Hybrid Archery Bow Riser Structure for Stiffness and Weight
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Solution Overview
Problem
Existing archery bow risers face challenges in achieving increased stiffness and reduced weight, with metal risers being flexible and composite risers limited in shape and strength.
Innovation Solution
A hybrid riser design combining a metal portion and a carbon fiber portion, where the carbon fiber portion extends continuously for at least one-quarter to one-half of the riser's length, providing enhanced stiffness and tensile strength, while the metal portion handles compressive forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a metal riser is used, then the riser can be cut to any shape and fasteners can engage directly, but the riser tends to be more flexible and less stiff
Solution Approach 1:
The riser is constructed as a composite structure combining metal and carbon fiber materials. The metal portion provides ease of manufacture and structural integrity, while the carbon fiber portion provides enhanced stiffness and reduced weight. This composite approach resolves the contradiction by integrating the advantages of both materials.
Solution Approach 2:
The riser is divided into distinct segments: a metal portion and a carbon fiber portion. Each segment is optimized for its specific function - the metal portion for manufacturability and the carbon fiber portion for stiffness. This segmentation allows each material to perform its strength suit function.
2Strength
If a composite riser is used, then the riser has superior strength and deflection characteristics, but the riser can generally be formed in only one shape
Solution Approach 1:
The riser is segmented into a metal portion that can be manufactured in various shapes and a carbon fiber portion that provides structural strength. This segmentation allows the design to achieve both shape flexibility through the metal component and superior strength through the carbon fiber component.
Solution Approach 2:
By combining metal and carbon fiber in a composite riser structure, the invention achieves both shape versatility (from the metal portion) and superior strength characteristics (from the carbon fiber portion), resolving the contradiction between these two properties.
3Stability of the object's composition
If the carbon fiber portion extends continuously for at least one-quarter to one-half of the riser's length, then the stiffness and tensile strength are enhanced, but the manufacturing complexity increases
Solution Approach 1:
The continuous carbon fiber portion is integrated into the metal riser structure through composite material techniques. This integration provides enhanced stiffness and tensile strength while managing manufacturing complexity through established composite construction methods.
Solution Approach 2:
The carbon fiber portion is strategically positioned to extend continuously for at least one-quarter to one-half of the riser's length, providing localized enhancement of stiffness and tensile strength where most needed, rather than uniformly throughout the entire riser.
4Stability of the object's composition
If the hybrid design is used, then the stiffness and weight are improved, but the structural complexity increases
Solution Approach 1:
The hybrid riser design combines metal and carbon fiber materials to achieve improved stiffness and reduced weight. The composite structure is designed to manage the inherent structural complexity through integrated construction methods and standardized interfaces between the different material portions.
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 hybrid design achieves improved stiffness and reduced weight, enhancing the performance of archery bows by distributing forces effectively and maintaining structural integrity.
Implementation Method 1
The second portion is arranged to receive tensile forces from the first and second limbs
Implementation Method 2
The first portion is arranged to receive compressive forces from the first and second limbs
Data Source
AI summary
In some embodiments, an archery bow riser comprises a body defining a first end, a second end and a grip portion. The body defines a shooting axis and comprises a first portion and a second portion. The first portion comprises a metal and the second portion comprises carbon fibers. The first portion extends to a first side of the shooting axis and to a second side of the shooting axis, and the second portion extends to the first side of the shooting axis and to the second side of the shooting axis.