Abstract: A cap (10) for adding additives to a container. The base (12) is a round platform (20) with a vertical axis (18), a container attachment (30), a series of truncated sawteeth (60) extending around the perimeter (36), a through aperture (80) between the bottom and top surfaces, and a spike (84) extending from the aperture. A cylindrical tank (14) has sealed compartments (110) filled with additives arranged in a circle around the axis. A mechanism (16, 32) holds the base and tank together and biases the tank to the base. As the tank rotates, cogs (144) in the tank slide up the tooth ramps (64) to push the tank away from the platform until the cogs reach the tooth plateaus (66). The cogs pass the plateaus where the tank is pulled toward the platform and the spike punctures a seal covering an opening in the aligned compartment.

Abstract: A cap for bottles that allows a user to select additives. A base has an axis with a coaxial cavity, typically threaded, for attachment to the bottle. A housing rotates and reciprocates on the axis between a selecting position where the housing and base are pulled apart and an operative position where the housing and base are pushed together. Compartments with additives and one or more vacant locations are arranged in a circle around the axis inside the housing. An opening in the compartment bottom is covered by a frangible seal. As the housing rotates, the compartment openings or vacant location align with an aperture in the base that extends into the cavity. Spikes extending from the aperture puncture the compartment opening seal when the housing is pushed to the operative position, allowing the additive to flow into the bottle. The vacant locations provide positions for storage and transportation.

Abstract: A cap for bottles that allows the user to select one or more additives. A base has an axis with a coaxial cavity, typically threaded, for attachment to the bottle. A housing rotates and reciprocates on the axis. A mechanism biases the housing from the base on the axis in a storage position. Pushing the housing against the biasing mechanism moves the housing to an operative position. Compartments arranged in a circle around the axis inside the housing hold the additives. An opening in the compartment bottom is covered by a frangible seal. As the housing rotates, the compartment openings align with an aperture in the base that extends into the cavity. Sharp spikes extending from the aperture puncture the seal when the housing is pushed to the operative position, thereby creating a hole for the additive to flow into the bottle.