Two-Stage Broadhead Arrowhead Expansion Mechanism
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Solution Overview
Problem
Conventional expanding broadhead arrows often experience undesirable steering during flight due to exposed blades, leading to reduced cutting effectiveness and incomplete expansion upon impact, and existing solutions are prone to premature opening or require high initial force for expansion.
Innovation Solution
A two-stage expanding broadhead arrow design where the initial launch energy sets the arrowhead in a partially open state, allowing minimal impact force to fully open the blades, reducing wind drag and ensuring effective cutting with sharpened edges, and optionally including side blades that open with the main blades upon impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the broadhead blades are exposed during flight to maximize cutting area, then the cutting effectiveness is improved, but the arrow experiences undesirable steering and increased wind drag
Solution Approach 1:
The broadhead arrow employs dynamic blade configuration where the blades transition from a closed/retracted position during flight to an open/expanded position upon impact. This dynamic adjustment allows the system to optimize for low drag during flight, then maximize cutting surface area when needed, resolving the contradiction between cutting effectiveness and flight stability.
2Stability of the object's composition
If the broadhead blades are closed and hidden within the body during flight to reduce steering, then flight stability is improved, but the cutting area upon impact is reduced
Solution Approach 1:
The broadhead arrow separates the flight function from the cutting function through temporal segmentation. During flight, blades remain closed to maintain stability. Upon impact, the retaining ring fails and blades segment outward to maximize cutting area. This segmentation allows each function to be optimized independently without compromising the other.
3Reliability
If conventional annular retaining rings are used to hold blades closed, then blade retention during flight is achieved, but the rings are prone to cracking when elastomer material dries out
Solution Approach 1:
The patent replaces the elastomer-based retaining ring with an alternative retention mechanism that eliminates the drying-out issue. This parameter change in material composition and retention mechanism design maintains reliable blade retention during flight without the vulnerability to environmental degradation that causes cracking in conventional elastomer rings.
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 two-stage expansion mechanism ensures reliable opening upon impact, reducing wind resistance and enhancing cutting efficiency, allowing for a clean kill and easier tracking of game while maintaining a low flight profile and compact storage.
Implementation Method 1
a compression spring contained within the body and engaged against the forward end of the plunger
Implementation Method 2
the first stage partially expands the arrow head when forward momentum is exhorted onto the arrow, and the second stage fully expands the broadhead arrow when the tip of the arrow makes contact
Data Source
AI summary
Improvements in a broadhead arrow is disclosed where the arrowhead opens in two stages. This provides a broadhead arrow that can be launched with a traditional or compound bow to allow a hunter to bring down large game in an efficient manner. When an arrow is launched the arrow receives a thrust of energy from the string that launches the arrow. The initial thrust partially opens the arrowhead in a first stage of opening to provide a low fight profile that reduces flight air resistance. Regardless of how hard the initial thrust imparted onto the back of the arrow the blades will not open. Because the initial forward launch has no effect on the final opening of the arrow, only minimal impact forces are needed to completely open the broadhead arrow. The broadhead arrow optionally includes at least one side blade that operate with the main blade.