Fluid container having a one way valve

Claim 1

A container for fluid comprising: a front flexible wall and a rear flexible wall secured together along certain edge portions thereof to define a body for holding said fluid, and unsecured along outer portions thereof to provide a fluid supply opening; a valve means positioned in said supply opening and having a closed condition and an open condition, said valve means including: a flexible inner sheet; a spring sheet constructed from a flexible, rigid and resilient material, said inner sheet and said spring sheet being opposed to each other and attached to each other along opposite side margins thereof and unattached to each other at the upper and lower ends to form an open ended sleeve like configuration and provide a fluid inlet passageway between the inner sheet and spring sheet, each of said margins being attached to the front and rear walls, said spring sheet extending above said inlet passageway and formed to provide a handle for said container, said upper end of the inner sheet being attached to said front wall and the said rear wall being attached to said handle; a first pocket formed between said one of the walls and said inner sheet; and a second pocket formed between said other wall and said spring sheet, said pockets receiving fluid flowing back from the body of the container toward said valve means to more securely maintain the spring sheet in contact with the inner sheet, said inner sheet and said spring sheet being in contact with each other to provide said valve closed condition for closing said fluid inlet, said spring sheet and said inner sheet responding to the application of an external force and extending outward from each other to provide said open valve condition for opening said fluid inlet, said spring sheet and said inner sheet returning toward each other upon removal of said external force.