Inventions relating to drinking vessels

1. A lid for a drinking container, the lid including an engagement means for removably securing the lid to the drinking container, the lid being a one piece unit having a deformable spout with a liquid outlet formed in a membrane, the one piece lid further provided with an air inlet for the ingress of air into the container, the air inlet being formed in a membrane and spaced from the liquid outlet, and a bridging portion extending substantially between the liquid outlet and the air inlet, wherein the bridging formation extends from an edge of the liquid outlet membrane to an edge of the air valve membrane, wherein deformation of the spout effects opening of the liquid outlet and the air inlet.

2. The lid as claimed in claim 1 wherein the spout has one or more side walls and the air inlet is disposed at a base of one of the side walls.

3. The lid as claimed in claim 2 wherein the side wall extending towards the air inlet is outwardly concave.

4. The lid as claimed in claim 3 wherein a bridging portion extends along the side wall toward the air inlet.

5. The lid as claimed in claim 4 wherein the bridging portion is integrally formed with the spout.

6. The lid as claimed in claim 5 wherein the bridging portion comprises one of the following: a ridge; one or more ribs; and a channel.

7. The lid as claimed claim 6 wherein the spout is provided with an upper wall in which the liquid outlet is disposed.

8. The lid as claimed in claim 7 wherein liquid outlet membrane is thinner than the remainder of the spout.

9. The lid as claimed in claim 8 wherein the air inlet membrane is thinner than the surrounding material of the lid.

10. The lid as claimed in claim 1 wherein the liquid outlet is in the form of one or more slits which each have a longitudinal dimension aligned with a line of force applied to the spout during normal usage.

11. The lid as claimed in claim 1 wherein the air inlet is in the form of a slit which extends transversely to a line of force applied to the spout during normal usage.

12. The lid as claimed in claim 1 wherein the lid comprises a dispensing portion and a surround portion, the spout and the air inlet being embodied in the dispensing portion and the engagement means being embodied in the surround portion, the surround portion being less flexible than the dispensing portion.

13. The lid as claimed in claim 1 wherein the spout is adapted to receive a straw on an underside of the spout.

14. The lid as claimed in claim 12 wherein the dispensing portion and the surround are integral by having been overmoulded together.

15. A drinking vessel incorporating a container and the lid as claimed in claim 1 wherein the lid is discrete from the container.

16. The drinking vessel of claim 15 wherein the deformable spout is disposed on an upper portion of the vessel in a forward position; the container having a base and a container wall which leans in a forwards direction when the container is seated on its base on a level surface.

17. The drinking vessel as claimed in claim 16 wherein the container wall has a central longitudinal axis which extends at a leaning angle to true vertical when the container is seated on its base on a level surface.

18. The drinking vessel as claimed in claim 17 wherein the container has a tubular wall.

19. The drinking vessel as claimed in claim 17 wherein the container is provided with handle portions which lie at an angle substantially aligned with the leaning angle of the container.

20. The drinking vessel as claimed in claim 16 wherein the deformable spout is in the form of a tubular protrusion from the upper portion, the tubular protrusion being angled such that its upper end extends forwardly.

21. The drinking vessel as claimed in claim 16 wherein the spout is moulded into the lid.

22. The drinking vessel as claimed in claim 16 wherein the base is comprised of a more flexible material than the container.

23. The drinking vessel as claimed in claim 16 wherein the container is transparent so that a content is visible.

24. The drinking vessel as claimed in claim 16 wherein the spout is adapted to receive a straw on an underside of the spout.

25. The drinking vessel as claimed in claim 16 wherein the spout is formed with a cylindrical recess in which to receive a straw, the cylindrical recess including an internal rib defining a limit for insertion of the straw.

26. A dispensing portion for a drinking vessel including:

a deformable spout having a liquid outlet formed in a membrane;

an air inlet spaced from the liquid outlet and formed in a membrane; and

a bridging portion extending substantially between the liquid outlet and the air inlet, wherein the bridging formation extends from an edge of the liquid outlet membrane to an edge of the air valve membrane such that deformation of the spout effects opening of the air inlet.

27. The lid as claimed in claim 26 wherein the spout is formed with a cylindrical recess in which to receive the straw, the cylindrical recess including an internal rib defining a limit for insertion of a straw.

28. The dispensing portion as claimed in claim 27 wherein the bridging portion comprises one of the following: a ridge; one or more ribs; and a channel.

29. The dispensing portion as claimed in claim 27 wherein the liquid outlet membrane is thinner than the remainder of the spout.

30. The dispensing portion as claimed in claim 29 wherein the air inlet membrane is thinner than a surrounding material of the dispensing portion.

31. The dispensing portion as claimed in claim 27 wherein the liquid outlet is in the form of one or more slits which each have a longitudinal dimension aligned with a line of force applied to the spout during normal usage.

32. The dispensing portion as claimed in claim 27 wherein the air inlet is in the form of a slit which extends transversely to a line of force applied to the spout during normal usage.

33. A lid for a drinking container incorporating the dispensing portion as claimed in claim 27 .

34. A dispensing portion for a drinking vessel, the dispensing portion being a unitary construction of flexible material and including:

a deformable spout having a liquid outlet in the form of one or more slits which have a longitudinal dimension aligned with a line of force applied to the spout during normal usage, the liquid outlet being formed in a membrane; and

an air inlet valve spaced from the liquid outlet and formed in a membrane, in a direction of the line of force and having at least one slit extending with a length direction transverse to the line of force; and a bridging portion extending substantially between the liquid outlet and the air inlet valve, wherein the bridging formation extends from an outer edge of the liquid outlet membrane to an outer edge of the air valve membrane;

such that deformation of the deformable spout effects opening of the slits in the air inlet valve and the liquid outlet.

35. The dispensing portion as claimed in claim 34 wherein the bridging portion is an integral formation with the deformable spout.

36. The dispensing portion as claimed in claim 35 wherein the bridging portion comprises an internal ridge.

37. The dispensing portion as claimed in claim 34 wherein the liquid outlet membrane is thinner than the remainder of the spout.

38. The dispensing portion as claimed in claim 37 wherein the air valve membrane is thinner than the surrounding material of a dispensing portion.

39. A lid for a drinking container incorporating the dispensing portion of claim 34 .