Golf Iron Center of Gravity Distribution
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Solution Overview
Problem
Conventional sets of iron golf clubs have a constant center of gravity distribution, which limits the precision and variability of ball flight trajectories, as the loft angle increases, resulting in less distance and a steeper trajectory, failing to provide optimal performance across different iron types.
Innovation Solution
A set of golf clubs with progressively allocated center of gravity, where long irons have a center of gravity between 0 mm and 2.5 mm from the face center, mid-irons between 0 mm and 2.5 mm, and short irons between 3 mm and 4 mm, with heel and toe weights strategically positioned to optimize moment of inertia and loft angle, and a method of forming golf clubs involving forging, machining, and attaching weight members to create a progressive center of gravity distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a constant center of gravity distribution is used across all iron clubs, then manufacturing is simpler, but ball flight precision and trajectory variability are limited
Solution Approach 1:
The patent applies local quality by varying the center of gravity distribution specifically in the short irons (35-50 degrees loft) compared to long and mid irons. Weight members are strategically positioned in the heel or toe regions of short irons to achieve CG distances of 3-5mm from the face center, while long and mid irons maintain CG distances of 1-3mm. This localized differentiation enables precise control over ball flight trajectories for different club types without complicating the overall manufacturing process.
2Reliability
If the center of gravity is positioned closer to the face center for all irons, then long iron performance is optimized, but short iron trajectory control is reduced
Solution Approach 1:
The patent implements dynamics by creating a progressive center of gravity allocation system where the CG distance from the face center varies by club type. Long irons (15-25 degrees loft) maintain CG distances of 1-3mm for penetrating trajectories, mid irons (26-36 degrees) use 1-3mm for balanced performance, and short irons (37-47 degrees) increase to 3-5mm for steeper trajectories. This dynamic adjustment across the set allows each club type to operate optimally for its intended function.
3Stability of the object's composition
If heel and toe weights are positioned farther from the face center, then moment of inertia increases for better stability, but the center of gravity distance becomes too large affecting ball flight
Solution Approach 1:
The patent applies parameter changes by establishing specific quantitative ranges for center of gravity positioning based on loft angle. Long irons (15-25 degrees) maintain CG-X distances of 1-3mm, mid irons (26-36 degrees) use 1-3mm, and short irons (37-47 degrees) increase to 3-5mm. These parameter specifications allow weight members to be positioned optimally for both moment of inertia and trajectory control, with the understanding that higher loft clubs benefit from greater CG distance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables more precise shots by varying the center of gravity distribution through the set, allowing for predictable ball flight distances and angles, improving performance across long, mid, and short irons.
Implementation Method 1
each golf club includes a shaft with a club head attached to one end and a grip attached to the other end. The club head includes a face for striking a golf ball. The angle between the face and a vertical plane is called 'loft.'
Implementation Method 2
method of forming a golf club involving forging, machining, and attaching weight members
Data Source
AI summary
The present invention is directed to a set of golf clubs comprising long irons, mid-irons and short irons. The irons have a progressive horizontal CG location. Preferably, the long and MID irons have a CG located between about 1 mm and 3 mm towards the hosel and the short iron CG is located between about 3 mm and 4 mm toward the hosel. Further the irons can have a substantially constant blade width with progressively increasing toe height and progressively decreasing scoreline width.