Non-planar riser plates for archery bow side loading
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Solution Overview
Problem
Increasing the power of archery bows can lead to side loading or buckling of the riser assembly, resulting in decreased accuracy due to increased stresses and compressive forces, particularly when power cables are off-center.
Innovation Solution
The use of non-planar riser plates with concave or convex surfaces that define a gap with a non-uniform width, preloading against side buckling forces, and incorporating pulleys and cables to manage stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power of the bow is increased, then the power and efficiency are improved, but side loading and buckling of the riser assembly occur resulting in decreased accuracy
Solution Approach 1:
The riser plates are designed with non-planar, specifically concave, surfaces instead of flat surfaces. This curvature allows the riser assembly to better distribute and resist the side loading forces generated by high-power bows, preventing buckling and maintaining accuracy while preserving the increased power output.
Solution Approach 2:
The invention changes the geometric parameters of the riser plates by introducing non-uniform gap widths and concave surface profiles. These parameter changes modify the structural stiffness and load distribution characteristics of the riser assembly, enabling it to withstand the increased stresses from high-power configurations without sacrificing accuracy.
2Power
If power cables are routed off-center to increase power, then power and efficiency are improved, but side loading on the riser assembly increases causing buckling
Solution Approach 1:
The non-planar riser plate configuration acts as a structural counterbalance to the off-center cable forces. The concave geometry and non-uniform gap distribution create opposing structural stiffness that counteracts the side loading moments generated by asymmetric cable routing, allowing off-center cable placement without causing buckling.
3Ease of manufacture
If planar riser plates are used with uniform gap width, then manufacturing is simple, but the riser assembly is prone to side loading and buckling under increased stress
Solution Approach 1:
Instead of using uniformly thick planar plates, the invention applies local quality variations through non-uniform gap widths and concave surface profiles at specific locations. This allows the riser assembly to have enhanced buckling resistance exactly where the side loading forces are greatest, while maintaining simpler manufacturing compared to fully variable geometry designs.
Data Source
AI summary
Embodiments include a riser assembly for a bow. The riser assembly can include a first non-planar riser plate; and a second non-planar riser plate that is coupled to the first non-planar riser plate with one or more connectors. The first non-planar riser plate and the second non-planar riser plate define a gap there between. A width of the gap extending from the first non-planar riser plate to the second non-planar riser plate. The width of the gap varies in size such that the width of the gap at a central location of the gap is larger or smaller than the width of the gap at a location distal to the central location. Other embodiments are also included herein.