Cover device for a drink container

A cover device for a drink container, the cover device comprising:

• a basic assembly that includes a housing with a spout portion, the housing having a locally supporting hinge contact surface portion, and the spout portion having a drink opening;
• and
• a valve arrangement that comprises a valve element having first and second portions which are integral with each other through an area of the valve element that corresponds with a position of the locally supporting hinge contact surface portion in response to the valve element being hingably associated with the basic assembly at the locally supporting hinge contact surface portion, wherein only the first portion of the valve element is configured for being directly influenced, via a passage to the drink opening, to block or unblock the passage to the drink opening, wherein the second portion of the valve element is not configured for being directly influenced, via the passage to the drink opening, to block or unblock the passage to the drink opening, and wherein the first and second portions of the valve element are configured in size, position, and orientation for (i) assuming a leakproof closed state that includes the valve element having a smaller total moment of force on the first portion of the valve element than on the second portion of the valve element in response to the valve element being subjected to an overpressure prevailing at a side of the cover device adapted to face the drink container, and (ii) assuming an open state in response to the valve element being subjected to an underpressure prevailing from a side of the cover device having the drink opening,
• wherein the valve element further comprises one selected from the group consisting of (i) wherein the first portion comprises an edge portion for contacting a surface portion of the basic assembly, (ii).wherein the first portion of the valve element is provided with a slit, (iii) wherein the valve element comprises a membrane having an outer periphery ring-shaped portion surrounding a central portion, and (iv) wherein the valve element is hingably associated with one of an end surface of the spout portion, an end surface of an interior body of the housing, and a portion of an interior surface of the spout portion.