Patent ID: 6920991

Claim:
An adapter for attaching over an open end of a container to form a multi-chambered container, the adapter comprising: a base defining a first opening, said base including a first pin and a second pin; and a hollow member including a curved wall defining a second opening, the hollow member also defining a first cam groove and a second cam groove, wherein the hollow member is coupled to the base such that the first pin is slidably received in the first cam groove and the second pin is slidably received in the second cam groove, and such that the hollow member is moveable between a first position in which a portion of the curved wall is disposed to block the first opening, and a second position in which the second opening aligns with the first opening to form a passage through the first second openings, wherein each of the first and second cam grooves defines a first locking region and a second locking region, wherein when the hollow member is in the first position, the first locking region of the first cam groove is biased by the first pin and the first locking region of the second cam groove is biased by the second pin such that the hollow member is biased against the base with said portion of the curved wall disposed to block the first opening, and wherein when the hollow member is in the second position, the second locking region of the first cam groove is biased by the first pin and the second locking region of the second cam groove is biased by the second pin such that the hollow member is biased against the base with said second opening aligned with the first opening.