Magnetic Locking Mechanism for Mobile Device Assembly
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Solution Overview
Problem
Mobile device construction using screws and adhesives often results in damage during rework, as adhesives require heat or chemicals for separation and screws can strip threads, making post-assembly customization difficult and costly.
Innovation Solution
A latching rod attachment system with a resilient gasket and magnetic locking mechanism that interlocks without adhesives or screws, allowing for easy assembly and disassembly without damaging components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesives are used to lock structures together, then assembly is simple and structures are securely bonded, but rework requires heat or chemicals to breakdown adhesives causing damage
Solution Approach 1:
The locking mechanism is divided into discrete components: a locking bar with locking features and a locking shaft with corresponding features. These segmented parts can be independently assembled and disassembled without requiring heat or chemicals, resolving the contradiction between easy assembly and easy repair.
Solution Approach 2:
The patent replaces the chemical bonding system (adhesives requiring heat/chemical breakdown) with a mechanical locking system using locking bars and shafts with complementary features that engage through magnetic attraction and physical interlocking, enabling tool-free disassembly.
2Strength
If screws are used to hold parts together, then strong mechanical fastening is achieved, but thread bosses can be stripped after one or two disassemblies
Solution Approach 1:
The magnetic locking mechanism allows the device to be easily opened and closed by the user without tools. The magnetic attraction automatically guides the locking bar and shaft into engagement, and the resilient gasket provides self-adjusting compression, enabling repeated use without degradation.
Solution Approach 2:
The locking system combines multiple materials and mechanisms: magnetic materials for attraction, resilient gasket materials for compression and sealing, and precisely machined metal components for mechanical interlocking. This composite approach achieves strong fastening that can be repeatedly engaged and disengaged.
3Strength
If screws are used for assembly, then secure fastening is achieved, but tools are required and screws need covering to prevent visibility or access
Solution Approach 1:
The patent replaces traditional screw fastening with a magnetic locking system where magnetic attraction provides the fastening force. This eliminates the need for tools and visible screw heads, reducing device complexity while maintaining secure fastening.
Solution Approach 2:
The locking features are designed to be substantially hidden within recesses when engaged, and the resilient gasket can be matched to the housing color, making the locking mechanism invisible or minimally visible from the exterior, eliminating the need for cosmetic covers.
4Reliability
If traditional locking mechanisms are used, then secure assembly is achieved, but reworking requires tools and risks damage to components
Solution Approach 1:
The patent replaces mechanical screw fastening with a magnetic locking system that can be engaged and disengaged without tools. The magnetic attraction allows controlled separation by overcoming the magnetic force, eliminating the risk of stripping threads or damaging components that occurs with traditional mechanical fasteners.
Solution Approach 2:
The resilient gasket is pre-compressed between the housing and screen assembly, creating a cushioning effect that absorbs stress during assembly and disassembly. This prevents direct impact forces from damaging components while maintaining secure locking when engaged.
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
Enables secure assembly and rework of mobile devices without damaging components, reducing costs and simplifying post-assembly modifications by eliminating the need for tools and minimizing risk of damage during disassembly.
Implementation Method 1
A permanent magnet is affixed to one end of the locking shaft
Implementation Method 2
Releasing the compressive force causes the resilient gasket to at least partially rebound and traps the rod and protrusion together
Data Source
AI summary
Systems and methods for assembling a mobile cellular device do not require screws or adhesives, allowing for more efficient and less wasteful rework of the device when needed. In an embodiment, one or more fixed lock elements are attached to one a screen assembly of the device (or the device housing) and a locking shaft is retained in the housing (or the screen assembly). The locking shaft includes blocking sections that block passage of the lock elements, and non-blocking sections that permit passage of at least part of each lock element. In this way, when the screen assembly is mated to the housing, each lock element aligns with and at least partially passes over one of the non-blocking sections, such that when the locking shaft is slid axially, the lock elements align with and are retained by the blocking sections.