Low-Hosel-Bore Golf Club Head for Loft and Lie Adjustment

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Solution Overview

Problem

Golf club heads often require post-manufacture adjustments in loft and lie angles, which can lead to cosmetic flaws and structural failure due to excessive bending, limiting adjustability and durability.

Innovation Solution

A golf club head design featuring a shortened hosel with a lengthened hosel bore that allows for greater adjustability and disperses stress over a larger surface area, reducing the risk of failure and stress marks, while enabling discretionary mass redistribution for improved performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the hosel is bent further to achieve greater adjustability in loft and lie angles, then the adjustability is improved, but the club develops cosmetic flaws such as stress marks and/or structurally fails

Engineering Contradiction:

Improveadjustability in loft and lie anglesVSAvoidstructural integrity and absence of stress marks

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The hosel is divided into multiple zones with different wall thicknesses: a first zone with greater wall thickness and a second zone with lesser wall thickness. This segmentation allows different portions of the hosel to undergo different degrees of bending, enabling greater overall adjustability while the thicker first zone resists stress concentration and prevents cosmetic flaws.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the hosel are given different properties through varying wall thicknesses. The first zone has greater wall thickness to resist stress during bending, while the second zone has lesser wall thickness to allow necessary flexing. This local differentiation enables the hosel to achieve both high adjustability and structural integrity.

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If conventional club heads are manufactured with standard hosel dimensions, then manufacturing simplicity is maintained, but post-fabrication bending is limited to approximately ±2 degrees before developing stress marks or structurally failing

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidrange of post-fabrication bending

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The hosel is segmented into zones with different wall thicknesses, allowing the club head to withstand greater bending angles (up to ±4 degrees or more) without structural failure or cosmetic flaws, while still being manufacturable using conventional processes.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The wall thickness parameter of the hosel is varied across different zones rather than being uniform. This parameter change enables the hosel to accommodate greater bending angles while maintaining structural integrity, expanding the range of post-fabrication adjustability.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the hosel bore is lengthened to extend into the club head body, then stress is dispersed over a larger surface area reducing stress concentration, but the hosel length is increased

Engineering Contradiction:

Improvestress distribution and resistance to failureVSAvoidhosel length

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The hosel bore is segmented into regions with different wall thicknesses, and the bore is lengthened to extend into the club head body. This extension disperses stress over a larger surface area during bending, reducing stress concentration and improving reliability, while the segmented wall thickness design manages the increased length effectively.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250332490A1Golf club head with low hosel bore

Publication Date: 2025.10.30 KARSTEN MFG CORP

AI summary

Iron-type golf club heads have a shortened hosel and lengthened hosel bore. The iron-type golf club head allows for a range of loft and lie adjustability post-manufacture with maintained or reduced visible surface deformation and durability loss, and also creates discretionary mass that can be placed strategically for performance benefits. Additionally, an insert having weight members is coupled to a rear of the club head to facilitate swing weighting.