Container Lid Snap-Fit Mechanism Eliminating Adhesives
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Solution Overview
Problem
Existing container lids require adhesive products for connection, increasing manufacturing costs and time, and existing snap-fit designs lack stability during opening and closing.
Innovation Solution
A container lid design featuring a snap-fitting mechanism with a protrusion and perimeter cavity, and a milled surface finish to prevent rotation, eliminating the need for adhesives and ensuring secure engagement between the inner and external bodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive products are used to connect the two bodies of the lid, then the connection strength is improved, but the manufacturing cost and time increase
Solution Approach 1:
The patent replaces the chemical bonding mechanism of adhesives with a mechanical snap-fit system. The first body includes a protrusion that engages with a corresponding recess in the second body, creating a purely mechanical connection that eliminates the need for adhesive products, thereby reducing manufacturing time and cost while maintaining connection strength
Solution Approach 2:
The lid is divided into two separate bodies (first body and second body) that can be manufactured independently and then assembled through the snap-fit mechanism. This segmentation allows for simplified manufacturing of each component while enabling easy assembly without adhesives, addressing both the strength and time requirements
2Strength
If adhesive products are used to connect the two bodies of the lid, then the connection strength is improved, but the manufacturing cost increases
Solution Approach 1:
The patent replaces the chemical bonding mechanism of adhesives with a mechanical snap-fit system. The first body includes a protrusion that engages with a corresponding recess in the second body, creating a purely mechanical connection that eliminates the need for adhesive products, thereby reducing manufacturing cost while maintaining connection strength
Solution Approach 2:
The snap-fit mechanism is designed to be self-aligning and self-assembling. The geometric features (protrusion and recess) automatically guide the components into correct positioning during assembly, eliminating the need for additional alignment procedures or adhesive application steps, thus reducing both cost and complexity
3Ease of manufacture
If a simple snap-fit design is used to connect the two bodies, then the manufacturing cost is reduced, but the stability during opening and closing deteriorates
Solution Approach 1:
The protrusion and recess are designed with asymmetric geometries that provide both easy assembly and stable engagement. The asymmetric shape ensures that the components can only be assembled in the correct orientation, providing inherent alignment while creating a secure mechanical interlock that prevents unintended movement during operation
Solution Approach 2:
The patent incorporates curved or rounded features in the protrusion and recess designs, which facilitate smooth engagement and disengagement during opening and closing operations. The curved geometry distributes contact forces more evenly, enhancing the stability and reliability of the connection while maintaining the simplicity of the snap-fit mechanism
Data Source
Figure 1~3
AI summary
Improved lid for containers that is made up from an inner body (1) that is fitted to a container on its outside part and by a second external body (2) in such a way that it encloses said inner body (1) by its external face, where the fitting of both bodies (1, 2) to each other is carried out by means of snap fitting, the said fitting together having being provided with a protrusion (3) on the inner edge of the inner body (1) that protrudes perpendicularly to the outside and which has a perimeter cavity (3A) into which a rib (4) is introduced which is an extension from the lower part of the external body (2).