Beauty Device Waterproofing via Segmented Lid and Water Stop
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Solution Overview
Problem
Conventional beauty devices experience deteriorated waterproof performance due to unbalanced forces applied during use, which compromise the sealing of the O-ring between the handle and handle cover.
Innovation Solution
The beauty device incorporates a housing portion with an inner lid and a water stop portion that contacts the peripheral edge of the housing opening in a fluid-tight manner, along with an outer lid that covers the inner lid, to suppress the holding force applied to the inner lid and maintain waterproof performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the handle cover is fixed to the handle body via an O-ring to seal the recess portion, then waterproof performance is achieved, but unbalanced load during use deteriorates the waterproof performance
Solution Approach 1:
The handle is divided into separate components: handle body, inner lid, and outer lid. The inner lid seals the housing portion with the water stop portion, while the outer lid covers the opening. This segmentation allows the sealing function to be isolated from the holding function, preventing unbalanced loads during grasping from affecting the O-ring seal between the inner lid and handle body.
Solution Approach 2:
The water stop portion acts as an intermediary element between the inner lid and the housing portion. It contacts the peripheral edge of the opening in a fluid-tight manner and is intervened between the housing portion and the inner lid, suppressing the transmission of holding forces to the sealing interface.
2Reliability
If the inner lid is mounted to seal the housing portion, then waterproof performance is improved, but holding force applied during use directly affects the inner lid and compromises sealing
Solution Approach 1:
The handle structure is segmented into the inner lid that performs sealing and the outer lid that provides the gripping surface. Users grasp the outer lid, which has a larger surface area and is optimized for comfort, while the inner lid remains isolated from direct user forces, maintaining its sealing function against the housing portion.
Solution Approach 2:
The water stop portion serves as a mediator that protects the inner lid from holding forces. By being intervened between the housing portion and the inner lid and contacting the peripheral edge in a fluid-tight manner, it prevents the transmission of unbalanced loads from the outer lid to the sealing interface.
3Shape
If the outer lid covers the inner lid, then aesthetic appearance is improved, but device complexity increases
Solution Approach 1:
The outer lid is fitted into the housing portion in a state where it covers the inner lid, creating a nested structure. The outer circumference surface of the outer lid faces the inner circumference surface of the opening, with a part visible from the outside. This nesting provides aesthetic appearance while the modular design keeps assembly and disassembly straightforward.
Solution Approach 2:
The outer lid serves multiple functions: it provides aesthetic appearance by covering the inner lid, offers a gripping surface for users, and protects the inner lid from direct forces. The inner lid simultaneously provides sealing through the water stop portion. This multi-functionality reduces the need for additional components.
Data Source
AI summary
A beauty device includes a handle, an inner lid, a pair of support shafts, a pair of rotation bodies, a water stop portion, and an outer lid. The handle is formed with a housing portion. The inner lid is mounted to the handle to seal the housing portion. The pair of support shafts is extended from one end of the handle. The pair of rotation bodies is rotatably supported around the support shafts. The water stop portion is intervened between the housing portion and the inner lid to contact with a peripheral edge of an opening of the housing portion. The outer lid closes the opening while covering the inner lid such that the outer lid is fitted in the housing portion in a state where a part of an outer circumference surface of the outer lid facing an inner circumference surface of the opening is visible from an outside.