Metal-Carbon Fiber Archery Bow Riser for Stiffness and Weight Balance
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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 first portion with a carbon fiber second 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 maintaining a lightweight structure.
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.
2Strength
If a composite riser is used, then the riser has superior strength and deflection characteristics, but the riser can generally be formed in a mold producing only one shape
Solution Approach 1:
The riser is divided into distinct segments: a metal portion and a carbon fiber portion. This segmentation allows each material to be optimized for its specific properties while being assembled together. The metal portion can be manufactured with various shapes and sizes, while the carbon fiber portion provides the desired stiffness characteristics, resolving the contradiction between shape versatility and strength.
3Strength
If the carbon fiber portion extends further along the riser, then the stiffness and tensile strength increase, but the weight increases
Solution Approach 1:
The carbon fiber reinforcement is applied locally to specific portions of the riser where tensile strength and stiffness are most needed, rather than uniformly throughout. This localized approach allows the riser to achieve enhanced performance characteristics in critical areas while minimizing unnecessary weight in other regions.
4Strength
If the carbon fiber portion extends continuously for at least one-quarter to one-half of the riser length, then the stiffness is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The riser is segmented into distinct metal and carbon fiber portions that can be manufactured separately and then assembled. This segmentation simplifies the manufacturing process compared to creating a fully composite riser in one piece, while still achieving the desired stiffness through the continuous carbon fiber portion in critical areas.
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.