Refillable Roll-On Bottle Thread Design to Prevent Disconnection
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Solution Overview
Problem
Existing roll-on bottles are discarded entirely when the product is finished, leading to environmental harm and unnecessary waste, and often suffer from poor assembly and disconnection issues during use.
Innovation Solution
A refillable roll-on bottle design with a conemorse mechanism, where the storage portion can be replaced, featuring distinct thread angles and forces to prevent simultaneous unscrewing of the lid and storage portion, allowing easy refilling and reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the entire roll-on bottle is discarded when the product finishes, then the user acquires a completely new bottle, but this causes environmental harm and waste of reusable components
Solution Approach 1:
The bottle is divided into separable components: a reusable applicator assembly (lid with applicator ball) and a replaceable storage portion (refill cartridge). This segmentation allows the storage portion to be replaced while retaining the applicator assembly, eliminating waste of reusable components while maintaining simple design principles.
2Loss of substance
If the bottle is designed to be refillable, then component reuse is enabled, but the assembly becomes difficult to use and components may disconnect during application
Solution Approach 1:
Different thread configurations are applied to different connections: the connection between the lid and applicator assembly uses a standard thread for easy assembly/disassembly, while the connection between the storage portion and applicator assembly uses a conical thread (conemorse) that provides gradual engagement and secure locking. This local differentiation of thread qualities ensures both ease of operation and prevention of disconnection during use.
3Ease of operation
If the lid is unscrewed with sufficient force to remove it, then the lid can be opened for use, but this may simultaneously cause disconnection of the storage portion
Solution Approach 1:
The conical thread (conemorse) configuration at the storage portion connection creates a self-locking mechanism where the conical geometry distributes the unscrewing force gradually along the threaded engagement. This local structural quality difference ensures that the storage portion remains securely connected even when sufficient force is applied to remove the lid, preventing accidental disconnection during normal operation.
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3A~3C
AI summary
The present invention refers to a refillable bottle (10) comprising a lid (1) connectable to an applicator (2), and a storage portion (3) connectable to the applicator (2), wherein the connection between the lid (1), applicator (2) and storage portion (3) occurs by means of the arrangement of threads on the lid (1), in the applicator (2) and in the storage portion (3). There is further described a method for refilling a bottle (10), said bottle (10) comprising a lid (1) connectable to an applicator (2) and a storage portion (3) connectable to the applicator (2), wherein the method comprises the steps of: disconnecting the storage portion (3) from the applicator (2) and by means of a first unscrewing action, and connecting a refill (20) to the applicator (2), wherein the force required to perform the first unscrewing action is greater than the force required to perform the second unscrewing action, said second unscrewing action being understood as the action performed to disconnect the lid (1) from the applicator (2).