Broadhead Blade Deployment Mechanism for Consistent Retention
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Solution Overview
Problem
Conventional mechanical broadheads face issues with inconsistent blade deployment and retention due to complex mechanisms, which can lead to poor penetration and are prone to premature deployment or failure when exposed to dirt and debris.
Innovation Solution
A broadhead design featuring a ferrule with a longitudinal slot and movable blades that pivot or slide, utilizing mechanisms such as lever arms, retention arms, and biasing elements to securely hold blades in both retracted and deployed modes, ensuring consistent deployment and retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex mechanisms are used to hold blades in retracted mode and allow deployment, then blade retention and deployment capability are improved, but device complexity increases and reliability decreases due to sensitivity to dirt and debris
Solution Approach 1:
The broadhead is divided into distinct functional components: a ferrule body, movable blades, lever arms, and biasing elements. Each component has a specific function, and the segmentation allows the blades to be independently controlled for retraction and deployment without requiring a complex integrated mechanism.
Solution Approach 2:
The blade retention and deployment system uses dynamic elements including biasing elements that apply continuous force and lever arms that pivot to transition blades between retracted and deployed modes. This dynamic approach replaces static complex locking mechanisms with simpler force-based control.
2Reliability
If complex mechanisms are used for blade retention and deployment, then blade control capability is improved, but the mechanism becomes prone to premature deployment or failure when exposed to dirt and debris
Solution Approach 1:
The invention extracts the essential function of blade retention and deployment from complex multi-component mechanisms, using only the necessary elements: ferrule walls, lever arms, and biasing elements. This minimalistic approach removes potential failure points where dirt and debris could interfere with operation.
Solution Approach 2:
The biasing elements continuously apply force to maintain blade retention during flight and enable automatic deployment upon impact without requiring additional control mechanisms. The system serves itself through the natural forces of aerodynamics during flight and impact forces during deployment, reducing sensitivity to environmental contaminants.
3Measurement precision
If blades are held in retracted mode during flight, then aerodynamic steering is reduced and trajectory accuracy is improved, but penetration capability is reduced when blades do not deploy properly
Solution Approach 1:
The biasing elements pre-load the blades in a retracted position during flight to prevent aerodynamic steering and maintain trajectory accuracy. Upon impact, the pre-stored energy in the biasing elements immediately drives blade deployment to ensure penetration capability is achieved without delay.
Solution Approach 2:
The blade system dynamically transitions from a retracted state during flight to a deployed state upon impact. The lever arms pivot smoothly between these states, and the biasing elements provide the necessary force to ensure complete deployment when penetration is required, adapting to the operational phase automatically.
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 ensures consistent and reliable blade deployment and retention, preventing premature opening during flight and ensuring precise deployment under controlled forces, enhancing penetration and cutting efficiency.
Implementation Method 1
a biasing element joined with the ferrule that engages the retention arm to assist in retaining the cutting blade in the retracted mode
Implementation Method 2
The cutting blade can include a lever arm that can be impacted to allow the cutting blade to pivot from the retracted mode to the deployed mode
Data Source
AI summary
A broadhead is provided including a ferrule defining a slot. A blade is movable within the slot from a retracted mode to a deployed mode. The blade includes a lever arm projecting from the slot on a ferrule side opposite a cutting edge. The blade can include an interference projection that engages an exterior of the ferrule to retain the blade in the retracted mode. The blade can include a retention arm that selectively engages the ferrule to hold the blade in the retracted mode or the deployed mode. The broadhead can include a collar selectively disposed in a collar recess of the blade to hold the blade in the retracted mode. The broadhead can include a plunger and/or pivotable pawl that selectively engage the blade to hold it in a desired mode.