Container and vent mechanism

Abstract

To provide a container which enables a cap to be easily displaced from a gas removing position to a gas non-removing position, and a vent mechanism.SOLUTION: A vent mechanism 10 set on a top part of a container body for storing a fluid comprises: a base 11 set on the top part; and a cap 21 rotatably disposed with respect to the base 11. The base 11 is provided with a cylindrical part 12 to which the cap 21 is fastened, and a communication part 16 in communication with the inside of the container body. The outer peripheral surface of the cylindrical part 12 is provided with a base screw 17 for fastening the cap 21, and a falling prevention flange 18 positioned closer to the tip side than the base screw 17. The cap 21 is provided with a cap screw 26 engaged with the base screw 17 on the inner peripheral surface of a peripheral wall 23. The cap screw 26 is positioned below the falling prevention flange 18 to be engaged with the falling prevention flange 18.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a container having a vent mechanism and to the vent mechanism. [Background technology]

[0002] As shown in Patent Document 1, some airtight containers are provided with a vent that allows gas to be released when the internal pressure increases due to gas generated from the contained fluid. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6306584 Summary of the Invention [Problem to be solved by the invention]

[0004] In this type of container, a vent mechanism is attached to an attachment opening of the container body for attaching a vent. The vent mechanism is configured to open and close a communication portion connecting the internal space of the container body with the external space using a cap. In the non-venting position, the cap must tightly close the communication portion so as not to rattle relative to the container body, thereby sealing the container body. On the other hand, in the venting position, the cap must open the communication portion. As a result, the cap in the venting position has a certain amount of rattle relative to the container body. When moving the cap from the non-venting position to the venting position, it is necessary to return the cap from a state in which it rattles relative to the container body to a state in which the communication portion is securely closed. For example, if the opening serving as the communication portion is small, as in Patent Document 1, it is difficult to align the opening with the sealing surface of the cap (the closing member) when returning the cap from the venting position to the non-venting position. [Means for solving the problem]

[0005] A container for solving the above problem is a container in which a vent mechanism is set on the top surface of a container body that contains a fluid, the vent mechanism comprising a base portion set on the top surface and a cap that is rotatably arranged relative to the base portion, the base portion comprising a cylindrical portion to which the cap is fastened and a communicating portion that connects to the inside of the container body, the outer surface of the cylindrical portion comprising a base screw portion for fastening the cap and a fall prevention flange located further towards the tip than the base screw portion, the cap comprising a cap screw portion on the inner surface of the peripheral wall that engages with the base screw portion, the cap screw portion being located below the fall prevention flange and being able to engage with the fall prevention flange.

[0006] According to the above configuration, the communication portion can be screwed onto the cylindrical portion to displace the cap to the non-venting position, and the cap can be loosened to displace the cap to the venting position. Therefore, even if the cap loosens in the venting position, it can be reliably returned to the non-venting position simply by screwing it back. Furthermore, even if the cap loosens in the venting position due to loosening of the screw, the cap thread portion and the anti-detachment flange engage, preventing the cap from coming off the cylindrical portion and being lost.

[0007] In the container, the top surface may include an attachment opening, and the base may be attached to the top surface via the attachment opening. With this configuration, the container body and the vent mechanism can be separately attached to the container body.

[0008] In the container, the base portion may be integrally formed with the top surface portion. According to the above configuration, the sealing performance and strength between the base portion and the top surface portion can be improved. In the above container, the base portion further includes a connecting tube portion connected to the mounting opening, and a base seal portion extending from between the tube portion and the connecting tube portion to the outer surface of the container around the mounting opening, the lower end of the connecting tube portion protruding outward and having a protrusion portion that engages with the inner surface of the container around the mounting opening, and an mounting groove that engages with the opening end of the mounting opening may be formed on the outer surface of the connecting tube portion between the base seal portion and the protrusion portion.

[0009] According to the above configuration, the base portion is press-fitted into the mounting opening with the tip of the connecting tube portion as the insertion end. This engages the opening end of the mounting opening with the mounting groove, integrating the container body and the base portion. The base seal portion extends and is pressed against the outer surface of the container around the mounting opening, maintaining a tight seal.

[0010] The container may further include a filter disposed in the communication part. With this configuration, even when the cap is in the gas release position, the filter prevents the fluid inside from leaking from the communication part, while allowing the gas to circulate and be released to adjust the internal pressure.

[0011] In the above container, the inner surface of the cylindrical portion may be provided with an inner flange that forms a through hole in the center, and the filter may be arranged in a space surrounded by the inner flange and the inner surface of the cylindrical portion.

[0012] According to the above configuration, the filter can be disposed in the space surrounded by the inner flange and the inner circumferential surface of the cylindrical portion. The filter can be disposed in the space on the tip side of the cylindrical portion relative to the inner flange, or it can be disposed in the space on the container body side of the inner flange by press-fitting or adhesive. When the filter is disposed in the space on the tip side of the cylindrical portion relative to the inner flange, it is possible to prevent the filter from falling into the container body.

[0013] In the container, the filter may be a porous sintered filter. According to the configuration, the porous sintered filter has more rigidity than a waterproof / breathable member formed, for example, of a sheet, and can therefore be press-fit into the space surrounded by the inner flange and the inner circumferential surface of the cylindrical portion. If the filter is formed of a sheet, the sheet must be fixed with an adhesive, welding, or the like. In contrast, if the filter is a porous sintered filter, it can be simply press-fit into the space surrounded by the inner flange and the inner circumferential surface of the cylindrical portion, making the installation process simple and easy.

[0014] The vent mechanism for solving the above problem is a vent mechanism set on the top surface of a container body that contains a fluid, and comprises a base portion set on the top surface and a cap that is rotatably arranged relative to the base portion, the base portion comprises a tubular portion to which the cap is fastened and a communicating portion that connects to the inside of the container body, the outer surface of the tubular portion comprises a base screw portion for fastening the cap and a fall prevention flange located further towards the tip than the base screw portion, the cap comprises a cap screw portion on the inner surface of the peripheral wall that engages with the base screw portion, the cap screw portion is located below the fall prevention flange and is engageable with the fall prevention flange.

[0015] According to the above configuration, since the device is separate from the container body, the user can attach it to the desired container body. [Effects of the Invention]

[0016] According to the present invention, the cap can be easily displaced from the gas venting position to the non-gas venting position while preventing the cap from coming off the cylindrical portion. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view of a container according to the first embodiment. [Figure 2] FIG. 2 is an exploded perspective view of a vent mechanism provided in the container in the first embodiment. [Figure 3]FIG. 3 is a perspective view showing the relationship between the base portion and the filter in the first embodiment. [Figure 4] FIG. 4 is an exploded perspective view showing the relationship between the base portion and the mounting opening in the first embodiment. [Figure 5] FIG. 5 is a perspective view of the cap in the first embodiment. [Figure 6] FIG. 6 is a cross-sectional view showing the relationship between the cap and the base portion in the gas release position in the first embodiment. [Figure 7] FIG. 7 is a cross-sectional view showing the relationship between the cap and the base portion in the non-venting position in the first embodiment. [Figure 8] FIG. 8 is a cross-sectional view of the vent mechanism according to the second embodiment, showing the relationship between the base portion and the mounting opening. [Figure 9] FIG. 9 is a cross-sectional view of the vent mechanism according to the third embodiment, showing the relationship between the base portion and the attachment opening. DETAILED DESCRIPTION OF THE INVENTION

[0018] A container to which the present invention is applied will be described below with reference to the drawings. [First embodiment] [Overall structure] As shown in FIG. 1, the container 1 to which the present invention is applied is a so-called pail can. The container 1 includes a container body 2 and a vent mechanism 10. The container body 2 is, for example, a sealed container made of synthetic resin. Alternatively, it is a sealed container made of metal. The container 1 stores a fluid. The fluid may be a liquid, gel, powder, granules, or the like, and has a flowable shape. The container body 2 is configured as a sealed container to prevent the fluid from leaking during transportation, etc. The container body 2 includes a main body 3 and a lid 4. The main body 3 has an opening on its top surface. The lid 4 is the main component constituting the top surface and closes this opening. For example, the lid 4 has a gasket disposed at the portion where it fits with the opening. This allows the lid 4 to ensure that the opening is sealed.

[0019] The lid 4 has a recess 5 recessed toward the inside of the container body 2. The recess 5 has a bottom surface 6. The vent mechanism 10 is set on the bottom surface 6 (see FIG. 4). The recess 5 has a depth such that, for example, the top surface of the cap of the vent mechanism 10 protrudes slightly from the surrounding surface of the recess 5. In addition, the recess 5 has a size in plan view that provides a gap between its peripheral wall and the peripheral wall 23 of the cap 21 large enough to allow a finger or the like to be inserted between the recess 5 and the peripheral wall 23 to rotate the vent mechanism 10. As an example, the recess 5 is a circular recess. The bottom surface 6 has an attachment opening 7 for attaching the base portion 11 of the vent mechanism 10 (see FIG. 2). The attachment opening 7 is, for example, a rectangular through-hole. The attachment opening 7 is a hole that connects the internal space of the container body 2 with the external space.

[0020] [Vent mechanism] 2, the vent mechanism 10 includes a base portion 11 attached to the recess 5, a cap 21 fastened to the base portion 11, and a filter 31 disposed in the communication portion 16 of the base portion 11. The base portion 11 and the cap 21 are molded articles made of synthetic resin such as polypropylene.

[0021] [Base part] As shown in FIGS. 3 and 4, the base portion 11 includes a cylindrical portion 12, a connecting cylindrical portion 13, a base seal portion 14, and an inner flange 15.

[0022] The tubular portion 12 has a cylindrical shape. The inner space of the tubular portion 12 defines a communication portion 16, which is a space extending in the vertical direction. The tubular portion 12 is the portion to which the cap 21 is fastened, and its outer peripheral surface is provided with a base screw portion 17, which is a spiral ridge. The base screw portion 17 is, for example, a single-start thread. The tubular portion 12 also defines a tubular end 12c at its tip, which is provided with a fall-off prevention flange 18 that protrudes outward. In the first embodiment, the base screw portion 17 and the fall-off prevention flange 18 have heights that allow the cap screw portion 26 of the cap 21 to engage with them. For example, the base screw portion 17 is taller than the fall-off prevention flange 18.

[0023] The connecting tubular portion 13 is provided on the lower portion of the tubular portion 12. The connecting tubular portion 13 is press-fitted into the mounting opening 7 and has a rectangular tubular shape corresponding to the mounting opening 7. The connecting tubular portion 13 has a protrusion 13a that protrudes outward from the tip, which is the lower end. The protrusion 13a has a guide surface 13b that slopes from the lower end toward the base seal portion 14.

[0024] The base seal portion 14 protrudes outward from between the tubular portion 12 and the connecting tubular portion 13. The base seal portion 14 protrudes, for example, in a circular shape. The tubular portion 12 is above the base seal portion 14, and the connecting tubular portion 13 is below the base seal portion 14. The base seal portion 14 is pressed against the periphery of the mounting opening 7 on the bottom surface 6 of the recess 5.

[0025] The projection 13a and the base seal 14 are spaced apart by a distance corresponding to the thickness of the opening end 7a of the mounting opening 7, forming a mounting groove 14a. The base 11 is press-fitted into the mounting opening 7 with the projection 13a as the insertion end. The projection 13a is provided with a guide surface 13b, which allows it to be smoothly press-fitted into the mounting opening 7. When the connecting tube 13 is press-fitted into the mounting opening 7, the opening end 7a fits into the mounting groove 14a. At this time, the base seal 14 is pressed against the surface of the bottom 6. This also maintains the airtightness between the base 11 and the container body 2.

[0026] A communication section 16, which is a space extending in the vertical direction, is formed from the inside of the tubular section 12 to the inside of the connecting tubular section 13. The inside of the tubular section 12 is provided with an inner flange 15 located below the tip. The inner flange 15 has a through-hole 15a in its center. The inner space of the tubular section 12, which is part of the communication section 16, is divided into upper and lower sections by the inner flange 15, and is provided with an upper space 12a and a lower space 12b. The upper space 12a is a cylindrical space with the inner flange 15 as its bottom surface and an open top surface, while the lower space 12b is a cylindrical space with the inner flange 15 as its top surface and an open bottom surface that connects to the inner space of the connecting tubular section 13. The upper space 12a and the lower space 12b are in communication with each other via the through-hole 15a. In the first embodiment, the through-hole 15a is circular.

[0027] A filter 31 is disposed in the upper space 12a. The filter 31 is, for example, a waterproof and moisture-permeable material. The filter 31 has a disk shape that matches the shape of the upper space 12a. The filter 31 closes the through-hole 15a. That is, a material is selected that can release the gas generated inside the container body 2 when the gas becomes high pressure, while preventing fluids such as liquids from leaking into the external space through the communication portion 16. A porous sintered filter made by sintering a synthetic resin such as polypropylene is preferred as the waterproof and moisture-permeable material. Such a sintered filter is a porous body with a certain degree of rigidity and can be placed in the upper space 12a from the upper open end of the tubular portion 12 by press-fitting.

[0028] Alternatively, a sheet material made of a composite of a stretched polytetrafluoroethylene film and a polyurethane polymer may be used. In the case of a sheet material, it can be fixed to the surface of the inner flange 15 by a fixing means such as adhesive or welding.

[0029] 〔cap〕 As shown in Fig. 5, the cap 21 includes a main surface portion 22 and a peripheral wall 23. The main surface portion 22 has a disk shape corresponding to the size of the cylindrical end 12c. The inner surface of the main surface portion 22 includes an annular rib 24 that fits into the cylindrical end 12c. By fitting the rib 24 into the cylindrical end 12c, the cap 21 is secured to the cylindrical portion 12 with a tight seal and is positioned relative to the cylindrical portion 12.

[0030] The peripheral wall 23 has an anti-slip protrusion 25 on its outer circumferential surface. The anti-slip protrusion 25 is a protrusion that extends in the vertical direction on the peripheral wall 23 and prevents the cap 21 from slipping when it is rotated relative to the base part 11.

[0031] A cap thread portion 26 is provided on the inner surface of the peripheral wall 23. The cap thread portion 26 is a helical ridge that can engage with the base thread portion 17 and the fall-off prevention flange 18. In the first embodiment, the cap thread portion 26 is provided on the inner surface of the peripheral wall 23 for a length of 3 / 4 of the circumference. The length of the cap thread portion 26 is not limited to this and may be, for example, one circumference or more than one circumference. When attaching the cap 21 to the tubular portion 12, the cap 21 is first press-fitted so as to climb over the fall-off prevention flange 18. In this state, the cap 21 can rotate relative to the tubular portion 12. The cap 21 is then tightened to the tubular portion 12 by engaging the cap thread portion 26 with the cap thread portion 26.

[0032] [Method of Use (Function of First Embodiment)] First, in the container body 2, the fluid is stored in the main body 3. Then, the main body 3 is closed by the lid 4. If the base 11 constituting the vent mechanism 10 is not attached to the lid 4, the base 11 is attached to the mounting opening 7. Specifically, the connecting tubular portion 13 is press-fitted into the mounting opening 7 with the protrusion 13a as the insertion end. As a result, the opening end 7a fits into the mounting groove 14a. At the same time, the base seal portion 14 is pressed against the bottom surface 6 of the recess 5. This ensures a tight seal between the bottom surface 6 and the base 11. The fluid can also be poured into the tubular end 12c of the tubular portion 12 with the base 11 attached to the mounting opening 7. Then, a filter 31 is placed in the upper space 12a.

[0033] The cap 21 is then attached to the tubular portion 12. When attaching the cap 21 to the tubular portion 12, the cap thread portion 26 is first press-fitted so that it overcomes the cap-retaining flange 18. As shown in FIG. 6, in this state, the cap thread portion 26 is only engaged with the cap-retaining flange 18, and there is some play in the vertical direction, etc., to the extent that it does not come off the tubular portion 12. The play is caused by the cap thread portion 26 moving freely between the cap-retaining flange 18 and the base thread portion 17. Therefore, a gap is formed between the tubular end 12c and the main surface portion 22, and the container body 2 is not sealed. Then, as shown in FIG. 7, the cap 21 is tightened to the tubular portion 12 by engaging the cap thread portion 26 with the cap thread portion 26. Then, the rib 24 fits into the tubular end 12c, sealing the container body 2. The cap 21 can be simply fastened to the cylindrical portion 12 by screwing, and therefore there is no need to align it with the cylindrical portion 12. The container 1 is transported in this sealed and leak-proof state.

[0034] The containers 1 are stacked during transportation, storage, etc. Even in such a case, the main surface portion 22 of the cap 21 constituting the vent mechanism 10 protrudes slightly from the recessed portion 5 of the container body 2.

[0035] Depending on the environment during transportation, etc., gas may be generated from the fluid content of the container 1. This increases the internal pressure, causing the container 1 to expand. On the other hand, the container 1 may dent when cooled. In such cases, the vent may be opened to equalize the pressure inside and outside the container 1. In such cases, the vent mechanism 10 is used as follows.

[0036] As shown in Figure 7, during transportation, the cap 21 is fastened to the tubular portion 12 by engaging the cap thread portion 26 with the cap thread portion 26. The rib 24 is fitted to the tubular end 12c, creating a sealed state. That is, the cap 21 is in a non-venting position where generated gas cannot be released. As shown in Figure 6, the cap 21 can be displaced from the non-venting position to the venting position by loosening the screw. The cap 21 protrudes slightly from the recess 5, making it easy to rotate when loosening the screw.

[0037] In the gas release position, the cap 21 is in a state where the cap thread portion 26 moves freely between the anti-detachment flange 18 and the base thread portion 17, placing the cap 21 in an unsealed gas release position that allows gas release. In this state, gas flows through the filter 31, allowing the pressure inside and outside the container 1 to be equalized. During this time, vibrations may cause the fluid level in the container 1 to sway, causing the fluid to move toward the communication portion 16. Even in such a case, the filter 31 is a waterproof, breathable material, preventing the fluid from leaking outside the base 11. Furthermore, even when the cap 21 is in the gas release position, the cap 21 does not separate from the base 11, preventing the cap 21 from being lost during the gas release process.

[0038] The cap 21 is then rotated from the degassing position back to the non-degassing position. At this time, the cap 21 is simply tightened onto the cylindrical portion 12 by screw action, and no work such as alignment with the cylindrical portion 12 is required, making it easy to do so.

[0039] [Effects of the first embodiment] The container 1 described above can provide the following effects. (1) The communicating portion 16 can be screwed onto the tubular portion 12 to displace the cap 21 to the non-venting position, and can also be displaced to the venting position by loosening the cap 21. Therefore, even if the cap 21 is loose relative to the tubular portion 12 in the venting position, it can be reliably returned to the non-venting position simply by the simple operation of screwing it onto the tubular portion 12.

[0040] (2) Even if the cap 21 loosens its screw action at the degassing position, the cap screw portion 26 of the cap 21 engages with the anti-fall flange 18, preventing the cap 21 from coming off the tubular portion 12 and preventing it from being lost.

[0041] (3) The base portion 11 is press-fitted into the mounting opening 7 with the tip of the connecting tube portion 13 as the insertion end. As a result, the opening end 7a of the mounting opening 7 is engaged with the mounting groove 14a, and the container body 2 and the base portion 11 are integrated. In addition, the base seal portion 14 extends and is pressed against the outer surface of the container 1 around the mounting opening 7. This maintains the airtightness between the base portion 11 and the container body 2.

[0042] (4) Even when the cap 21 is in the gas release position, the filter 31 prevents the fluid inside from leaking from the communication portion 16, while allowing the gas to circulate and be released, thereby adjusting the internal pressure.

[0043] (5) The filter 31 can be disposed in the space surrounded by the inner flange 15 and the inner circumferential surface of the tubular portion 12. The filter 31 is disposed in the upper space 12a on the tip side of the tubular portion 12 relative to the inner flange 15. Because the filter 31 is disposed in the upper space 12a on the tip side of the tubular portion 12 relative to the inner flange 15, it is possible to prevent the filter 31 from falling off into the container body 2.

[0044] (6) When the filter 31 is a porous sintered filter, the sintered filter has more rigidity than, for example, a waterproof / breathable member made of a sheet, and has enough rigidity to withstand press-fitting. Therefore, it can be placed by press-fitting into the upper space 12a surrounded by the inner flange 15 and the inner circumferential surface of the tubular portion 12. This simplifies and facilitates placement in the upper space 12a. Note that when the filter 31 is made of a sheet, the sheet material can be fixed by adhesive, welding, or the like.

[0045] (7) Because the vent mechanism 10 is separate from the container body 2, the user can attach it to the desired container body 2. In this case, the user can form the mounting opening 7 in the container body 2 by themselves. This allows the user to easily attach the base portion 11 to the mounting opening 7. Alternatively, the user can form the mounting opening 7 in the ceiling portion of the container body 2 later and then attach the vent mechanism 10 to the formed mounting opening 7.

[0046] Second Embodiment 8, the base portion 11 may be attached to the attachment opening 7 by screwing. In this case, the connecting tube portion 41 is formed in a cylindrical shape. The outer circumferential surface of the connecting tube portion 41 is provided with a connecting screw portion 42 formed of a helical ridge.

[0047] Meanwhile, a threaded cylindrical portion 43 is provided around the mounting opening 7 in the container body 2, facing the internal space of the container body 2. A container threaded portion 44 corresponding to the connection threaded portion 42 is provided on the inner peripheral surface of the threaded cylindrical portion 43. The container threaded portion 44 is also composed of a spiral ridge.

[0048] According to this configuration, the connecting tube portion 41 can be attached in a sealed state by tightening the connecting thread portion 42 onto the container thread portion 44. Also, the work of attaching the connecting tube portion 41 to the attachment opening 7 is easy.

[0049] Third Embodiment As shown in FIG. 9, the base portion 11 may be integral with the container body 2. In this case, the base portion 51 is continuous and connected to the bottom surface 6 of the recess 5. The base portion 51 has a cylindrical portion 12 rising up from the bottom surface 6. The base portion 11 is molded integrally with the container body 2. With this configuration, it cannot be added to the container body 2 later, unlike the base portion 11. On the other hand, because the base portion 51 is integral with the bottom surface 6, it is possible to improve the sealing performance.

[0050] [Modification] The container 1 can also be implemented by further modifying it as appropriate as follows: In addition to the above-described embodiments, the container 1 may also be implemented in the following modified examples, or in a form that combines at least two mutually consistent modified examples.

[0051] The inner flange 15 may be omitted. Furthermore, the inner flange 15 does not have to be configured as a continuous annular plate in the circumferential direction. For example, the inner flange 15 may have radial slits, or the slits may be made into larger gaps. In other words, the inner flange 15 only needs to function as a partition plate that prevents the filter 31 from entering the inside of the container body 2. Furthermore, it does not prevent the filter 31 from being placed in the lower space 12b.

[0052] The shape of the through-holes 15a is not limited to a circle, but may be a polygon such as a triangle or a rectangle. The filter 31 may be omitted. For example, the communication part 16 may be provided with a mesh that is integral with the tubular part 12. Although this configuration is less effective than using the filter 31, it is still possible to prevent the outflow of the fluid stored in the container body 2.

[0053] The container body 2 may be configured so as to omit the recess 5 for providing the vent mechanism 10. Furthermore, even when the vent mechanism 10 is provided on the lid 4 that constitutes the top surface, the position where the vent mechanism 10 is provided may be the center of the lid 4, or may be offset in any direction from the center. The top surface includes not only the lid 4 but also the outer peripheral side surface of the main body 3 near the lid 4. Therefore, the vent mechanism 10 may be provided on the outer peripheral side surface of the main body 3 near the lid 4.

[0054] The bottom surface of the container body 2 may have legs that protrude from the surface surrounding the recess 5 and are higher than the top surface of the cap 21. This allows the container 1 to stably stack additional containers 1 on top of the lid 4.

[0055] The depth of the recess 5 may be such that the top surface of the cap 21 does not protrude from the surface surrounding the recess 5. In this case, the container 1 can be stably stacked on top of the lid 4 without providing legs on the bottom surface of the container body 2. [Explanation of symbols]

[0056] 1…Container 2...Container body 3...Main body 4...Lid 5...Recess 6...Bottom 7...Installation opening 7a...Open end 10...Vent mechanism 11...Base 12...Cylinder part 12a...Upper space 13...Connecting tube 13a...Protrusion 14...Base seal part 14a...Mounting groove 15...Inner flange 15a...Through hole 16…Communication part 17...Base screw part 18...Flange to prevent falling off 21...Cap 23...peripheral wall 26...Cap screw part 31...Filter

Claims

1. A container having a vent mechanism set on the top surface of a container body that contains a fluid material, the vent mechanism includes a base portion set on the top surface portion and a cap rotatably disposed with respect to the base portion, the base portion includes a cylindrical portion to which the cap is fastened and a communication portion that communicates with the inside of the container body, the outer peripheral surface of the cylindrical portion includes a base screw portion for fastening the cap, and a fall-off prevention flange located on the tip side of the base screw portion, the cap has a cap thread portion on an inner circumferential surface of a peripheral wall thereof that engages with the base thread portion; The cap screw portion is located below the fall-off prevention flange and is engageable with the fall-off prevention flange. container.

2. The top surface portion has an attachment opening, The base portion is attached to the top surface portion through the attachment opening. The container of claim 1.

3. The base portion is integrally formed with the top surface portion. The container of claim 1.

4. The base portion is a connecting tube portion connected to the mounting opening; a base seal portion extending from between the cylindrical portion and the connecting cylindrical portion to an outer surface of the container around the mounting opening, a lower end of the connecting tube portion having a protrusion that protrudes outward and engages with the inner surface of the container around the mounting opening; An attachment groove is formed on the outer peripheral surface of the connecting tube portion between the base seal portion and the protrusion, and the opening end of the attachment opening is engaged with the attachment groove.

3. The container of claim 2.

5. The communication device further includes a filter disposed in the communication portion.

5. A container according to any one of claims 1 to 4.

6. The inner peripheral surface of the cylindrical portion has an inner flange that defines a through hole at the center, The filter is disposed in a space surrounded by the inner flange and the inner circumferential surface of the cylindrical portion.

6. The container of claim 5.

7. The filter is a porous sintered filter.

6. The container of claim 5.

8. A vent mechanism set on a top surface of a container body that contains a fluid material, a base portion set on the top surface portion; and a cap rotatably arranged with respect to the base portion, the base portion includes a cylindrical portion to which the cap is fastened and a communication portion that communicates with the inside of the container body, the outer peripheral surface of the cylindrical portion includes a base screw portion for fastening the cap, and a fall-off prevention flange located on the tip side of the base screw portion, the cap has a cap thread portion on an inner circumferential surface of a peripheral wall thereof that engages with the base thread portion; The cap screw portion is located below the fall-off prevention flange and is engageable with the fall-off prevention flange. Vent mechanism.

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