Child-Resistant Closure With Force-Insulating Links
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Solution Overview
Problem
Existing child-resistant 'squeeze-to-release' closures face challenges in balancing ease of access for adults while preventing access by children, often due to issues with the amount of deflection permitted, which can result in difficulties releasing the lugs.
Innovation Solution
A child-resistant closure design featuring pressing pads connected to the body wall by force-insulating links that restrict lateral spreading of forces, allowing for maximized deflection and preventing dust traps, with a 'batwing' configuration and differential thickening or materials to isolate the pressing force, and cut-outs in the inner skirt for increased deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pressing pad is directly connected to the sidewall, then the structure is simple and rigid, but the deflection of the pad is restricted making it difficult to release the locking means
Solution Approach 1:
The connection between the pressing pad and sidewall is segmented into discrete force-insulating links rather than a continuous rigid connection. These links are spaced apart to create isolation zones that prevent force propagation, allowing the pad to deflect independently without compromising overall structural integrity.
Solution Approach 2:
Force-insulating links serve as intermediary elements between the pressing pad and the sidewall. These links transmit minimal force and isolate the pad from the rigid sidewall structure, enabling sufficient deflection for latch release while maintaining structural support.
2Ease of operation
If the pressing pad allows significant deflection, then it is easier to open for adults, but it may become too easy for children to gain access
Solution Approach 1:
The force-insulating links are designed with specific geometric parameters (length, thickness, material properties) that allow controlled deflection within a specific range. This parameter optimization ensures sufficient movement for adult operation while maintaining enough structural resistance to prevent easy access by children.
Solution Approach 2:
The connection structure exhibits local quality variation: the force-insulating links provide flexibility and isolation locally at the pad connection points, while the overall sidewall structure maintains global rigidity and strength to preserve child-resistance properties.
3Ease of manufacture
If the pad is directly integrated into the sidewall, then manufacturing is simpler, but it creates dust traps and trapping risks at the interface
Solution Approach 1:
The pressing pad is extracted from direct integration with the sidewall and connected through separate force-insulating links. This extraction creates a modular connection that eliminates recesses and interfaces where dust could accumulate, while maintaining the structural function of the sidewall-pad connection.
4Ease of operation
If force-insulating links are used to isolate the pad, then deflection is maximized, but the structure becomes more complex
Solution Approach 1:
The force-insulating links function as flexible yet isolating elements that allow pad deflection while preventing force transmission to the sidewall. These thin, link-like structures provide the necessary mechanical isolation with minimal added complexity compared to rigid direct connections.
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 solution enhances the deflection of pressing pads, improving the ease of opening for adults while maintaining child-resistance, reducing material usage, and preventing dust accumulation, ensuring a balanced and effective child-resistant mechanism.
Implementation Method 1
the or each pad being supported on the sidewall by force insulating links which restrict lateral spreading of forces into the sidewall during inward deflection of the pad
Implementation Method 2
the or each pad being connected to the body wall by one or more insulating links which block inward deflection of the pad from spreading into adjacent regions of the body wall
Implementation Method 3
The pad-sidewall interface may be formed as an articulated linkage
Implementation Method 4
The pad-body interface may be formed as a floating hinge
Data Source
AI summary
A child-resistant closure includes a body with a base and a lid, the closure having a locked position in which the lid is held in a closed position and an unlocked position in which the lid is released and can be moved to an open position. The sidewall has one or more pressing pads for moving the closure to the unlocked position. The or each pad is supported on the sidewall by force insulating links which restrict lateral spreading of forces into the sidewall during inward deflection of the pad(s).