Patent ID: 8646640

Claim:
A collapsible beverage container comprising: a plurality of co-axially oriented, concentric cylindrical wall sections of progressively different diameters, the wall sections being extendable from a collapsed position wherein the wall sections substantially completely overlap in an axial direction to an extended position wherein the wall sections only partially overlap in an axial direction; and a lock for maintaining the wall sections in the extended position, the lock comprising a radially inwardly projecting lip at an end of one wall section extending around a portion of the periphery thereof and a radially outwardly projecting lip at an end of an adjacent wall section extending around a portion of the periphery thereof, the one wall section and the adjacent wall section are part of the plurality of cylindrical wall sections, the inwardly and outwardly projecting lips being adapted to axially pass each other upon extension of the wall sections and, upon relative rotation of the wall sections, to slideably connect and maintain relative axial position of the wall sections in the extended position; a radially outwardly projecting stop extending along the peripheries of each wall sections, the stop adapted to prevent overextension of the wall section; a groove between the outwardly projecting lip and the outwardly projecting stop; a first detent on the inwardly projecting lip and a second detent positioned in the groove whereby the first and second detects lock together upon extension and rotation of the wall sections an indicator positioned adjacent the second detent adapted to visually confirm the wall section locked with the adjacent wall section; and a view aperture extending through the wall section on the inwardly projecting lip alignable with the indicator when first and second detents are in the locked position.