Elastomeric Flange Bridge Support for Protective Case Port Durability
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Solution Overview
Problem
Existing protective cases for electronic devices often break at the port areas due to repeated stretching beyond their elastic limit when being taken on or off, as the plastic reinforcement is not adequately flexible to absorb stress.
Innovation Solution
A protective case design featuring a bridge support structure with a flexible flange and elastomeric molded portions that form a contiguous surface, allowing for stress reduction and flexibility at port openings, preventing breakage during use and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a small plastic section is molded on the screen side of the case to strengthen the port area, then the case stiffness is improved, but the bridge quickly elongates and breaks due to repeated stretching beyond its elastic limit
Solution Approach 1:
The patent applies different material properties to different regions of the case. The bridge support structure uses a flexible flange made of elastomeric material that can stretch and recover, while the substrate maintains its rigidity. This local differentiation allows the bridge area to flex without breaking while the rest of the case remains stiff.
Solution Approach 2:
The patent combines rigid substrate material with flexible elastomeric flange material to create a composite bridge support structure. This composite construction provides both the necessary stiffness from the rigid substrate and the flexibility needed to prevent breakage during repeated on/off cycles.
2Strength
If the bridge support structure is made rigid to maintain case stiffness, then structural strength is improved, but stress concentration occurs at the port opening leading to breakage
Solution Approach 1:
The flange region is specifically designed with elastomeric material properties that differ from the rigid substrate. This local quality change allows stress concentration to be managed through elastic deformation in the flange, preventing crack initiation and propagation while maintaining overall structural strength.
Solution Approach 2:
The patent changes the material parameter (flexibility) at the flange region compared to the substrate. By making the flange elastomeric rather than rigid, the stress distribution changes from concentrated to distributed, allowing the structure to accommodate deformation without breaking.
3Reliability
If the flange is made flexible to reduce stress on the bridge support structure, then durability is improved, but the molded inset may delaminate from the hard plastic substrate
Solution Approach 1:
The flange is made of elastomeric material with different mechanical properties than the rigid substrate. This local quality differentiation allows the flange to flex while maintaining strong adhesion to the substrate through proper material selection and bonding interface design.
Solution Approach 2:
The composite structure combines elastomeric flange with rigid substrate, where the bonding interface is specifically designed to maintain adhesion despite the flexibility difference. The molded inset is integrated into this composite structure, ensuring stable attachment while allowing the flange to flex without delamination.
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 design enhances the case's durability by reducing stress on the bridge support structure, allowing it to flex without breaking and maintaining stiffness, while also preventing delamination of the overmold from the hard plastic substrate.
Implementation Method 1
the flange being connected or formed with the substrate to be flexible such that the stress on the bridge support structure is reduced
Data Source
AI summary
A bridge support structure for a case or cover.