Patent ID: 6305570
Filing Date: 2001-10-23
Classification: A47G,B65D

Abstract:
A closure assembly for fitting to an open ended drinking vessel comprising a lid with a drinking spout extending therefrom through which liquid can flow when a user sucks on said spout, a flexible resilient diaphragm retained by mounting means on the lid to normally prevent liquid flow through the spout, said diaphragm having a primary sealing portion which cooperates with a seat to make a fluidtight seal therewith, the diaphragm also having a secondary sealing portion which normally covers a breather hole to make a fluidtight seal therewith, the arrangement being such that when a user sucks on the spout, the primary sealing surface is deflected away from the seat to permit liquid flow and the secondary sealing portion no longer makes a fluidtight seal with the breather hole so air can pass therethrough to equalise the pressure across the diaphragm.