EXTRACTION TOOL

Abstract

 The present invention is to provide a pouring device (1) with a closable cap that can pour the content to the last, when pouring the content from a container. By molding a pouring device body (2) and a cap (6) by integral molding, wherein the pouring device body comprises an inner tube part (4) with a small diameter that can be inserted in the container as the container is opened, and having an opening (24) on the tip end, and an outer tube part (3) with a large diameter, and having a pour opening and located outside the container, wherein the inner tube part and outer tube part are connected by being communicated each other, and wherein the cap is connected via a hinge (5) in the vicinity of the pour opening of the outer tube part (3), enabling to close and reopen the pour opening. A hole (23) is formed on the upper side of the periphery of the inner tube part (4) corresponding to the opposite position in the circumferential direction of the hinge connecting part of the outer tube (3) so that the liquid of the container can be poured to the last drop. Projection (41) is provided at a level upper than the hole (23) to keep the pouring device body (2) stable by abutting from the inner surface side of the container to the wall surface of the container when opening the cap, to make the abutting surface (32) of the lower end of the outer tube part (3) with the container to be an inclined surface inclined at 10 - 45 degree.

Description

Technical Field

[0001] The present invention relates to a pouring device for drinking directly or pouring the content of a container by opening a tightly-sealed container containing liquid beverages such as milk, liquid seasonings such as seasoning soy sauce, or fluid foods.

Background Art

[0002] Conventionally, as a tightly-sealed container having resealability, that can store heeltap, and being suitable to fill products other than beverages such as seasoning soy sauce, and jiao-zi sauce, the following tightly-sealed container has been proposed: a tightly-sealed container having a pouring pipe and pipe insertion hole, provided with a holding member to hold the pipe in a state inserted to the pipe insertion hole, wherein the holding member is formed in a tubular form, to which tip end is provided with a flange, the flange being fixed to the outer surface of the peripheral part of the pipe holding hole, and wherein a bulkhead is provided transversely in the holding member, a pipe insertion hole is provided on the bulkhead, and a cap is covering detachably to the rear end part of the holding member (for example, see Patent-Document 1).

[0003] Further, the following is known: a straw comprising a tubular pouring device body containing an inner tube part formed on the tip end side, to be inserted in the container when the container is opened, and an outer tube part formed on the rear end side and located outside of the container, wherein a groove forming surface is formed on the outer periphery of the rear end side of the inner tube part, extending from the inner surface side of the container to the top wall of the container, bisecting at right angles with the axis of the pouring device body; that an abutting surface is formed on the outer periphery of the tip end side of the outer tube part, extending from the outer surface side of the container to the top wall of the container, and bisecting at right angles with the axis of the pouring device body; that a supporting grove is formed by the groove forming surface and abutting surface; and that a hole is formed on the inner tube part; or a straw having resealability by making the inner tube part of the straw located in the container a double tube, and moving the double tube relatively to open and close the hole (for example, see Patent-Document 2).

[0004] 

Patent-Document 1: Japanese Laid-Open Patent Application No. 2001-199464

Patent-Document 2: Japanese Laid-Open Patent Application No. 2002-249172

Disclosure of the Invention

An Object to be Solved by the Invention

[0005] The conventionally known pipe described in the above-mentioned Patent-Document 1, is held firmly to the container by the holding member. However, it is necessary that the holding member is fixed on the outer surface of the periphery of the pipe insertion hole by the flange provided on its end, as well as to provide a bulkhead and a pipe holding hole transversely in the holding member, which makes the manufacturing process of the tightly-sealed container more complex.

[0006] As for the conventionally known straw described in the above-mentioned Patent-Document 2, as resealability is conferred by making the inner tube part of the straw a double tube, it is necessary to remove the straw from the container each time to move relatively the double tube located in the container. By repeating fitting and removing the straw to and from the container, the supporting condition between the straw insertion hole and supporting groove decreases, which results that the positioning cannot be made accurately when positioning the straw with the supporting groove, or the content may leak from between the supporting groove and straw insertion hole when pouring the content.

[0007] Further, as for the above-mentioned conventionally known straw, as the supporting groove is provided on the surface bisecting with right angles with the axis of the pouring device body, when inserting the straw in the container upon opening the container, the straw insertion hole of the container is pushed and expanded at least to the size of the straw (when the supporting groove is formed by a guard, to the diameter of guard), which results that the positioning cannot be made accurately when positioning the straw with the supporting groove, the pouring device may be not stable, or the content may leak from between the supporting groove and straw insertion hole when pouring the content.

[0008] The object of the present invention is to provide a reopenable and hygienic pouring device with a cap, that can be easily mounted to the opening part (straw insertion hole) of the container, which causes no liquid leakage when pouring the content liquid from the container, and enabling to pour almost to the last drop.

Means to solve the object

[0009] The present inventors made a keen study to solve the above object. They found out that by making a pouring device comprising a pouring device body and a cap which are molded integrally, wherein the pouring device body comprises an inner tube part which is inserted in the container as the container is opened, and an outer tube part located outside of the container, which are fixed by being communicated each other, and wherein the cap is connected via a hinge to the vicinity of the pouring opening part of the outer tube body, and can close and re-open the pouring opening; and wherein a hole for pouring the liquid of the container to the last drop is formed on the periphery of the upper side (outer tube part side) of the inner tube, to provide a reopenable and hygienic pouring device with a cap,
it is possible to mount the pouring device easily and tightly to the opening part (straw insertion hole) of the container, and to pour the liquid content almost to the last drop, without liquid leakage, pulsating, flashing, or dripping, when pouring the liquid content. The present invention has been thus completed.

[0010] Further, according to the pouring device of the present invention wherein an abutting surface of the lower end of the outer tube (inner tube side) with the container, is formed as an inclined surface which is inclined at a certain angle downward and backward against the surface bisecting with a right angle with the axis of the pouring device body, particularly when it is a container having a flat top wall, the outer tube part of the pouring device is mounted being inclined against the container top wall. Therefore, when pouring the content, particularly when pouring into a glass etc. , it can be performed easily by inclining slightly the container.

[0011] Moreover, by at least providing projections on the outer periphery surface of the inner tube on the upper side of the hole, for example continuous flanged projections on the entire periphery of the inner tube part, discontinuous flanged projections on the periphery of the inner tube part, or short projections having a width in the circumferential direction which is narrower than that of the hole, they found out that projections abut from the inner surface side of the container to the wall surface of the container when opening the cap, and that the pouring device body is kept stable.

[0012] In other words, the present invention relates to ("1") a pouring device comprising a pouring device body and a cap which are molded integrally,
wherein the pouring device body comprises an inner tube part, which is at lower side, with a small diameter that can be inserted in a container as the container is opened, and an outside tube part, which is at upper side, with a large diameter, which is located outside of the container and has a pour opening; wherein the cap is connected via a hinge to the vicinity of the pour opening of the outer tube part, and can close and reopen the pour opening;
wherein a hole is formed on the upper side of the periphery (outer tube part side) of the inner tube part so that liquid of the container can be poured to the last drop.

[0013] Further, the present invention relates to ("2") the pouring device according to "1", wherein the hole is formed on the upper side of the periphery (outer tube part side) of the inner tube part, corresponding to the opposite position in the circumferential direction of the hinge connecting part of the outer tube part; ("3") the pouring device according to "1" or "2", wherein the inner tube part is tapered so that the outer diameter becomes smaller toward the tip end; ("4") the pouring device according to "3", wherein the taper angle is 0.5 - 5 degree; ("5") the pouring device according to any one of "1" to "4" wherein the inner tube part has a maximum diameter of 8 - 11 mm; ("6") the pouring device according to any one of "1" to "5", wherein the tip end of the inner tube part has a tip end opening inclined downward and forward against its axis; ("7") the pouring device according to "6", wherein the tip end of the inner tube part has a tip end opening inclined downward and forward at 30 - 40 degree in a planar view against the surface bisecting at right angles with its axis; ("8") the pouring device according to any one of "1" to "7", wherein a flanged supporting flange is formed on the outer periphery part of the lower end of the outer tube part; ("9") the pouring device according to any one of "1" to "8", wherein a flanged flange for connecting hinges is formed on the outer periphery part of the upper part of the outer tube part; ("10") the pouring device according to any one of "1" to "9", wherein the abutting surface of the lower end of the outer tube part (inner tube part side) with the container is formed as an inclined surface which is inclined at a certain angle downward and backward against the surface bisecting at right angles with the axis of the pouring device body; ("11") the pouring device according to "10", wherein the abutting surface is inclined at 20 - 30 degree against the surface bisecting at right angles with the axis of the pouring device body; ("12") the pouring device according to any one of "1" to "11", wherein projections are provided at least on the outer periphery part on the upper side of the inner tube side, corresponding to the opposite position in the circumferential direction with the hinge connecting part of the outer tube part, and at a position upper than the hole when opening the cap; ("13") the pouring device according to "12", wherein a projection with a height of 0.4 - 0.6 mm is provided; ("14") the pouring device according to any one of "1" to "13", wherein a projection is provided so that the upper end of the projection is located 4 - 5 mm from the abutting surface at the lower end of the outer tube part; ("15") the pouring device according to any one of "1" to "14", wherein a projection is formed as a flanged projection continuing on the entire periphery of the inner tube part; ("16") the pouring device according to "15", wherein the continuous flanged projection is formed to be parallel with the abutting surface of the lower end of the outer tube part, or so that the distance with the abutting surface increases in the forward direction; ("17") the pouring device according to "15" or "16", wherein the continuous flanged projection is formed so that the lower end part of the flanged projection located on the most upper level is located upper than the upper end part of the flanged projection located on the lowest level; ("18") the pouring device according to any one of "1" to "14", wherein the projection is formed as a discontinuous projection on the periphery of the inner tube part; ("19") the pouring device according to "18", wherein the discontinuous flanged projection is formed as a screw-type at a discontinuous site; ("20") the pouring device according to any one of "1" to "14", wherein the projection is formed as a short projection having a width in the circumferential direction that is narrower than that of the hole; and ("21") the pouring device according to "20", wherein the short projection has a width in the circumferential direction of 3-5 mm, which is narrower than that of the hole.

[0014] Further, the present invention relates to ("22") the pouring device according to any one of "1" to "21", wherein the hinge connecting the outer tube part and the cap comprises a first hinge and a second hinge, the first hinge connecting the backward of the upper end part of the outer tube part and the backward of the lower end part of the cap, and being formed as a matched pair of hinges having a thin hinge at the central part in the front-back direction, the second hinge being provided between the pair of the first hinges, as a pair of opposing V-shapes; ("23") the pouring device according to any one of "1" to "22" being formed integrally by injection molding.

[0015] Moreover, the present invention relates to ("24") a liquid container having a circular or oval opening part to which the pouring device according to any one of "1" to "23" is attached; ("25") the liquid container according to "24", wherein the container is formed as a vertically long rectangular solid by making a tubular form with one piece of paper-based laminated container material comprising a plastic layer on both sides, and closing by folding the both end parts; ("26") the liquid container according to "24" or "25", wherein the abutting surface of the lower end of the outer tube part (inner tube part side) with a large diameter located outside of the container with the container, is formed as an inclined surface which is inclined at a certain angle downward and backward against the surface bisecting at right angles with the axis of the pouring device body; ("27") the liquid container according to any one of "24" to "26", wherein the diameter of circular (perfect circle) opening part provided on the top wall of the liquid container is smaller by 1 - 3 mm than the maximum size (diameter) of the inner tube part with a small diameter of the pouring device, that can be inserted in the container.

Brief Description of Drawings

[0016] 

[Fig. 1] It is a side view showing the pouring device of the present invention having continuous flanged projections.

[Fig. 2] It is a front view showing the pouring device of the present invention having continuous flanged projections.

[Fig. 3] It is a flat view showing the pouring device of the present invention.

[Fig. 4] It is a cross sectional view AA of Fig. 2.

[Fig. 5] It is an explanation drawing showing the action of mounting the pouring device having continuous flanged projections to the container.

[Fig. 6] It is a back view showing the pouring device of the present invention having discontinuous flanged projections.

[Fig. 7] It is a back view showing another pouring device of the present invention having discontinuous flanged projections.

[Fig. 8] It is a side view showing another pouring device of the present invention having discontinuous flanged projections.

[Fig. 9] It is a front view showing another pouring device of the present invention having discontinuous flanged projections.

[Fig. 10] It is a side view showing the pouring device of the present invention having short projections.

[Fig. 11] It is a front view showing the pouring device of the present invention having short projections.

[Fig. 12] It is a cross sectional view AA of Fig. 11.

[Fig. 13] It is an explanation drawing showing the action of mounting the pouring device having short projections to the container.

[Fig. 14] It is a perspective view showing one example of the container to which a pouring device of the present invention is to be mounted.

Explanation of Numerals

[0017] 

1. pouring device

2. pouring device body

3. outer tube part

4. inner tube part

5. hinge

6. cap

7. container

21. supporting groove

22. discontinuous site

23. hole

24. tip end opening

31. supporting flange

32. abutting surface

33. pouring part

34. outward convex part

35. connecting flange

41. continuous flanged projection

42. groove forming surface

43. connection part

44. discontinuous flanged projection

45. screw type

46. screw piece

47. short projection

48. top surface (of short projection)

49. lower side periphery surface (of short projection)

51. first hinge

52. second hinge

53. thin hinge

61. top panel

62. periphery wall

63. inner wall

64. inward convex part

65. tab

71. top wall

72. back surface wall

73. left side wall

74. upper triangle ear-portion

75. upper transverse sealing part

76. vertical sealing part

77. opening part

78. periphery

79. cut fragment

Best Mode for Carrying Out the Present Invention

[0018] In the following explanation of the pouring device of the present invention, the front and back of the pouring device relate to left and right directions in Figs. 1, 8 and 10, and the up and down relate to upward and downward directions in Figs. 1 and 6. Further, the front and back of the cap relate to left and right directions in Figs. 4 and 12, when the cap is closing the pouring device (dashed line in Figs. 4 and 12). The up and down of the cap relate to upward and downward directions in Figs. 4 and 12, when the cap is closing the pouring device (dashed line in Figs. 4 and 12).

[0019] As a pouring device of the present invention, it is not particularly limited as long as it is a pouring device comprising a pouring device body and a cap which are molded integrally, wherein the pouring device body comprises an inner tube part (bottom side) with a small diameter that can be inserted in a container as the container is opened, and an outside tube part (upper side) with a large diameter, which is located outside of the container, and has a pour opening, wherein the inner tube part and outer tube part are fixed by being communicated each other; wherein the cap is connected via a hinge to the vicinity of the pour opening part of the outer tube part, enabling to close and reopen the pour opening; and wherein a hole is formed on the periphery of the upper side (outer tube part side) of the inner tube part so that liquid of the container can be poured to the last drop. However, a pouring device wherein the hole is formed on the periphery of the upper side of the inner tube part (outer tube part side) corresponding to the opposite position in the circumferential direction of the hinge connecting part of the outer tube part is preferred as the liquid in the container can be surely poured to the last drop.

[0020] As for the inner tube part forming the lower side part of the above-mentioned pouring device body, it can be a hollow tube having a column shape. However, it is preferred to be a tapered tube which outer diameter becomes slightly smaller toward the tip end, in order to facilitate the insertion into the container opening part. The taper angle of the inner tube part is preferred to be about 0.5 - 10 degree against its axis, more preferably about 0.5 - 5 degree, and most preferably about 0.5 - 3 degree. Further, the maximum outer diameter of the inner tube part is not particularly limited. However, it is preferred to be 8 - 11 mm. It is preferred that the outer diameter is larger than the diameter of the circular (perfect circle) opening part provided on the top wall of the liquid container by about 1 - 3 mm, particularly about 2 mm, so that the upper end of the inner tube part is tightly pinched with the container opening part when the pouring device is mounted, there is no space between the upper end of the inner tube part and the container opening part, and liquid leakage from the container opening part is prevented. Further, it is preferred that the tip end of the inner tube part has a tip end opening which is inclined downward in the forward direction against its axis, preferably inclined at 30 - 40 degree in a planar view. When a tip end opening which is inclined at 30 - 40 degree in a planar view is provided, the opening part of the container (so-called straw hole) to which the pouring device is to be mounted can be opened easily. When the tip end of the inner tube part is inclined downward and forward direction against its axis, when a hole is formed on the front periphery surface on the upper side of the inner tube part corresponding to the opposite position in the circumferential direction with the hinge connecting part of the outer tube part, most of the cut fragments of the opening part formed at the time of opening of the container are formed on the opposite side of the hole, and the cut fragments will not block the hole when pouring the content, which is preferred.

[0021] The outer tube part forming the upper side part of the pouring device body has a pour opening on the upper end. It is preferred that the diameter of the pour opening is 10 - 12 mm. The pour opening formed on the upper end is preferred to be formed as a short tubular pouring part. It is preferred to provide outward convex parts on the entire periphery of the outer periphery surface of the short tubular pouring part, as it is possible to maintain the closed state of the cap to be liquid-tight, by engaging the inward convex part of the cap, described in the following, with the outward convex part. Further, as for the outer tube part, it is preferred to form a flanged supporting flange on the lower end of the outer periphery part of the outer tube part, by enlarging the surface of the abutting part of the lower end of the outer tube part (inner tube part side) with the container, to keep the pouring part mounted to the container to be more stable. Further, it is preferred to form a flanged connecting flange for connecting hinges directly below the short tubular pouring part on the upper end of the outer tube part, in order to fix the closed cap more stable. Further, plural ribs can be provided perpendicularly at certain intervals between the connecting flange and supporting flange. Further, it is preferred to form the abutting surface of the lower end of the outer tube part with the container, to be an inclined surface which is inclined downward and backward against the surface bisecting at right angles with the axis of the pouring device body by a certain angle of θ degree, preferably 10 - 45 degree, more preferably 20 - 30 degree, particularly when it is a case with a flat top wall, as the outer tube part of the pouring device is mountedbeing inclined against the container top wall, pouring of the content, particularly when pouring to a glass, etc., can be performed easily by inclining slightly the container.

[0022]  Further, it is preferred to provide projections on the upper side of the outer periphery surface of the inner tube part corresponding to the opposite position in the circumferential direction of the hinge connecting part of the outer tube part, and at a level upper than the hole, so that the pouring device body is stable, by abutting from the inner surface side of the container to the wall surface of the container when opening the cap. Therefore, when the hole is formed on the upper side of the periphery of the inner tube part corresponding to the opposite position in the circumferential direction of the hinge connecting part of the outer tube part, it becomes a more preferred embodiment wherein at least a projection is provided on the outer periphery surface of the inner tube part upper than the hole. As for the height of the projections from the outer periphery surface of the inner tube part, 0.3 - 1.0 mm can be suitably exemplified. Particularly, when the abutting surface of the lower end of the outer tube part is formed as an inclined surface which is inclined at a certain angle of θ degree, the tip end of the inner tube part breaks through the opening part, and when the inner tube part is introduced perpendicularly in the container, the front and back direction of the openingpart is opened by (almost maximal outer diameter of the inner tube part + height of the projection) . However, when it abuts the lowest part (back part) of the abutting surface of the lower end of the outer tube part, the pouring device begins to incline its axis so that the abutting surface follows the top wall of the container, guides a part of the periphery of the opening part into the container. At last, the front and back direction of the opening part of the container is opened by (maximal outer diameter of the inner tube part/cos θ). For example, when the maximal outer diameter of the inner tube part is 10 mm, and the inclination angle θ is 25 degree, the front and back direction of the opening part of the container is pushed and expanded by about 11 mm. If the height of the projection is about 0.4 - 0.6 mm, the part which has been extra-opened with the projections will be absorbed, and there will be no liquid leakage from the opening part caused by the projections, at the time of pouring. It is preferred that the projection is provided at a distance of 4 - 5 mm from the abutting surface of the lower end of the outer tube part, and/or so that the lowest level of the abutting surface is located at a same level in the up and down direction with the upper end of the projection. When the distance form the abutting surface to the upper end of the projection is too short, the damage caused by the projection on the periphery of the opening part may be increased, or the periphery of the opening part may not cross over the projection, thus causing liquid leakage. Moreover, if the distance is too long, it is difficult to keep the pouring device body stable.

[0023] Further, as a form of a projection provided on the outer periphery surface of the upper side of the inner tube part corresponding to the opposite position in the circumferential direction of the hinge connecting part of the outer tube part, and upper than the hole, preferably at least on the outer periphery surface of the inner tube part upper than the hole, examples specifically include continuous flanged projections on the entire periphery of the inner tube part, discontinuous flanged projections on the periphery of the inner tube part, short projections having a width in the circumferential direction which is narrower than that of the hole. It is preferred that a projection of any shape, is formed by being tapered so that the diameter of the side periphery surface or lower part of the projection decreases in the downward direction, so that the inner tube part with projection can be smoothly introduced into the opening part of the container.

[0024] When the projections are formed as continuous flanged projections on the entire periphery of the inner tube part, it is preferred that the continuous flanged projections are formed being parallel with the abutting surface at the lower end of the outer tube part, or so that the distance to the abutting surface is enlarged to the forward direction. It is more preferred that the lower end part of the flanged projection located on the most upper level is located at an upper level of the upper end part of the flanged projection located on the lowest level, so that when inserting the inner tube part, the periphery surface on the side of the flanged projection which is located on the most upper level and the periphery surface on the side of the flanged projection which is located on the lowest level do not abut the periphery of the opening part at the same time, and that the opening surface of the periphery of the opening part which is pushed and expanded is minimized. When it is formed as a continuous flanged projection, the upper end surface of the flanged projection opposing to the abutting surface of the outer tube part, becomes a groove-forming surface forming a supporting groove by cooperating with the abutting surface. The supporting groove being formed, the accuracy of positioning the pouring device to the container is enhanced, the oscillation of the pouring device decreases, and thus leakage of the content frombetween the supporting groove and the opening part of the container can be prevented.

[0025] Further, when the groove-forming surface formed as continuous flanged projection on the entire periphery of the inner tube part, and the abutting surface of the lower end of the outer tube part are almost parallel, the distance between the groove-forming surface and the abutting surface being provided to be almost parallel, that is the width of the supporting groove, is preferred to be slightly longer than the thickness of the container packing material. Further, the peripheral surface of the flanged projection is preferred to be a reversed-truncated circular cone, so that the lower end stands from the inner tube part without bump, and becomes a tapered surface, so that the insertion becomes easy, and to be a guide surface. Further, when the flanged projection which is located at the lowest level is located at a level lower than the upper end of the hole, when inserting the inner tube part (straw), from when the lower part of the flanged projection which is located at the lowest level abuts the periphery of the opening part, to when the upper end of the flanged projection is completely inserted, it is guided by the periphery surface of the flanged projection and moved transversely, a part corresponding to the height of the flanged projection is absorbed by the hole, only a part corresponding to the diameter of the inner tube part is pushed and expanded, thus the opening surface of the periphery of the opening part which is pushed and expanded can be minimized. As a result, the accuracy of positioning the pouring device to the container by the flanged projection is enhanced, and thus leakage of the content from between the supporting groove and the opening part of the container can be prevented. When pouring the content liquid from a container to which this type of pouring device with continuous flanged projections is mounted, the content liquid can be poured to a glass, etc. without pulsating, flashing, or dripping, by inclining the container and pressing lightly the side surface of the container with fingers.

[0026] As discontinuous flanged projections on the periphery surface of the inner tube part, the followings can be exemplified: discontinuous flanged projections in which a part of the continuous flanged projection of the entire periphery of the inner tube part is deleted, except for the outer periphery surface on the upper side of the inner tube part corresponding to the opposite position in the circumferential direction of the hinge connecting part of the outer tube part (deletion subtype); or discontinuous flanged projections wherein projections are formed in screw-type at discontinuous sites, in other words, wherein one end of the projection is formed in a helical form in the lower part (screw-type subtype). When using a pouring device having discontinuous projections of screw-type subtype, when mounting the pouring device to the container, the pouring device can be inserted through just like screwing in. Thus, the positioning accuracy to the container can be enhanced. Further, by fixing plural screw pieces having a wedge shape on the upper surface of discontinuous flanged projections of screw-type subtype, the wall surface of the container can be pinched between the abutting surface on the lower end of the outer tube part and the screw pieces when screwing the pouring device to the container, and the pouring device can be fixed securely to the container. Thus the positioning accuracy to the container can be further enhanced. Moreover, when applying these discontinuous flanged projections, almost the same effect as when applying continuous flanged projections on the entire periphery of the inner tube part, can be obtained.

[0027] Next, when the projection is formed as a short projection having a width in the circumferential direction which is narrower than the width in the circumferential direction of the hole, for example 3 - 5 mm, the opening surface of the container opening part becomes small when inserting the inner tube part perpendicularly into the container, and liquid leakage from the container opening part can be prevented when pouring. Particularly, by making the maximal diameter of the inner tube part to be larger than the diameter of the circular (perfect circle) opening part by 1 - 3 mm, particularly about 2 mm, when the pouring device is mounted, the upper end of the inner tube part is tightly pinched to the container opening part, so that there is no space between the upper end of the inner tube part and the container opening part, thus preventing liquid leakage from the container opening part when pouring, as well as enabling to maintain the pouring device stable. When pouring the content liquid from the container to which the short projection-type pouring device is mounted, the content liquid can be poured to a glass, etc. without pulsating, flashing, or dripping, by inclining the container and pressing lightly the side surface of the container with fingers.

[0028] As for a cap that is attached openably/closably via a hinge to the vicinity of the pouring opening part of the outer tube part, more specifically to a flanged connecting flange for connecting hinges which is provided directly below the short tubular pouring part on the upper end of the outer tube part, and that can close/reopen the pour opening, a cap comprising a disk-shaped top panel, a short tubular peripheral wall being dropped from the periphery of the top panel, and a short tubular inner wall being dropped from the top panel in the inner side of the peripheral wall, can be suitably exemplified. Further, it is preferred to be a cap to which inward convex parts are provided on the lower end of the inner periphery surface, almost on the entire periphery of the inner periphery surface; or a cap to which outward flanged tabs are provided for a certain length of the outer periphery surface, on the front lower end of the outer periphery surface of the periphery wall. The inward convex part of the cap can maintain the closed state of the cap by being engaged with the outward convex part of the pouring part, as it is mentioned in the above. Further, it is preferred to be constituted so that the outer surface of the lower end part on the inner wall is tightely fit to the inner surface of the upper end part of the pouring part when the cap is in a closed state.

[0029] As for the above hinge, it is not particularly limited as long as it can connect the cap and the vicinity of the pour opening part of the outer tube part, so that the cap can close/reopen the pour opening of the outer tube part. It is preferred that the cap comprises a first hinge and a second hinge that connect the cap and the flanged connecting flange for connecting hinges of the outer tube part, wherein the first hinge connects the backward of the upper end of the outer tube part and the backward of the lower end of the cap, and is formed as a matched pair of hinges having a thin hinge at the central part in the front-back direction, and wherein the second hinge is provided as a pair of opposing v-shapes between the pair of fist hinges. The cap opens and closes by using the above pair of first hinges as a supporting point. It is preferred that the second hinge is connected to the connecting flange of the outer tube part and to the cap at a lower level of the thin hinge. The first hinge is bend and prolonged with the thin hinge located at the center of the connecting flange of the outer tube part which is being opened, and the cap. The second hinge is bent and prolonged at the connecting part of the outer tube part and the cap. By using a hinge such constituted, the cap can maintain a closed state or an opened state against the outer tube part, and for example the cap will not be disturbing when pouring the content liquid by using the pouring device.

[0030] The material of the pouring device of the present invention which is molded integrally by injection molding, compression molding, blow molding, injection blow molding, rotational molding, vacuum molding, pressure molding, vacuum-pressure molding, is not particularly limited. Usually, plastics having polyolefin resins including polypropylene and polyethylene, or polystyrene resins as raw materials, can be exemplified.

[0031] As for containers to which the pouring device of the present invention can be applied, so-called brick containers which are molded continuously from a band-shaped packing material can be suitably exemplified. Further, gable top containers molded from tubular cartons (there are also flat top containers) can be used regardless of the container shape . Examples of container material include material having a three-layer structure such as paper-based laminated container material comprising a plastic layer on both sides, optionally including aluminum foil. Instead of the aluminum foil, barrier layer made of synthetic resins can be used. The opening part to which the pouring device is attached, are formed by removing the paper layer by leaving only the plastic layers of the container material, or by removing only the paper layer by leaving the aluminum foil or barrier layer made of synthetic resins, or to put a half-cut along the periphery of the opening part. The shape of the opening part may be a deformed oval, or ellipse as well as circular (perfect circle) , depending on the structure of the inner tube part. When it is a container with a flat top wall, such as a brick container, a pouring device wherein the abutting surface of the lower end of the outer tube part (inner tube side) with the container is formed as an inclined surface inclined at a certain angle against the surface bisecting at right angles with axis of the pouring device body, can be suitably used.

[0032] A liquid container of the present invention is not particularly limited as long as it is a container having a circular (perfect circle) or oval opening part to which a pouring device of the present invention mentioned above is attached, and in which liquid beverages such as milk and juice, liquid seasoning such as seasoning soy sauce, fluid foods are tightly sealed and packed. Among them, a container formed in a rectangular solid form, by making a tubular form from a sheet of paper-based laminated container material comprising a plastic layer on both sides, and by folding both end parts of the formed tubular form, can be suitably exemplified. When it is a container with a flat top wall, such as a brick container, it is preferred to be a pouring device wherein the abutting surface with the container at a lower end of the outer tube part, is formed as an inclined surface inclined downward and backward with a certain angle against the surface bisecting at right angles with the axis of the pouring device body. Further, it is more preferred that the diameter of the circular (perfect circle) opening part provided on the top wall of the container is 1-3 mm smaller than the maximum outer size (diameter) of the inner tube part with a smaller diameter, that can be inserted in the container with the opening part.

Examples

[0033] The pouring device according to the present invention will be explained by referring to Figs. 1 to 14. In Figs. 1 to 5, embodiments of a pouring device to which continuous flanged projections are formed on the entire periphery of the inner tube part (herein after referred to as "type I pouring device") are shown. In Figs. 6-9, and Fig. 3, embodiments of a pouring device to which discontinuous flanged projections are formed on the periphery of the inner tube part (hereinafter referred to as "type II pouring device"), and in Figs. 10-13, and Fig. 3, embodiments of a pouring device to which short projections having a width in the circumferential direction which is narrower than that of the hole of the inner tube part (hereinafter referred to as "type III pouring device"), are shown.

[Common parts of type I pouring device, type II pouring device, and type III pouring device]

[0034] Fig. 14 shows a sealed container 7 to which a pouring device 1 of the present invention is to be attached. Container 7 is formed in a rectangular solid form, by making a tubular form from a sheet of paper-based laminated container material comprising plastic layers on both sides, and by folding and closing both end parts of the formed tubular form, and comprises top wall 71, front wall (not shown in the Figure), back wall 72, left side wall 73, right side wall (not shown in the Figure), and bottom wall (not shown in the Figure) . On the left end of top wall 71 and upper end of left side wall 73 are provided with upper triangle ear-portions 74, which are fixed by being piled up on the left side wall 73. On the right side of top wall 71, and upper end of right side wall, upper triangle ear-portions (not shown) are provided which are fixed on the right side wall. On both sides of bottom wall and bottom end of left and right side walls, a pair of bottom triangle ear-portions (not shown) is provided. The bottom triangle ear-portions are fixed on the bottom wall. Upper transverse seal part 75 is formed, extending from the tip end of one of upper triangle ear-portion 74 by cutting longitudinally on the top wall 71, extending to the tip end of the other upper triangle ear-portion. This was generated when closing the upper end of the tubular container material. When closing the lower end of the tubular container material, bottom transverse seal part (not shown) is formed, which cuts longitudinally on the bottom wall extending from one of the bottom triangle ear-portion, and extending to the tip end of the other bottom triangle ear-portion. Longitudinal seal part 76 is extended from the middle part of the length of the upper transverse seal part 75 by cutting longitudinally on the back surface wall 72 to the middle part of the length of the bottom transverse seal part. This is generatedwhen forming the container material into a tubular form. In the region subdivided by the upper transverse seal part 75 and longitudinal seal part 76 on the top wall 71, circular (perfect circle) or oval opening part (attaching part) 77 is formed.

[0035] As the outline is shown in Figs. 5 and 13, the opening part 77 is formed by removing the paper layer, by leaving only the plastic layer of the container material. As for container materials, commonly known packing materials for manufacturing container with straw are generally used. In some cases, the commonly known shape of the straw fixing hole (perfect circle) of a packing material for manufacturing a container with straw can be used directly, or by changing it slightly to an oval form, to make the opening part 77. The pouring device 1 of the present invention is fixed and attached to the back surface wall 72, by being put in a thin plastic bag (not shown).

[0036] As it is shown in Figs. 1-13, the pouring device 1 of the present invention is obtained by molding integrally a synthetic resin material such as polypropylene by injection molding. The pouring device comprises a tubular pouring device body 2, wherein an inner tube part 4 which is inserted into the container when opening the container is formed on the lower side, and an outer tube part 3 located on the outside of the container is formed on the upper side; and a cap 6 that can close the upper end opening of the pouring device body.

[0037] The outer tube part 3 comprises a short tubular pouring part 33 forming an pouring opening on the upper end, a flanged connecting flange 35 for connecting hinges directly below the short tubular pouring part 33, and a tubular body with an inner diameter of 11 mm comprising an abutting surface 32 inclined downward and backward at 25 degree against the surface bisecting at right angles with its axis. On the bottom outer periphery part of the outer tube part 3, a flanged supporting flange 31 is formed. The bottom surface of the supporting flange 31 is also formed as an abutting surface 32 which abuts the top wall 71 of the tightly-sealed container 7, when attaching the pouring device 1 to the tightly-sealed container 7. Outward convex parts 34 are provided all around the outer periphery surface of the pouring part 33.

[0038] The cap 6 comprises a disk-shaped top panel 61, a short tubular peripheral wall 62 provided being dropped from the periphery of the top panel 61, a short tubular inner wall 63 provided being dropped from the top panel 61 in the inner side of the periphery wall. On the lower end of the inner periphery surface of the periphery wall 62, inward convex parts 64 are provided almost on the entire inner periphery surface. On the frontward of the lower end of the outer periphery surface of the periphery wall 62, outward flanged tabs 65 are provided for a certain length of the outer periphery surface. The cap 6 is connected to the outer tube part 3, being openably and closably by the hinge 5. The inward convex part 64 of the cap 6 can maintain the cap in a closed state by being engaged with the outward convex parts 34 of the pouring part 33. When the cap 6 is in a closed state, the outer surface of the lower end part of the inner wall 63 is tightly fixed to the inner surface of the upper end part of the pouring part 33, and the lower end surface of the cap 6 is made to abut with the upper surface of the connecting flange 35 of the outer tube part 3.

[0039] The hinge 5 comprises a first hinge 51 and a second hinge 52, which connect the flanged connecting flange 35 for connecting hinges of the outer tube part 3 and the cap 6. The first hinge 51 connects the backward of the upper end part of the outer tube part 3 and the backward of the lower end part of the cap 6, and is formed as a matched pair of hinges having a thin hinge 53 at the central part in the front-back direction. The cap 6 opens and closes by using a pair of thin hinge 53 as a supporting point. The second hinge 52 is provided as a pair of opposing V-shapes between a pair of the first hinges 51, in a planar view (see Fig. 3). The second hinge 52 is connected to the outer tube part 3 and the cap 6 at a lower level of the thin hinge 53, in a planar view (see Figs. 1, 8, and 10) . The first hinge 51 is bent and prolonged with the thin hinge 53 located at the center part of the opened outer tube part 3 and the cap 6, and the second hinge is bent and elongated at the connecting part of the outer tube part 3 and the cap 6. As the hinge 5 is constituted as in the above, the cap 6 can maintain the closed or opened state against the outer tube part 3, and for example, when pouring the content liquid by using the pouring device 1, the cap 6 will not be disturbing.

[0040] The inner tube part 4 comprises a tapered tubular body which outer diameter becomes slightly smaller towards the tip end. The inner diameter of the tip end is formed to be 7 mm. The tapering angle of the inner tube part 4 is about 1 degree against its axis. The tip end of the inner tube part 4 has a tip opening 24 inclined downward and frontward at 35 degree in a planar view against the axis. Further, on the periphery of the upper side (outer tube side) of the inner tube part 4 corresponding to the opposite position in the circumferential direction of the hinge connecting part of the outer tube part 3, a hole 23 is provided for pouring the liquid of the container to the last.

[0041] When opening the container 7, the pouring device 1 is removed from the container 7 together with the bag (not shown) and the pouring device 1 is taken out from the bag by tearing off the bag. Then, the pouring device 1 is inserted to the opening part 77 by following the procedures manual of Figs. 5 and 13. By inclining the container 7, and by pressing lightly with fingers the side surface of the container 7, the content runs off through the pouring opening of the pouring device 1. When the content becomes a small amount, the content runs off through the hole 23. When the container 1 is to be reclosed with the content inside, the cap 6 is to be covered on the pouring opening of the outer tube part 3.

[Pouring device Type I]

[0042] On the upper periphery of the inner tube part 4, flanged projections 41 of a height of 0.5 mm are provided being parallel with the supporting flange 31. The upper end surface of the flanged projection 41 opposing with the abutting surface 32 of the outer tube part 3, becomes a groove-forming surface 42 that forms a supporting groove 21 by cooperating with the abutting surface 32. The groove forming surface 42 is formed by being inclined downward and backward at 25 degree against the axis of the inner tube part 4. The side peripheral surface of the flanged projection 41 is formed by being tapered so that the diameter becomes smaller toward the bottom direction, and is connected with the outer periphery surface of the inner tube part 4 at the connecting part 43 at its lower end. The most upper part (front part) of the connecting part 43 is located at a level upper than the most bottom part (back part) of the groove forming surface 42. Directly below the flanged projection 41 of the inner tube part 4, a hole 23 with a long hole shape is provided. The hole 23 is provided in the circumferential position (front direction) of the inner tube part 4 which flanged projection 41 is provided on the most upper level. The upper end of the hole 23 is located at a level upper than the lowest level of the groove forming surface 42 (back part), and the bottom end is located at a level lower than the lowest level part (back part) of the groove forming surface 42. By making the abutting surface 32 and the groove forming surface 42 as a side wall, with the circular supporting groove 21 wherein the outer periphery surface of the inner tube part is used as a bottom part, the pouring device 1 can be tightly fixed to the container. The part just above the hole 23 of the flanged projection 41 abuts the top wall 71 of the container 7 from the inner surface side of the container when opening the cap 6, and has an effect to lock the pouring device body 2, so that the pouring device is stable.

[0043] Next by referring to Fig. 5, the action for mounting the pouring device 1 to the container 7 is explained. The pouring device 1 is approached to the container while the axis is perpendicular with the surface of the opening part 77. Next, the tip end of the inner tube part 4 breaks through the opening part 77, and the inner tube part 4 is inserted into the container 7. The inner tube part 4 is inserted into the container 7 being almost perpendicular with the surface of the opening part 77 along the axis direction (see Fig. 5 (a)). When the insertion proceeds, from a part of the periphery 78 of the opening part 77, the flanged projection 41 begins to go over the lowest level (back part) . Then the top wall 71 of the container 7 abuts the lowest level part (back part) of the abutting surface 32 which is formed on the lower surface of the supporting flange 31, the axis of the pouring device 1 begins to be inclined so that the abutting surface 32 goes along the top wall 71 of the container 7, and guides a part of the periphery 78 of the opening part 77 in the supporting groove 21 (see Fig. 5 (b) ) . At that time, cut fragments 79 of the opening part 77 are formed in the container 7, but as it is stated in the above, the tip end of the inner tube part 4 is inclined downward and frontward at 35 degree against the axis in a planar view, most of the fragments are formed on the opposite side of the hole 23, and the cut fragments 79 do not block the hole 23. After a part of the periphery of the opening part 77 goes deep into the supporting groove 21, and the remaining periphery 78 of the opening part 77 goes over the flangedprojection 41, and the periphery 78 is engaged completely into the supporting groove 21 (see Fig. 5 (c)). When pouring the content liquid from the container mounted with this pouring device type I, the content liquid can be poured to a glass, etc. without pulsating, flashing, or dripping, by inclining the container and pressing lightly the side surface of the container with fingers.

[Pouring Device Type II]

[0044] Fig. 6 shows a pouring device (deletion subtype) wherein discontinuous flanged projection 44 with a height of 0.5 mm are provided on the periphery of the upper part of the inner tube part 4, parallel with the supporting flange 31, comprising discontinuous part (deleted part) 22. Discontinuous part 22 is provided to transverse diagonally discontinuous flanged projection 44. Further, Figs. 7 to 9 show a pouring device (screw-type subtype) wherein discontinuous flanged projection 44 formed in a screw-type 45 at discontinuous site 22, is provided on the upper periphery of the inner tube part 4. At 3 sites on the upper surface of discontinuous flanged projection 44 of this screw-type subtype, screw pieces 46 having a wedge shape are fixed. Pouring device type II (deletion subtype and screw-type subtype) can be fixed securely to the container by inserting the pouring device by screwing when mounting the pouring device to the container. Thus, the positioning accuracy to the container can be further enhanced. Plural discontinuous sites 22 can be provided on discontinuous flanged projection 44, while it is preferred that at least 1 discontinuous site 22 is provided where the flanged projection 44 is at the lowest level, so that it can be screwed certainly.

[Pouring Device Type III]

[0045] Directly above the hole 23 with a long hole shape formed on the inner tube part 4, a planar view of a width of 4 mm in the circumferential direction in a planar view, and a height of 0.5 mm is provided on the short projection 47 with a trapezium shape in longitudinal section. The peripheral surface 49 of the lower side of the short projection 47 is formed being tapered so that the diameter becomes smaller towards the downward direction, and is connected with the outer peripheral surface of the inner tube part 4 at the connecting part 43 at the lower end. The top surface 48 of the short projection 47 is formed as a peripheral surface parallel with the axis of the inner tube part 4, and the top surface 48 is located at the same height as the lowest level of the abutting surface 32 which is formed on the lower surface of the supporting flange 31. The short projection 47 abuts the top wall 71 of the container 7 from the inner surface side of the container when opening the cap 6, and has an effect to lock the pouring device body 2, so that the pouring device is stable.

[0046] Next, by referring to Fig. 13, the action of mounting the pouring device 1 to the container 7 is explained. The pouring device 1 is approaching the container while the axis is perpendicular with the surface of the opening part 77 (see Fig. 13 (a) ) . Next, the tip end of the inner tube part 4 breaks through the opening part 77, and the inner tube part 4 is inserted into the container 7. The inner tube part 4 is inserted into the container 7 being almost perpendicular with the surface of the opening part 77 along the axis direction. When the insertion proceeds, from a part of the periphery 78 of the opening part 77, the lower part of the periphery surface 49 of the short projection 47 begins to go over. Then the top wall 71 of the container 7 abuts the lowest level part (backpart) of the abutting surface 32 which is formed on the bottom surface of the supporting flange 31, the axis of the pouring device 1 begins to incline so that the abutting surface 32 goes along the top wall 71 of the container 7, and guides a part of the periphery 78 of the opening part 77 into the container. At that time, cut fragments 79 of the opening part 77 are formed in the container 7, but as it is stated in the above, the tip end of the inner tube part 4 is inclined downward and frontward at 35 degree in a planar view, most of the fragments are formed on the opposite side of the hole 23, and the cut fragments 79 do not block the hole 23. After a part of the periphery of the opening part 77 goes deep into the container, and the remaining periphery 78 of the opening part 77 goes over the short projection 47, and the periphery 78 is engaged completely into the container (see Fig. 13 (b) ) . When pouring the content liquid from the container mounted with this pouring device type III, the content liquid can be poured to a glass, etc. without pulsating, flashing, or dripping, by inclining the container and pressing lightly the side surface of the container with fingers.

[0047] In the above explanation, the hole 23 is provided on the frontward of the inner tube part 4. However, the hole 23 can be provided on the side of the inner tube part 4, or on the backward. Particularly with the [pouring device type III], it is necessary to provide a certain distance between the short projection 47 and the abutting surface 32, and if the hole 23 is provided frontward of the inner tube part 4, there will be a distance between the top wall 71 of the container 7 and the hole 23. In such cases, by providing the hole 23 on the side or backward of the inner tube part 4 to make the distance smaller, the content can be surely poured to the last drop. Further, in such cases, it is preferred that the tip end of the inner tube part 4 is inclined toward the side or back, and downward.

Industrial Applicability

[0048] According to the present invention, it is possible to enhance the positioning accuracy of the pouring device to the container, so that the pouring device is stable, and to prevent the content to leak from between the pouring device and the container opening part. Further, according to the present invention, as the pouring device body and the cap are formed by integral molding, it is possible to confer resealability easily to the pouring device.

Claims

1. A pouring device comprising a pouring device body and a cap which are molded integrally,
wherein the pouring device body comprises an inner tube part (lower side) with a small diameter that can be inserted in a container as the container is opened, and an outside tube part (upper side) with a large diameter, which is located outside of the container and has a pour opening;
wherein the cap is connected via a hinge to the vicinity of the pour opening of the outer tube part, and can close and reopen the pour opening;
wherein a hole is formed on the upper side of the periphery (outer tube part side) of the inner tube part so that liquid of the container can be poured to the last drop.

2. The pouring device according to claim 1, wherein the hole is formed on the upper side of the periphery (outer tube part side) of the inner tube part, corresponding to the opposite position in the circumferential direction of the hinge connecting part of the outer tube part.

3. The pouring device according to claim 1 or 2, wherein the inner tube part is tapered so that the outer diameter becomes smaller toward the tip end.

4. The pouring device according to claim 3, wherein the taper angle is 0.5 - 5 degree.

5. The pouring device according to any one of claims 1 to 4, wherein the inner tube part has a maximum diameter of 8 - 11 mm.

6. The pouring device according to any one of claims 1 to 5, wherein the tip end of the inner tube part has a tip end opening inclined downward and forward against its axis.

7. The pouring device according to claim 6, wherein the tip end of the inner tube part has a tip end opening inclined downward and forward at 30 - 40 degree in a planar view against the surface bisecting at right angles with its axis.

8. The pouring device according to any one of claims 1 to 7, wherein a flanged supporting flange is formed on the outer periphery part of the lower end of the outer tube part.

9. The pouring device according to any one of claims 1 to 8, wherein a flanged flange for connecting hinges is formed on the outer periphery part of the upper part of the outer tube part.

10. The pouring device according to any one of claims 1 to 9, wherein the abutting surface of the lower end of the outer tube part (inner tube part side) with the container is formed as an inclined surface inclined at a certain angle downward and backward against the surface bisecting at right angles with the axis of the pouring device body.

11. The pouring device according to claim 10, wherein the abutting surface is inclined at 20 - 30 degree against the surface bisecting at right angles with the axis of the pouring device body.

12. The pouring device according to any one of claims 1 to 11, wherein projections are provided at least on the outer periphery part on the upper side of the inner tube side, corresponding to the opposite position in the circumferential direction with the hinge connecting part of the outer tube part, and at a position upper than the hole when opening the cap.

13. The pouring device according to claim 12, wherein a projection with a height of 0.4 - 0.6 mm are provided.

14. The pouring device according to any one of claims 1 to 13, wherein a projection is provided so that the upper end of the projection is located 4 - 5 mm from the abutting surface at the lower end of the outer tube part.

15. The pouring device according to any one of claims 1 to 14, wherein a projection is formed as a flangedprojection continuing on the entire periphery of the inner tube part.

16. The pouring device according to claim 15, wherein the continuous flanged projection are formed to be parallel with the abutting surface of the lower end of the outer tube part, or so that the distance with the abutting surface increases in the forward direction.

17. The pouring device according to claim 15 or 16, wherein the continuous flanged projection are formed so that the lower end part of the flanged projection located on the most upper level is located upper than the upper end part of the flanged projection located on the lowest level.

18. The pouring device according to any one of claims 1 to 14, wherein the projection is formed as a discontinuous flanged projection on the periphery of the inner tube part.

19. The pouring device according to claim 18, wherein the discontinuous flanged projection is formed as a screw-type at a discontinuous site.

20. The pouring device according to any one of claims 1 to 14, wherein the projection is formed as a short projection having a width in the circumferential direction that is narrower than that of the hole.

21. The pouring device according to claim 20, wherein the short projection has a width in the circumferential direction of 3-5 mm, which is narrower than that of the hole.

22. The pouring device according to any one of claims 1 to 21, wherein the hinge connecting the outer tube part and the cap comprises a first hinge and a second hinge, the first hinge connecting the backward of the upper end part of the outer tube part and the backward of the lower end part of the cap, and being formed as a matched pair of hinges having a thin hinge at the central part in the front-back direction, the second hinge being provided between the pair of the first hinges, as a pair of opposing V-shapes.

23. The pouring device according to any one of claims 1 to 22, being formed integrally by injection molding.

24. A liquid container having a circular or oval opening part to which the pouring device according to any one of claims 1 to 23 is attached.

25. The liquid container according to claim 24, wherein the container is formed as a vertically long rectangular solid by making a tubular form with one piece of paper-based laminated container material comprising a plastic layer on both sides, and closing by folding the both end parts.

26. The liquid container according to claim 24 or 25, wherein the abutting surface of the lower end of the outer tube part (inner tube part side) with a large diameter located outside of the container of the pouring device with the container, is formed as an inclined surface inclined at a certain angle downward and backward against the surface bisecting at right angles with the axis of the pouring device body.

27. The liquid container according to any one of claims 24 to 26, wherein the diameter of circular (perfect circle) opening part provided on the top wall of the liquid container is smaller by 1 - 3 mm than the maximum size (diameter) of the inner tube part with a small diameter of the pouring device, that can be inserted in the container of the pouring device.

Drawing