Container Upper Plate Handle Mounting Without Weld Corrosion

The patent replaces the welding process (thermal/chemical system) with a mechanical press-fit system. Projections on the holding plate are pressed into corresponding grooves or holes in the upper plate through a press-fit unit, achieving coupling without welding. This mechanical substitution eliminates the harmful thermal effects that damage the tin-plated surface and cause corrosion.

The patent introduces projections and grooves as intermediary coupling elements. The projections on the holding plate fit into grooves or holes in the upper plate, creating a mechanical interlocking system that serves as an intermediary between the two components. This intermediary mechanism enables secure coupling without direct welding contact, preventing corrosion while maintaining coupling efficiency.

The patent segments the coupling interface into multiple engagement points through projections and corresponding grooves or holes. Instead of relying on a single welded area, the mechanical interlocking system distributes the coupling force across multiple projection-groove interfaces. This segmentation enhances the overall coupling strength to support heavy contents while maintaining manufacturing simplicity.

The projections are designed with curved surfaces that fit into the grooves or holes, creating a form-interlocking mechanism. The curved geometry of the projections provides mechanical engagement that resists pull-out forces better than flat welded surfaces, thereby increasing coupling strength while keeping the manufacturing process straightforward.