Expanding Blade Arrowhead Guide Pin Mechanism
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Solution Overview
Problem
Existing arrowheads with expanding blades often experience premature unfolding during flight, affecting accuracy and distance, and require additional tools or materials for folding and unfolding, which is inconvenient for hunting.
Innovation Solution
An arrowhead design featuring a main body with a fitting slot and expanding blade coupling portions, a blade assembly with a guide pin, and expanding blades with hinge shaft coupling holes and protrusions, allowing the blades to remain folded during flight and automatically unfold upon impact using an O-ring and guide pin mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If expanding blades are tied with a band or string to remain folded during flight, then flight stability is improved, but the operation becomes more complex and requires additional materials
Solution Approach 1:
The patent removes the band or string from the system entirely, replacing it with a mechanical guide pin mechanism that is an integral part of the arrowhead structure. The guide pin is extracted as a separate component that interacts with the blade assembly to control folding/unfolding without requiring external tying materials.
Solution Approach 2:
The arrowhead structure serves itself by using the guide pin and protrusion interaction to automatically control blade folding during flight and unfolding upon impact. The system eliminates the need for external bands or strings by making the folding control mechanism self-contained within the arrowhead assembly.
2Measurement precision
If expanding blades are folded during flight to improve accuracy, then flight precision is improved, but the mechanism to ensure they remain folded becomes more complex
Solution Approach 1:
The guide pin acts as an intermediary component that mediates between the blade assembly and the main body. It controls the folding state during flight through its interaction with the protrusions on the blades, and automatically allows unfolding when the arrow penetrates the target, simplifying the overall mechanism while maintaining accuracy.
Solution Approach 2:
The blade assembly transitions from a static folded state during flight to a dynamic unfolded state upon impact. The guide pin mechanism enables this dynamic transition automatically based on the arrow's interaction with the target, eliminating the need for complex locking or tying mechanisms.
3Productivity
If expanding blades are automatically unfolded upon impact to improve hunting effectiveness, then killing ability is improved, but the mechanism to prevent premature unfolding must be more reliable
Solution Approach 1:
The guide pin and protrusion arrangement is pre-configured to prevent blade unfolding during flight by maintaining a locked folded state. Upon target penetration, the reverse motion of the guide pin automatically triggers blade unfolding, ensuring reliable timing without premature activation.
Solution Approach 2:
The mechanism provides automatic feedback-based control where the guide pin's position and motion serve as feedback signals. When the arrow penetrates the target and the guide pin moves in reverse, this feedback automatically triggers the blade unfolding action, ensuring reliable and timely deployment.
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
Ensures stable flight and efficient unfolding of expanding blades only upon target impact, enhancing hunting effectiveness with improved accuracy and ease of use without additional tools.
Implementation Method 1
when the blade assembly 20 is moved rearward, the guide pin 25 pushes the protrusions 35 of the expanding blades 30 so that the expanding blades 30 are unfolded
Implementation Method 2
having a hinge shaft coupling hole 32 at one end to be coupled to be hinge-rotatable to the expanding blade coupling portion 12 by a hinge shaft 60
Data Source
AI summary
The present disclosure relates to an arrowhead having expanding blades, the arrowhead including: a main body having a fitting slot longitudinally formed and having two expanding blade coupling portions on an outer surface thereof; a blade assembly having a rear end fitted in the fitting slot of the main body, having leading edges on both sides of the front thereof, having a guide pin seat hole on a plate surface in which a guide pin is seated, and having a guide hole extending from the guide pin seat hole; and expanding blades each having a hinge shaft coupling hole at one end to be coupled to be hinge-rotatable to the expanding blade coupling portion by a hinge shaft, further having a protrusion at the one end, and having a blade at the front, wherein when the blade assembly is moved rearward, the guide pin pushes the protrusions of the expanding blades so that the expanding blades are unfolded.