Abstract: A beverage mixing device includes a primary container, a secondary container mounted in the primary container, a diaphragm removably mounted on the secondary container to seal the lower end of the secondary container, a sliding member movably mounted in the secondary container and having a lower end provided with a cutting blade that is movable to penetrate the diaphragm to connect the secondary container to the primary container and an upper end provided with a helical driven portion, and a top cap removably mounted on the primary container and provided with a helical drive portion abutting the helical driven portion of the sliding member to push the sliding member toward the diaphragm by rotation of the top cap relative to the sliding member.

Abstract: A bottle cap device for a container includes a bottle cap, a subpackage vessel, a guiding structure, and a linkage structure. A retainer groove and a retainer member form a clutch structure, wherein the retainer groove and the retainer member are mated with each other and are disposed between said bottle cap and an outside surface of a top periphery of the subpackage vessel. A circular slotting tool is disposed within a containing cavity, wherein said circular slotting tool has a center hole and a cutting edge protruded on the bottom thereof. The guiding structure is disposed between said slotting tool and said subpackage vessel, wherein when the slotting tool is turned anticlockwise, the guiding structure limits the slotting tool to move downwards.

Abstract: A beverage mixing device includes a primary container, a secondary container mounted in the primary container, a diaphragm removably mounted on the secondary container to seal the lower end of the secondary container, a sliding member movably mounted in the secondary container and having a lower end provided with a cutting blade that is movable to penetrate the diaphragm to connect the secondary container to the primary container and an upper end provided with a helical driven portion, and a top cap removably mounted on the primary container and provided with a helical drive portion abutting the helical driven portion of the sliding member to push the sliding member toward the diaphragm by rotation of the top cap relative to the sliding member.