Integral Stud for Cleated Shoe Outsole

Solution Overview

Problem

Conventional studs for cleated shoes have a seam at the joint with the outsole, which can lead to separation of the stud from the outsole under continuous load, making it difficult to firmly hold the stud in place.

Innovation Solution

The stud is designed with an outer tubular portion that is integral with the outsole, eliminating the seam and ensuring continuous contact. The core portion is surrounded by the inner wall surface of the outer tubular portion, enhancing the stud's strength and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the stud is made as a separate member bonded to the outsole, then the stud can be firmly held on the outsole initially, but the seam at the joint causes separation under continuous load

Engineering Contradiction:

Improvebonding strengthVSAvoidseparation resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The stud and outsole are merged into a single integral structure formed by injection molding, eliminating the seam that causes separation. The stud boot is formed as one continuous piece with the outsole, so there is no separate bonding interface that can fail under load.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The stud is segmented into multiple parts (stud body, boot, core portion) that are formed separately but then integrated through injection molding. The core portion is inserted into the mold cavity before injecting the boot material, creating a composite structure that combines the advantages of separate components with the reliability of an integral structure.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If the stud is made as a separate member bonded to the outsole, then manufacturing is simpler, but the seam reduces reliability under continuous load

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidseparation resistance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The stud and outsole are merged into a single integral structure formed by injection molding, eliminating the seam that causes separation. The stud boot is formed as one continuous piece with the outsole, so there is no separate bonding interface that can fail under load.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If the outer tubular portion is made integral with the outsole, then separation is prevented, but the structure becomes more complex

Engineering Contradiction:

Improveseparation resistanceVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The stud is segmented into multiple parts (stud body, boot, core portion) that are formed separately but then integrated through injection molding. The core portion is inserted into the mold cavity before injecting the boot material, creating a composite structure that combines the advantages of separate components with the reliability of an integral structure.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12290150B2Stud for outsole, outsole for cleated shoe, method for producing outsole, and cleated shoe

Publication Date: 2025.05.06 MIZUNO CORPORATION

AI summary

A stud for an outsole includes: an outer tubular portion located on an outsole body and having a tubular shape; and a core portion located inside the outer tubular portion. The outer tubular portion is integral with the outsole body with no seam between the outer tubular portion and the outsole body. An inner wall surface of the outer tubular portion surrounds, and is in contact with, a side surface of the core portion. This configuration reduces separation of the stud from the outsole and firmly holds the stud on the outsole.