Dual Anti-Rotation Cap Locking for Leak-Resistant Skin Care Containers
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Solution Overview
Problem
Conventional container caps for liquid skincare and cosmetic products are prone to unintentional loosening due to thread wear, material fatigue, and environmental changes, leading to inconsistent sealing and reduced reliability, especially during routine handling and transport.
Innovation Solution
A dual anti-rotation mechanism is introduced, featuring first and second anti-rotation devices arranged on concentric circular paths with convex projections, recessed notches, and elastic guiding structures to restrict rotational movement from multiple directions, enhancing sealing reliability and providing tactile feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional threaded caps are used, then sealing function is provided, but unintentional loosening occurs during handling and transport
Solution Approach 1:
The anti-rotation mechanism is divided into multiple independent components: convex projections on the cap, recessed notches on the container, and elastic guiding structures. These segmented elements work together to provide multi-directional resistance against rotation, preventing unintentional loosening while maintaining sealing reliability.
Solution Approach 2:
The convex projections and recessed notches are pre-configured in specific angular positions to counteract rotational forces before they can cause loosening. The elastic guiding structures are pre-positioned to provide immediate resistance against rotation in multiple directions, preventing the cap from detaching during handling and transport.
2Stability of the object's composition
If single anti-rotation feature is introduced, then some rotational resistance is provided, but insufficient stability remains under multi-directional forces
Solution Approach 1:
The locking mechanism is segmented into multiple anti-rotation features arranged at different angular positions around the cap-container interface. Each feature (convex projection, recessed notch, elastic guiding structure) operates independently to resist rotation from specific directions, providing comprehensive stability without requiring a single complex locking system.
Solution Approach 2:
The anti-rotation mechanism extends from a single-point solution to a multi-dimensional arrangement. Convex projections and recessed notches are positioned at multiple angular locations around the circumference, creating a distributed locking system that resists rotation from all directions simultaneously, thereby enhancing stability without proportionally increasing complexity.
3Ease of operation
If conventional snap-fit covers are used, then fast closure is achieved, but locking force is insufficient and unpredictable disengagement occurs
Solution Approach 1:
The convex projections and recessed notches are pre-positioned to engage automatically during the closure process. As the cap is placed on the container, the elastic guiding structures and anti-rotation features align and lock into place before the user completes the closing action, ensuring secure engagement from the outset while maintaining ease of operation.
Solution Approach 2:
The elastic guiding structures and anti-rotation features are designed to self-align and self-lock during closure. The convex projections automatically find their corresponding recessed notches, and the elastic structures provide self-adjusting resistance against rotation, eliminating the need for additional locking actions or complex user operations while ensuring reliable closure security.
Data Source
AI summary
The present invention relates to a cosmetic container assembly comprising a liquid storage container and a container cap equipped with an enhanced anti-rotation mechanism. The assembly is specifically configured to reduce unintended rotation, leakage, and wear that are frequently encountered in conventional threaded closures. The liquid storage container includes a connecting portion incorporating first and third anti-rotation portions, while the container cap is provided with second and fourth anti-rotation portions arranged to cooperatively engage with those of the container. The first anti-rotation portion is defined by a guide convex portion and a blocking convex portion, which together create a stepped surface with different radial heights for guiding insertion and secure locking of the second anti-rotation portion. The third anti-rotation portion includes a guide wall and blocking wall for receiving the fourth anti-rotation portion. Their cooperative engagement along concentric circles ensures improved stability, tactile feedback, and reliable sealing performance.