Closure assembly for a drinking vessel
AssigneeCannon Rubber Limited, A British Company
InventorsEdward Atkin, Roger Leonard Williams
Life of this patent
Estimating the term…
Abstract
A closure assembly for a drinking vessel comprising a lid (2) with a spout (3). A diaphragm valve (14) is mounted on a central spigot (7) of an insert which protrudes from the bottom of the spout (3) and has an enlarged head (8) which provides a sealing surface (9) which cooperates with a bead (16) around a central hole (22) in the diaphragm. The diaphragm (14) has an annular flap (18) at its periphery which normally closes a breather hole (4) in the lid (2) but opens when a user sucks on the spout (3) to allow air to enter container (1) to equalize the internal and external pressure when liquid flows past the diaphragm (14).
Claims24
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.
Dependencies are inferred from the claim text.