DRINKING VESSELS

Abstract

A drinking vessel comprises a bottle, a cup, and a cup lid. The bottle has a bottle base, a bottle mouth, and a bottle wall extending between the bottle base and the bottle mouth, the cup comprises a cup base, a cup mouth, and a cup wall, a first face of the cup base and an inner face of the cup wall define a cup volume, the cup volume is suitable for holding a potable beverage, and the inner face of the cup wall extends from the cup base to a free edge of the cup wall which defines the cup mouth. The cup lid is configured to reversibly engage with one or both of the free edge of the cup wall and the portion of the cup wall adjacent the free edge, and the cup lid is configured to close the cup mouth. The cup base and cup wall are so configured that the bottle base and at least a portion of bottle wall fit into the cup volume with the inner face of the cup wall in close proximity to the portion of a bottle wall. The cup further comprises a lid storage recess in which the lid storage recess is defined by a second face of the cup base and an inner face of a recess wall, the second face of the cup base faces away from the cup volume, and the inner face of the recess wall extends from the second face of the cup base away from the cup volume to a recess wall free edge, the recess wall free edge defines a recess mouth. The cup lid comprises a cup wall engaging means, and drinking aperture, and the cup lid and lid storage recess are so configured that the cup lid reversibly engages with the cup lid storage recess so that the cup lid is reversibly retained in the lid storage recess.

Claims

1. A drinking vessel comprising a bottle, a cup, and a cup lid, in which the bottle has a bottle base, a bottle mouth, and a bottle wall extending between the bottle base and the bottle mouth, the cup comprises a cup base, a cup mouth, and a cup wall, a first face of the cup base and an inner face of the cup wall define a cup volume, the cup volume is suitable for holding a potable beverage, and the inner face of the cup wall extends from the cup base to a free edge of the cup wall which defines the cup mouth, the cup lid is configured to reversibly engage with one or both of the free edge of the cup wall and the portion of the cup wall adjacent the free edge, and the cup lid is configured to close the cup mouth, characterised in that the cup base and cup wall are so configured that the bottle base and at least a portion of bottle wall fit into the cup volume with the inner face of the cup wall in close proximity to the portion of a bottle wall, the cup further comprises a lid storage recess in which the lid storage recess is defined by a second face of the cup base and an inner face of a recess wall, the second face of the cup base faces away from the cup volume, the inner face of the recess wall extends from the second face of the cup base away from the cup volume to a recess wall free edge, the recess wall free edge defines a recess mouth, the cup lid comprises a cup wall engaging means, and drinking aperture, and the cup lid and lid storage recess are so configured that the cup lid reversibly engages with the cup lid storage recess so that the cup lid is reversibly retained in the lid storage recess.

2. A drinking vessel according to claim 1 in which the cup lid is at least partially elastically deformable, and insertion and removal of the cup lid into/out of the lid storage recess requires elastic deformation of the at least part of the cup lid.

3. A drinking vessel according to claim 1 or 2 in which the cup is further comprised of a base cap, in which the base cap is configured to reversibly close the mouth of the lid storage recess.

4. A drinking vessel according to any of claims 1 to 3 in which the cup lid is wholly elastically deformable.

5. A drinking vessel according to any of claims 1 to 4 in which the recess wall comprises at least one retaining projection, in which each retaining projection extends from the free edge of the recess wall or from a portion of the inner face of the recess wall, and each retaining projection extends over a part of the recess mouth or into the lid storage recess.

6 .A drinking vessel according to claim 5 in which at least one retaining projection is a ridge, in which the ridge extends in a longitudinal direction that is substantially parallel to the free edge of the recess wall.

7. A drinking vessel according to claim 6 in which the ridge extends the whole length or substantially the whole length of the free edge of the recess wall.

8. A drinking vessel according to any of claims 5 to 7 in which at least one retaining projection is a retaining plate, the free edge of the recess wall defines a substantially circular recess mouth, and the in which the retaining plate is substantially a circular segment.

9. A drinking vessel according to any of claims 1 to 8 in which the cup wall engaging means of the cup lid is elastically deformable, and insertion and removal of the cup lid into/out of the lid storage recess requires the elastic deformation of the cup wall engaging means.

10. A drinking vessel according to any of claims 1 to 9 in which the cup lid further comprises a deformation zone, the cup wall engaging means of the cup lid extends around the outside perimeter of the cup lid, the deformation zone is approximately parallel to the cup wall engaging means, and insertion and removal of the cup lid into/out of the lid storage recess requires the elastic deformation of the deformation zone.

11. A drinking vessel according to any of claims 1 to 10 in which the cup lid further comprises a first lid element and a second lid element, the first lid element comprises the cup wall engaging means, the drinking aperture, and a rotating joint element, the second lid element comprises a drinking aperture closure element and a rotating joint element, the rotating joint elements of the first and second lid elements combine to form a 360° hinge between the first and second lid elements, and rotation of the second lid element relative to the first lid element may move the second lid element between a closed position where the drinking aperture closure element may close the drinking aperture and an open position where the drinking aperture closure element may not close the drinking aperture.

12. A drinking vessel according to claim 11 in which at least a portion of the second lid element is elastically deformable and deformation of the second lid element when it is in the closed position allows the drinking aperture closure element to close the drinking aperture.

13. A drinking vessel according to claim 11 or 12 in which the cup mouth is substantially planar, and the axis about which the second lid element rotates relative to the first lid element is within about 10 degrees of perpendicular to the plane of the cup mouth when the cup wall engaging means of the cup lid is engaged with the cup wall.

14. A drinking vessel comprising a cup and a cup lid, in which the cup comprises a cup base, a cup mouth, and a cup wall, a first face of the cup base and an inner face of the cup wall define a cup volume, the cup volume is suitable for holding a potable beverage, and the inner face of the cup wall extends from the cup base to a free edge of the cup wall which defines the cup mouth, the cup lid comprises a cup wall engaging means and a drinking aperture, the cup lid is at least partially elastically deformable, the cup lid is configured to reversibly engage with one or both of the free edge of the cup wall and the portion of the cup wall adjacent the free edge, and the cup lid is configured to close the cup mouth, characterised in that which the cup lid further comprises a first lid element and a second lid element, the first lid element comprises the cup wall engaging means, the drinking aperture, and a rotating joint element, the second lid element comprises a drinking aperture closure element and a rotating joint element, the rotating joint elements of the first and second lid elements combine to form a rotating joint between the first and second lid elements, and rotation of the second lid element relative to the first lid element may move the second lid element between a closed position where the drinking aperture closure element may close the drinking aperture and an open position where the drinking aperture closure element may not close the drinking aperture.

15. A drinking vessel according to claim 14 in which at least a portion of the second lid element is elastically deformable and deformation of the second lid element when it is in the closed position allows the drinking aperture closure element to close the drinking aperture.

16. A drinking vessel according to claim 14 or 15 in which the cup mouth is substantially planar, and the axis about which the second lid element rotates relative to the first lid element is within about 10 degrees of perpendicular to the plane of the cup mouth when the cup wall engaging means of the cup lid is engaged with the cup wall.

17. A drinking vessel according to any of claims 14 to 16 in which the cup further comprises a lid storage recess in which the lid storage recess is defined by a second face of the cup base and an inner face of a recess wall, the second face of the cup base faces away from the cup volume, the inner face of the recess wall extends from the second face of the cup base away from the cup volume to a recess wall free edge, the recess wall free edge defines a recess mouth, and insertion and removal of the cup lid into/out of the lid storage recess requires elastic deformation of the at least part of the cup lid.

18. A drinking vessel according to any of claims 14 to 17 in which the cup wall engaging means of the cup lid is elastically deformable, and insertion and removal of the cup lid into/out of the lid storage recess requires the elastic deformation of the cup wall engaging means.

19. A drinking vessel according to any of claims 14 to 18 in which the cup lid further comprises a deformation zone, the cup wall engaging means of the cup lid extends around the outside perimeter.

Description

[0093] With reference to FIGS. 1 and 2, a drinking vessel 2 is comprised of a bottle 4, a cup 6, and a bottle cap 8.

[0094] With reference to FIGS. 3, 4 and 5, the bottle 4 is comprised of an inner skin element 10, a first outer skin element 12, and a second outer skin element 14. The inner skin element 10 is configured so as to fit within and be spaced from the outer skin 10 elements 12 and 14 other than at the mouth rim 16 of the inner skin 10. Mouth rim 16 is adapted to engage with the mouth rim portion 18 of the second outer skin element 14. The mouth rim 16 is adapted to engage with the mouth element 18 by folding, crimping, welding, gluing, or other appropriate joining means.

[0095] The first outer skin element 12 includes a base 20, a side wall portion 22, and an upper rim 24. The upper rim 24 is adapted to engage with a lower rim 26 of the second outer skin element 14. The engagement between the upper rim 24 and the lower rim 26 is again made by folding, crimping, welding, gluing, or other appropriate joining means.

[0096] To construct the bottle, the portion 28 of the inner skin 10 is located within the volume defined by the outer skin 12, the second element 14 of the outer skin is placed over the top of the inner skin 10 and the rims 16 and 18 are joined as are the rims 24 and 26. This creates a void 30 between the inner skin 10 and the now 25 complete outer skin 12/14.

[0097] With reference to FIGS. 6 and 7, the cup 6 is comprised of an outer skin 32 and an inner skin 34. Inner skin 34 comprises a mouth rim element 36 and is configured and dimensioned so as to fit within the outer skin 32 with the mouth rim element 36 in 30 contact with the mouth rim engagement portion 38 of the outer skin 32. The mouth rim element 36 is adapted to be joined to the mouth rim engagement element 38 by welding, use of an adhesive or other fixing means.

[0098] With reference to FIGS. 8, 9 and 10, the bottle cap 8 is comprised of an outer cap element 40 and an inner cap element 42. The inner cap element 42 is dimensioned and configured to fit within the volume defined by the outer cap skin 40. In the illustrated embodiment the inner cap element 42 is fixed into the outer cap skin 40 by way of an adhesive. In other embodiments, not shown, the outer cap skin 40 and 5 the inner cap element 42 are both so configured that the inner cap element 42 is retained in the outer cap skin 40 by friction or a mechanical interference.

[0099] The bottle cap 8 has a handle 44 that is integral with the inner cap element 42. The handle 44 may be used to rotate the bottle cap 8. Rotation of the bottle cap 8 does 10 not cause the inner cap element 42 to wholly or partially come out of the volume defined by the outer cap skin 40 because the inner cap element 42 is either permanently or reversibly fixed in outer cap skin 40. The handle 44 of the inner cap element 42 includes an aperture 46 which allows a hook, loop or other fixing means to be engaged with the bottle cap 8. That fixing means may also be attached to the bottle 4 so as to avoid loss of the cap 8, or may be used to attach the bottle to some external object, for example a rucksack or belt so that the drinking vessel is not lost.

[0100] With reference to FIG. 2, the cup 6 comprises a cup base 46 which is circular, a side wall 48, and a recess wall 50. The recess wall 50, together with the cup base 46, defines a storage recess. The storage recess has a storage recess mouth 52 which is defined by recess wall free edge 53 and faces directly away from the bottle cap 4.

[0101] With reference to FIGS. 11, 12 and 13, the bottle 2 of the illustrated embodiment of the present invention further comprises a cup lid 54. The cup lid 54 is comprised of a lid band 56, a lid plate 58 and a deformation zone 51 radially inside the lid band 56. The lid band 56, deformation zone 51, and lid plate 58 are formed from an elastomeric material, for example a silicone rubber, and are integral with each other.

[0102] The cup lid 54 includes a first drinking aperture 62 and a vent aperture (not shown).

[0103] The lid 54 is dimensioned so that it can reversibly be located within the storage recess defined by the recess walls 50 and the cup base 46. The free edge 53 of the recess walls 50 includes a retaining plate 55 and a retaining ridge 57. The retaining plate has the form of a circular segment which partially closes the mouth of the storage recess. The retaining ridge 57 extends around the portion of the free edge 53 not engaged with the retaining plate 55 and again partially closes the mouth of the retaining plate. The dimensions of the lid and the storage recess are such that when the lid 54 is pushed into the storage recess the lid band 56 and deformation zone 51 are elastically deformed/compressed so that the lid can pass through the aperture defined by the retaining plate 55 and retaining ridge 57. Once within the storage recess some of the elastic deformation may be reversed and the still deformed lid band pushes against the inside face of the recess wall 50. The push against the inside face of the recess wall 50, the retaining plate 55 and the retaining ridge 57 serve to retain the cup lid in the storage recess. A user can deform the lid band 56 and deformation zone 51 to remove the cup lid 54 from the storage recess. The dimensions of the retaining plate 55 are such that the aperture 62 and immediately surrounding lid band 56, that is the portion of the lid band that a user is likely to contact with their lips when drinking out of the aperture 62, of the cup may be fully covered by the retaining plate when the cup lid is in the storage recess. This is desirable for hygiene reasons.

[0104] The dimensions of the mouth of the cup 6 and the dimensions and configuration of the lid band 56 are such that the lid band 56 may sealingly and reversibly grip the portion 68 of the cup and close the mouth of the cup.

[0105] With reference to FIGS. 14, 15, 16 and 17, an alternative embodiment of a cup lid 154 is shown. The cup lid 154 is comprised of a first lid element 186 and a second lid element 188. The first lid element 186 includes an aperture 162 through which a user may drink, a lid rim 156, and a deformation zone 151. The first lid element also includes a circular aperture defined by an edge 190 which is configured to receive a hinge pin 192 which is part of the second lid element 188. The aperture is circular in the plane of the upper (as seen in FIG. 15) face of the first lid element 186.

[0106] The second lid element 188 includes the hinge pin 192, an aperture closure element 194, a breather hole 200, and an arcuate slit 196. The hinge pin 192 is configured to be in sliding engagement with the edge 190 of the first lid element 186 and be able to rotate within the aperture defined by the edge 190 about the hinge pins longitudinal axis. The aperture closure element 194 is located between the arcuate slit 196 and the radially outer edge of the second lid element 188 and approximately midway along the arcuate slit 196.

[0107] The first and second lid elements 186, 188 are both formed from a food grade silicon rubber and are elastically deformable.

[0108] Rotation of the hinge pin 192 about its longitudinal axis may move the second lid element from an open position as shown in FIG. 15 to a closed position shown in FIG. 17.

[0109] In the open position the aperture 162 is open and a user may drink through the aperture 162.

[0110] In the closed position the aperture closure element 194 is in the aperture 162 and prevents the flow of liquid through aperture 162.

[0111] Movement of the second lid element 188 from the open position to the closed position causes the closure element 194 to interfere with a portion of the lid rim 156. To overcome that interference the arcuate slit 196 allows the portion of the second lid element 188 to flex away from the lid rim 156 until the aperture closure element 194 enters the aperture 162 at which time the flexed portion of the second lid element returns to its original non-flexed position.

[0112] The lid 154 fits into the storage recess in the same fashion as the lid 54 shown in FIGS. 11 to 13. In this instance, however, there is no retaining plate and the retaining ridge 57 extends the full way around the mouth of the storage recess. The lid 154 fits onto the cup in the same fashion as the lid 54.

[0113] The bottle 4 is comprised of a lower region 70 which extends from adjacent to the bottle base 20 to a first intermediary position 74. The outside face of the outer skin 12 substantially forms the whole of the lower region 70. Spaced from the first intermediate position 74 is a second intermediate position 76 and the upper region of the bottle extends from the second intermediate position 76 to a second position 78. The bottle 4 tapers from the second position 78 toward the mouth of the bottle.

[0114] Between the first and second intermediate positions 74, 76 the bottle wall is a single 30 skin to form a waist 80 which has a smaller cross section than either the lower region of the bottle 70 at the first intermediate position 74 or the upper region of the bottle 72 at the second intermediate position 76. That waist has located within it a seal ring 82 which is held in positon by elastic deformation of the seal ring and the ends of the 17 lower region 70 and upper region 72. The seal ring 82 is configured so that the engagement portion 68 of the cup 6 overlies and compresses the seal ring 82 when the cup 6 is pushed into a position where it overlies the whole of the lower region 70 and engages with the seal ring 82. The seal ring 82 is preferably of an elastomeric material such as silicone and thermally insulates the waste 80 portion of the bottle 4.

[0115] The space 30 between the inner skin and outer skins of the bottle 4 is, in the illustrated embodiment, filled with air. Air is a good insulator and as such the bottle 4 is insulated and can keep hot beverages hot or cold beverages cold. The lower portion 70 of the bottle is further thermally insulated by the cup 6 which, again, has 10 air located between the cup outer skin 32 and cup inner skin 34.

[0116] In the illustrated embodiment of the present invention there is a small space between the inside face of the inner skin 34 of the cup 6 and the outside face of the outer skin 12 of the bottle 4. In other, non-illustrated, embodiments the dimensions of 15 the cup and the bottle are such that the inner face of the cup 6 is in sliding contact with the outer face of the lower region 70 of the bottle 4.

[0117] In use, a beverage, for example hot coffee, is stored within the volume 84 defined by the inner face of the inner skin 10 of the bottle 4 until a user wishes to drink that 20 beverage. The cup 6 is located so that it is overlying the lower region 70 of the bottle 4 and retained in that position. When a user wants to drink some or all of the beverage, the user takes the cup 6 off the base of the bottle 4 and takes the cup lid 54 out of the storage recess at the base of the cup. The bottle cap 8 is removed and the beverage poured in to the cup 6. The cup lid 54 is placed into the mouth of 25 the cup 6. The cup 6 now acts as an insulated travel mug and allows the user to sip the beverage through the drinking aperture 62 of the cup lid 54. When the user has finished drinking their beverage the cup lid 54 is placed back into the storage recess and the cup 6 back into position on the bottle 4.

[0118] The drinking vessel 2 of the illustrated embodiment is, unless indicated otherwise, formed from elements made from stainless steel. This has the benefit of producing a robust drinking vessel which, without surface treatment, is resistant to reaction with 18 the beverage.

Statements of invention

[0119] 1. A drinking vessel comprising a bottle, a bottle cap and a cup in which the bottle is comprised of a bottle base, a bottle mouth and one or more bottle side walls, an edge of the or each bottle wall is joined to the bottle base, the or each bottle wall extend between the bottle base and the bottle mouth, the or each edge of the bottle wall remote from the bottle base defines the bottle mouth, and the or each bottle wall has an inner face, which defines the volume within the bottle in which a beverage may be held, and an outer face,

[0120] the bottle cap is configured to reversibly close the bottle mouth,

[0121] the cup is comprised of a cup base, a cup mouth and one or more cup walls, the or each cup wall are joined to the cup base, the or each cup wall extend between the cup base and the cup mouth, an edge of the or each cup wall remote from the cup base defines or is adjacent to the cup mouth, and the or each cup wall has an inner face which defines the volume within the cup in which a beverage may be stored, and an outer face,

[0122] characterised in that

[0123] the bottle comprises a lower portion and an upper portion in which the lower portion extends from the bottle base to a first intermediate position between the bottle base and the bottle mouth, the upper portion extends from a second intermediate position to a second position where the second intermediate position is between the first intermediate position and the second position, and the second position is between the second intermediate position and the bottle mouth,

[0124] the cup is configured and dimensioned so that it can reversibly overlie the bottle base and at least a portion of the outer face of the lower portion of the bottle with 25 the inner face of the or each cup wall in contact with or close proximity to the outer face of the lower portion of the bottle, and

[0125] the outer face of the or each cup wall adjacent to or at the cup mouth is of substantially the same dimensions as the dimensions of the outer face of the upper portion of the bottle at or adjacent to the second intermediate position.

[0126] 2 A drinking vessel according to statement 1 in which at least a substantial portion of the lower portion of the bottle side wall or walls has wall thickness of up to a first wall thickness, at least a substantial portion of the upper portion of the bottle side wall or walls has a thickness of at least a second wall thickness, and the second wall thickness is greater than or equal to the first wall thickness.

[0127] 3 A drinking vessel according to statement 2 in which at least a substantial portion of the upper portion of the bottle side wall or walls is constructed to thermally insulate 5 the content of the volume defined by the inner face of the bottle wall or walls from the outside of the bottle.

[0128] 4 A drinking vessel according to statement 2 or 3 in which at least a substantial portion of the upper portion of the bottle side wall or walls is constructed from an inner bottle skin and an outer bottle skin, the inner and outer bottle skins are spaced from each other, and the space between the inner and outer bottle skins is filled with at least one of a gas substantially at atmospheric pressure, a gas below atmospheric pressure, a solid insulating material, or a liquid insulating material.

[0129] 5 A drinking vessel according to any of statements 2 to 4 in which at least a substantial portion of the lower portion of the bottle side wall or walls is constructed from an inner bottle skin and an outer bottle skin, in which the inner and outer bottle skins are in contact with each other.

[0130] 6 A drinking vessel according to any of statements 2 to 4 in which at least a substantial portion of the lower portion of the bottle side wall or walls is constructed from an inner bottle skin and an outer bottle skin, in which the inner and outer bottle skins are spaced from each other, and the space between the inner and outer bottle skins is filled with at least one of a gas substantially at atmospheric pressure, a gas below atmospheric pressure, a solid insulating material, or a liquid insulating material.

[0131] 7 A drinking vessel according to any of statements 1 to 6 in which the first and second intermediate positions are substantially coincident with each other.

[0132] 8 A drinking vessel according to statement 7 in which there is a step change in thickness of the bottle side wall at the first/second intermediate position.

[0133] 9 A drinking vessel according to statements 7 or 8 in which the drinking vessel further comprises a seal ring, and the seal ring overlies the outer face of a portion of the lower portion of the bottle side wall or walls.

[0134] 10 A drinking vessel according to any of statements 1 to 6 in which the first and second intermediate positions are spaced from each other, and the portion of the bottle wall or walls between the first and second intermediate positions has outer dimensions smaller than both the lower portion at or adjacent to the first intermediate position and the upper portion at or adjacent to the second intermediate position.

[0135] 11 A drinking vessel according to statement 10 in which the drinking vessel further comprises a seal ring, and the seal ring overlies the portion of the bottle wall or walls between the first and second intermediate positions.

[0136] 12 A drinking vessel according to statement 9 or 11 in which the seal ring is an elastomeric material.

[0137] 13 A drinking vessel according to statement 12 in which the seal ring is a silicone material.

[0138] 14 A drinking vessel according to any of statements 9, or 11 to 13 in which the seal ring and cup are dimensioned and configured so that the cup mouth can be reversibly pushed into a position in which a portion of the inner face of the cup at least partially overlies and compresses the seal ring.

[0139] 15 A drinking vessel according to any of statements 1 to 14 in which at least a portion of the cup side wall or walls is constructed from an inner cup skin and an outer cup skin spaced from each other, and the space between the inner and outer cup skins is filled with at least one of a gas substantially at atmospheric pressure, a gas below 30 atmospheric pressure, a solid insulating material, or a liquid insulating material.

[0140] 16 A drinking vessel according to any of statements 1 to 15 in which the cup further comprises a storage recess and a cup lid, characterised in that the cup lid is configured to reversibly engage with the cup mouth and or cup wall or walls adjacent the cup mouth, and the storage recess is configured to reversibly retain the cup lid within the storage recess.

[0141] 17 A drinking vessel according to statement 16 in which a portion of the cup lid which engages with the cup mouth and or cup wall or walls adjacent the cup mouth and or with the storage recess is elastically deformable.

[0142] 18 A drinking vessel according to any of statements 1 to 17 which further comprises an upstanding portion extending from the centre of the cup lid away from the volume defined by the cup when the cup lid is closing the mouth of the cup, the outer face of that upstanding portion comprises one or more screw threads, the storage recess further comprises a bore, and the bore comprises one or more matching screw threads on the inside face of the bore.

[0143] 19 A drinking vessel according to any of statements 1 to 17 in which the cup lid further comprises a bore extending into the cup lid toward the volume defined by the cup when the cup lid is closing the mouth of the cup, the inside face of the bore comprises one or more screw threads, the storage recess further comprises an upstanding portion extending from the cup base with one or more matching screw threads on the outer face of that upstanding portion.

[0144] 20 A drinking vessel according to any of statements 16 to 19 in which storage recess is defined by the cup base and one or more storage recess side walls, and the one or more storage recess side walls extend in a direction away from the cup mouth.

[0145] 21 A drinking vessel according to any of statements 16 to 20 in which the cup lid defines one or more apertures through the lid.

[0146] 22 A drinking vessel according to statements 21 in which the cup lid is configured to 30 allow one or more of the apertures to be reversible closed.

[0147] 23 A drinking vessel according to any of statements 1 to 22 in which the bottle cap is comprised of an outer cap skin and an inner cap element, the outer cap skin is configured and dimensioned to reversibly engage with the bottle mouth or the bottle wall or walls adjacent the bottle mouth, and the inner cap element is configured to engage with the outer cap skin.

[0148] 24 A drinking vessel according to statements 23 in which the engagement between the outer cap skin and the bottle wall or walls adjacent the bottle mouth is via a right hand thread, and the engagement between the outer cap skin and the inner cap element is via a left hand thread.