Dual Shaft Arrow Insert With Shoulder And Collar
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Solution Overview
Problem
Current dual shaft arrow systems lack an insert that allows the inner shaft to act independently of the outer shaft, limiting penetration depth and accuracy due to friction and oscillations, and there is a need for a system that enables two shafts of differing diameters to function as a single arrow shaft.
Innovation Solution
A dual shaft arrow insert with a first portion attached to the inner shaft and a second portion fitting within the outer shaft, featuring a shoulder, collar, and threaded tap, allowing the inner shaft to telescope and maintain alignment, reducing friction and enabling deeper penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the inner shaft is permanently attached to the outer shaft using adhesives, then the arrow shaft stiffness is improved, but the inner shaft cannot act independently to reduce oscillations
Solution Approach 1:
The insert is divided into distinct functional portions: a first portion that interfaces with the inner shaft and a second portion that interfaces with the outer shaft. This segmentation allows each portion to perform its specific function independently while being part of a unified insert structure, enabling the inner shaft to move independently within the outer shaft.
Solution Approach 2:
The insert is nested within the outer shaft, creating a hierarchical structure where the first portion is positioned to interact with the inner shaft while the second portion remains within the outer shaft's inner surface. This nested arrangement allows the inner shaft to telescope independently through the insert while maintaining structural support.
2Length of moving object
If the inner shaft acts independently of the outer shaft, then penetration depth is improved, but friction between the shafts increases
Solution Approach 1:
The insert acts as an intermediary component between the inner shaft and outer shaft. It provides a controlled interface that reduces friction through its geometric design, including tapered surfaces and clearance portions that allow the inner shaft to move independently while minimizing contact resistance.
Solution Approach 2:
The insert features varying diameters and tapered surfaces that change the contact parameters between the inner and outer shafts. The first portion has a diameter that creates minimal friction contact with the inner shaft, while the second portion provides appropriate clearance within the outer shaft, optimizing the friction parameters for independent shaft movement.
3Measurement precision
If two shafts of differing diameters are combined, then arrow accuracy is improved, but alignment maintenance becomes difficult
Solution Approach 1:
The insert is designed with asymmetric geometric features including tapered surfaces and portions with different diameters that correspond to the differing shaft diameters. This asymmetric design naturally guides and maintains concentric alignment of the inner shaft within the outer shaft, compensating for manufacturing tolerances and preventing misalignment during arrow assembly and use.
Solution Approach 2:
The insert's geometric features, including tapered surfaces and clearance portions, are designed to automatically establish and maintain proper alignment during the assembly process. The preliminary geometric configuration ensures that the inner shaft is correctly positioned and aligned within the outer shaft before the arrow is even assembled, eliminating the need for complex alignment procedures.
Data Source
AI summary
A dual shaft arrow insert. The dual shaft arrow insert includes a first portion, where the first portion is configured to attach to an inner surface of a terminal end of an inner shaft of a dual arrow system. The dual shaft arrow insert also includes a second portion. The second portion is attached to the first portion and includes an outer diameter which is larger than an outer diameter of the first portion. The dual shaft arrow insert further includes a collar. The collar is attached to the second portion opposite the first portion and includes a larger outer diameter than the outer diameter of the second portion. The dual shaft arrow insert additionally includes an attachment configured to allow for attachment of an arrowhead.