Cap Retaining Protrusion for Cosmetic Container Contact Strength
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The contact strength between the inner and outer lid portions of conventional cosmetic cream containers is compromised due to the metallic luster layer on the outer surface, leading to misalignment or separation issues, and existing solutions either degrade the appearance or fail to enhance contact strength effectively.
Innovation Solution
A cap design featuring a retaining protrusion with an inclined surface on the outer lid portion that engages with a corresponding depression on the inner lid portion, along with a metallic luster layer on the inner lid portion, to enhance contact strength without degrading the appearance, and an internal thread for secure attachment to the container body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a metallic luster layer is provided on the outer surface of the inner lid portion to achieve luxurious appearance, then the appearance is improved, but the contact strength between the inner lid portion and outer lid portion decreases
Solution Approach 1:
A retaining protrusion is provided on the inner peripheral surface of the outer lid portion to engage with a retaining depression on the outer peripheral surface of the inner lid portion. This mechanical interlocking structure acts as an intermediary that reinforces the contact strength between the inner and outer lid portions, preventing separation while allowing the metallic luster layer to maintain the luxurious appearance.
2Strength
If a projection and groove for fitting are provided to prevent lifting or falling of the outer lid portion, then the contact strength is improved, but the appearance design degrades due to visibility through the transparent outer lid portion
Solution Approach 1:
The retaining protrusion and depression are designed with specific geometric characteristics - the protrusion has an inclined surface that is inclined inward in the downward direction and extends to the lower end of the outer lid portion. This localized structural design provides the necessary mechanical interlocking while minimizing visual impact through the transparent outer lid portion, thus maintaining appearance quality in non-critical areas while strengthening the connection where needed.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A cap (20) configured to be detachably attached to a mouth portion (11) of a container body (10) having a containment space S for contents and close the mouth portion (11), comprises: a transparent or semitransparent topped tubular outer lid portion (30); and a topped tubular inner lid portion (40) located in close contact with an inner side of the outer lid portion (30) so as to be relatively non-rotatable. A retaining protrusion (33) having an inclined surface (34) that is inclined inward in a downward direction and extends to a lower end of the outer lid portion (30) is provided on an inner peripheral surface of the outer lid portion (30). The retaining protrusion (33) engages with a retaining depression (43) provided on an outer peripheral surface of the inner lid portion (40), to suppress separation between the outer lid portion (30) and the inner lid portion (40).