Elastic Collar Broadhead for Expanded Cutting Radius
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Solution Overview
Problem
Existing broadheads have a limited cutting radius due to the design of their collars, which restricts the blades' ability to maximize their cutting edge exposure upon impact, leading to suboptimal performance in target penetration.
Innovation Solution
A broadhead design featuring an elastic collar that pivotally couples blades to a ferrule, allowing for multiple deployment positions through biasing forces, increasing the cutting radius by adjusting the angle of the blades relative to the ferrule's longitudinal axis upon impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a traditional collar design with a notch or cut is used to retain blades in a retracted position, then the blade retention is simple and reliable, but the cutting radius is limited due to the fixed blade position
Solution Approach 1:
The collar transitions from a static structure with a fixed notch to a dynamic elastic structure that can deform and exert continuous biasing forces. This allows the blades to move between retracted and deployed positions while maintaining reliable retention, thereby increasing the cutting radius without sacrificing retention reliability.
Solution Approach 2:
The invention changes the physical state of the collar from rigid to elastic, allowing it to deform under impact forces. This parameter change enables the collar to exert biasing forces that control blade deployment, transforming the fixed blade position into an adjustable configuration that maximizes cutting radius.
2Ease of operation
If the collar is designed to shatter or break upon impact to release the blades, then the blade deployment is forceful and effective, but the collar structure becomes fragile and limited in functionality
Solution Approach 1:
The collar material properties are changed from brittle (designed to shatter) to elastic (designed to deform and exert force). This parameter change allows the collar to maintain structural integrity while still providing effective blade deployment through elastic biasing forces, improving both reliability and deployment effectiveness.
Solution Approach 2:
The invention replaces the brittle fracture mechanism with an elastic deformation mechanism. Instead of relying on the collar shattering to release blades, the elastic collar exerts continuous biasing forces that control blade deployment, providing a more reliable and controllable mechanical system.
3Speed
If the blades are retained in a fixed retracted position during flight, then the aerodynamic stability is maintained, but the cutting edge exposure is maximized only after collar failure
Solution Approach 1:
The blade system transitions from a static fixed position to a dynamic controlled position. The elastic collar allows blades to remain retracted during flight for stability, then dynamically deploy to exposed positions upon impact, optimizing both flight performance and cutting efficiency at different stages.
Solution Approach 2:
The elastic collar is pre-loaded with biasing forces that prepare the blades for deployment before impact. This preliminary action ensures that upon contact with the target, the blades can quickly transition from retracted to deployed positions, maximizing cutting efficiency without compromising flight stability.
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 design enhances the cutting radius by allowing blades to pivot into optimal deployed positions, increasing the broadhead's cutting efficiency and penetration capabilities.
Implementation Method 1
an elastic collar, and a plurality of blades pivotally coupled to the ferrule. Each blade includes a retention region and a deployment region. A first biasing force exerted by the collar on the retention region retains the blade in a retracted position, and a second biasing force exerted by the collar on the deployment region retains the blade in a first deployed position.
Data Source
AI summary
A broadhead having a ferrule, an elastic collar, and a plurality of blades pivotally coupled to the ferrule. A first biasing force exerted by the collar on each blade retains the blade in a retracted position, and a second biasing force exerted by the collar on each blade retains the blade in a first deployed position.