Thermoformed Closure Tab Widening for Secure Locking

Solution Overview

Problem

Existing disposable thermoformed plastic lids for containers lack an efficient and cost-effective means to maintain the tab in a closed position, often requiring additional pieces and complex assembly processes.

Innovation Solution

A lid design featuring a body portion, a tab, and a flange portion, where the tab is coupled to the body via a hinge and includes a second locking feature that interacts with a first locking feature on the body, allowing the tab to be maintained in both open and closed positions through interference with the flange portion, which is achieved by widening the tab via heat and/or flattening.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If additional pieces and complex assembly processes are used to maintain the tab in a closed position, then the tab can be securely maintained in both open and closed positions, but the device complexity and manufacturing cost increase

Engineering Contradiction:

Improvetab position maintenanceVSAvoidnumber of components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The locking feature is integrated directly into the tab structure itself, merging the tab function with the locking mechanism. This eliminates the need for separate locking components while maintaining the ability to secure the tab in both open and closed positions, thereby reducing device complexity without sacrificing reliability

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The tab structure includes self-contained locking features that automatically engage and disengage based on tab position. The locking mechanism serves itself without requiring external components or complex assembly processes, simplifying the overall device while maintaining secure position maintenance

Inventive Principle:

Principle #25Self-service

2Reliability

If additional pieces and complex assembly processes are used to maintain the tab in a closed position, then the tab can be securely maintained in both open and closed positions, but the manufacturing cost and assembly time increase

Engineering Contradiction:

Improvetab position maintenanceVSAvoidassembly efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The locking feature is integrated directly into the tab structure itself, merging the tab function with the locking mechanism. This eliminates the need for separate locking components while maintaining the ability to secure the tab in both open and closed positions, thereby reducing device complexity without sacrificing reliability

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The tab structure includes self-contained locking features that automatically engage and disengage based on tab position. The locking mechanism serves itself without requiring external components or complex assembly processes, simplifying the overall device while maintaining secure position maintenance

Inventive Principle:

Principle #25Self-service

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design enables the tab to be efficiently maintained in a closed position without additional components, reducing manufacturing costs and complexity, while also providing a secure and adaptable solution for various container applications.

Implementation Method 1

widening the tab portion may include heating and/or flattening the tab portion of lid

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 2

The hinge is between the tab portion and the body portion

Methodology Applied

Scientific EffectHinge mechanism: Hinge

Data Source

PatentUS12312129B2Thermoformed closure with overlapping tab

Publication Date: 2025.05.27 BORSE ROBERT JOSEPH

AI summary

An apparatus having a body portion and a tab coupled to the body portion via a hinge, wherein the tab comprises a first side edge and a second side edge, and further wherein the tab has a closed position covering an opening in the body and an open position where the opening is uncovered, wherein in the first condition the tab has a first width, and when the tab is in a second condition, the tab has been widened to a second width greater than the first width, and the tab has an outer radial edge that extends towards, but short of, the outer portion of the apparatus, and wherein a flat surface is positioned around the opening, and when the tab is in the second condition the side edges of the widened tab extend over the flat surface when the tab is in the closed position.