Double-Sealed Lip Cosmetic Case with Rising Piston and Sealing Ring
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Solution Overview
Problem
Conventional lipstick cosmetic containers suffer from poor sealing capabilities, allowing external air to enter and causing the cosmetic product to deteriorate or harden due to weak couplings between the over-cap, case, lipstick holder, and protection tube.
Innovation Solution
An airtight lip cosmetic case design featuring a rising piston with a sealing ring and a sealing piston with a sealing blade, both made of soft synthetic resin, which come into tight contact with the inner circumference of the upper case, providing double sealing and preventing external air from entering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional lipstick cosmetic container structure is used with weak coupling between components, then ease of manufacture is improved, but sealing capability deteriorates allowing external air to enter
Solution Approach 1:
The invention divides the sealing function into multiple independent sealing elements: a sealing ring on the protection tube and a sealing blade on the cosmetic holder. This segmentation allows each sealing element to be designed and manufactured separately, maintaining ease of manufacture while achieving reliable double sealing to prevent air entry.
Solution Approach 2:
The invention introduces intermediate sealing structures (sealing ring and sealing blade) that act as mediators between the protection tube, cosmetic holder, and fastening cap. These intermediary sealing elements create additional barriers against air entry, improving sealing capability without fundamentally changing the basic container structure.
2Reliability
If multiple sealing structures are added to improve sealing capability, then sealing capability is improved, but device complexity increases
Solution Approach 1:
The invention applies sealing structures only at specific critical locations where air entry is most likely to occur: the protection tube inlet and the interface between the cosmetic holder and fastening cap. This localized approach provides effective sealing without adding complex structures throughout the entire device, thereby limiting the increase in device complexity.
Solution Approach 2:
The sealing ring and sealing blade are designed as flexible, thin sealing elements that can easily conform to the mating surfaces they seal against. This flexibility allows effective sealing with simple, thin structures rather than requiring complex rigid sealing mechanisms, thus improving sealing capability while minimizing the increase in device complexity.
Data Source
AI summary
The present invention relates to an airtight lip cosmetic case of which the inside is doubly sealed, comprising: a lower case; an upper case which is rotatably coupled to the top of the lower case and has a sealing shoulder formed on the outside thereof; a rising piston which rises within the upper case and has a lip cosmetic product attached to the upper side thereof; a sealing piston which is fixed and coupled to the outside of the rising piston; and an over-cap which is detachable from the lower case, wherein the airtight lip cosmetic case further comprises a sealing ring formed on the outer circumference of the rising piston such that the sealing ring rises in a state of being in close contact with the inner circumference of the upper case, and a sealing blade formed on the outer circumference of the sealing piston.