Sealed Lipstick Case Spring-Loaded Inner Cap Air Infiltration

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Solution Overview

Problem

Existing lipstick containers fail to maintain a tight seal, allowing outside air to enter and potentially contaminate or deteriorate the cosmetic due to the degradation of elastic sealing members and misalignment issues with close-contact grooves.

Innovation Solution

A sealed lipstick case design featuring an inner cap moved up and down by a spring's elastic force, with a sealing mechanism that includes an inner hook and flexible fastening ends to ensure tight coupling between the upper and lower caps, preventing air infiltration and cosmetic degradation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a sealing member made of rubber or silicon is used to seal the lipstick container, then the sealing function is initially good, but the elastic force deteriorates during long use and sealing force decreases

Engineering Contradiction:

Improvesealing forceVSAvoidservice life of sealing member

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent changes the material parameter from elastic materials (rubber/silicon) to a non-elastic resin material for the sealing member. This parameter change eliminates the degradation of elastic force over time while maintaining effective sealing, thereby resolving the contradiction between initial sealing performance and long-term durability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a disposable sealing member made of resin that does not rely on elastic recovery. The sealing member is designed to be replaced rather than reused, eliminating the problem of elastic force deterioration and ensuring consistent sealing performance throughout the product's service life.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If a close-contact groove with inner and outer slopes is formed on the sealing member to seal the protection tube, then sealing is improved, but misalignment occurs when the groove is misplaced and close contact is not achieved

Engineering Contradiction:

Improvesealing effectivenessVSAvoidalignment accuracy

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent removes the close-contact groove structure from the sealing member entirely. Instead, it uses a separate resin member with a protrusion that fits into a corresponding groove on the protection tube. This extraction of the problematic groove design eliminates misalignment issues while maintaining sealing effectiveness through a different mechanical interface.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The sealing system is segmented into distinct functional components: the sealing member with a protrusion and the protection tube with a groove. This segmentation allows each component to be optimized independently, ensuring proper alignment and reliable sealing without the misalignment problems of integrated groove designs.

Inventive Principle:

Principle #1Segmentation

3Ease of operation

If the lid is forcibly fitted to open and close the case, then the opening/closing operation is efficient, but outside air is introduced to the container during storage

Engineering Contradiction:

Improveopening/closing efficiencyVSAvoidair infiltration

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent implements a nested sealing structure where the sealing member is positioned inside the lid, and the resin member with protrusion is inserted into the protection tube. This nested arrangement creates multiple sealing layers that prevent air infiltration during storage while maintaining easy opening and closing operation through the lid's forced fit mechanism.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The resin member acts as an intermediary sealing element between the lid and the protection tube. It provides the actual air-tight seal while the lid's forced fit mechanism handles the opening/closing operation, thereby mediating between operational efficiency and protection against air infiltration.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 design effectively blocks outside air, prevents contamination, and maintains a stable seal by utilizing the spring's elastic force for close contact between the inner cap and main body, ensuring the lipstick remains fresh and usable.

Implementation Method 1

an inner cap moved up and down by the elastic force of a spring

Methodology Applied

Scientific EffectElastic force: Elasticity

Data Source

PatentUS11700932B2Sealed lipstick case

Publication Date: 2023.07.18 JEONG HUN CO LTD

AI summary

A sealed lipstick case comprises a lipstick lift part (10), a lower main body (20), and an upper cap (30). The upper cap has an inner cap provided thereinside being in close contact with an upper part of the lower main body by a spring elastic force, and an inner hook for preventing the inner cap from being separated.