Deployable Blade Hunting Arrow Kinetic Energy Transfer
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Solution Overview
Problem
Conventional hunting arrows lack the ability to effectively deploy blades upon impact, leading to inefficient kinetic energy transfer and limited damage to targets due to fixed blade designs and inadequate consideration of target density, and they do not provide adequate safety for the archer during drawing and firing.
Innovation Solution
A hunting arrow design featuring a shaft with deployable blades that open radially upon impact, adjustable blade angles, and a safety system to lock blades in place during the draw and fire cycle, along with a safety bracket to protect the archer's arm and hand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional fixed blade designs are used, then the arrow structure is simple, but kinetic energy transfer to the target is inefficient
Solution Approach 1:
The patent applies dynamics by transitioning from fixed blades to deployable blades that change position during flight. The blades are concealed during flight and deploy upon target impact, allowing the system to adapt its configuration dynamically. This resolves the contradiction by enabling efficient energy transfer through blade deployment while maintaining simple structure during flight through concealment mechanisms.
Solution Approach 2:
The patent applies preliminary action by pre-positioning the blades in a concealed state during flight, ready for deployment. The blade mechanism is prepared in advance with spring-loaded or cam-actuated systems that will automatically deploy upon impact. This allows the arrow to maintain simple flight characteristics while being pre-configured for efficient energy transfer at the moment of impact.
2Loss of energy
If blades are deployed upon impact, then kinetic energy transfer is maximized, but the mechanical tip absorbs disproportionate kinetic energy
Solution Approach 1:
The patent applies segmentation by dividing the arrow into distinct functional components: the tip for initial contact and penetration, and the blades for secondary energy transfer. The tip is designed to penetrate the target and initiate blade deployment, while the blades separately handle the main energy transfer function. This segmentation prevents the tip from absorbing all kinetic energy, as the blades take over the primary energy transfer role after deployment.
Solution Approach 2:
The patent applies the intermediary principle by using the target material itself as a mediator between the tip and the blades. The tip penetrates the target and the target material facilitates blade deployment, rather than the tip directly transferring all energy to the blades. This intermediary action allows gradual energy transfer and protects the tip from absorbing disproportionate energy.
3Productivity
If blade deployment mechanism is added, then cutting effectiveness is improved, but arrow weight increases
Solution Approach 1:
The patent applies this principle by using thin, flexible blade structures that can be concealed within the arrow shaft. The blades are designed as thin elements that deploy from compact housings, minimizing the weight penalty while maintaining cutting effectiveness. The flexible nature of the blades allows them to be stored in a compact form during flight and deployed when needed.
Solution Approach 2:
The patent applies dynamics by using lightweight spring-loaded or cam-actuated deployment mechanisms that add minimal weight. The blades remain concealed during flight and deploy only upon impact, allowing the use of lighter materials and smaller mechanism components compared to permanently extended blades. This dynamic approach reduces the overall weight penalty while maintaining cutting effectiveness.
4Object-affected harmful factors
If safety system is added to lock blades during draw and fire, then archer safety is improved, but device complexity increases
Solution Approach 1:
The patent applies merging by combining the safety locking function with the existing blade deployment mechanism. The same cam or spring system that controls blade deployment also serves as the locking mechanism during draw and fire. This integration eliminates the need for separate safety components, reducing overall complexity while maintaining archer safety.
Solution Approach 2:
The patent applies self-service by designing the safety locking mechanism to automatically engage during the draw process and automatically release upon impact. The mechanism uses the natural motion of drawing and firing the bow to lock the blades in place, and the impact force itself triggers the release. This automatic operation eliminates the need for additional controls or complex safety systems.
Data Source
AI summary
A hunting arrow having an arrow shaft with a front end and a back end. The hunting arrow has at least one arrow blade attached to the arrow shaft, and has a closed position and at least one open position. The at least one arrow blade is substantially flush with the arrow shaft when in the closed position, and extends radially outward from the arrow shaft when in an open position. In addition, the hunting arrow has an arrow tip that is attached to the front end of the arrow shaft and is capable of moving longitudinally toward or away from the arrow shaft. The arrow tip is operatively engaged with the at least one arrow blade so that the arrow tip opens and closes the at least one arrow blade by moving relative to the arrow shaft.