Tungsten-Weighted Iron Set for Consistent Ball Flight

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Solution Overview

Problem

Conventional iron golf clubs exhibit varying performance characteristics due to differences in loft, length, and center of gravity, leading to inconsistent ball trajectories and distances across the set, particularly between long, mid, and short irons.

Innovation Solution

A set of golf clubs with club heads having specific lofts and varying masses, incorporating tungsten weight members, particularly in the heel and toe, to enhance performance consistency and adjust launch angles and distances, with each club head differing by at least 5 grams in mass and utilizing tungsten to form a significant portion of the club head mass.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional iron golf clubs use standard materials and designs, then manufacturing is simpler and cost is lower, but performance consistency across the set deteriorates due to varying loft, length, and center of gravity

Engineering Contradiction:

Improveperformance consistencyVSAvoidclub head construction

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies composite materials by combining tungsten weight members with traditional iron club head materials. The tungsten members (comprising 25-50% of total club head mass) are integrated with the club head body to create a composite structure that achieves superior performance consistency through optimized center of gravity and moment of inertia, while maintaining manufacturing feasibility through established fabrication processes

Inventive Principle:

Principle #40Composite materials

2Reliability

If tungsten weight members are added to club heads, then center of gravity and moment of inertia are optimized for consistent ball flight, but club head mass increases

Engineering Contradiction:

Improveball flight consistencyVSAvoidclub head mass

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent applies parameter changes by systematically varying the mass, position, and distribution of tungsten weight members across different club heads in the set. Each club head has customized tungsten weighting (25-50% of total mass) strategically positioned to optimize center of gravity and moment of inertia for consistent ball flight, while controlling overall mass increase through precise parameter adjustment rather than uniform addition

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If each club head has varying mass by at least 5 grams, then launch angles and distances are optimized, but manufacturing precision requirements increase

Engineering Contradiction:

Improvelaunch condition optimizationVSAvoidmass differentiation

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent applies segmentation by dividing the club head into distinct components with independent mass control: the club head body and separate tungsten weight members. This allows each component to be manufactured with standard tolerances, then assembled to achieve the required 5+ gram mass differences between club heads. The segmented approach reduces overall manufacturing precision requirements compared to monolithic custom-machined heads

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12485321B2Weighted iron set

Publication Date: 2025.12.02 ACUSHNET CO

AI summary

The present invention is direct to a set of golf clubs comprising long irons, mid-irons and short irons. The invention contemplates the use of titanium or steel for the main body portion and a tungsten weight member coupled to the toe and a tungsten heel weight member coupled in a hosel cavity.