US Patent 7073678 Travel beverage container

A beverage container has a thermally insulated base defining a reservoir and a cover assembly removably mountable on the base for closing the reservoir. The cover assembly includes a cap defining a recess open to ambient and defines a baffled passage between the recess and the reservoir closeable by a valve assembly including a toggle mechanism actuatable by a push button disposed centrally of the cap and spaced from the recess, for alternately latching the valve in closed and open conditions relative to the passage. The valve assembly includes a gasketed movable valve member engageable with a rigid sharp edge on a valve seat in the closed condition so that the gasket yieldably deforms around the sharp edge to provide a fluid-tight seal.