Lid Assembly Rim Profile for Jam-Free Closure

The patent applies local quality by creating a specific geometric profile (with first, second, and third portions) at the critical rim surface location where the lid contacts the coupling ring. This localized structural feature provides positioning guidance without requiring complex mechanisms throughout the entire lid assembly, thus maintaining manufacturing simplicity while improving positioning accuracy.

The rim surface profile is designed in advance with specific geometric features (first portion, second portion, third portion) that preliminarily guide the lid into the correct closing position before final contact is made. This preliminary geometric arrangement prevents jamming by ensuring proper alignment is established prior to the critical closing moment.

The patent implements reliability through a localized geometric profile at the rim surface rather than complex mechanisms throughout the entire structure. The specific shape with multiple portions (first, second, third) provides targeted positioning guidance that prevents jamming while keeping the overall device structure simple and easy to manufacture.

The lid assembly design allows the lid itself, through its specially profiled rim surface, to guide its own positioning and prevent jamming without requiring additional complex positioning mechanisms or external assistance. The geometric features self-align the lid with the coupling ring during closing.