Dual Spreading Arrowhead Retention Mechanism
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Solution Overview
Problem
Conventional arrowheads used in bow hunting often fail to securely engage and retain game animals, leading to loss of the animal due to their ability to remove the hook or arrowhead, especially when the animal runs or turns, and existing solutions with retrieval lines affect flight accuracy and can entangle in brush.
Innovation Solution
A dual spreading arrowhead design featuring left and right blades with sharpened edges and a spine, mutually pinned to a head that secures to an arrow shaft, which deploys upon contact to incise the animal, utilizing the arrow's momentum to rotate outward and secure the animal, preventing it from sliding off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional arrowheads are used, then the arrow can penetrate the animal, but the animal can remove the arrowhead by running or turning
Solution Approach 1:
The arrowhead employs dynamic blades that rotate from a closed flight position to an open deployed position upon impact with the animal. The blades pivot on pins mounted on the head, allowing them to spread apart and engage the animal's body, preventing removal while maintaining aerodynamic efficiency during flight
Solution Approach 2:
The arrowhead is divided into multiple independent blades (at least two) that can move relative to each other. Each blade is separately pinned to the head and can rotate independently, allowing the structure to transition from a compact flight configuration to an expanded retention configuration upon impact
2Ease of operation
If retrieval lines are added to conventional arrowheads, then the animal can be retrieved, but flight accuracy decreases and lines can entangle in brush
Solution Approach 1:
The arrowhead structure itself provides the retention function through its deploying blades that mechanically engage the animal's body. The shaped spacers and pins create a self-contained retention mechanism that holds the animal without requiring external retrieval lines, eliminating the accuracy and entanglement problems associated with lines
3Reliability
If the arrowhead deploys upon contact, then the animal is securely retained, but the structure must be compact during flight
Solution Approach 1:
The blades are designed to be in a closed, aerodynamic position during flight and automatically deploy to an open position upon impact with the animal. The dynamic transformation allows the arrowhead to maintain optimal flight characteristics while providing secure retention upon deployment
Solution Approach 2:
The blades are pre-positioned in a closed flight configuration that maintains aerodynamic efficiency. Upon impact, the predetermined pivot points and spacing mechanisms automatically enable the blades to rotate into the deployed retention position, transitioning from flight optimization to retention function
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 dual spreading arrowhead effectively cuts into and retains the animal upon contact, ensuring the animal drops promptly and can be released without further injury, addressing the issues of animal loss and retrieval challenges in conventional designs.
Implementation Method 1
The arrowhead utilizes the momentum of the flying arrow shaft to adjust the invention from the flight position to the deployed position
Data Source
AI summary
A dual spreading arrowhead has components and operations that cut on contact with an animal. The dual spreading arrowhead has a left blade and a right blade mutually pinned to a head. The head secures to a shaft of an arrow. The left blade and the right blade each have a pointed tip and two sharpened edges. Opposite the tip, each blade has a rounded foot that travels within a slot through the head and upon a shaped spacer. Between the foot and the tip, each blade has a spine not sharpened. The arrowhead has a flight position with the tips near each other but not overlapped and a deployed position with the blades rotated outwardly and the sharpened edges mutually forward. The arrowhead utilizes the momentum of the flying arrow shaft to adjust the invention from the flight position to the deployed position.