Elastomeric Vibration Damper With Apertures And Spokes
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Solution Overview
Problem
Handheld devices such as firearms and archery bows experience uncomfortable vibrations and noise due to residual energy and vibrations after firing or use, which existing vibration dampers have not adequately addressed.
Innovation Solution
A vibration damper comprising a resilient member and a mass supported by the resilient member, with the mass consisting of a first weight, a resilient portion, and an inner weight, where the resilient portion suspends the inner weight with respect to the first weight, and the resilient members are made of elastomeric materials with specific apertures and spokes to optimize damping characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing vibration dampers are used, then some vibration reduction is achieved, but the vibrations and noise are not adequately reduced
Solution Approach 1:
The mass is divided into an outer weight and an inner weight, with the inner weight suspended by a resilient portion. This segmentation allows different parts of the mass to move independently, creating multiple damping mechanisms that more effectively reduce vibrations and noise across a broader frequency range compared to a single solid mass.
Solution Approach 2:
The resilient member is constructed from composite materials including an elastomeric material forming a body with apertures and spokes, and a second material occupying the apertures. This composite structure combines the flexibility and energy absorption of elastomeric materials with the damping properties of the second material, achieving superior vibration reduction.
2Device complexity
If a simple mass is used in the damper, then the device complexity is low, but the damping effectiveness is insufficient
Solution Approach 1:
The mass is segmented into outer and inner weights with the inner weight suspended by a resilient portion. This segmentation adds damping effectiveness through independent motion of mass components while maintaining a relatively compact and integrated overall structure that does not excessively increase device complexity.
Solution Approach 2:
The inner weight is nested within the outer weight, with the resilient portion suspending the inner weight inside the cavity of the outer weight. This nested configuration maximizes the damping effectiveness within a compact volume, achieving enhanced vibration reduction without proportionally increasing the external dimensions or complexity of the damper.
3Object-affected harmful factors
If resilient members with apertures and spokes are used, then the damping characteristics are optimized, but the manufacturing complexity increases
Solution Approach 1:
The resilient member incorporates a porous structure with apertures that are filled with a second material. This porous configuration allows for optimized damping characteristics by enabling fluid or gas flow through the structure and providing a large surface area for energy dissipation, while the apertures can be formed using standard molding or machining techniques.
Solution Approach 2:
The resilient member uses composite materials where an elastomeric material forms the structural body with apertures and spokes, and a second material fills the apertures. This composite approach allows each material to contribute its optimal properties (flexibility, structural integrity, damping) while being manufactured using established composite fabrication processes.
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 vibration damper effectively reduces vibrations and noise in handheld devices by utilizing elastomeric materials and a multi-weight configuration to absorb and dissipate energy, providing a comfortable and stable operation.
Implementation Method 1
a vibration damper comprises a resilient member and a mass supported by the resilient member
Implementation Method 2
Each of the first and second materials is elastomeric
Implementation Method 3
The mass comprises a first weight, a resilient portion and an inner weight
Data Source
AI summary
In at least one embodiment, a firearm comprises a stock comprising a vibration damper. The vibration damper comprises a first resilient member, a second resilient member and a mass. Each resilient member is attached to the stock and comprises a first material and a second material. Each of the first and second materials is elastomeric. The first material defines a body of the resilient member, the body defining apertures therein and spokes extending between adjacent apertures. The second material of each resilient member occupying an entire cross-section of each aperture defined in the first material of the resilient member. The mass is supported by said first and second resilient members.