Weightlifting Shoe with TPU Midsole for Stable Toe Splay

Solution Overview

Problem

Existing weightlifting shoes constrict the toes, preventing weightlifters from fully splaying their toes during squats, which affects performance and stability.

Innovation Solution

A weightlifting shoe design featuring a midsole made of thermoplastic polyurethane (TPU) with attached panels defining an enclosure that allows for a wider toe box, providing a maximum width of over 70% of the way from the rear to the front of the shoe, and includes straps for enhanced support and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the toe box is made narrow and constricting, then foot slippage is reduced, but toe splaying ability is compromised

Engineering Contradiction:

Improvefoot stabilityVSAvoidtoe splaying ability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The shoe employs different width characteristics at different locations: the toe box is designed with increased width (more than 70% of the way from rear to front) to allow toe splaying, while the heel and midfoot regions maintain a narrower, more secure fit to prevent slippage. This local differentiation resolves the contradiction by providing appropriate width characteristics in different functional zones of the shoe.

Inventive Principle:

Principle #3Local quality

2Ease of operation

If the toe box is made wide, then toe splaying is improved, but foot stability is reduced

Engineering Contradiction:

Improvetoe splaying abilityVSAvoidfoot stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The shoe employs different width characteristics at different locations: the toe box is designed with increased width (more than 70% of the way from rear to front) to allow toe splaying, while the heel and midfoot regions maintain a narrower, more secure fit to prevent slippage. This local differentiation resolves the contradiction by providing appropriate width characteristics in different functional zones of the shoe.

Inventive Principle:

Principle #3Local quality

3Ease of operation

If the heel is elevated, then knee range of motion is improved, but foot slippage potential increases

Engineering Contradiction:

Improveknee range of motionVSAvoidfoot stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The shoe employs different width characteristics at different locations: the toe box is designed with increased width (more than 70% of the way from rear to front) to allow toe splaying, while the heel and midfoot regions maintain a narrower, more secure fit to prevent slippage. This local differentiation resolves the contradiction by providing appropriate width characteristics in different functional zones of the shoe.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20250255377A1Weightlifting shoe

Publication Date: 2025.08.14 TYR SPORT INC

AI summary

A weightlifting shoe has a bottom sole, a midsole comprising a thermoplastic polyurethane (TPU), and one or more panels attached to one or both of the midsole and the bottom sole to define an enclosure for a person's foot. The midsole may be disposed above at least a portion of the bottom sole and may have a decreasing thickness in a direction from a rear region of the bottom sole toward a front region of the bottom sole opposite the rear region. The enclosure may have an axis defined between opposing front and rear points on the enclosure at a longest part thereof and may have a width defined perpendicular to the axis. The width of the enclosure may have a maximum value at a position along the axis that is more than 70% of the way from the rear point to the front point.