Layered Protective Case Using Flexural Bending for Thin Shock Absorption

Solution Overview

Problem

Conventional protective cases for electronic devices rely heavily on compressible soft materials that result in bulkiness and lack structural rigidity, failing to effectively absorb shock through efficient mechanisms.

Innovation Solution

A protective case design featuring semi-rigid or rigid layers separated by gaps that absorb shock through controlled bending and sliding, minimizing material compression and utilizing wavy structures for enhanced energy dissipation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If compressible soft materials are used for shock absorption, then shock protection is provided, but the case becomes bulky and lacks structural rigidity

Engineering Contradiction:

Improveshock protectionVSAvoidcase thickness

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The case is divided into multiple layers (outer layer, inner layer, and intermediate cavity) that function independently. The outer layer provides structural rigidity while the inner layer absorbs shock through bending, eliminating the need for bulky single-material construction.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The case combines rigid outer layer material with semi-rigid inner layer material to create a composite structure. This allows the case to simultaneously achieve structural rigidity from the outer layer and shock absorption from the inner layer, resolving the contradiction between protection and bulkiness.

Inventive Principle:

Principle #40Composite materials

2Reliability

If compressible soft materials are used for shock absorption, then shock protection is provided, but the case lacks structural rigidity

Engineering Contradiction:

Improveshock protectionVSAvoidstructural rigidity

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The case is divided into multiple layers (outer layer, inner layer, and intermediate cavity) that function independently. The outer layer provides structural rigidity while the inner layer absorbs shock through bending, eliminating the need for bulky single-material construction.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The case combines rigid outer layer material with semi-rigid inner layer material to create a composite structure. This allows the case to simultaneously achieve structural rigidity from the outer layer and shock absorption from the inner layer, resolving the contradiction between protection and bulkiness.

Inventive Principle:

Principle #40Composite materials

3Reliability

If conventional shock absorption mechanisms are used, then protection is provided, but material compression is excessive and inefficient

Engineering Contradiction:

ImproveprotectionVSAvoidenergy dissipation efficiency

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The inner layer is designed to dynamically bend and deform during impact rather than relying on static compression. The semi-rigid material allows controlled flexing that efficiently dissipates energy through bending mechanics, improving energy dissipation efficiency compared to conventional compression-based approaches.

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

The design achieves superior shock absorption with reduced thickness and weight, maintaining structural integrity and functional efficiency by leveraging layer displacement and flexure, applicable to a wide range of portable devices.

Implementation Method 1

The inner layer, made from a semi-rigid material, bends temporarily into the gap under impact, absorbing shock

Methodology Applied

Scientific EffectFlexural bending: Elasticity

Implementation Method 2

the inner layer protrudes to form a squeezable space, or includes a wavy structure that flattens and dissipates energy through deformation and friction

Methodology Applied

Scientific EffectDeformation: Deformation

Implementation Method 3

a wavy structure that flattens and dissipates energy through deformation and friction

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS20250236244A1Protective Case Configured to Protect via Flexural Bending of Layers

Publication Date: 2025.07.24 PATEL ROHAN VISHNUBHAI

AI summary

A protective phone case is disclosed, comprising at least one inner layer and at least one outer layer, wherein the layers are separated by one or more gaps configured to absorb shock through controlled bending and sliding rather than material compression. The inner layer, composed of semi-rigid or rigid material, deforms temporarily into the gap upon impact, reducing transmitted forces. Variations include wavy or undulating structures in the inner layer, multi-piece or multi-layer configurations, and structures that allow flattening and frictional dissipation. The case may incorporate acoustic tunnels to redirect speaker output and structural lips to protect camera lenses. The protective design offers greater rigidity and thinner construction than conventional cases, allowing reduced size and weight while preserving or enhancing shock absorption.