Pump Lid Engagement Structure to Prevent Cosmetic Container Leakage
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Solution Overview
Problem
Conventional lotion containers with pump caps experience unintentional leakage due to the pump cap and discharger rotating together, and the nontransparent design makes it difficult to determine the correct opening method, leading to frequent unintended lid opening issues.
Innovation Solution
A lotion container with a lid featuring a pump body and a nontransparent lid member, where the pump body has a cylindrical outer side wall with a spherical engaging protrusion, and the lid member has circumferential and generatrix direction ribs, allowing the lid to be lifted without rotating and preventing the pump body from rotating during opening, ensuring secure closure and easy operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the pump cap is made nontransparent to enhance light shielding property, then the lotion deterioration is prevented, but the fitting state cannot be checked from the exterior
Solution Approach 1:
The patent applies transparency differentiation to resolve the contradiction. The pump cap is made nontransparent for light shielding, while the lid member is made transparent or translucent. This allows users to visually check the fitting state between the pump cap and discharger through the transparent lid member, while the nontransparent pump cap continues to provide adequate light shielding protection for the lotion.
2Ease of operation
If the pump cap is configured to detachably fit on the discharger, then the appearance is more attractive, but the pump cap and discharger rotate together causing unintentional leakage
Solution Approach 1:
The patent segments the rotational function from the detachable fitting function. The pump cap maintains detachable fitting capability for easy operation, while the lid member incorporates a specific rotational structure with a rotation prevention protrusion that engages with the discharger. This prevents the pump cap and discharger from rotating together, eliminating unintentional leakage while preserving the attractive appearance of detachable fitting.
Solution Approach 2:
The patent introduces a rotation prevention protrusion as an intermediary element between the lid member and discharger. This protrusion engages with a corresponding groove on the discharger, acting as a mechanical intermediary that prevents rotational movement while allowing the pump cap to be easily attached and detached. The intermediary structure resolves the contradiction by enabling easy operation without compromising threaded engagement stability.
3Ease of operation
If the lid member is rotated to open the lid, then the lid can be opened, but the pump body rotates together causing leakage
Solution Approach 1:
The patent inverts the traditional lid opening mechanism. Instead of the lid member rotating directly to open, the lid member is designed to be lifted upward for opening. The rotation function is inverted and assigned to a specific rotation prevention protrusion that rotates in a controlled manner while engaged with the discharger groove. This inversion allows the lid to open without the pump body rotating, preventing leakage while maintaining ease of operation.
Data Source
AI summary
A lotion container has a lid such that a lid member reliably fits on a pump body and is held thereon when the lid is closed. The lid member is easily opened by lifting the lid relative to a container body during a lid opening operation, and the pump body and the lid member are prevented from rotating together even when the lid member is rotated relative to the container body. The pump body is provided with a cylindrical outer side wall surface having a spherical engaging protrusion configured to engage the lid member. The lid member is provided, at a cylindrical inner side wall surface, with a line of circumferential rib configured to intermittently extend along an inner circumference of the lid member and to engage with the engaging protrusion of the pump body and a generatrix direction rib provided with a raising part.