Patent ID: 8403164
Filing Date: 2013-03-26
Classification: A47G,B65D

Abstract:
1. A cap for closing a liquid beverage container, the container having an interior, the cap comprising a hole, a demand valve and a spout; the spout allowing the beverage to be sucked out of the container through the spout, while preventing spillage when no suction takes place; the demand valve comprising a valve inlet port in fluid communication with the container for admitting beverage from within the container into the demand valve, a discharge port in fluid communication with the spout, such that beverage admitted into the demand valve through the valve inlet port is sucked out through the discharge port and out through the spout, and a control port communicating with an ambient atmosphere through the hole in the cap; wherein the demand valve further comprises a valve seat and a valve closure element controlling the flow from the valve inlet port to the discharge port, the valve closure element being urged by a pressure in the container to move in a direction to seal against the valve seat in a closed position, and being urged to move to an open position in dependence on an excess of a pressure in the control port over a pressure in the discharge port; wherein the valve closure element moves to open the demand valve in an opposite direction to a direction of a flow of liquid through the demand valve; wherein the demand valve is formed by first and second members that are mounted on an inner side of the cap, the first member being rigid, having an outer rim, and defining the valve inlet port and the valve seat, and the second member comprising the valve closure element and further comprising a resilient membrane connected to the valve closure element as a pressure sensitive diaphragm, the second member sealing around the hole in the cap, and the second member surrounding and sealing against the entirety of the outer rim of the first member in the closed position of the demand valve.