Drinking Vessel Having a Drinking Valve

Abstract

A drinking vessel comprising a drinking container comprising an interior, a drinking attachment comprising a bottom wall and a drinking element, which protrudes upwards from the bottom wall and which has at least one drinking opening on the outer end, which is connected to the interior via a passage channel, which extends through the drinking element, holding devices for releasably holding the drinking attachment on the drinking container, a drinking valve arranged in the passage channel, which closes when ambient pressure is present at the drinking opening, and which opens when a suction underpressure is present at the drinking opening, characterized in that the drinking valve comprises a tube, which is open on the top and closed on the bottom, which, in a wall, has at least one flow-through opening, which connects the inside of the tube to the outside of the tube, wherein the wall of the tube, at least in the area of the flow-through opening, is formed as a soft elastic diaphragm, and when ambient pressure is present at the drinking opening, the tube abuts with the outer rim of the flow-through opening on the wall of the passage channel so as to form a seal and, when a suction underpressure is present at the drinking opening, the diaphragm bulges inwards, so that the outer rim of the flow-through opening moves away from the wall of the passage channel.

Claims

1-34. (canceled)

35. A drinking vessel comprising: a drinking container comprising an interior, a drinking attachment comprising a bottom wall and a drinking element, which protrudes upwards from the bottom wall and which has at least one drinking opening on the outer end, which is connected to the interior via a passage channel, which extends through the drinking element, holding devices for releasably holding the drinking attachment on the drinking container, a drinking valve arranged in the passage channel, which closes when ambient pressure is present at the drinking opening, and which opens when a suction underpressure is present at the drinking opening, wherein the drinking valve comprises a tube, which is open on the top and closed on the bottom, which, in a wall, has at least one flow-through opening, which connects the inside of the tube to the outside of the tube, wherein the wall of the tube, at least in the area of the flow-through opening, is formed as a soft elastic diaphragm, and when ambient pressure is present at the drinking opening, the tube abuts with the outer rim of the flow-through opening on the wall of the passage channel so as to form a seal and, when a suction underpressure is present at the drinking opening, the diaphragm bulges inwards, so that the outer rim of the flow-through opening moves away from the wall of the passage channel.

36. The drinking vessel according to claim 35, wherein the flow-through opening extends across the side wall of the tube.

37. The drinking vessel according to claim 35, wherein the tube has a depression in the outside of a wall and the diaphragm is the bottom of the depression.

38. The drinking vessel according to claim 37, wherein the depression is arranged in the side wall of the tube.

39. The drinking vessel according to claim 35, wherein a sealing element, which circulates around the flow-through opening and which abuts the wall of the passage channel so as to form a seal, when ambient pressure is present at the drinking opening, protrudes to the outside from the outside of the diaphragm.

40. The drinking vessel according to claim 35, wherein a base protrudes to the outside from the outside of the diaphragm, through which the flow-through opening extends, wherein the base abuts the wall of the passage channel so as to form a seal with the outer rim of the flow-through opening, when ambient pressure is present at the drinking opening, and lifts off the wall of the passage channel, when a suction underpressure is present at the drinking opening.

41. The drinking vessel according to claim 40, wherein the sealing element protrudes from the outside of the base.

42. The drinking vessel according to claim 41, wherein the base is a massive, elongated element oriented in longitudinal direction of the tube, comprising a rectangular cross section.

43. The drinking vessel according to claim 35, wherein the tube has at least one continued flow channel on the outside, which extends from the diaphragm to the lower end of the tube.

44. The drinking vessel according to claim 35, wherein the tube is made of a soft elastic material in one piece.

45. The drinking vessel according to claim 35, wherein the drinking element is a drinking straw, which is connected to the tube on the lower end, and the tube is clamped into a suction tube, which protrudes into the drinking container from the underside of the bottom wall, wherein the outer rim of the flow-through opening abuts the wall of the suction tube so as to form a seal, when ambient pressure is present at the drinking opening, and lifts off the wall of the suction tube, when suction underpressure is present at the drinking opening.

46. The drinking vessel according to claim 45, wherein the tube is connected to the drinking straw in one piece.

47. The drinking vessel according to claim 45, wherein the tube has an edge, which protrudes outwards, at a distance from its lower end, and up to which the suction tube is pushed onto the tube.

48. The drinking vessel according to claim 35, wherein, above the diaphragm, the tube has at least one circumferential sealing element on the outside, which abuts the wall of the suction tube so as to form a seal

49. The drinking vessel according to claim 35, wherein the drinking straw is guided through the bottom wall of the drinking attachment so as to form a seal.

50. The drinking vessel according to claim 49, wherein the drinking straw has a circumferential flange on the outside, which abuts a sealing surface on one side of the bottom wall so as to form a seal.

51. The drinking vessel according to claim 50, wherein the flange is conical and abuts a conical sealing surface of the bottom wall so as to form a seal, which has a passage hole, through which the drinking straw is guided.

52. The drinking vessel according to claim 51, wherein the flange is soft elastic and the sealing surface of the bottom wall has a venting hole, which extends from the outside to the inside of the bottom wall, wherein the flange abuts the sealing surface so as to form a seal, when ambient pressure prevails in the interior, and the flange lifts off the sealing surface, when a suction underpressure is present in the interior.

53. The drinking vessel according to claim 35, wherein the drinking straw is embodied in one piece with the drinking attachment.

54. The drinking vessel according to claim 35, wherein the drinking element is a mouthpiece, which is cylindrical or which tapers to the outer end, and the tube is arranged in a cavity of the mouthpiece, wherein the outer rim of the flow-through opening abuts a wall of the mouthpiece so as to form a seal, when ambient pressure is present at the drinking opening, and the outer rim of the flow-through opening lifts off the wall of the mouthpiece, when a suction underpressure is present at the drinking opening.

55. The drinking vessel according to claim 54, wherein the mouthpiece has a hollow cylindrical holder on the inside, into which the tube is inserted.

56. The drinking vessel according to claim 55, wherein, on the lower rim, the tube has a valve flange, which abuts the lower rim of the holder, wherein the lower rim of the holder and/or the upper side of the valve flange has one or a plurality of continued flow channels, which extend in radial direction.

57. The drinking vessel according to claim 56, wherein the tube has a circumferential collecting channel above the valve flange and below the passage opening.

58. The drinking vessel according to claim 54, wherein the tube a second depression in the outside of a wall, the bottom of the second depression is a second diaphragm, the tube has at least one continued flow channel on the outside, which extends from the second depression to the lower end of the tube, and the tube has a further continued flow channel on the outside, which connects the second depression to the depression.

59. The drinking vessel according to claim 58, wherein the second depression is arranged diametrically opposite the depression in the side wall of the tube.

60. The drinking vessel according to claim 54, wherein the tube has a circumferential flange on the lower end, which abuts a sealing surface on the inside of the bottom wall so as to form a seal, the bottom wall has a venting hole, which extends from the outside to the inside of the bottom wall, wherein the flange abuts the sealing surface so as to form a seal, when ambient prevails in the interior, and the flange lifts off the sealing surface, when a suction underpressure is present in the interior.

61. The drinking vessel according to claim 60, wherein the flange is conical and abuts a conical sealing surface on the inside of the bottom wall so as to form a seal.

62. The drinking vessel according to claim 60, wherein the sealing surface is arranged on the lower end of the holder.

63. The drinking vessel according to claim 60, wherein the drinking attachment has a second passage channel, which extends from the outside of the bottom wall to the inside of the bottom wall, in which a venting valve is arranged, which opens, when a suction underpressure is present in the interior and which is closed, when ambient pressure prevails in the interior, wherein the venting valve comprises a second tube, which is closed on the top and open on the bottom, which, in a wall, has at least a second flow-through opening, which connects the inside of the second tube to the outside of the second tube, wherein the wall of the second tube, at least in the area of the second flow-through opening, is formed as soft elastic, third diaphragm, and the second tube abuts a wall of the second flow-through channel so as to form a seal with the outer rim of the second flow-through opening, when ambient pressure is present on its inside, and the third diaphragm bulges inwards when a suction underpressure is present on the inside, so that the outer rim of the second flow-through opening moves away from the wall of the second flow-through channel.

64. The drinking vessel according to claim 63, wherein the third diaphragm is the bottom of a third depression in the outside of the wall of the second tube.

65. The drinking vessel according to claim 64, wherein, on the inside, the drinking attachment has a second hollow cylindrical holder, into which the second tube is inserted, and the bottom wall has a venting hole, which connects the outside of the bottom wall to the inside of the bottom wall inside the second holder.

66. The drinking vessel according to claim 64, wherein, on the lower rim, the second tube has a second valve flange, which abuts the lower rim of the second holder.

67. The drinking vessel according to claim 64, wherein, on the outside, the second tube has at least a second continued flow channel, which extends from the third diaphragm to the upper end of the second tube.

68. The drinking vessel according to claim 56, wherein the tube and/or wherein the second tube is connected to a gripping tab on the lower end.

Description

[0056] The invention will be discussed in more detail below by means of the enclosed drawings of exemplary embodiments:

[0057] FIG. 1 shows a common drinking vessel comprising a drinking straw in a vertical section;

[0058] FIG. 2 shows a drinking straw of a drinking vessel according to the invention in a perspective view diagonally from the side;

[0059] FIG. 3 shows the same drinking straw in a longitudinal section;

[0060] FIG. 4 shows a drinking vessel according to the invention comprising drinking straw according to FIGS. 2 and 3 in a vertical section;

[0061] FIG. 5 shows the lower end of another design of the drinking straw in side view;

[0062] FIG. 6 shows the lower end of the same drinking straw, inserted into a suction tube in response to suction in a longitudinal section;

[0063] FIG. 7 shows a drinking straw formed in one piece with a bottom wall in side view;

[0064] FIG. 8 shows a drinking attachment of a drinking vessel comprising a mouthpiece in a perspective view from below;

[0065] FIG. 9 shows a valve element for a drinking vessel comprising a mouthpiece in a perspective view from the side;

[0066] FIG. 10 shows the drinking attachment comprising the inserted valve element in closed state in a vertical section;

[0067] FIG. 11 shows the drinking attachment with inserted valve element in the open state in a vertical section;

[0068] FIG. 12 shows a further drinking attachment of a drinking vessel comprising a mouthpiece comprising inserted valve element in a perspective view diagonally from below and from the side;

[0069] FIG. 13 shows the same valve element in a perspective view diagonally from the top and from the side;

[0070] FIG. 14 shows the same drinking attachment comprising inserted valve element with closed drinking valve and venting valve in a vertical section;

[0071] FIG. 15 shows the same drinking attachment comprising inserted valve element with open drinking valve and venting valve in a vertical section;

[0072] FIG. 16 shows a further drinking attachment comprising drinking valve and separate venting valve in a front view;

[0073] FIG. 17 shows the same drinking attachment comprising valve elements in the top view;

[0074] FIG. 18 shows the same drinking attachment comprising valve elements in closed state in a vertical section;

[0075] FIG. 19 shows the same drinking attachment comprising valve elements in the open state in a vertical section;

[0076] FIG. 20 shows the same drinking attachment comprising valve elements in a perspective view diagonally from below;

[0077] FIG. 21 shows the same drinking attachment comprising removed valve elements in a perspective view diagonally from below.

[0078] In this application, the information “top” and “bottom” as well as “horizontal” and “vertical” as well as information derived therefrom, such as “upper side” and “underside” refer to an orientation of the drinking vessel, in the case of which the container axis is oriented vertically, the drinking attachment is arranged on the top and the drinking container is arranged on the bottom.

[0079] In the following discussion of different exemplary embodiments, components comprising the same name are further provided with corresponding reference numerals.

[0080] By means of FIG. 1, the basic structure of the drinking vessel 1 is initially discussed by means of a common drinking vessel.

[0081] According to FIG. 1, the drinking vessel 1 has a drinking container 2 in the form of a drinking cup and a drinking attachment 3 comprising a bottom wall 4 and a threaded ring 5 connected thereto.

[0082] The drinking container 2 has an elongated bottle body 6 comprising a bottle bottom 7 and a substantially sleeve-shaped bottle side wall 8. On the upper end of the bottle side wall 8, the drinking container 2 has a shoulder 9, from the inner circumference of which a cylindrical container neck 10 (bottle neck) rises upwards. The bottle neck 10 surrounds a circular container opening 11.

[0083] The upper front surface of the bottle neck 10 forms a circular ring-shaped opening rim 12, which surrounds the container opening 11. The bottle neck 10 supports an external thread 13 on the outer circumference.

[0084] The drinking container 2 defines an interior 14, which can be filled with a beverage.

[0085] In a cylindrical jacket part 15, the threaded ring 5 of the drinking attachment has an internal thread 16. The upper rim of the jacket part 15 is connected to a threaded ring flange 17, which protrudes inwards. A circumferential sealing profile 18 protrudes downwards from the inner rim of the threaded ring flange 17. The outside of the sealing profile 18 is conical. By screwing the drinking attachment 3 onto the drinking container 2, the conical outer surface can be pressed against the inner rim of the container opening 11 so as to form a seal.

[0086] The bottom wall 4 has a hollow cylindrical holder 19 for a drinking straw. In the example, the holder 19 protrudes downwards from the underside of the bottom wall 4. Approximately at the level of the upper side of the bottom wall 4, it has an upper opening 20, and a lower opening 21 on the lower end. On the lower end, the holder 19 has a conical sealing surface 22, which tapers downwards. Above the sealing surface 22, the holder 19 has a circumferential ledge 23 on the inside.

[0087] At least one venting hole extends in axial direction through the sealing surface 22, wherein the upper end of the venting hole is open into the cavity of the holder 19 and thus towards the surrounding area, and the lower end of the venting hole is open towards the interior 14.

[0088] In the example, a cap 24 of soft elastic material is attached to the upper side of the drinking attachment 3, e.g. by snapping on.

[0089] According to FIG. 1, a common drinking straw 25, into which a common suction tube 26, which is open on the bottom, is clamped on the bottom, is held in the drinking attachment 3. A passage channel 44 extends through drinking straw 25 and suction tube 26. The passage channel 44 can be blocked by bending over the drinking straw 25.

[0090] The drinking vessel 1 according to the invention differs from the common drinking vessel by the design of the drinking straw 25 and of the suction tube 26. A drinking straw 25 of a drinking vessel 1 according to the invention will be discussed by means of FIGS. 2 and 3.

[0091] The drinking straw 25 is smooth on the top and is formed in one piece with a tube 27, which forms a valve element. The lower end of the tube is closed by means of a front wall 28. On the upper end, the drinking straw 25 has a drinking opening 29.

[0092] In the outside of its side wall 30, the tube 27 has a depression 31, which has the geometric shape of a segment of a cylinder shell. In the area of the depression 31, the wall thickness of the side wall 30 is so small that the bottom of the depression 31 forms a soft elastic, deformable diaphragm 32. In the example, the wall thickness of the side wall 30 in the area of the depression is 0.3 mm and 1.3 mm outside of the depression.

[0093] The drinking straw 25 and the tube 27 are made in one piece of a soft elastic plastic, e.g. of polyurethane, silicon or of a thermoplastic elastomer.

[0094] A base 33 protrudes to the outside from the outside of the diaphragm 32. The base 33 is a massive, elongated element, which is oriented in longitudinal direction of the tube 27, comprising a rectangular cross section. Its shape is similar to that of a feather key.

[0095] A flow-through opening 34 extends across the diaphragm 32 and the base 33. The through-flow opening 34 is open on the outside of the base 33 and is closed on the inside of the side wall 30. The outer rim of the flow-through opening 34 is located at a sealing element 35, which protrudes annularly from the outside of the base 33. The height of the base 33 and of the sealing element 35 exceeds the depth of the depression 31, so that the sealing element 35 protrudes outwards on both sides of the depression 31 with respect to the jacket of the tube 27.

[0096] At a distance from its lower end, the tube 27 has an edge 36, which protrudes outwards. Between edge 36 and diaphragm 32, the tube 27 has a plurality of circumferential sealing elements 37 on the outside.

[0097] Above the edge 36, the tube 27 has a flange 38, which has the shape of a hollow truncated cone and which widens to the top. Above the flange 38, a circumferential upper edge 39 is arranged on the outside of the drinking straw 25. In the example, said upper edge is formed on the lower end of a cone section 40, which expands downwards.

[0098] On the outside of the tube 27, an axially oriented continued flow channel 41 is present, which connects the underside of the depression 31 to the lower end of the tube 27.

[0099] The drinking straw 25 is inserted into the holder 19 from below and is pulled through the holder 19 with the cone section 40, until the flange 38 abuts the sealing surface 22 so as to form a seal and the upper edge 39 engages over the ledge 23 in the holder 19.

[0100] A suction tube 26 is further clamped onto the tube 27 from below, until it abuts the edge 36.

[0101] FIG. 4 shows the drinking vessel according to the invention comprising drinking straw 25 and suction tube 26 according to FIGS. 2 and 3.

[0102] FIG. 5 shows a different design of the drinking straw 25, in the case of which the tube 27 is in each case provided with a diaphragm 32, a base 33 and a flow-through opening 34 on diametrically opposite sides.

[0103] FIG. 6 shows the suction tube being slid onto the tube 27 to the edge 26 for the exemplary embodiment of the drinking straw 25 of FIG. 5.

[0104] When ambient pressure is present at the drinking opening 29 on the top on the drinking straw 25, the base or the bases 37 is or are pressed against the wall of the suction tube with the outer rim of the through-flow opening 34 so as to form a seal. Liquid can then not flow out of the interior.

[0105] According to FIG. 6, a suction underpressure is present on the drinking opening 29. The diaphragms 37 thus bulge inwards and the bases 33 lift off the wall of the suction tube 26 with the outer rim of the flow-through opening 34. In this state, liquid can be removed from the interior 14 through the drinking straw 25. The continued flow channel 41 hereby facilitates liquid to continue to flow from the suction tube 26 to the flow-through opening 34.

[0106] The design of FIG. 7 differs from what has been described above in that the drinking straw 25 and the tube 27 are formed in one piece with the bottom wall 4 of the drinking attachment 3. In the case of this design, the bottom wall 4 can be screwed to the upper rim of the drinking container 2 by means of an additional threaded ring.

[0107] According to FIG. 8, the drinking attachment 3 has a mouthpiece 42 on the outside of the bottom wall 4. On the inside, the mouthpiece 42 is defined by a hollow cylindrical holder 43, which protrudes downwards from the underside of the bottom wall 4. On the outside, the drinking attachment 3 has a cylindrical jacket part 5, which is provided with an internal thread 13.

[0108] On the upper end, the mouthpiece 42 has at least one drinking opening 29, which is connected to the cavity in the holder 43, which forms the passage channel 44.

[0109] According to FIG. 9, a valve element has a tube 27, which is open on the top and closed on the bottom. In a side wall 30, a soft elastic diaphragm 32 is formed in the area of a depression 31. From the outside of the diaphragm 32, a circular ring-shaped sealing element 35 protrudes outwards on a base 33. A flow-through opening 34 extends through the sealing element 35 and across the diaphragm 32. The flow-through opening 34 is open towards the outside and towards the inside of the tube 27.

[0110] On the lower end, the tube 27 is connected to a circumferential valve flange 45, which protrudes radially outwards. The valve flange 45 is substantially circular disk-shaped. On the upper side, it has radially extending continued flow channels 41. A collecting channel 46, in addition to the valve flange 45, further circulates on the lower end of tube 27 on the outside of the tube.

[0111] The tube 27 can be clamped into the holder 43 of the drinking attachment 3 from below, until the valve flange 45 abuts the lower rim of the holder 43. The outer rim 35 of the flow-through opening 34 then abuts the inside of the holder 43 so as to form a seal. Liquid in a drinking container 2, onto which the drinking attachment 3 is screwed, can then not escape through the mouthpiece 42. This situation is shown in FIG. 10. When applying suction to the mouthpiece 42, the diaphragm 32 bulges inwards as a result of the internal pressure in the mouthpiece 42, so that the outer rim 35 of the through-flow opening 34 is released from the wall of the holder 43. As a result, liquid can flow through the continued flow channel 41, the flow-through opening 34, the tube 27, and the drinking opening 29 of the mouthpiece 42. This situation is shown in FIG. 11. If suction is no longer applied to the mouthpiece 42, the outer rim 35 of the flow-through opening 34 abuts the holder 43 so as to form a seal again.

[0112] The exemplary embodiment of FIGS. 12 to 15 differs from the exemplary embodiment of FIGS. 9 to 11 in that, on the outside of its side wall 30, the tube 27 has a second depression 47, the bottom of which is a second diaphragm 48. The second depression 47 is arranged diametrically opposite the depression 31 in the side wall 30. On the outside, the tube 27 has a continued flow channel 41, which extends in axial direction and which extends from the second depression 47 to the lower end of the tube 27. The tube 27 has a further continued flow channel 49, which connects the second depression 47 to the depression 31 in circumferential direction.

[0113] A further difference is that the tube 27 has a circumferential flange 38 on the lower end. The flange 37 has the shape of a hollow truncated cone and widens from bottom to top. The flange 38 is preferably formed of soft elastic material in one piece with the tube 27. Its wall thickness is so small that it can be easily deformed.

[0114] On its sealing surface 22, the flange 38 abuts the lower end of the hollow cylindrical holder 43. A venting hole 50, which extends axially through the wall of the holder 43 and the bottom wall 4, connects the sealing surface 22 to the outside of the bottom wall 4. The sealing surface 22 is conical.

[0115] Finally, an approximately circular disk-shaped gripping tab 51 is connected to the lower end of the tube 27 via a web 52. The gripping tab 51 is arranged in a vertical plane.

[0116] The tube 27 is preferably made of soft elastic material in one piece with the gripping tab 51.

[0117] FIG. 14 shows a situation, in the case of which suction is not applied to the mouthpiece 42 and no underpressure prevails in the interior 14 of the drinking container 2. In this situation, the outer rim of the flow-through opening 34 of the tube 27 abuts the wall of the holder 43 so as to form a seal. Liquid cannot flow out of the interior 14 through the mouthpiece 42.

[0118] The flange 38 further abuts the sealing surface 22 so as to form a seal, so that air can also not continue to flow through the venting hole 50 into the interior 14.

[0119] FIG. 15 shows a situation, in which a suction underpressure is present at the mouthpiece 42 and the suction underpressure prevails in the interior 14 of the drinking container. Due to the suction underpressure, the diaphragm 32 is deflected inwards and the outer rim of the flow-through opening 34 is released from the wall of the holder 43. As a result, liquid can flow through of the continued flow channel 48, the second depression 47, the further flow-through channel 49, the depression 31, the flow-through opening 34, the tube 27 and the mouthpiece 42. As a result of the underpressure, the screen-like flange 38 (venting screen) lifts off the sealing surface 2 and air can continue to flow from the outside into the interior 14 through the venting hole 50.

[0120] Pressure peaks caused by liquid, which reaches into the second depression 47 by means of shaking, are absorbed by the second diaphragm 48, so that they do not unintentionally open the drinking valve.

[0121] The exemplary embodiment of FIGS. 16 to 21 differs from the exemplary embodiment of FIGS. 8 to 11 in that, in addition to the drinking valve, a venting valve, which is separated therefrom, is present. For this purpose, the drinking attachment 3 has a second flow-through channel 53, which extends from the outside of the bottom wall 4 to the inside of the bottom wall 4. The venting valve is arranged in the second passage channel 53.

[0122] The venting valve has a second tube 54, which is closed on the top and open on the bottom and which, in a side wall 55, has at least a second flow-through opening 56, which connects the inside of the second tube 54 to the outside of the second tube 54. In the area of the second flow-through opening 56, the side wall 55 of the second tube 54 is formed as soft elastic, third diaphragm 57. The third diaphragm 57 is the bottom of a third depression 58 in the outside of the side wall 55.

[0123] On the outside, the second tube 54 has a second continued flow channel 59, which extends from the third diaphragm 57 to the upper end of the second tube 54.

[0124] On the inside, the drinking attachment 3 has a second hollow cylindrical holder 60, into which the second tube 54 is inserted. The bottom wall 4 has a venting hole 61, which connects the outside of the bottom wall to the inside of the bottom wall inside the second holder 60.

[0125] On the lower rim, the second tube 54 has a second valve flange 62, which abuts the lower rim of the second holder 60.

[0126] The two valve elements or tubes 27, 54, respectively, can have the same diameters. They can further have different diameters in order to prevent mix-ups. Both valve elements can also be connected to one another via a bridge or via a common gripping tab.

[0127] FIG. 18 shows a situation, in the case of which normal pressure prevails in the mouthpiece 42 and in the interior 14. As a result, the outer rim of the flow-through opening 34 of the drinking valve and the outer rim of the second flow-through opening 56 on the outside of a second base 63 of the venting valve abuts the wall of the holder 43 or second holder 60, respectively, so as to form a seal. Liquid can neither flow out, nor can air continue to flow.

[0128] FIG. 19 shows a situation, in which a suction underpressure is present at the mouthpiece 42 and prevails in the interior 14. As a result, the diaphragm 32 is deflected and the flow-through opening 34 of the drinking valve is released, so that liquid can flow out through the mouthpiece 42. The third diaphragm 57 is deflected inwards through the internal pressure in the interior 14 and the second flow-through opening is released, so that air can continue to flow into the interior 14 through the venting hole 61, the second continued flow channel 59, the second flow-through opening 56, and the second tube 54, in order to effect a pressure compensation.