Child-Safe Packaging Box With Flexible Snap Lock
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Solution Overview
Problem
Existing containers are easily opened by children, posing a risk of accidental ingestion of contents such as liquids or small particles, especially when filled with corrosive substances.
Innovation Solution
A safety-lock structure for a packaging box featuring a cover body and container body with external and internal threads, recessed portions, flexible snaps, and blocking portions that require two-handed operation to open, preventing children from accessing the contents due to their limited strength and hand size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple screw cap structure is used, then the device complexity is reduced and ease of operation is improved, but the safety against child access deteriorates
Solution Approach 1:
The snap-fit mechanism provides dynamic engagement and disengagement. During closing, the snap-fit automatically engages with the container neck to lock the cap. During opening, applying sufficient force causes the snap-fit to disengage dynamically, allowing the cap to be removed. This dynamic behavior provides child safety through automatic locking while maintaining operational simplicity.
Solution Approach 2:
The snap-fit mechanism changes the engagement parameter from permanent (welding) to reversible (elastic deformation). The elastic material deforms under opening force to disengage from the container neck, then returns to its original shape to maintain the seal. This parameter change enables both child safety through secure engagement and ease of operation through reversible engagement.
2Reliability
If a snap-fit mechanism is added to improve child safety, then the reliability against child access is improved, but the ease of operation deteriorates
Solution Approach 1:
The snap-fit mechanism provides dynamic engagement and disengagement. During closing, the snap-fit automatically engages with the container neck to lock the cap. During opening, applying sufficient force causes the snap-fit to disengage dynamically, allowing the cap to be removed. This dynamic behavior provides child safety through automatic locking while maintaining operational simplicity.
Solution Approach 2:
The snap-fit mechanism performs the locking function automatically during the closing operation without requiring additional steps. When the cap is screwed onto the container, the snap-fit engages on its own to provide the safety lock. This self-service characteristic maintains ease of operation while adding child safety protection.
3Reliability
If welding is used to connect the cap to the container, then the sealing reliability is improved, but the ease of manufacture and adaptability deteriorates
Solution Approach 1:
The snap-fit mechanism changes the engagement parameter from permanent (welding) to reversible (elastic deformation). The elastic material deforms under opening force to disengage from the container neck, then returns to its original shape to maintain the seal. This parameter change enables both child safety through secure engagement and ease of operation through reversible engagement.
Solution Approach 2:
The cap assembly combines different materials with complementary properties: the cap body provides structural support and threading, while the snap-fit component provides elastic engagement. This composite structure integrates the sealing and locking functions into a single manufacturable unit, improving both manufacturing ease and adaptability while maintaining sealing reliability.
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
Effectively prevents children from opening the container by requiring simultaneous pressing and rotating actions, ensuring the contents remain secure and inaccessible, while allowing adults to easily open and close the container.
Implementation Method 1
an inner wall of each pressing portions is provided with a flexible snap
Implementation Method 2
an outer wall of the neck finish is provided with external threads, an inner wall of the cover body is provided with internal threads in thread connection with the external threads
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present application discloses a container for preventing children from opening, including a cover body and a container body having a neck finish. The neck finish is provided with external threads, and the cover body is provided with internal threads. The side wall of the cover body is provided with at least two pressing portions, and the inner wall of each pressing portion is provided with a flexible snap. The upper end surface of the container body is provided with a blocking portion corresponding to each flexible snap. When the cover body and the container body are screwed tightly, the flexible snap and the blocking portion are engaged with each other. The advantages are that when the cover body needs to be opened, it requires the container body to be held by one hand, and the pressing portions are pressed by the other hand, so that the flexible snaps and the blocking portions are separated from each other, and the cover body is rotated, so that cover body can be opened. Due to the limitations of the size of children's hands, children cannot press the two pressing portions with one hand, thus cannot open the cover body, this can prevent children from eating the contents of the container body. During the process of tightening the cover body and the container body, the blocking portion slides into and is engaged with the notch snap groove, and the cover body and the container body are stably closed.