Child-Resistant Cap Spacer Bending Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional child-resistant containers are often difficult for adults to open while being insufficiently secure against children, as they can be easily opened by young children due to their complex designs.
Innovation Solution
A cap and container assembly featuring a spacer that bends inward when sufficient force is applied, exposing the tab for easy adult access while remaining inaccessible to children, combined with a hinge and thumb tab for efficient opening and closing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional push-and-turn or arrow-alignment closures are used, then child-resistant security is improved, but adult ease of operation deteriorates
Solution Approach 1:
The closure system is divided into separate functional components: a cap with thumb tab, a container with opening, and a spacer element. This segmentation allows each component to perform its specific function independently, simplifying the overall operation for adults while maintaining child-resistant security through the coordinated interaction of these segments.
Solution Approach 2:
The spacer element is extracted as a separate component that can be removed or displaced during the opening process. This extraction allows the tab to be pulled out from its blocked position, enabling the cap to be opened easily by adults while the spacer remains as part of the child-resistant mechanism.
2Ease of operation
If conventional fixed protrusion thumb tabs are used, then adult ease of operation is improved, but child-resistant security deteriorates
Solution Approach 1:
The spacer element transitions from a static blocked position to a dynamic displaced position during opening. This dynamic behavior allows the system to adapt between two states: blocked to prevent child access, and displaced to enable adult opening, resolving the contradiction between security and ease of operation.
Solution Approach 2:
The position parameter of the spacer element changes from a blocked position (protruding to block tab access) to an unblocked position (retracted or displaced). This parameter change enables the system to switch between child-resistant and adult-accessible states, maintaining both security and ease of operation.
3Reliability
If complex closure mechanisms are used, then child-resistant security is improved, but device complexity increases
Solution Approach 1:
The child-resistant and opening functions are merged into a single integrated mechanism where the spacer element serves both purposes: it blocks the tab to prevent child access and can be displaced to enable adult opening. This merging eliminates the need for separate complex mechanisms, reducing overall device complexity while maintaining security.
4Device complexity
If simple fixed tab designs are used, then device complexity is reduced, but child-resistant security deteriorates
Solution Approach 1:
The spacer element acts as an intermediary component between the tab and the cap. It mediates the interaction by blocking the tab in the closed state (preventing child access) and can be displaced during opening (enabling adult access). This intermediary element adds minimal complexity while significantly improving child-resistant security.
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 design effectively balances child-resistant security with adult ease of use, achieving a high success rate in both child-resistant effectiveness and senior-use effectiveness, as demonstrated by testing, while maintaining compliance with poison prevention packaging standards.
Implementation Method 1
The spacer bends inward towards the container in response to application of a sufficient force
Data Source
AI summary
A cap and container assembly includes a container having a base and a side wall extending upward from the base. The base and the side wall define an interior, and the side wall defines an opening leading to the interior. A cap moves with respect to the container between an opened position in which the opening is exposed, and a closed position in which the cap covers the opening. A tab projects outward from the cap and has a bottom surface. A spacer projects from the container side wall at a location beneath the tab when the assembly is in the closed position. The spacer bends inward towards the container in response to application of a sufficient force, to move from a locked position that blocks the bottom surface of the tab, to an unlocked position to expose at least a portion of the bottom surface of the tab.