Magnet-Retained Expandable Broadhead for Accurate Arrow Flight
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing archery broadheads with deployable blades often sacrifice aerodynamic efficiency and accuracy due to blades extending outside the ferrule, risking damage to equipment and requiring larger storage space.
Innovation Solution
A broadhead design featuring pivotably coupled blades with a magnet disposed within the member, allowing blades to remain retracted during flight and deploy upon impact, utilizing cutout regions to minimize blade spacing and maintain a compact profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If blades are extended outside the ferrule for cutting capability, then cutting performance is improved, but aerodynamic efficiency deteriorates
Solution Approach 1:
The broadhead employs deployable blades that can transition between retracted and extended positions. During flight, blades remain retracted inside the ferrule to maintain aerodynamic efficiency. Upon impact, the blades deploy outward to provide cutting capability. This dynamic transformation resolves the contradiction by having the blades in different states during different phases of use.
Solution Approach 2:
The broadhead is divided into separate functional components: the ferrule (body) and the deployable blades. The blades are mechanically coupled to the ferrule through pivot points, allowing them to be segmented from the main body during deployment. This segmentation enables the blades to be stored compactly within the ferrule during flight while still being accessible for cutting when needed.
2Strength
If blades are extended outside the ferrule for cutting capability, then cutting performance is improved, but accuracy deteriorates
Solution Approach 1:
The blades transition from a retracted state during flight to an extended state upon impact. During the critical flight phase, the blades remain concealed within the ferrule, presenting a streamlined profile that flies true and accurately. The cutting blades only extend when the broadhead has already reached the target, eliminating any negative impact on flight accuracy.
3Strength
If blades are extended outside the ferrule for cutting capability, then cutting performance is improved, but risk of equipment damage increases
Solution Approach 1:
The deployable blade mechanism ensures that blades remain retracted during normal handling and flight, minimizing the risk of accidental contact with equipment such as the bowstring, arrow rest, or quiver. The blades only extend upon impact with the target, when their cutting function is actually needed, thereby reducing the overall risk of equipment damage throughout the archery process.
4Strength
If blades are extended outside the ferrule for cutting capability, then cutting performance is improved, but storage space requirement increases
Solution Approach 1:
The deployable blades are designed to nest within the ferrule when not in use. The blades fold or retract into the hollow interior of the ferrule, utilizing the existing internal volume of the broadhead body. This nesting arrangement allows the cutting blades to be stored compactly without significantly increasing the overall dimensions of the broadhead, thereby minimizing storage space requirements while maintaining full cutting capability when deployed.
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
Enhances aerodynamic efficiency, improves accuracy, reduces risk of equipment damage, and allows for more compact storage by keeping blades concealed until deployment.
Implementation Method 1
The magnet is at least partially disposed within the member. The magnet has a longitudinal axis extending perpendicular to the plane. The first blade can contact the magnet in a first configuration. The first blade and the second blade can be displaced from the magnet in a second configuration.
Implementation Method 2
The magnet can be diametrically magnetized. The first blade is pivotable about an axis of rotation. The second blade can be pivotable about the axis of rotation. The axis of rotation can extend parallel to the longitudinal axis.
Data Source
AI summary
A broadhead for an archery bow. The broadhead includes a member, a first blade, a second blade, and a magnet. The first blade and the second blade are coupled to the member. The first blade and the second blade form a plane. The magnet is at least partially disposed within the member. In some examples, the magnet has a longitudinal axis extending perpendicular to the plane. In some examples, each of the first and second blades have respective cutout regions interfacing the magnet while the broadhead is in a first configuration and/or a second configuration.