Applicator Flange Engagement via Outer Step Inversion
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Solution Overview
Problem
Existing applicators face issues with attachment failure of brush-like applying bodies due to parts getting stuck inside the front barrel during assembly, leading to defects and reduced manufacturability.
Innovation Solution
The design features a barrel cylinder with a tapered inner surface for non-surface contact engagement of the flange portion of the applying body, along with a stirring piece that enhances liquid distribution and prevents the applying body from being caught inside, ensuring reliable attachment and improved manufacturability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brush-like applying body is inserted from the rear side of the front barrel with a large-diametric flange engaged with the inner peripheral surface, then the applying body is prevented from coming off, but part of the hair bundle tips are caught by the engagement step and looped back inside the front barrel causing attachment failure
Solution Approach 1:
The patent inverts the engagement mechanism by placing the engagement step on the outer peripheral surface of the front barrel instead of the inner peripheral surface. The receiving part of the flange portion engages with this outer engagement step, reversing the traditional engagement direction and eliminating the problem of hair bundle tips being caught during insertion.
Solution Approach 2:
The patent transitions from a surface contact engagement mode to a point contact engagement mode. The receiving part of the flange portion makes point contact with the engagement step on the outer peripheral surface, rather than surface contact with the inner peripheral surface, changing the dimensional nature of the engagement interface.
2Ease of manufacture
If the receiving part of the flange portion and the inner face of the front barrel are in contact in a non-surface contact manner, then attachment is improved, but the contact area is reduced potentially affecting stability
Solution Approach 1:
The patent inverts the engagement location from the inner face of the front barrel to the outer peripheral surface of the front barrel. This inversion maintains the non-surface contact (point contact) advantage for ease of manufacture while achieving reliable attachment through the outer engagement step that prevents applying body detachment.
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(c)
Figure 3(a)~3(g)
AI summary
The present invention to provide an applicator which can solve the problems such as attachment failure of an applying body of a brush due to part of the brush stuck remaining inside the front barrel when the brush-formed applying body is attached to the front barrel to thereby reliably attach the brush-formed applying body to the front barrel. The applicator includes: a rear barrel 20 storing an application liquid in a storage portion 21 inside a barrel cylinder; a front barrel 10 provided on the front end side of the rear barrel 20; and an applying body 40, formed of a brush with a flange portion 41 at its rear end, and arranged inside the front barrel 10 so as to supply the application liquid to the applying body 40 from the storage portion 21 inside the rear barrel 20, and is characterized in that a receiving part 42 of the flange portion 41 of the applying body 40 and the inner face of the front barrel 10 are in contact with each other in a non-surface contact manner.