Sliding Metal Phone Case With Torsion-Spring Locking

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Solution Overview

Problem

Existing mobile phone cases made of hard materials, such as metal, face challenges in fitting around the phone due to their inability to bend or deform, leading to complex structures with movable components or insufficient connections that can cause separation and inconvenience during use.

Innovation Solution

A scalable mobile phone case using metal shells connected via a sliding mechanism with torsion springs, featuring positioning sliders and slide slots for stability, allowing easy switching between open and closed states with elastic force maintenance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If hard materials such as metal are used for mobile phone cases, then impact and abrasion resistance is improved, but the case cannot bend or deform to fit around the phone

Engineering Contradiction:
Improveimpact and abrasion resistanceVSAvoidability to bend and deform
Core Design Contradiction:
StrengthVSAdaptability or versatility

Solution Approach 1:

The mobile phone case is divided into an upper shell and a lower shell that can slide relative to each other. This segmentation allows the hard metal material to maintain its protective strength while the segmented structure provides the necessary flexibility to adapt to the phone's shape and enable easy installation and removal.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The case incorporates a sliding mechanism with torsion springs that enables dynamic movement between the upper and lower shells. The springs provide elastic force to facilitate smooth sliding motion, allowing the case to transition between closed and open states while maintaining structural integrity and protective capabilities.

Inventive Principle:
Principle #15Dynamics

2Adaptability or versatility

If a movable component is added to hard material cases to enable opening, then adaptability is improved, but the structure becomes complex and connection strength decreases

Engineering Contradiction:
Improveability to open and closeVSAvoidstructure complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The case uses a sliding mechanism with torsion springs instead of complex hinges or latches. The springs provide elastic force to facilitate smooth sliding motion between the upper and lower shells, enabling easy opening and closing while maintaining a relatively simple and robust structure with strong connection.

Inventive Principle:
Principle #15Dynamics

3Ease of operation

If a sliding mechanism with elastic force is used, then ease of operation is improved, but device complexity increases

Engineering Contradiction:
Improveease of switching between statesVSAvoidmechanism complexity
Core Design Contradiction:
Ease of operationVSDevice complexity

Solution Approach 1:

The sliding mechanism incorporates torsion springs that provide elastic force to assist the sliding motion between the upper and lower shells. This dynamic element enables easy opening and closing operations while maintaining a relatively simple structural design, as the springs naturally facilitate the movement without requiring complex actuation mechanisms.

Inventive Principle:
Principle #15Dynamics

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

Provides strong impact and abrasion resistance, ensures stable connection, and facilitates easy operation with automatic state transitions, enhancing protection and usability.

Implementation Method 1

A torsion spring is installed between the upper and lower connecting portions, providing elastic force to keep the upper and lower shells stable in either an open or closed state

Methodology Applied
Scientific EffectElastic force: Elasticity

Data Source

PatentUS20260067387A1Scalable Mobile Phone Case
Publication Date: 2026.03.05 MA XIJIAN
  • US20260067387A1 patent drawing
  • US20260067387A1 patent drawing
  • US20260067387A1 patent drawing

AI summary

A scalable mobile phone case, comprising: an upper shell and a lower shell, wherein the upper shell and lower shell combine to form a cavity capable of holding a mobile phone. The upper shell has an upper connecting portion, and the lower shell has a lower connecting portion that interfaces with the upper connecting portion. The upper and lower connecting portions are connected via a sliding mechanism, enabling reciprocating sliding along the longitudinal axis of the mobile phone case. A torsion spring is positioned between the upper and lower connecting portions. Through the interaction between the upper and lower connecting portions, the upper and lower shells can slide relative to each other, allowing the case to switch between a separated state and a closed state. The elastic force of the torsion spring ensures that the upper and lower shells remain stable in either the separated or closed state.