F - Mech Eng,Light,Heat,Weapons – 17 – C
Patent
F - Mech Eng,Light,Heat,Weapons
17
C
F17C 1/00 (2006.01)
Patent
CA 2052777
A thermoplastic pressure vessel consisting of a container having an exterior sidewall, a bottom and an annular top rim. An annular seal surface encircles the top rim. An annular collar extends outwardly and downwardly from the sidewall adjacent the top rim. The downward portion of the collar is spaced from and substantially parallel to the sidewall of the container such that an air cavity is formed between the collar and the sidewall. The collar has a threaded exterior surface. A closure is provided having a top with a depending annular skirt. The skirt has an upper portion of a first diameter with an interior sealing surface and a lower portion of a second diameter larger than the first diameter having a threaded interior surface. When the closure is positioned on the container the interior sealing surface of the upper portion engages the seal surface on the side of the top rim and the threaded interior surface on the lower portion of the skirt engages the threaded exterior surface on the collar to form a threaded connection thereby maintaining contact between the seal surfaces. The threaded connection is partially insulated by the air cavity from inward and outward flexing of the sidewalls of the container resulting from differentials in pressure, and is capable of limited flexion to maintain contact between the seal surfaces when such flexing occurs.
Saf-T-Pak Inc.
Thompson Douglas B.
Van Schilt Charles
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