Ball Bat Barrel Stiffening via Integral Ribs
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Solution Overview
Problem
Baseball and softball bat designers face challenges in reducing the bat-ball coefficient of restitution (BBCOR) without increasing the moment of inertia (MOI), as thickening the barrel wall to enhance stiffness also increases weight and MOI, making the bat harder to swing.
Innovation Solution
The bat incorporates integral features such as inwardly projecting ribs, lips, or joints to selectively stiffen regions of the barrel, reducing BBCOR without significantly increasing MOI, using materials like composite or metallic construction with filler materials to maintain lightness and regulatory compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the barrel wall is thickened to increase stiffness and reduce BBCOR, then the barrel stiffness is improved, but the bat weight and moment of inertia increase
Solution Approach 1:
The patent applies local quality by implementing variable wall thickness in the barrel, where the wall is thicker at specific locations (such as the sweet spot or impact zones) to increase local stiffness and reduce BBCOR, while maintaining thinner walls in other regions to minimize overall weight. This selective thickening allows the barrel to meet performance standards without uniformly increasing the bat's weight throughout.
Solution Approach 2:
The barrel is segmented into multiple zones with different wall thicknesses, allowing independent optimization of stiffness in high-impact areas versus weight reduction in low-impact areas. This segmentation enables the design to satisfy BBCOR requirements at critical locations while keeping the overall moment of inertia lower than a uniformly thickened barrel would produce.
2Reliability
If the barrel wall is thickened to reduce BBCOR, then the barrel performance is limited, but the moment of inertia increases making the bat harder to swing
Solution Approach 1:
By concentrating additional material only where needed for BBCOR compliance (such as at the impact zone or sweet spot), the design achieves reliable performance certification without adding excessive weight that would hinder swingability. The localized reinforcement ensures regulatory compliance while preserving the bat's overall balance and swing characteristics.
Solution Approach 2:
The barrel wall thickness is segmented into different regions, with thicker sections positioned to satisfy BBCOR standards and thinner sections positioned to minimize the moment of inertia. This strategic segmentation allows the bat to meet reliability requirements while maintaining ease of operation and swingability.
Data Source
AI summary
A ball bat includes a barrel having one or more integral features for selectively stiffening regions of the barrel. The barrel may include an indented region forming a rib projecting inwardly into the barrel. Alternatively, one or more inwardly projecting lips may be formed on adjoining barrel sections that are bonded, welded, or otherwise attached to each other, such that an integral, internal rib is formed in the barrel. The internal rib stiffens the barrel, thus reducing the barrel's BBCOR. One or more integral ribs may be provided at any desired barrel locations for selectively limiting the barrel's performance without appreciably increasing the moment of inertia of the ball bat. In another embodiment, a joint, to which two barrel sections are bonded, welded, or otherwise attached, includes an inwardly projecting member that stiffens the barrel, thus reducing the barrel's BBCOR.