Child-Resistant Package Locking Mechanism Design
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Solution Overview
Problem
Existing packaging solutions fail to effectively prevent children and the elderly from accessing and ingesting substances contained within, as they do not provide sufficient resistance to opening, leading to safety concerns.
Innovation Solution
A package design featuring a base, primary lid, and a locking mechanism with a flexible member and arms that engage in a specific manner to require complex motions to open, utilizing a flexible rib and contact structures to secure the lid in a closed position and allow opening only when specific forces are applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple lid closure is used, then ease of operation is improved, but child-resistant safety deteriorates
Solution Approach 1:
The locking mechanism uses a flexible member that can dynamically transition between engaged and disengaged states. The flexible member bends to allow lid opening when force is applied, then returns to its original shape to automatically re-engage the locking arms, providing both safety and operational capability.
Solution Approach 2:
The locking mechanism is divided into separate functional components: locking arms that extend from the lid, a flexible member with engaging structures, and contact structures on the outer wall. This segmentation allows each component to perform its specific function while working together to provide child-resistant safety.
2Reliability
If a locking mechanism with multiple components is implemented, then child-resistant safety is improved, but device complexity increases
Solution Approach 1:
The flexible member automatically returns to its original shape after being bent, causing the locking arms to automatically re-engage with the contact structures without requiring user intervention. This self-service feature reduces the need for additional control mechanisms and simplifies the overall system.
Solution Approach 2:
The flexible member is implemented as a thin, bendable component that provides the necessary mechanical function through its flexibility. This approach reduces material usage and structural complexity compared to rigid locking mechanisms while maintaining child-resistant safety.
3Reliability
If the flexible member is made more rigid, then locking reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The flexible member is designed with specific material and geometric parameters that allow it to bend under controlled force while maintaining sufficient rigidity to provide reliable locking. The flexibility and rigidity are balanced through parameter optimization rather than extreme values.
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
The package design enhances child-resistant access by requiring complex motions to open, thereby reducing the risk of accidental or intentional access to substances, meeting safety standards for child-resistant packaging.
Implementation Method 1
The flexible member may be configured to flex inwards from a relaxed position to a flexed position based on flexing of the flexible rib in response to a first force being applied to the contact structure
Implementation Method 2
The flexible member may be further configured to return to the relaxed position absent the first force
Data Source
AI summary
A package includes a base, a lid, and a locking mechanism. The locking mechanism includes an arm and a flexible member. The arm extends from the lid and has a first engaging structure. The member includes a flexible rib connected to a base floor, and a second engaging structure and a contact structure on a rib outer surface. The member flexes in response to a first force applied in a first direction to the contact structure and relaxes in response to absence of the first force. The member engages the first and second engaging structures based on the member being relaxed while the lid is closed. The member disengages the first and second engaging structures based on the member being flexed while the lid is closed. The lid may be opened based on applying a second force to the lid in a second direction while the member is flexed.