Double-Layer Phone Case Sealing Structure for Repeated Assembly

Solution Overview

Problem

Existing single-layer waterproof phone cases suffer from sealing ring loosening after repeated disassembly, compromising their waterproof performance.

Innovation Solution

A double-layer waterproof structure featuring double-layer protrusions on the sealing ring and corresponding recesses in the case components, enhancing friction and sealing area to prevent loosening and improve stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a single smooth sealing ring is used for waterproofing, then the waterproof function is initially effective, but the sealing ring is easy to loosen after repeated disassembly and assembly

Engineering Contradiction:

Improvewaterproof functionVSAvoidsealing ring stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The sealing ring is segmented with protrusions that divide the continuous sealing surface into multiple sections. These protrusions engage with corresponding recesses in the case components, creating discrete locking points that prevent the sealing ring from rotating or loosening during repeated assembly and disassembly operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sealing ring has non-uniform local properties with protrusions at specific locations that provide enhanced gripping and locking functionality. These localized features create higher friction and mechanical interlocking at critical points while maintaining a smooth sealing surface in other areas for effective waterproofing.

Inventive Principle:

Principle #3Local quality

2Reliability

If the sealing ring is made smoother for better sealing, then the sealing performance improves, but the friction between the sealing ring and case components decreases, leading to easier loosening

Engineering Contradiction:

Improvesealing performanceVSAvoidfriction force

Core Design Contradiction:

ReliabilityVSForce

Solution Approach 1:

The sealing ring is segmented with protrusions that divide the continuous sealing surface into multiple sections. These protrusions engage with corresponding recesses in the case components, creating discrete locking points that prevent the sealing ring from rotating or loosening during repeated assembly and disassembly operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sealing ring has non-uniform local properties with protrusions at specific locations that provide enhanced gripping and locking functionality. These localized features create higher friction and mechanical interlocking at critical points while maintaining a smooth sealing surface in other areas for effective waterproofing.

Inventive Principle:

Principle #3Local quality

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 double-layer design increases friction and sealing effectiveness, reducing production defects and user-induced loosening, ensuring reliable waterproofing even after multiple assemblies and disassemblies.

Implementation Method 1

the sealing ring will be squeezed and deformed to a greater extent after the bottom case and the face case are snapped together, and a friction between the sealing ring and the bottom of the first slot will also increase

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

the sealing ring will be squeezed and deformed to a greater extent after the bottom case and the face case are snapped together

Methodology Applied

Scientific EffectDeformation: Deformation

Data Source

PatentUS20250373277A1Novel double-layer waterproof structure for phone cases

Publication Date: 2025.12.04 WU ZHIWEI

AI summary

A double-layer waterproof structure for phone cases is disclosed, including a bottom case, a face case, and a sealing ring. A first slot is provided on a top of the bottom case, a first recess is provided on a bottom of the face case, and the sealing ring is fixed in the first recess. The bottom of the face case is snapped into the first slot, a bottom of the sealing ring is against a bottom of the first slot, and the bottom of the sealing ring is provided with double-layer protrusions. Through designing of the double-layer protrusions, the sealing ring will be squeezed and deformed to a greater extent after the bottom case and the face case are snapped together, to avoid the sealing ring from being loosened after the phone case is repeated disassembly and assembly, thus preventing water leakage due to poor sealing.