Bat Barrel Internal Ring Structure for Controlled COR Compliance

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Solution Overview

Problem

Existing bat designs that limit deformation to comply with performance metrics often reduce performance at lower impact forces, as they restrict flexing even at lower swing speeds due to high rigidity, leading to inconsistent performance across different impact ranges.

Innovation Solution

A bat design featuring a hollow barrel with a deformable ring suspended by rods, allowing controlled deformation at high impact forces while permitting flexing at lower forces, using a deformable ring with a smaller diameter than the barrel and aligned holes for rods to maintain a predetermined configuration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a rigid washer-shaped restriction member is used to limit deformation, then the maximum COR is controlled, but performance at lower impact forces is reduced

Engineering Contradiction:
ImproveCOR limit complianceVSAvoidbat performance at lower forces
Core Design Contradiction:
ReliabilityVSProductivity

Solution Approach 1:

The restriction member is designed to be deformable rather than rigid, allowing it to dynamically adapt its rigidity based on impact force. At low impact forces, the deformable restriction member allows barrel flexing for optimal performance. At high impact forces, it becomes sufficiently rigid to limit deformation and control COR compliance.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The restriction member's physical properties are designed to change based on applied force. The material or structural configuration allows the restriction member to transition from a flexible state during low-force impacts to a rigid state during high-force impacts, thereby adapting its deformation characteristics to different operating conditions.

Inventive Principle:
Principle #35Parameter changes

2Reliability

If the barrel is made more rigid to limit deformation, then COR compliance is achieved, but energy absorption and performance are reduced

Engineering Contradiction:
ImproveCOR complianceVSAvoidenergy absorption during impact
Core Design Contradiction:
ReliabilityVSLoss of energy

Solution Approach 1:

The restriction member provides dynamic rigidity control, remaining flexible during normal swinging and low-force impacts to allow energy absorption, and only becoming rigid when subjected to high-force impacts that would exceed COR limits. This selective rigidity preservation minimizes energy loss while ensuring compliance.

Inventive Principle:
Principle #15Dynamics

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

The design maximizes performance at both high and low impact forces by allowing controlled deformation, enhancing bat performance across various swing speeds while adhering to regulatory limits.

Implementation Method 1

the deformable ring can be configured to deform upon receiving force from an impact of the hollow barrel with an object

Methodology Applied
Scientific EffectElastic deformation: Elasticity

Implementation Method 2

Responsive to receiving force from an impact of the hollow barrel with an object, the hollow barrel can be configured to flex inwardly such that the inner surface of the hollow barrel contacts the deformable ring

Methodology Applied
Scientific EffectImpact force: Impact Force

Data Source

PatentUS20250367522A1Bat system with performance limiting structure and methods of making same
Publication Date: 2025.12.04 MIZUNO CORPORATION
  • US20250367522A1 patent drawing
  • US20250367522A1 patent drawing
  • US20250367522A1 patent drawing

AI summary

The disclosed technology includes bat comprising a first hollow barrel, a second hollow barrel disposed in the first hollow barrel and spaced a distance apart from the first hollow barrel, and a compressible material disposed between the first hollow barrel and the second hollow barrel. The disclosed technology further includes a bat, which has a hollow barrel and an internal assembly configured to resist deformation of the hollow barrel. The internal assembly includes a rod disposed longitudinally in the hollow barrel, a ring attached to the rod, a deformable sleeve (a second hollow barrel) disposed around the ring and extending longitudinally in the hollow barrel. The bat can include a compressible material disposed between the hollow barrel and the deformable sleeve.