Hybrid Hard Shell Elastomeric Case Design
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Solution Overview
Problem
Existing handheld electronic device cases either lack the shock resistance of elastomeric materials or suffer from high surface friction, making them difficult to use and manufacture efficiently, while cut and sew cases add bulk and increase production costs.
Innovation Solution
A single-piece protective case combining a hard exterior shell with an interior elastomeric layer, where the hard shell is formed to fit closely with cut corners allowing flexing and the elastomeric layer fills gaps for shock protection and easy device insertion, reducing friction and manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If elastomeric material is used for the case, then shock resistance is improved, but surface friction coefficient increases making it difficult to insert and remove from pockets
Solution Approach 1:
The case is divided into two distinct layers: a hard outer shell layer and an elastomeric inner lining layer. The hard outer shell provides low friction for easy insertion and removal, while the elastomeric inner lining provides shock absorption. This segmentation allows each layer to perform its specific function without compromising the other.
Solution Approach 2:
The case combines two different materials with complementary properties: a hard plastic or metal outer shell and an elastomeric inner lining. This composite structure integrates the low-friction surface of the hard material with the shock-absorbing properties of the elastomeric material, resolving the contradiction between ease of operation and shock resistance.
2Strength
If hard plastic shells are made as multiple pieces with secondary closure, then device protection is improved, but bulk and complexity increase
Solution Approach 1:
The case is divided into two distinct layers: a hard outer shell layer and an elastomeric inner lining layer. The hard outer shell provides low friction for easy insertion and removal, while the elastomeric inner lining provides shock absorption. This segmentation allows each layer to perform its specific function without compromising the other.
Solution Approach 2:
The case merges the protective function of the hard shell with the shock-absorbing function of the elastomeric lining into a single integrated structure. The elastomeric lining is attached to the inner surface of the hard shell, creating a unified case that provides both protection and comfort without requiring separate components or closure mechanisms.
3Adaptability or versatility
If cut and sew cases are made from flat stock material, then manufacturing flexibility is improved, but production cost and time increase
Solution Approach 1:
The elastomeric inner lining is formed as a thin, flexible layer that can be molded or attached to the hard outer shell. This flexible film approach allows the case to be manufactured more efficiently compared to traditional cut-and-sew methods, while still providing the necessary flexibility and fit.
Solution Approach 2:
The case combines two different materials with complementary properties: a hard plastic or metal outer shell and an elastomeric inner lining. This composite structure integrates the low-friction surface of the hard material with the shock-absorbing properties of the elastomeric material, resolving the contradiction between ease of operation and shock resistance.
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 solution provides maximum protection against impacts with a low friction design that is easy to use and manufacture, maintaining the original device feel while ensuring a snug and secure fit, preventing dirt and fluid entry.
Implementation Method 1
The rubbery material can provide very good shock resistance
Implementation Method 2
The interior elastomeric portion that provides shock protection for the device from dropping, falls, or other impacts
Implementation Method 3
The device is then held in place, by friction or a strap of some form
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
A protective case (10) for a handheld mobile electronic device (19) comprises a first portion (12) creating an exterior hard shell, including a fitted cavity (22) formed therein for mounting a handheld mobile electronic device (19) to the protective case (10), a second portion (13), permanently affixed to the fitted cavity (22) formed therein of the first portion (12). The first portion (12) comprises a protective outer layer composed of a hardened plastic and the second portion (13) comprises an elastomeric liner formed and permanently affixed on the interior of the exterior hard shell first portion (12). The second portion (13) further comprises a detent (20) for mounting a handheld mobile electronic device (19) to the protective case (10).