Child Resistant Cap Lever Lock Mechanism
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Solution Overview
Problem
Existing child-resistant caps do not adequately prevent children from accessing contents while maintaining ease of use for adults, as they often require significant strength or complex combinations to open.
Innovation Solution
A child-resistant cap with a safety ring and ring gap lock featuring a lever mechanism, where the lever is connected to a flexible arcuate band, allowing the cap to be unlocked and lifted when properly aligned, requiring two distinct steps for removal: alignment and lever activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple cap design is used, then ease of operation is improved, but child safety is worsened
Solution Approach 1:
The cap is divided into multiple functional components: an outer ring unit with ledge and cut out gap, a movable ring gap lock, and a lever. These segmented parts work together to provide both child resistance and ease of opening for adults through distinct operational steps.
Solution Approach 2:
The lever must be pushed upward to move the lock from locked to release position before the cap can be removed. This preliminary action (moving the lever) must be completed first, creating a two-step process that prevents accidental opening by children while maintaining adult usability.
2Reliability
If a strong locking mechanism is used, then child safety is improved, but ease of operation is worsened
Solution Approach 1:
The lever acts as an intermediary component between the user and the lock mechanism. By pushing the lever upward, the user indirectly moves the lock to the release position, providing a simple and intuitive interface that requires minimal strength while maintaining secure locking.
Solution Approach 2:
The lock is designed to be movable between distinct positions (locked and release positions) rather than a fixed rigid structure. This dynamic design allows the lock to transition smoothly between states in response to lever actuation, making the opening process easier while maintaining security in the locked state.
3Reliability
If alignment requirements are added, then child safety is improved, but device complexity is worsened
Solution Approach 1:
The cut out gap in the outer ring unit is positioned asymmetrically relative to the lever's movement path. This asymmetric arrangement creates a natural alignment requirement where the lever can only be properly actuated when the cap is in the correct rotational position, adding a safety layer without requiring complex alignment mechanisms.
Solution Approach 2:
The alignment requirement is merged with the lever actuation mechanism itself. The same lever that moves the lock also serves as the alignment indicator, eliminating the need for separate alignment features and reducing overall device complexity while maintaining the alignment safety function.
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 effectively prevents children from removing the cap without proper alignment and lever activation, ensuring safety while allowing adults to easily access the contents with minimal strength and effort.
Implementation Method 1
the lock component has a lock, a living hinge, such as a flexible arcuate band, and a protrusion that functions as, and thus is, a lever. When an overcap is moved to the aligned ('firing') position, the lever is pushed upwardly so as to simultaneously unlock the lock and help lift the overcap off its locked position.
Data Source
AI summary
A child resistant cap includes: (a) a main closure base; (b) an outer ring unit that functions as a safety collar; (c) a dispensing mechanism on the base; (d) an overcap. The base attaches to a top dispensing container and the horizontally rotatable ring unit is attached to the base. Alternatively, the outer ring unit is fixedly attached to the container. The overcap has protrusions and the ring has at least one corresponding cut out. There is a ring cut out gap lock and lever that prevents at least one protrusion from passing through a cut out gap, unless it is moved to a release position after alignment of the ring unit and overcap and the lever is pushed upwardly to release the lock and lift the overcap.