Tubular Archery Bow Riser for Lightweight Structural Strength
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Solution Overview
Problem
Existing archery bows, particularly compound bows, face challenges with heavy metal risers that increase weight, complexity, and manufacturing costs, while composite risers often add weight or require elaborate manufacturing processes.
Innovation Solution
The archery bow riser is constructed using elongated tubes made from high-strength fibers or metals, with a design that includes primary and secondary riser tubes and struts to maintain orientation, allowing for lightweight, rigid construction that can be easily assembled and manufactured.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional metal risers are used to handle large bending moments, then structural strength is improved, but weight and manufacturing complexity increase
Solution Approach 1:
The riser uses composite construction combining carbon fiber tubes with aluminum alloy components. The carbon fiber tubes provide high strength-to-weight ratio while the aluminum components provide structural support, achieving both light weight and high strength requirements for handling large bending moments.
Solution Approach 2:
The riser is divided into multiple segments including upper tube, lower tube, grip, and limb pockets that can be separately manufactured and then assembled. This segmentation allows optimization of each component's material and structure, reducing overall weight while maintaining structural integrity.
2Weight of moving object
If complex composite structures are used to reduce riser weight, then weight is reduced, but manufacturing complexity and time increase
Solution Approach 1:
The riser components (tubes, grip, limb pockets) are manufactured separately using different optimal processes and then assembled together. This allows each component to be produced efficiently without requiring complex multi-step composite manufacturing for the entire assembly.
Solution Approach 2:
Different manufacturing approaches are merged: carbon fiber tubes are manufactured using composite processes while aluminum components are machined or cast, then joined through mechanical fastening. This combination leverages the advantages of both material systems and manufacturing methods.
3Strength
If larger metal risers are used to handle bending moments, then structural strength is improved, but device complexity and shipping cost increase
Solution Approach 1:
The composite construction allows the riser to achieve required strength with a more compact and efficient structure compared to traditional solid metal risers. The carbon fiber tubes provide high strength-to-weight ratio, enabling a simpler overall design.
Solution Approach 2:
By segmenting the riser into functional components that can be independently optimized and assembled, the overall device complexity is reduced. Each segment can be designed for its specific function without requiring a monolithic complex structure.
Data Source
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AI summary
An archery bow (10) is provided including opposing limbs (12, 15) and a riser (20). The riser can include a riser handle (30) and one or more primary riser elongated elements (40) extending away from the handle to respective limbs. The primary riser elongated elements can be straight, elongated round or other shaped tubes, rods or bars constructed optionally from a composite or other material. Vents can be included in ports (80) of the riser (20) to facilitate escape of air when riser elongated elements are installed in those ports. The riser can include one or more connector lugs (160, 260) disposed between tube portions to facilitate attachment of accessories to the elongated elements. The elongated elements can be bonded, adhered or otherwise fixed to the riser handle, struts, lugs and/or limb pockets, which can be constructed from a metal such as aluminum, titanium or an alloy, and which can handle significant moments and forces transferred via the elongated elements.