Muscle-Back Iron Head With Adjustable Back-Cavity Weighting

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Solution Overview

Problem

There is a need for an iron-type golf club head that improves mass distribution for inertial performance while maintaining the aesthetics of a full muscle-back iron.

Innovation Solution

The golf club head incorporates a lightweight back-cavity insert with a void to accommodate a CTP weight, allowing for adjustable mass characteristics and improved center of gravity, while retaining a traditional muscle-back appearance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If a traditional muscle-back iron design is used, then aesthetic appearance is maintained, but mass distribution and inertial performance are insufficient

Engineering Contradiction:
Improveaesthetic appearanceVSAvoidinertial performance
Core Design Contradiction:
ShapeVSStrength

Solution Approach 1:

The patent combines a lightweight material (such as aluminum or titanium) with a dense material (such as tungsten or lead) to create a composite back-cavity insert. This composite structure allows the clubhead to achieve optimized mass distribution and improved inertial performance while maintaining the aesthetic appearance of a traditional muscle-back iron design.

Inventive Principle:
Principle #40Composite materials

2Strength

If mass is added to improve center of gravity, then inertial performance is enhanced, but the aesthetic appearance of a muscle-back iron is compromised

Engineering Contradiction:
Improveinertial performanceVSAvoidaesthetic appearance
Core Design Contradiction:
StrengthVSShape

Solution Approach 1:

The patent places dense material strategically within the back-cavity insert to optimize mass distribution and center of gravity. This localized concentration of mass allows the clubhead to achieve enhanced inertial performance while the overall structure maintains the clean, traditional aesthetic appearance of a muscle-back iron without visible additions.

Inventive Principle:
Principle #3Local quality

3Strength

If a lightweight back-cavity insert is added, then mass distribution is optimized, but device complexity increases

Engineering Contradiction:
Improvemass distributionVSAvoidstructural complexity
Core Design Contradiction:
StrengthVSDevice complexity

Solution Approach 1:

The patent integrates the back-cavity insert as a unified component within the clubhead structure. The insert is designed to fit into the back cavity and is secured through interference fit, mechanical retention features, or adhesive bonding, creating a combined structure that optimizes mass distribution without requiring complex assembly mechanisms or multiple separate components.

Inventive Principle:
Principle #5Merging (Combining)

Data Source

PatentEP4494720B1Forged iron head
Publication Date: 2025.12.03 KARSTEN MFG CORP
  • EP4494720B1 patent drawingFigure 1~2
  • EP4494720B1 patent drawingFigure 3A~3B
  • EP4494720B1 patent drawingFigure 4A~4B

AI summary

The invention described herein is an iron-type golf club head having an optimized mass distribution while also having the aesthetics of a full muscle-back iron. The iron-type golf club head comprises a main club head body, a lightweight, back-cavity insert, and a void within the lightweight, back-cavity insert configured to receive a CTP weight capable of adjusting mass characteristics of the iron-type golf club head.