One material, one piece spill-proof closure

Abstract

This invention relates to a closure for a drinking container and is particularly concerned with spill-proof closures, which remain in place while drinking. The inexpensive, effective and durable closures according to this invention are suitable for both disposable and nondisposable applications where both cost and performance are important.

Description

[0001] This application claims the benefit of Provisional Application No. 60 / 278.645, filed Mar. 26, 2001.[0002] The present invention is directed to containers that hold liquids, preferably drinking containers, having spill-proof closures. Specifically, this invention comprises a spill-proof closure that remains in place while drinking. The inexpensive, effective and durable closures according to this invention are suitable for both disposable and nondisposable applications where both cost and performance are important.[0003] In several prior art arrangements, a valved spout is used to prevent unintentional loss of liquid (see, for example. U.S. Pat. No. 5,050,758 to Freeman et al.).[0004] However, embodiments of this approach are relatively complex, multi-piece structures which are costly to make and do not lend themselves to mass production methods or disposable applications.[0005] Another prior art approach is to attach a separate thin membrane component to the inner or outer su...

AI Technical Summary

Benefits of technology

0020] FIGS. 8A and 8B are additional close-up sectional views of the entry and exit regions of a preferred embodiment closure showing the wall thickness variation with the chamfers shown. The edges are chamfered or rounded to prevent mechanical binding between mating edges.

Problems solved by technology

However, embodiments of this approach are relatively complex, multi-piece structures which are costly to make and do not lend themselves to mass production methods or disposable applications.

However, this approach also involves costly production of multiple components and / or costly production by multiple operations.

The relatively high cost of making such closures is not appealing or suitable for the disposable market where cost is a critical factor.

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