Ball Bat Handle Joint Structure for Vibration Damping
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Solution Overview
Problem
Existing two-piece ball bats do not have optimal shock-attenuating characteristics, leading to discomfort and potential injury due to vibration and shock during impact with a ball.
Innovation Solution
A ball bat design featuring a joint with a rod element surrounded by a filler material, such as an elastomeric material, positioned at or near a vibrational antinode to absorb vibration and reduce shock transfer between the barrel and handle portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing two-piece ball bats are used, then some shock attenuation is provided through flex at the joint, but the shock-attenuating characteristics are not optimal and player discomfort or injury still occurs
Solution Approach 1:
The joint incorporates a rod element surrounded by filler material, creating a composite structure that combines the structural integrity of the rod with the shock-absorbing properties of the filler material. This composite construction optimizes shock attenuation while maintaining joint strength.
Solution Approach 2:
The rod element acts as an intermediary component between the barrel and handle sections, providing a controlled connection that allows for optimized shock transmission and attenuation. The rod mediates the interaction between the rigid bat sections and the flexible filler material.
2Object-affected harmful factors
If the joint is positioned at a vibrational antinode, then shock and vibration are maximally reduced, but the structural integrity and whip effect may be compromised
Solution Approach 1:
The joint design provides different properties at different locations: the rod element provides structural strength at the joint location, while the surrounding filler material provides vibration attenuation. This local differentiation of properties allows simultaneous optimization of strength and vibration reduction.
Solution Approach 2:
The combination of rod element and filler material creates a composite joint that simultaneously provides structural integrity through the rod and vibration attenuation through the filler, resolving the contradiction between strength and vibration reduction.
3Object-affected harmful factors
If more filler material is used in the joint, then shock attenuation is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The joint is segmented into distinct components (rod element and filler material) with clear functional separation. This segmentation allows for simplified manufacturing of individual components and easier assembly, reducing overall manufacturing complexity while maintaining effective shock attenuation.
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
Enhances player comfort by significantly reducing shock and vibration felt during ball impact, improving the overall performance and safety of the bat.
Implementation Method 1
The filler material may be an elastomeric material
Implementation Method 2
The joint may be positioned at or near a vibrational antinode to absorb vibration and reduce shock transfer
Data Source
AI summary
A ball bat includes a first bat portion (such as a barrel portion) and a second bat portion (such as a handle). The portions may be spaced apart along the bat's longitudinal axis. A joint connects the first and second bat portions. The joint may be positioned at or near, or centered about, a location of maximum vibration, such as an antinode of the bat. The joint may include a filler material (such as an elastomeric material) at least partially surrounding a rod element. The filler material and the rod element may span a gap between the first and second bat portions. The filler material and the rod element may extend into the first bat portion or the second bat portion. A cover material may be positioned around the filler material. The joint may form a structural link between the bat portions and it may be configured to absorb vibration.