Lid for beverage containers

A lid for a beverage container comprising:

• a lower lid having a perimeter skirt adapted to secure the lower lid to an opening of the beverage container, a lip portion radially inward from the skirt and extending upward from the skirt and defining an inside surface, an annular portion radially inward from the lip portion and defining a plurality of openings through which liquid from the container may flow;
• an upper horizontal lid retained on the lower lid and having a perimeter edge that is sized to closely conform with the inside surface, the upper lid covering the annular portion in a closed position;
• an annular first vertical wall on the lower lid radially inward from the annular portion and an annular second vertical wall extending downward from a bottom surface of the upper lid and configured to be in close proximity to the first vertical wall;
• and
• a cam interface between the first vertical wall and the second vertical wall, the cam interface comprising one or more channels defined in one of the first vertical wall and the second vertical wall and one or more corresponding projections extending from the other of the first vertical wall and the second vertical wall, the one or more channels being angled to extend from a bottom of the respective vertical wall towards a top thereof, the one or more projections being configured to travel within the one or more channels such that rotation of the upper lid in one direction relative to the lower lid causes the one or more projections to travel upward in the one or more channels, causing the upper lid to rise relative to the lower lid to uncover the openings and allow liquid flow out of the lid, and rotation of the upper lid in the opposite direction relative to the lower lid causes the one or more projections to travel downward in the one or more channels, causing the upper lid to move into contact with the lower lid to cover the openings and restrict liquid flow out of the lid.