Screwable Cover Connection System with Interlocking Teeth
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Solution Overview
Problem
Existing screwable cover systems for containers with viscous fluids often experience detachment between the external shell and the counter-cover when unscrewed, due to gluing of the sealing cone to the bottle neck, preventing correct opening.
Innovation Solution
A connection system featuring radially arranged engaging teeth with a sawteeth profile and interference-type connecting means, such as ribs and grooves, to securely attach the counter-cover to the external shell, preventing detachment during unscrewing even if the sealing cone glues to the bottle neck.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing cone is glued onto the bottle neck to ensure sealing, then the sealing effect is improved, but the detachment between the external shell and counter-cover occurs when unscrewing
Solution Approach 1:
The connection system is divided into distinct functional elements: the first engaging teeth on the counter-cover, the second engaging teeth on the external shell, and the interference-type connecting means (rib and groove). This segmentation allows the sealing function and mechanical connection function to be separated, so that gluing the sealing cone does not compromise the mechanical connection between shell and counter-cover.
Solution Approach 2:
The connection system combines multiple connection mechanisms (engaging teeth with sawteeth profile and interference-type connecting means) to create a composite connection structure. This composite approach ensures that even if one connection mechanism (gluing) fails due to unscrewing forces, the other mechanisms (mechanical interlocking) maintain the connection integrity.
2Ease of manufacture
If the brush is connected to the external shell by screwing or snap-type hook, then the connection is established, but the sealing cone still gets glued and detaches the brush when unscrewing
Solution Approach 1:
The engaging teeth with sawteeth profile are pre-configured on the counter-cover and external shell before assembly. This preliminary arrangement of interlocking features ensures that the mechanical connection is established first, creating a predetermined path that prevents detachment even when gluing occurs during the unscrewing process.
Solution Approach 2:
The interference-type connecting means (rib and groove) act as an intermediary mechanical lock between the counter-cover and external shell. This intermediary structure mediates the forces during unscrewing, preventing the transmission of detachment forces to the brush connection, thereby protecting the brush from accidental detachment.
3Stability of the object's composition
If the engaging teeth have a sawteeth profile with slanted side oriented opposite to unscrewing direction, then detachment is prevented, but the device complexity increases
Solution Approach 1:
The sawteeth profile is applied locally only to the engaging teeth that interface between the counter-cover and external shell, rather than throughout the entire connection system. This localized application provides the necessary anti-detachment functionality only where needed, minimizing the overall complexity increase while achieving the stability goal.
Data Source
Figure 1a~2
AI summary
A connection system for screwable covers is described, comprising at least one screwable cover (1) for closing a bottle containing a fluid product, such cover (1) being composed of at least one counter- cover (3) and at least one external shell (5), such counter-cover being adapted to be connected to such shell (5), such counter-cover (3) being equipped, on its perimeter and externally, with a plurality of first radially arranged engaging teeth (9) and such external shell (5) being equipped with at least one seat (11) for inserting such counter- cover (3).