Child-Resistant Cap With Segmented Inner And Outer Locking Mechanism
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Solution Overview
Problem
Existing container caps are either easily openable by children, posing a hazard, or difficult for senior citizens to operate, and lack a balance between being child-resistant and senior-friendly.
Innovation Solution
A child-resistant cap design featuring an outer cap with knurled side walls and semi-cylindrical projections, and an inner cap with ribs and undercuts, along with a wedge-shaped structure and tapered surfaces, which creates an interlock mechanism that is easy to operate for senior citizens while preventing accidental opening by children.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is added to make the cap child-resistant, then safety against children is improved, but ease of operation deteriorates for senior citizens
Solution Approach 1:
The cap is divided into two separate caps: an outer cap that remains on the container and an inner cap that contains the hazardous material. The inner cap can be easily removed by senior citizens without complex mechanisms, while the outer cap provides the child-resistant locking feature. This segmentation allows each cap to fulfill its specific function independently, resolving the contradiction between child resistance and ease of operation.
Solution Approach 2:
The inner cap acts as an intermediary element between the user and the hazardous material. It can be easily removed by senior citizens to access the material, while the outer cap with its locking mechanism remains as a protective barrier against children. The inner cap mediates between the need for easy access and child safety, allowing senior citizens to operate it easily while children cannot access the outer cap's locking mechanism.
2Reliability
If a complex locking mechanism is used to prevent children from opening, then child safety is improved, but device complexity increases
Solution Approach 1:
By dividing the cap system into outer and inner caps with different functions, the complexity of the locking mechanism is isolated to the outer cap only. The inner cap remains simple and easy to operate, reducing the overall device complexity while maintaining child resistance through the outer cap's locking mechanism.
3Ease of operation
If an easy-to-open cap is used for senior citizens, then ease of operation is improved, but child safety deteriorates
Solution Approach 1:
The hazardous material containment is segmented into two layers: the inner cap that provides easy access for senior citizens and the outer cap that provides child safety. The inner cap's simplicity enables easy operation for senior citizens, while the outer cap's locking mechanism prevents children from accessing the material, thus resolving the contradiction between ease of operation and hazard prevention.
Solution Approach 2:
The inner cap serves as an intermediary that allows easy access for senior citizens while the outer cap acts as a protective intermediary barrier against children. This dual-cap intermediary system enables senior citizens to easily remove the inner cap for access while children cannot penetrate the outer cap's locking mechanism, thereby preventing hazardous exposure to children while maintaining ease of operation for seniors.
Data Source
AI summary
A child-resistant cap for containers is provided. The child-resistant cap includes an outer cap and an inner cap. The outer cap is configured with a knurled side wall and includes a plurality of inner projections and a plurality of involute teeth projected on an inner top surface. The inner cap is configured to fit into the outer cap and includes an inner side wall which includes a plurality of ribs positioned on the outer side. The space between the adjacent ribs of the plurality of ribs includes an inclined structure and a plurality of undercuts. An outer top surface of the inner cap includes a plurality of projections with a wedge-shaped structure which is configured to mesh with the plurality of involute teeth. The wedge-shaped structure includes a chamfered edge. A bottom surface of the inner cap is configured as a tapered surface.