Deployable Hunting Arrow Blades for Kinetic Energy Transfer
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Solution Overview
Problem
Conventional hunting arrows lack the ability to adjust blade angles for varying target densities and do not effectively deploy kinetic energy, with safety concerns for the archer during drawing and firing due to fixed blade positions and inadequate arrow rests.
Innovation Solution
A hunting arrow design featuring deployable blades that adjust angle based on target density, with a safety system to lock blades in place during the draw and fire cycle, and an arrow rest that protects the archer's arm and hand, utilizing a mechanism where the arrow tip moves longitudinally to open and close blades upon impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional fixed blade arrow heads are used, then the arrow structure is simple, but the kinetic energy transfer to target is insufficient and cannot adapt to different target densities
Solution Approach 1:
The patent implements deployable blades that transition from a closed position during flight to an open position upon target impact. The blade assembly includes movable blades mounted on a carrier that can rotate or deploy outward when struck by the target, transforming the arrow from a static to a dynamic cutting structure. This allows the arrow to adapt its blade configuration based on flight phase versus impact phase, maximizing kinetic energy transfer while maintaining simplicity during non-operational states.
Solution Approach 2:
The arrow head is divided into multiple independent blades that can deploy separately from the shaft. Each blade is a discrete component that can be positioned independently, allowing the cutting structure to fragment and multiply upon impact. This segmentation enables the single arrow to create multiple cutting paths through the target, increasing energy transfer efficiency without requiring the entire arrow structure to be complex.
2Use of energy by moving object
If deployable blades are implemented without locking mechanism, then kinetic energy transfer can be maximized, but safety during draw and fire cycle is compromised
Solution Approach 1:
A locking mechanism is implemented that secures the blades in a closed position during the draw and fire cycle, before target impact occurs. The lock is preliminarily engaged to prevent accidental blade deployment during handling and shooting. Upon target impact, the force of collision automatically triggers the lock release, allowing blade deployment. This preliminary locking action ensures safety during critical phases while preserving the ability to deploy blades for maximum energy transfer at impact.
3Object-affected harmful factors
If conventional one-dimensional arrow rests are used, then the device is simple, but the archer's hand and arm are unprotected in the critical space
Solution Approach 1:
The arrow rest is transformed from a one-dimensional support point to a three-dimensional protective structure. The rest includes a bracket assembly with protective elements that extend into the critical space between the bow and archer's hand. This dimensional expansion creates a protective barrier or guard structure that physically blocks potential hazards while still allowing the arrow to clear the area. The added spatial dimensions provide protection without fundamentally complicating the rest's primary function of supporting the arrow.
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.