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US 4,305,772 AGranted
Method for forming an interlocked assembly
OwnerEmery I. Valyiinventor
Life of this patent
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Abstract
Method of forming an interlocked assembly of a base cup and a hollow plastic article including the steps of providing a groove in the side wall of either the article or cup engageable with a protrusion in the side wall of the other of said article or cup, internally pressurizing the article to harden same and outwardly expand the side walls, and forming an interlocked assembly by placing the base cup on the article to deform the side walls of the base cup by the hardened article and snap the groove and protrusion together.
Claims8
A method for forming an interlocked assembly of a base cup and a hollow plastic article which comprises:
- providing a hollow plastic article having a base portion, integral side wall, and an integral open neck or rim portion;
- providing a hollow base cup for said article engageable therewith, said cup having a base portion, integral side wall substantially shorter than said article side wall and an integral open neck;
- providing a groove in the side wall of one of said article or cup engageable with a protrusion in the side wall of the other of said article or cup;
- internally pressurizing said article to harden same and outwardly expand the side wall;
- placing the base cup on said article to deform the side wall of the base cup by the hardened article and snap said groove and protrusion together;
- and releasing the internal pressure, whereby an interlocked assembly is formed whether said article is pressurized or unpressurized.
3 more elements
Dependencies are inferred from the claim text.