Twin-Locking Child-Resistant Closure for Easier Adult Opening
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Solution Overview
Problem
Existing child-resistant closures are complex, difficult to manufacture, and not suitable for all types of necked bottles, while also being challenging for adults to open easily.
Innovation Solution
A child-resistant closure with twin locking mechanism, featuring angled locking ratchets and teeth on both inner and outer caps, requiring simultaneous pushing and turning for opening, with complementary ratchets and serrations for enhanced grip and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing child-resistant closures use complex locking mechanisms, then child resistance is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The closure is divided into two separate caps: an inner cap that threads onto the bottle neck and an outer cap that slips over the inner cap. Each cap has its own locking features (locking teeth on the inner cap, locking ratchets on the outer cap), allowing the locking function to be distributed across separate components rather than integrated into a single complex mechanism.
Solution Approach 2:
The outer cap is designed to slip over and enclose the inner cap, creating a nested structure where the outer cap contains the inner cap. This nesting arrangement allows both caps to function independently while working together to provide the child-resistant locking feature, simplifying the overall structure compared to a single integrated mechanism.
2Reliability
If existing child-resistant closures are designed for security, then child access is prevented, but ease of operation for adults deteriorates
Solution Approach 1:
The outer cap is designed to be movable relative to the inner cap, allowing it to slip off easily when needed. The dynamic relationship between the two caps enables the closure to transition between a locked state (when the outer cap is in place) and an open state (when the outer cap is removed), providing both security and ease of operation.
Solution Approach 2:
The outer cap can be completely removed from the inner cap, separating the locking mechanism into two independent components. This extraction allows adults to easily open the closure by simply pulling the outer cap off, without needing to manipulate complex locking mechanisms, while still maintaining child resistance when assembled.
3Reliability
If existing closures are designed with specific locking mechanisms, then security is improved, but adaptability to different bottle neck sizes deteriorates
Solution Approach 1:
The inner cap is designed with a standard threading pattern that can accommodate different bottle neck sizes, while the outer cap provides universal locking functionality through its locking ratchets that engage with the locking teeth on the inner cap. This universal design allows the same closure assembly to fit various bottle types.
Solution Approach 2:
The closure design allows for parameter adjustments in the threading dimensions of the inner cap to match different bottle neck specifications, while maintaining the same outer cap and locking mechanism. This parameter flexibility enables the closure to adapt to different bottle sizes without changing the fundamental locking security.
4Reliability
If existing child-resistant closures use multiple components, then child resistance is improved, but ease of manufacture and assembly deteriorates
Solution Approach 1:
The inner cap is pre-formed with integrated locking teeth as part of its structure, and the outer cap is pre-formed with integrated locking ratchets. These preliminary incorporated features eliminate the need for separate assembly steps to attach locking components, simplifying the manufacturing process while maintaining child-resistant performance.
Data Source
AI summary
A child resistant closure with twin locking comprising a container including a body portion defining a chamber, and a hollow neck extending from the body portion, an inner cap (2) formed to fit around the hollow neck of the container, an outer cap (1) operably disposed over the inner cap (2) adapted to impart an axial rotational force on the inner cap, plurality of locking ratchet (C) positioned on the circumferential inner sidewall surface (D) of the outer cap (1) and on the circumferential outer sidewall surface (02) of the inner cap (2), plurality of locking teeth (E) positioned on the inner top surface (10) of the outer cap (1) and on the top surface (9) of the inner cap (2) wherein by pressing the outer cap (1) downward on the inner cap (2), the plurality of locking ratchet (C) positioned on the circumferential inner sidewall surface (D) of the outer cap (1) and the plurality of locking ratchets (04) positioned on the circumferential outer sidewall surface (02) of the inner cap (2) gets engaged with each other to impart rotation to the inner cap (2) in anticlockwise direction to remove the closure from the container. Further, it also discloses the use plurality of locking teeth to provide additional force to remove the closure from the container.