Broadhead Blade Movement Resistance System for Nonbarb Compliance
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Solution Overview
Problem
Conventional mechanical broadheads require blades to be closed during flight and open upon impact, leading to increased material usage and aerodynamic resistance, while also posing challenges for easy removal from targets and compliance with nonbarb regulations.
Innovation Solution
A broadhead design with movable blades that remain in an open position during flight and transition into a nonbarb retraction position upon extraction, utilizing a blade movement resistance system to maintain the blades' open configuration during shooting and facilitate easy removal, allowing for reduced material usage and compliance with regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If blades are closed during flight and open upon impact (conventional mechanical broadhead design), then cutting effectiveness is improved, but material usage increases and aerodynamic resistance increases
Solution Approach 1:
The broadhead employs movable blades that can dynamically change position between open and closed configurations. During flight, blades remain open to reduce material and improve aerodynamics; upon impact, blades close to enhance cutting effectiveness. This dynamic adaptation resolves the contradiction by allowing the structure to optimize for different operational phases.
Solution Approach 2:
The broadhead changes its geometric parameters (blade position, cutting diameter) based on operational conditions. The blades transition from an open position with larger cutting diameter during flight to a closed position with smaller profile upon impact, allowing the same structure to satisfy both material reduction and cutting effectiveness requirements under different conditions.
2Object-affected harmful factors
If blades are closed during flight (conventional mechanical broadhead design), then aerodynamic resistance is reduced, but material usage increases
Solution Approach 1:
The movable blades enable the broadhead to maintain an open configuration during flight, reducing the overall material volume required compared to conventional closed-blade designs. The dynamic capability allows the structure to be optimized for aerodynamics during flight while still providing sufficient material for cutting upon impact.
3Quantity of substance
If blades are in open position during flight, then material usage is reduced and aerodynamic resistance is minimized, but blade stability during flight may be compromised
Solution Approach 1:
The broadhead utilizes a resistance system that provides controlled friction to maintain blade stability during flight while allowing movement upon impact. The resistance elements create sufficient friction to prevent unwanted blade movement during aerodynamic flight conditions, yet allow the blades to close when impacted by a target.
Solution Approach 2:
The resistance system uses friction-based elements that replicate the stabilizing effect of conventional fixed blades during flight, while allowing the movable blades to achieve the material and aerodynamic benefits of an open configuration. The friction resistance effectively 'copies' the stability function without requiring the blades to be closed.
4Strength
If conventional mechanical broadhead design with closed blades is used, then cutting effectiveness is improved, but ease of removal from target is worsened
Solution Approach 1:
The movable blades automatically transition from open to closed position upon impact, providing cutting effectiveness similar to conventional designs. After the animal is killed and the broadhead is removed from the carcass, the blades can be manually opened to reduce the cutting diameter, making removal easier and less painful for the animal.
5Strength
If blades form acute angle with broadhead body (conventional design), then cutting effectiveness is improved, but compliance with nonbarb regulations is worsened
Solution Approach 1:
The broadhead uses movable blades that can change their angular orientation relative to the broadhead body. During flight and cutting, the blades are positioned at an acute angle for effective cutting. Upon removal, the blades can be rotated to a nonbarb position where the proximal edge faces away from the broadhead body at an obtuse angle, complying with nonbarb regulations while maintaining cutting effectiveness when needed.
Data Source
AI summary
A broadhead having at least one movable blade capable of moving between shooting and retraction positions is disclosed. In at least one embodiment, the broadhead may include a plurality of movable blades. The broadhead may include a blade movement resistance system configured to retain the blades in a shooting position while being shot and enable to blades to rotate forward into a retraction position during retraction into a nonbarb position to enable the broadhead to be easily removed from a target or animal. A nonbarb position is one in which the proximal edge of the blade does not form an acute angle with the broadhead or arrow but faces away from the broadhead body or arrow at an obtuse angle.