mm or more and 0.5 mm or less. It is desirable that the clearance H is at least the thickness t of the thin portion 15 from the viewpoint of ensuring the rise of the inner plug 12 with respect to the cap 20.

Further, a burr storage portion 24r recessed in a stepped shape is formed on the inner peripheral side of the tip portion 24d of the outer support portion 24. The step amount h of the burr storage portion 24r with respect to the screw shaft AX direction is larger than the thickness t of the thin portion 15 of the main body 10. The thickness t is, for example, 0.05 mm or more and 0.3 mm or less.

As shown in FIG. 5, with the cap 20 attached to the main body 10 before opening, the outer peripheral surface 23j of the tip portion 23d of the cap cylindrical portion 23 and the inner peripheral surface 42j of the root portion 42p of the inner plug cylindrical portion 42. Is in contact with the radial direction (corresponding to the left-right direction on the drawing) orthogonal to the screw axis AX. The outer peripheral surface 23j and the inner peripheral surface 42j may be in contact with each other in the radial direction at a plurality of arcuate points separated from each other along the circumferential direction. Further, the outer peripheral surface 23k of the root portion 23p of the cap cylindrical portion 23 and the inner peripheral surface 42k of the tip portion 42d of the inner plug cylindrical portion 42 are in the radial direction orthogonal to the screw axis AX (corresponding to the left-right direction on the drawing). I'm in contact. The outer peripheral surface 23k and the inner peripheral surface 42k may be in contact with each other in the radial direction at a plurality of arcuate points separated from each other along the circumferential direction. Further, the inner peripheral surface 24m of the tip portion 24d of the outer support portion 24 and the outer peripheral surface 42m of the root portion 42p of the inner plug cylindrical portion 42 are in the radial direction orthogonal to the screw axis AX (corresponding to the left-right direction on the drawing). I'm in contact. The inner peripheral surface 24 m and the outer peripheral surface 42 m may be in contact with each other in the radial direction at a plurality of arcuate points separated from each other along the circumferential direction.

An example of an assembling method of the sealing device 100 will be described with reference to FIG. The main body 10 and the cap 20 engage the main body external screw 51 of the main body 10 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 viewed clockwise from the main body 10 side. By rotating or rotating the cap 20 clockwise when viewed from the cap 20 side, the first fastening portion 50a is tightened and screwed so as to be screwed. At that time, the inner plug inner screw 52 of the main body 10 and the cap inner screw 54 of the cap 20 formed at different places are formed as reverse screws, but the both inner screws 52 and 54 are pushed in as described above. Since it is formed in a burr shape that is easily deformed at the time, the screws are engaged with each other over the threads of the internal screws 52 and 54 while being deformed from each other. At this time, the tip portion 24d of the outer support portion 24 comes into contact with or approaches the upper surface of the outer connecting portion 31a of the thin-walled portion 15.

In the state where the main body 10 and the cap 20 are engaged with each other in this way, the distance between the main body 10 and the cap 20 is adjusted, and as shown in FIG. The tip portion 42d of the inner plug cylindrical portion 42 is housed in the recess E formed in the base portion. 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. In a state where the main body 10 and the cap 20 are wound in a proper position, a gap G corresponding to the clearance H is formed between the tip portion 42d of the inner plug cylindrical portion 42 and the cap top plate 21 of the cap 20. ing. By having the gap G, in the opening operation described later, the inner plug inner screw 52 and the inner cap inner screw 54 of the second fastening portion 50b are screwed together, a force for pulling up the inner plug 12 works, and the thin portion 15 is broken. In the meantime, the inner plug 12 moves toward the cap top plate 21 of the cap 20. That is, the pair of fracture surfaces of the thin portion 15 are displaced in the vertical direction. As a result, even if the cap 20 after separating the inner plug 12 is closed again, the fracture surface does not come into contact with each other. Therefore, it is possible to prevent the thin-walled burrs in the vicinity of the fracture surface from peeling off due to rubbing against each other. Further, it is possible to prevent the inner plug 12 itself from loosening and coming off from the cap 20.

As shown in FIG. 1, the sealing device 100 (main body 10 and cap 20) assembled as described above is inserted into the hole 2a of the container 2 such as a paper carton from the back side, and the inner peripheral surface of the hole 2a is inserted. The outer peripheral surface of the main body pedestal 32 of the main body 10 is fitted to the container 2 and joined to the container 2 by ultrasonic bonding, adhesive bonding, or the like.

Hereinafter, the opening operation of the sealing device 100 of the above embodiment will be described with reference to FIGS. 1, 6 to 9, and the like.

First, as shown in FIG. 1, the cap 20 is in the reference position or the initial position (in the state of being screwed in) before the rotation operation of the fastening portions 50a and 50b, and the inner plug 12 and the outer peripheral wall 31 of the main body are in the coupled state. Therefore, the opening 11a of the container 2 is in a sealed state.

As shown in FIG. 6, when the cap 20 is rotated in the direction of loosening the cap 20 from the state of FIG. 1, that is, counterclockwise, the cap 20 idles by a predetermined rotation angle, and during that time, the screw thread lower surface 52b of the inner plug internal screw 52 And the upper surface 54t of the thread of the screw 54 in the cap come into contact with each other. When the cap 20 is further rotated counterclockwise, the cap external screw 53 comes into contact with the main body external screw 51, as shown in FIG. 7. At this time, since the inner plug 12 is screwed with the cap 20 by the reverse screw, the tightening of the second screwed portion 50b is started, the inner plug 12 is moved upward, and the thin-walled portion 15 is moved upward accordingly. Stretched to. That is, the tightening of the second fastening portion 50b progresses slightly, and the inner plug 12 is moved upward while rotating counterclockwise with respect to the outer peripheral portion 11. Further, when the cap 20 is rotated counterclockwise, the cap 20 is moved upward by the screwing of the cap external screw 53 and the main body external screw 51, and during that time, the thin portion 15 of the main body 10 is further extended and broken. As shown in 8, the inner plug 12 is separated from the outer peripheral wall 31 of the main body and opened.

In this state, as shown in FIG. 8, in the inner plug 12, the upper surface 54t of the screw thread 54 of the cap inner screw 54 of the inner plug 12 comes into contact with the lower surface 52b of the screw thread 52 of the inner plug inner screw 52 of the inner plug cylindrical portion 42. At the same time, the tip portion 42d of the inner plug cylindrical portion 42 approaches or abuts on the lower surface 21t of the cap top plate 21 in the recess E, whereby the locked state by screwing is maintained and held by the cap 20. Further, the broken portion 15b on the inner plug 12 side of the thin-walled portion 15 is entirely housed in the burr storage portion 24r and is in a recess, so that it is avoided from coming into contact with the broken portion 15a on the connecting portion 31a side.

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, since the inner plug 12 is secured by the cap 20 and is in a state of being tightened to some extent with respect to the cap 20, 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 with reference to FIG. 9, when the cap outer 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, it is formed at the upper end of the main body outer peripheral wall 31. The lip portion 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 the outer surface of the thin portion 15. Since the inner plug 12 is pulled up in the direction of the cap top plate 21 of the cap 20, the fracture surface of the thin-walled portion 15 is displaced vertically and does not touch each other. Further, even when the cap 20 is tightened, the broken portion 15b on the inner plug 12 side is entirely housed in the burr storage portion 24r, and the tip portion 24d of the outer support portion 24 hits the outer surface of the thin-walled portion 15. , The broken portion 15b on the inner plug 12 side and the broken portion 15a on the outer peripheral portion 11 side do not come into contact with each other.

In the sealing device 100 of the present embodiment, when the cap 20 is assembled to the main body 10 before opening and the cap 20 is rotated in the loosening direction, the cap 20 is separated from the outer peripheral portion 11 of the main body 10 in the upward direction. The timing at which the inner plug 12 starts moving upward is set to be the same as or later than the timing at which the inner plug 12 starts moving upward away from the outer peripheral portion 11 of the main body 10.

Hereinafter, the conditions under which the timing at which the cap 20 starts moving upward is the same as or later than the timing at which the inner plug 12 starts moving upward will be described. In the state before opening, that is, in the state where the cap 20 is attached to the main body 10, at the first fastening portion 50a, the upper side of the screw thread of the cap external screw 53 provided on the cap 20 and the screw of the main body external screw 51 provided on the main body 10. It is in contact with the bottom of the mountain and is interfering. There is a gap on the opposite side (that is, between the lower side of the cap external screw 53 and the upper side of the main body external screw 51), and when the cap 20 is rotated counterclockwise and begins to loosen, the cap 20 runs idle and the cap No ascending force works on 20. When the cap 20 is rotated so as to be further loosened, the lower side of the cap external screw 53 of the cap 20 comes into contact with the upper side of the main body external screw 51 of the main body 10, and the cap 20 begins to rise with respect to the outer peripheral portion 11. Here, the angle of idling (play) until the cap 20 starts rotating and rises is given by the following equation (1).
α = D × 360 / R… (1)
α: First loosening elimination angle, rotation angle (°) until the first fastening portion 50a operates and the cap 20 starts to ascend.
D: Clearance (mm) between the lower side of the cap external screw 53 and the upper side of the main body external screw 51 before the rotation of the cap 20.
R: Lead (mm / rotation) of the first fastening portion 50a or the cap external screw 53
The clearance D means the clearance between the threads in the loosening direction of the first fastening portion 50a. Further, the screws 51 and 53 constituting the first fastening portion 50a may be single-threaded screws, multi-threaded screws, or screws divided in the circumferential direction.

On the other hand, the second fastening portion 50b including the inner cap screw 54 of the cap 20 and the inner plug inner screw 52 of the main body 10 is screwed or fitted to the first fastening portion 50a with a reverse screw. 1 Fastening portion 50a, that is, both screws 52 and 54 are tightened in reverse when the cap 20 is rotated so as to loosen it counterclockwise as described above. In order to cut the thin portion 15 provided with the score 16 and separate the inner plug 12 from the outer peripheral portion 11, the upper side of the inner plug inner screw 54 of the cap 20 and the lower side of the inner plug inner screw 52 of the main body 10 are required. It is necessary to abut and thread the inner plug 12 while pulling it upward with respect to the outer peripheral portion 11 by the cap cylindrical portion 23 of the cap 20. By preventing the inner plug 12 from being tightened or separated at the same time as the cap 20 starts to rise or loosen, the torque peak is deviated, and the inner plug 12 is raised and separated, which makes it relatively easy to open the seal. Further, by accelerating the tightening of the inner plug 12, the broken portion 15b on the inner plug 12 side can be reliably stored in the burr storage portion 24r, and after resealing, the broken portion 15b and the outer peripheral portion 11 on the inner plug 12 side can be securely stored. It becomes easy to avoid contact with the broken portion 15a on the side. In order to achieve such a state, in a state where the cap 20 is tightened, a clearance between the upper side of the cap inner screw 54 of the cap 20 and the lower side of the inner plug inner screw 52 of the main body 10 is determined. It is necessary to make the following, and the deviation (rotation angle of the cap 20) from the time when the cap 20 starts to loosen to the time when the inner plug 12 of the main body 10 starts to be pulled up is given by the following equation (2).
β = d × 360 / r ... (2)
β: Second loosening elimination angle, rotation angle (°) until the second fastening portion 50b operates and the inner plug 12 starts to be pulled up.
d: Clearance between the upper side of the cap inner screw 54 and the lower side of the inner plug inner screw 52 of the main body 10 before the rotation of the cap 20 r: Lead of the second fastening portion 50b or the cap inner screw 54 Note that the clearance d is It means the clearance between the threads in the tightening direction of the second fastening portion 50b. Further, the screws 52 and 54 constituting the second fastening portion 50b may be single-threaded screws, multi-threaded screws, or screws divided in the circumferential direction.

Based on the above premise, the timing at which the cap 20 starts moving upward away from the outer peripheral portion 11 of the main body 10 is the same as or later than the timing at which the inner plug 12 starts moving upward away from the outer peripheral portion 11 of the main body 10. Corresponding to the following condition setting. That is, the first loosening elimination angle α determined based on the clearance D between the threads in the loosening direction of the first fastening portion 50a and the lead R of the first fastening portion 50a is the tightening direction of the second fastening portion 50b. It is set so as to be equal to or larger than the second loosening elimination angle β determined based on the clearance d between the threads and the lead r of the second fastening portion 50b. This condition setting
α ≧ β… (3)
Means the relationship, and if you rewrite it,
D × 360 / R ≧ d × 360 r
D ≧ R × d / r… (4)
Will be satisfied. When such a condition is satisfied, the timing at which the cap 20 starts moving upward can be the same as or later than the timing at which the cap 20 starts moving upward, and the inner plug 12 side breaks at the time of resealing. It is advantageous from the viewpoint of avoiding contact between the portion 15b and the fractured portion 15a on the outer peripheral portion 11 side.

Actually, since the thin-walled portion 15 extends until the thin-walled portion 15 is cut, the amount of pulling up of the inner plug 12 until the thin-walled portion 15 is cut is given by the following equation (5).
β'= C × 360 / r… (5)
β': Breakage generation angle, rotation angle from the start of pulling up the inner plug 12 to the breakage of the thin-walled portion 15 C: The amount of pulling up of the inner plug 12 from the start of pulling up the inner plug 12 to the breakage of the thin-walled portion 15 5) can be rewritten as follows.
C = r × β'/ 360 ... (6)
By the way, in order to make it faster for the inner plug 12 to be separated from the outer peripheral portion 11 of the main body 10 by breaking than for the cap 20 to start moving upward away from the outer peripheral portion 11 of the main body 10.
α ≧ β ＋ β'… (7)
Means that the relationship is fulfilled,
D × 360 / R ≧ d × 360 / r + C × 360 / r
D ≧ R × (d + C) / r… (8)
To satisfy the relationship. That is, from the viewpoint of facilitating the separation of the inner plug 12 and avoiding contact between the broken portions 15b and 15a at the time of resealing, the first loosening elimination angle α is relative to the second loosening elimination angle β. It is set to be larger than the sum of the fracture generation angle β'corresponding to the amount of pulling up from the start of pulling up the inner plug 12 of the main body 10 to the time when the thin portion 15 of the outer edge is cut due to the rotation of loosening the cap 20. Is desirable.

The fracture formation angle β'from the start of pulling up the inner plug 12 to the breakage of the thin-walled portion 15 is not necessarily a definite amount, and instead of the fracture generation angle β', the inner plug 12 is equal to the thickness t of the thin-walled portion 15. It is also possible to use the deviation generation angle β "corresponding to increasing the value. In this case,
β ”= t × 360 / r… (9)
And
α ≧ β + β ”… (10)
Means that the relationship is fulfilled,
D ≧ R × (d + t) / r… (11)
To satisfy the relationship. That is, from the viewpoint of facilitating the separation of the inner plug 12, the first loosening elimination angle α is equal to the thickness of the thin portion 15 accompanying the rotation of loosening the cap 20 with respect to the second loosening elimination angle β. It is also possible to set it to be larger than the sum of the deviation generation angle β "corresponding to increasing.

According to the container sealing device described above, when the cap 20 is loosened, the timing at which the cap 20 starts moving upward away from the outer peripheral portion 11 of the main body 10 is the timing at which the inner plug 12 starts moving upward from the outer peripheral portion 11 of the main body 10. Since it is set to be the same as or later than the timing at which the movement starts upward away from the cap 20, it becomes easy to move the inner plug 12 relatively upward with respect to the cap 20 after opening, and the cap 20 is moved upward. Even when resealed, the broken portion 15b of the inner plug 12 and the broken portion 15a on the outer peripheral portion of the main body are less likely to come into contact with each other.

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, the 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 changed according to the application. .. 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 as appropriate according to the application.

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 second fastening portion 50b having a screwing relationship opposite to that of the first fastening portion 50a.

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 are not limited to those illustrated in FIG. 1 and the like, and are screw threads having a burr shape that facilitates pushing. Anything is sufficient, and various cross-sectional shapes can be obtained. Further, the inner plug inner screw 52 and the cap inner screw 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 parts.

In the above embodiment, the tip portion 24d of the outer support portion 24 is formed with a burr storage portion 24r having a stepped shape, but the stepped dent may not be provided and a flat surface may be formed. In this case, it is preferable that the tip portion 24d does not come into contact with the thin-walled portion 15.

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, 2a ... hole, 2b ... peripheral part, 10 ... main body, 11 ... outer peripheral part, 11a ... opening, 12 ... inner plug, 15 ... thin wall part, 16 ... score, 17 ... outer peripheral side Boundary part, 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 ... Middle Inner plug screw, 52b ... Thread upper surface, 52t ... Thread upper surface, 53 ... Cap outer screw, 54 ... Cap inner screw, 54b ... Thread lower surface, 54t ... Thread upper surface, 100 ... Sealing device, AX ... Screw shaft

Claims (5)

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 reverse screw type second fastening portion provided between the cap and the cap.
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. Is set to be the same as or later than the timing at which the movement starts upward away from the outer peripheral portion of the main body .
The clearance between the threads in the loosening direction of the first fastening portion and the first loosening elimination angle determined based on the lead of the first fastening portion are the clearance between the threads in the tightening direction of the second fastening portion. , It is set to be equal to or greater than the second loosening elimination angle determined based on the lead of the second fastening portion.
The first loosening release angle is such that the inner plug is raised by the thickness of the thin-walled portion provided on the outer edge of the inner plug of the main body as the cap is loosened and rotated with respect to the second loosening release angle. A sealing device that is larger than the sum of the corresponding deviation generation angles. The first loosening release angle is the pulling up from the start of pulling up the inner plug of the main body accompanying the rotation of loosening the cap to the cutting of the thin portion provided on the outer edge of the inner plug with respect to the second loosening release angle. The sealing device according to claim 1 , which is larger than the sum of the fracture formation angles corresponding to the amounts. 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 2 , 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. With the cap assembled to the main body before opening, the clearance between the tip of the inner plug cylindrical portion provided with the inner plug inner screw constituting the second fastening portion and the cap in the screw axial direction is the cap. It is larger than the clearance in the screw axial direction between the tip of the cylindrical outer support portion that extends downward from the top plate and covers the inner plug cylindrical portion from the surroundings and the main body.
The sealing device according to any one of claims 1 to 3 , further comprising a burr storage portion recessed in a stepped shape on the inner peripheral side of the tip end portion of the outer support portion. The cap inner screw and the inner plug inner screw constituting the second fastening portion have a burr shape that facilitates pushing the inner plug into the support portion rather than pulling out the inner plug from the support portion on the cap side. The sealing device according to any one of claims 1 to 4.

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