Segmented Forefoot Protection Plate for Trail Running Shoes

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Solution Overview

Problem

Conventional trail running shoes provide inadequate protection for the forefoot while compromising flexibility and proprioceptive sensitivity, and existing designs with individual toe compartments face issues of alignment, comfort, and injury risk due to limited lateral motion and snagging.

Innovation Solution

A flexible forefoot protection plate with three hinged or separate sections, integrated into removable insoles or the shoe's midsole and outersole, allowing independent movement and enhanced sensitivity, combined with three toe compartments for increased protection and sensitivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If thick and sturdy outer-soles, mid-soles, and rock pads are used to provide protection from injury, then protection from injury is improved, but overall sensitivity and response of the foot when making contact with the ground is dramatically decreased

Engineering Contradiction:

Improveprotection from injuryVSAvoidsensitivity and response of the foot

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The protective plate is divided into multiple segments including a rigid portion and a flexible portion, allowing different regions to provide different levels of protection and flexibility. This segmentation enables the plate to protect against rocks and roots while maintaining ground sensitivity through the flexible portion.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The protective plate incorporates a flexible portion that can dynamically adapt to terrain variations, allowing the plate to bend and flex in response to ground contact. This dynamic flexibility maintains proprioceptive sensitivity while providing protection when needed.

Inventive Principle:

Principle #15Dynamics

2Object-affected harmful factors

If conventional trail shoes with thick soles and rock pads are used, then protection from injury is improved, but flexibility from side to side is dramatically decreased

Engineering Contradiction:

Improveprotection from injuryVSAvoidflexibility from side to side

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The protective plate is divided into a rigid portion for protection and a flexible portion for side-to-side movement. This segmentation allows the shoe to provide rock protection while maintaining the flexibility needed for natural foot movement and balance on uneven terrain.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the protective plate have different mechanical properties - the rigid portion provides protection against injury, while the flexible portion allows side-to-side flexibility. This local differentiation of material properties resolves the contradiction between protection and flexibility.

Inventive Principle:

Principle #3Local quality

3Ease of operation

If minimalist shoes with greater flexibility are used, then flexibility and ground sensitivity are improved, but protection for the forefoot from injury is decreased

Engineering Contradiction:

ImproveflexibilityVSAvoidprotection for the forefoot

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The protective plate is segmented into rigid and flexible portions, where the rigid portion provides the necessary forefoot protection against rocks and roots, while the flexible portion maintains ground sensitivity and flexibility for natural foot movement.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The protective plate combines rigid and flexible materials or structures in a single component, creating a composite solution that provides both protection and flexibility. This composite approach allows minimalist shoe benefits to be retained while adding necessary protection.

Inventive Principle:

Principle #40Composite materials

4Ease of manufacture

If a single unit toe-cap portion is used, then manufacturing simplicity is improved, but natural movements of the toes are limited and wearer comfort is reduced

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidnatural movements of the toes

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The toe-cap portion is divided into multiple independent toe compartments instead of a single unit. This segmentation allows each toe to move naturally and independently, improving comfort and foot function while maintaining reasonable manufacturing simplicity through modular construction.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS9986784B2Flexible forefoot protection for insoles and shoes

Publication Date: 2018.06.05 DOWNARD JEFFREY BRIAN

AI summary

An invention pertaining to footwear is described, including a flexible protection plate, an insole, and a shoe with three forefoot pads and three toe compartments. The sections of the protection plate are hinged or separated to allow a greater degree of independent movement of the three main groups of muscles and bones in the forefoot in response to varying walking, hiking and running terrain. A separate insole is described that incorporates the forefoot protection plate and that can be inserted into and removed from footwear in order to provide additional protection as needed. A shoe including outersole, midsole and upper, are also described in which the forward portion is divided into three toe compartments that are configured to allow independent articulation of corresponding individual toes and/or pairs of toes inserted in the footwear.