Magnetically Retained Pivoting Broadhead for Archery
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Solution Overview
Problem
Existing broadheads in archery either have rigid blades that reduce flight efficiency or mechanical blades that deploy at the cost of kinetic energy, and neither effectively retains blades during flight nor allows for easy reconfiguration.
Innovation Solution
A broadhead design featuring a magnetically retained pivoting blade mechanism that deploys upon contact with a target, using a lever action to overcome the magnetic force and extend the blades, eliminating the need for expendable parts and allowing for easy conversion between configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If mechanical broadheads are used with pivoting blades, then the cutting effectiveness is improved, but kinetic energy is consumed during blade deployment
Solution Approach 1:
The patent replaces the traditional mechanical spring-based deployment system with a magnetic field-based retention system. The magnet retains the blades in a retracted position during flight, and the blades deploy when the magnetic force is overcome by the lever action of the target contact, eliminating the need for mechanical energy storage components that consume kinetic energy.
Solution Approach 2:
The patent changes the physical state or property used for blade retention from mechanical tension (springs) to magnetic attraction. This parameter change allows the blades to be held without consuming kinetic energy, as the magnetic field does not require energy input to maintain the retained state.
2Loss of energy
If fixed-blade broadheads are used, then flight efficiency is maintained, but cutting effectiveness is reduced
Solution Approach 1:
The patent creates a dynamic broadhead that transitions from a fixed-blade configuration during flight to an expanded cutting configuration upon target contact. The blades remain retracted and streamlined during flight for optimal aerodynamics, then deploy when needed, combining the advantages of both fixed and mechanical broadheads.
3Reliability
If expendable parts like O-rings are used for blade retention, then blade retention is achieved, but device complexity and maintenance increase
Solution Approach 1:
The patent removes expendable retention components like O-rings from the system and replaces them with a permanent magnet. This extraction of unnecessary components simplifies the device structure while maintaining reliable blade retention through the magnetic field.
4Adaptability or versatility
If mechanical deployment mechanisms are used, then blade expansion is achieved, but the structure becomes more complex
Solution Approach 1:
The patent replaces complex mechanical deployment mechanisms with a simple magnetic retention system. The blades are held by magnetic force and deploy naturally when the lever action from target contact overcomes the magnetic attraction, eliminating the need for intricate mechanical linkages, springs, or actuators.
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 solution ensures consistent blade deployment, maintains flight efficiency by retaining blades during travel, and allows for easy reconfiguration between fixed and expanding modes, enhancing hunting efficiency with precise and large cuts.
Implementation Method 1
a magnet positioned in an aft portion of the body as the magnet exerts an attractive force to an aft portion of the pivoting blades
Implementation Method 2
The deploying step includes deploying the pivoting blades due to a lever action of the wing portions, with the deploying overcoming the attractive force of the magnet
Data Source
AI summary
An arrow including a shaft and a broadhead attached to the shaft. The broadhead has a body having a fore section and an aft section and a plurality of pivoting blades pivotally coupled to the body and a magnet. The magnet is coupled to the body in the aft section, the magnet interacting with the plurality of pivoting blades to retain the pivoting blades during flight of the arrow.