Packaging Container Twist-Off Cap Locking Mechanism
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Solution Overview
Problem
Conventional twist-type caps for packaging containers require excessive turning force for opening due to insufficient retaining power, limiting the design freedom of container shapes to flat forms.
Innovation Solution
A container body with axial drive ribs and a cap featuring protruding rib portions that elastically deform to release locking claws from a locking groove, reducing the required turning force and allowing smooth removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If locking claws are used to lock into the locking portion on the mouth side, then the cap can be securely attached to close the mouth, but the required turning force for opening becomes excessively large
Solution Approach 1:
The locking mechanism is divided into multiple locking claws (typically 3-6) distributed around the circumference of the cap. Each locking claw independently engages with the locking groove, distributing the total locking force and reducing the turning force required for each individual claw to release, thereby solving the contradiction between secure locking and easy opening.
Solution Approach 2:
The locking claws are designed with elastic deformation capability, allowing them to dynamically adjust during the opening process. When the cap is rotated in the opening direction, the locking claws elastically deform and gradually disengage from the locking groove, transforming the static locking force into a dynamic release process that reduces peak turning force while maintaining reliable retention during closure.
2Ease of operation
If the cap and container body are designed with flat shapes for twist-type opening, then the opening mechanism works, but the degree of freedom in design is limited
Solution Approach 1:
The locking claw and locking groove mechanism is designed as a universal system that can be applied to various container and cap shapes beyond flat designs. The radial engagement of locking claws with the circumferential locking groove allows the same opening mechanism to work with cylindrical, conical, or irregular container geometries, providing multi-functionality and design freedom while maintaining ease of operation.
Solution Approach 2:
The cap and container body can be made from various materials (plastic, metal, composite materials) with different mechanical properties while maintaining the same locking mechanism. The elastic deformation capability of locking claws accommodates different material characteristics, allowing designers to choose materials based on other requirements (strength, weight, cost) without being constrained by the opening mechanism, thus enhancing design freedom.
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 enables easier opening and removal of the cap by reducing the turning force needed, allowing for more versatile container and cap shapes beyond flat designs.
Implementation Method 1
each of locking claws elastically deform radially via the drive ribs and the protruding rib portions to come off the locking groove
Data Source
Figure 1(A)~1(B)
Figure 2(A)~2(C)
Figure 3(A)~3(B)
AI summary
An object of the present invention is to provide a packaging container to improve the degree of freedom in the shapes of a container body and a cap, and prevent required turning force from being excessively large. The packaging container of the present invention includes a container body (10) having an upward-facing mouth (12), and a cap (20) for closing the mouth (12). The container body (10) has a plurality of axial drive ribs (15, 15, ...) and a circumferential locking groove (14) formed on an outer perimeter of the mouth (12). The cap (20) has protruding rib portions (24) on an inner surface side and locking claws (23, 23, ...) to elastically lock into the locking groove (14), extended down from a top surface thereof.