Granular Vibration Damper for Archery Bows
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Solution Overview
Problem
Existing vibration dampers for archery bows, particularly those using rubber and metal combinations or liquid-filled chambers, are ineffective at absorbing low-frequency vibrations and provide poor stability during aiming due to movement of weights or liquids.
Innovation Solution
A vibration damper design featuring a housing with a stack of bowl-shaped parts partially filled with granular solid material, such as steel balls, which minimizes weight and allows for modular assembly and adjustment, providing effective vibration absorption by keeping the granular material in place during slow movements and allowing it to move during rapid vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid rubber damper with solid metal weight is used, then structural strength is improved, but low-frequency vibration absorption deteriorates
Solution Approach 1:
The patent changes the physical state of the damping material from solid (rigid rubber with solid weight) to granular material that can flow and rearrange. This parameter change allows the damping system to adapt its characteristics - the granular material remains stable during slow movements providing strength, but flows during rapid vibrations to absorb low-frequency vibrations effectively.
Solution Approach 2:
The patent introduces dynamic behavior to the damping system by using granular material that transitions from a static, stable configuration during slow movements to a dynamic, flowing state during rapid vibrations. This dynamic response allows the system to provide both structural strength and vibration absorption depending on the operating conditions.
2Object-affected harmful factors
If a soft rubber damper with solid metal weight is used, then low-frequency vibration absorption is improved, but stability during aiming deteriorates
Solution Approach 1:
The patent uses granular material whose physical state changes based on the movement characteristics. During slow aiming movements, the granular material maintains a stable configuration providing compositional stability. During rapid vibrations, the material flows and rearranges to absorb vibrations, thus achieving both stability and vibration absorption through parameter changes.
Solution Approach 2:
The granular material provides a dynamic response that adapts to different movement conditions. The system transitions from a stable, static configuration during aiming to a dynamic, flowing state during vibrations, allowing the damper to maintain stability when needed and absorb vibrations when needed.
3Object-affected harmful factors
If liquid-filled chambers are used, then vibration damping is improved, but stability during aiming deteriorates due to liquid movement
Solution Approach 1:
The patent replaces liquid with granular solid material that changes its flow characteristics based on vibration intensity. Unlike liquid that continuously moves and compromises stability, the granular material maintains stability during slow movements and only flows during rapid vibrations, achieving both vibration damping and aiming stability through this parameter change.
Solution Approach 2:
The granular material acts as a temporary, sacrificial element that absorbs vibration energy through friction and rearrangement. The individual granules undergo permanent positional changes during vibration absorption, effectively 'sacrificing' their initial configuration to dampen vibrations while maintaining overall system stability.
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 effectively reduces vibrations and recoil during archery, maintaining stability by using a lightweight, modular, and adjustable structure that optimizes weight distribution and absorption, outperforming traditional dampers in low-frequency vibration management.
Implementation Method 1
The vibration damper may be used to absorb vibrations and recoil that occurs in the bow when the arrow is fired
Implementation Method 2
The hollow body partially filled with granules of a solid material is advantageous since the grains of solid material moves only at excessive vibration or rapid movement
Implementation Method 3
The grains of solid material moves only at excessive vibration or rapid movement, but is still at small shakes or slow movement when aiming
Implementation Method 4
The housing is formed by a stack of two or more bowl-shaped parts arranged along the axis, wherein the at least one chamber is closed by the subsequent part in the stack
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The invention relates to a vibration damper (35) for archery bows. The vibration damper comprises a housing (36) extending along an axis (X) and forming at least one chamber (37, 38, 39, 40), wherein the at least one chamber is partially filled with granular solid material (9). The housing is formed by a stack of two or more bowl-shaped parts (1, 2, 4) arranged along the axis, wherein the at least one chamber is closed by the subsequent part in the stack. The stack of parts is held together by a central attachment device (41) extending along the axis, to close the at least one chamber, such that the at least one chamber forms an open space circumventing the central attachment device.