Arrowhead Broadhead With Delayed Deployment Blades
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Solution Overview
Problem
Mechanical broadheads face issues with energy loss and inefficient cutting due to deflection on angled shots, dulling of cutting edges from cutting through bone, and suboptimal deployment mechanisms that lead to unnecessary energy expenditure when penetrating the exterior of a target animal.
Innovation Solution
A mechanical broadhead with delayed deployment blades featuring a pivotable design where the knife portion is sharpened and the wing portion has a sharpened edge, allowing efficient cutting by pivoting around bones rather than through them, with a rubber O-ring mechanism to deploy blades upon contact, maintaining kinetic energy and creating a larger internal channel upon entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If mechanical broadheads with blades that deploy on contact are used, then streamlined flight is achieved with less drag, but kinetic energy is lost from cutting through bone and the cutting edge becomes dull
Solution Approach 1:
The broadhead is designed with blades that are pre-positioned in a streamlined configuration during flight, and the deployment action is triggered automatically upon contact with the target. This preliminary positioning eliminates the need for complex active control mechanisms during flight, reducing drag while maintaining the capability for effective deployment upon impact.
Solution Approach 2:
The broadhead transitions from a static streamlined configuration during flight to a dynamic deployed configuration upon contact with the target. This dynamic transformation allows the broadhead to optimize its aerodynamic properties during flight while maximizing its cutting effectiveness upon impact, resolving the contradiction between streamlined flight and effective deployment.
2Strength
If blades are fully deployed upon contact, then maximum cutting trauma is achieved, but deflection occurs on highly angled shots
Solution Approach 1:
The broadhead employs a dynamic deployment mechanism where blades transition from a streamlined in-flight position to a deployed cutting position upon contact with the target. This dynamic transformation ensures that maximum cutting trauma is achieved only when needed (upon contact), while maintaining streamlined aerodynamics during flight to prevent deflection on angled shots.
Solution Approach 2:
The broadhead's deployment mechanism is self-actuating, utilizing the contact force with the target to trigger blade deployment. This eliminates the need for external control systems or complex mechanical actuators that could cause deflection, allowing the broadhead to automatically transition to its cutting configuration upon impact while maintaining flight stability.
3Loss of energy
If wing portions extend outwardly during flight, then less drag is created, but energy is lost when cutting through the exterior of the target animal
Solution Approach 1:
The broadhead features dynamically positioned blades that transition from an extended streamlined configuration during flight to a deployed cutting configuration upon contact. This dynamic reconfiguration allows the wing portions to extend outwardly during flight to minimize drag, then deploy inward to cut through the target exterior efficiently, resolving the contradiction between drag reduction and energy conservation.
Solution Approach 2:
The blades are pre-positioned in a streamlined configuration during flight, with the wing portions extended outward to minimize drag. Upon contact with the target, the blades automatically deploy to their cutting position, eliminating the need for complex active control mechanisms and reducing energy loss during penetration while maintaining simple device architecture.
Data Source
AI summary
A mechanical broadhead arrowhead having a plurality of delayed deployment blades pivotably connected to the body of the arrowhead. Each blade has a longer knife portion and a shorter wing portion. The wing portion has a sharpened edge along at least part of the side facing the knife portion. The blade has a pivot point where the centerlines of the knife portion and wing portion intersect.