Lid assembly and drinking container comprising the same

A lid assembly (3) for a drinking container (1), the lid assembly (3) comprising:

• an upper lid member (8) comprising a drinking orifice (4) and a gas vent (5) formed therethrough;
• a closure member (6) pivotally mounted on a top surface of the upper lid member (8) for pivotal movement to close and open the gas vent (5);
• a lower lid member (10) having a window (14) to allow a flow of liquid and gas therethrough, said window in fluid communication with the drinking orifice (4) and the gas vent (5);
• a lever (33) pivotally mounted on the lower lid member (10);
• a baffle plate (37) for closing the drinking orifice (4) and mounted atop the lever (33) to move pivotally along with the pivotal movement of the lever (33);
• and
• a piston (27) movable within the upper lid member (8) in a direction in order to force the lever (33) to pivot downwardly so that the baffle plate (37) moves away from the drinking orifice (4), said piston (27) having a piston head (7) exposed externally;
• wherein the piston (27) is configured such that the piston (27) is permitted to enable the pivotal movement of the lever (33) only when the closure member (6) is moved to open the gas vent (5).