Non-Circular Weight Member for Archery Bow Cam Vibration
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Solution Overview
Problem
Existing archery bow designs struggle to reduce vibration, increase arrow launch speeds, and enhance accuracy.
Innovation Solution
A rotatable member with a non-circular weight member is integrated into the archery bow design. The weight member is oriented within a non-circular cavity and is made of a different material than the body, providing a higher density and optimizing weight distribution for reduced vibration and increased arrow speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a counteracting weight is added to reduce forward force and kick-back, then vibration is reduced, but device complexity increases
Solution Approach 1:
The weight member is integrated into the rotatable member body as a unified component, merging the weight function with the structural body to eliminate separate vibration reduction components while maintaining the counterbalancing effect
Solution Approach 2:
The rotatable member uses composite construction with a body of first material and an embedded weight member of second material, allowing optimization of both structural properties and mass distribution within a single integrated component
2Object-affected harmful factors
If limbs are extended more parallel to reduce kick-back, then forward force is reduced, but arrow launch speed decreases
Solution Approach 1:
The non-circular weight member creates variable moment of inertia during rotation, dynamically changing the mass distribution parameters to optimize both kick-back reduction and energy transfer to the arrow throughout the draw and release cycle
Solution Approach 2:
The rotatable member with non-circular weight distribution provides dynamic mass adjustment during operation, allowing the system to adapt mass distribution characteristics throughout the motion cycle to simultaneously reduce kick-back and maintain arrow speed
3Object-affected harmful factors
If a non-circular weight member is used to optimize weight distribution, then vibration is reduced and arrow speed increases, but manufacturing precision requirements increase
Solution Approach 1:
The weight member employs non-circular asymmetric geometry with strategically positioned concave and convex portions to create optimal mass distribution for vibration reduction, where the asymmetric shape is precisely engineered to achieve desired centroid and moment of inertia characteristics
Solution Approach 2:
The non-circular weight member features localized geometric variations including concave portions facing the rotation axis and convex portions at specific locations, creating local mass concentration differences that optimize vibration characteristics without requiring entire component redesign
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 vibration, increases arrow launch speeds, and enhances accuracy by optimizing the weight distribution and material properties of the rotatable member.
Implementation Method 1
The weight member comprises a second material different from the first material... providing a higher density and optimizing weight distribution for reduced vibration
Implementation Method 2
The weight member is oriented in the non-circular cavity... optimizing weight distribution for reduced vibration and increased arrow speed
Data Source
AI summary
In some embodiments, a rotatable member is arranged for use in an archery bow and comprises a body comprising a bowstring track and a non-circular cavity. The body comprises a first material. A weight member is attached to the body. The weight member comprises a non-circular shape. The weight member is oriented in the non-circular cavity. The weight member comprises a second material different from the first material.