Abstract: A closure system for a drinking bottle or other container is disclosed. The closure system comprises a bottle and a bottle closure. The bottle closure, in turn, comprises among its components a cap interface manipulated directly by the user's hand, a platform that translates vertically in relation to the cap interface, and a flexible annular stopper body directly manipulated by the platform. When the bottle closure is placed on the open bottle neck and the cap interface is pushed downward toward the bottom of the bottle, a lever-based mechanism forces opposite upward movement of the platform. The platform squeezes the stopper body, and at the end of the downward pushing motion, the system is locked in a static position. The squeezed stopper body forms a liquid-tight seal with the bottle, while holding potential energy via elastic deformation. From this sealed position, the cap interface may be radially twisted relative to the bottle, releasing the locked platform and the stopper's potential energy.

Abstract: A closure system for a drinking bottle or other container is disclosed. The closure system comprises a bottle and a bottle closure. The bottle closure, in turn, comprises among its components a cap interface manipulated directly by the user's hand, a platform that translates vertically in relation to the cap interface, and a flexible annular stopper body directly manipulated by the platform. When the bottle closure is placed on the open bottle neck and the cap interface is pushed downward toward the bottom of the bottle, a lever-based mechanism forces opposite upward movement of the platform. The platform squeezes the stopper body, and at the end of the downward pushing motion, the system is locked in a static position. The squeezed stopper body forms a liquid-tight seal with the bottle, while holding potential energy via elastic deformation. From this sealed position, the cap interface may be radially twisted relative to the bottle, releasing the locked platform and the stopper's potential energy.