Golf Club Head Sole Rails for Adverse Turf Speed Retention

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Solution Overview

Problem

Existing golf club heads, particularly hybrid or utility-type clubs, experience unanticipated losses in club head speed and trajectory due to interaction with adverse turf conditions, leading to unpredictable shot distance and trajectory.

Innovation Solution

The golf club head design incorporates elongate sole rails with optimized sole contours, including recesses and varying radii of curvature, to minimize turf interaction and maintain speed retention, featuring a setback length and specific radii of curvature to enhance stability and speed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If hybrid or utility-type golf club heads are used in adverse turf conditions, then they can handle rough terrain, but club head speed is substantially reduced due to turf resistance

Engineering Contradiction:

Improveability to handle adverse turf conditionsVSAvoidclub head speed retention

Core Design Contradiction:

Adaptability or versatilityVSSpeed

Solution Approach 1:

The sole of the club head is segmented into distinct zones with different characteristics: a leading edge portion, a sole contact point, and recessed portions between them. This segmentation allows the leading edge to interact with turf for stability while minimizing contact area to reduce speed loss, resolving the contradiction between adaptability to adverse conditions and speed retention.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the sole are given different geometric properties: the leading edge has specific height and radius of curvature optimized for turf interaction, while recessed portions reduce contact area. This local differentiation enables the club head to maintain stability in rough terrain while minimizing overall turf resistance to preserve club head speed.

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If the sole contour is designed for maximum turf interaction, then stability in adverse conditions improves, but club head speed retention deteriorates

Engineering Contradiction:

Improvestability in adverse turf conditionsVSAvoidclub head speed loss

Core Design Contradiction:

Stability of the object's compositionVSLoss of energy

Solution Approach 1:

The club head design applies partial turf interaction through the leading edge portion and sole contact point, rather than full sole contact. This partial action provides sufficient stability for adverse conditions while avoiding excessive contact that would cause significant speed loss, effectively resolving the energy loss versus stability contradiction.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The sole design incorporates vertical dimension variations through recessed portions and elevated leading edge sections. This three-dimensional contouring allows the club head to achieve stability through strategic point contact rather than broad surface contact, reducing frictional energy loss while maintaining adequate turf interaction for stability.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS12539450B2Golf club head with sole rails

Publication Date: 2026.02.03 SUMITOMO RUBBER INDUSTRIES LTD

AI summary

A golf club head, when oriented in a reference position, includes: a striking face; a top portion; and a sole portion opposite the top portion. The sole portion includes a leading edge, a trailing edge, at least one sole rail generally elongate in a front-to-rear direction, and a sole contact point located on the at least one sole rail. In a virtual vertical plane extending in the front-to-rear direction and passing through the sole contact point, (i) the sole portion includes a sole length Ls measured in the front-to-rear direction from the leading edge to the trailing edge and (ii) the sole contact point is spaced rearwardly from the leading edge by a distance D1 no greater than 0.8*Ls.