Arrow Structural Asymmetry for Bending Axis Orientation
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Solution Overview
Problem
Existing arrow designs lack consistency in strength characteristics, making it laborious and inconsistent to determine the weak and strong axes, which affects shooting accuracy.
Innovation Solution
The arrow design incorporates a structural asymmetry, such as a stiffener with asymmetrical cross-sectional shape or features like cavities and apertures, to positively locate the weak bending axis, thereby enhancing consistency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If arrows are designed with uniform strength characteristics, then manufacturing simplicity is maintained, but consistency in strength characteristics cannot be achieved
Solution Approach 1:
The patent applies asymmetry by introducing a structural asymmetry (such as an off-center stiffener or asymmetric cross-sectional shape) into the arrow shaft. This deliberate asymmetry creates a consistent weak bending axis and strong bending axis across all arrows, replacing the need for manual orientation and ensuring uniform strength characteristics through design rather than post-manufacturing adjustment.
Solution Approach 2:
The patent applies local quality by varying the structural properties at specific locations within the arrow shaft. The structural asymmetry is introduced at a localized region (e.g., an off-center stiffener positioned at a specific radial distance from the central axis) to create the desired weak and strong bending axes, while the rest of the arrow maintains its overall symmetry and uniform properties.
2Reliability
If archers manually measure and orient each arrow to find the weak axis, then shooting consistency can be improved, but the process becomes laborious and time-consuming
Solution Approach 1:
The patent applies preliminary action by pre-orienting the weak bending axis and strong bending axis through the structural asymmetry during manufacturing. This eliminates the need for archers to perform time-consuming spine deflection testing and manual orientation of each arrow, as the correct orientation is already built into the arrow's structure. The structural asymmetry serves as a built-in reference that guides proper arrow alignment.
Solution Approach 2:
The patent applies self-service by designing the arrow to self-orient through its structural asymmetry. The asymmetric feature (such as an off-center stiffener) automatically identifies and establishes the weak and strong bending axes without requiring external measurement or adjustment by the archer. The arrow essentially orients itself through its inherent structural properties.
3Measurement precision
If spine deflection testing is performed on each arrow, then the weak and strong axes can be identified, but the process is inconsistent and laborious
Solution Approach 1:
The patent replaces the mechanical spine deflection testing process with a structural design feature. Instead of using external testing equipment and procedures to identify the weak and strong axes, the structural asymmetry (such as an off-center stiffener or asymmetric cross-section) inherently defines these axes through its geometry and material distribution. This substitution eliminates the need for repetitive mechanical testing.
Solution Approach 2:
The patent changes the structural parameters of the arrow shaft by introducing asymmetry in the form of an off-center stiffener or asymmetric cross-sectional shape. This parameter change fundamentally alters how the arrow bends, creating a consistent weak bending axis and strong bending axis that can be identified through the structural feature itself rather than through testing. The parameter change transforms the arrow from a symmetric structure requiring measurement to an asymmetric structure with built-in orientation cues.
Data Source
AI summary
In some embodiments, an arrow comprises a shaft, a nock and a structural asymmetry orienting a weak bending axis of the arrow.