Rear Deploying Broadhead Impact Blade Deployment
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Solution Overview
Problem
Conventional broadheads with fixed blades suffer from wind resistance and drag, leading to reduced accuracy and velocity, while blade-opening designs are often complex and prone to mechanical failures or premature opening, and annular retaining rings are brittle and difficult to install.
Innovation Solution
A rear-deploying broadhead with a piston or plunger mechanism within the body, where blades are retracted and retained by an external latex coating during flight, deploying upon impact to maximize cutting surface area and minimize wind resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If blades are exposed in a fixed position, then cutting surface area is increased, but wind resistance and drag increase reducing accuracy and velocity
Solution Approach 1:
The broadhead blades transition from a static fixed position to a dynamic configuration that changes during flight. The blades are held retracted during flight to minimize wind resistance, then deploy upon target impact to maximize cutting surface area. This dynamic adjustment resolves the contradiction between needing large cutting area and minimizing aerodynamic drag.
Solution Approach 2:
The blades are prepared in a retracted position before flight to minimize wind resistance during the approach. The deployment mechanism is pre-loaded with springs that will automatically activate the blade deployment upon impact, ensuring the blades are in the optimal position for each phase of the arrow's trajectory.
2Area of moving object
If blade-opening designs are used to increase cutting surface area, then effectiveness is improved, but mechanical complexity increases leading to potential failures or premature opening
Solution Approach 1:
The deployment trigger mechanism is extracted from the broadhead body and replaced with a simple impact-activated system. Instead of complex mechanical triggers that could fail or activate prematurely, the design uses the impact force itself to compress the springs and deploy the blades, significantly reducing mechanical complexity while maintaining reliability.
Solution Approach 2:
The broadhead uses its own impact with the target to trigger blade deployment. The kinetic energy of the arrow automatically compresses the springs and releases the blades without requiring any additional sensing or control mechanisms. This self-activating system eliminates complex mechanical triggers and reduces the potential for failure.
3Reliability
If annular retaining rings are used to hold blades, then blade retention is achieved, but installation difficulty and brittleness increase
Solution Approach 1:
The mechanical annular retaining ring system is replaced with a spring-based retention mechanism. The springs provide continuous radial force to hold the blades in the retracted position during flight, while allowing easy installation by simply positioning the blades and letting the springs engage. This eliminates the brittleness and installation difficulty associated with rigid retaining rings.
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 enhances accuracy and velocity by reducing wind resistance and ensuring reliable blade deployment upon impact, maintaining effectiveness while simplifying installation and durability.
Implementation Method 1
The blades are retained in place by an external coating of latex or similar material
Implementation Method 2
The blades are retained in place by an external coating of latex or similar material
Implementation Method 3
Upon impact with the quarry, the blades deploy through the external coating
Data Source
AI summary
The present invention is a rear-deploying broadhead with an outer housing, an inner spine, and at least two blades pivotally attached to the inner spine, with the inner spine having a first end with a plunger end, and a second end which is pointed. The outer housing has a first closed end that terminates proximal the body to an arrow shaft and a second end which is open. The inner spine is shorter than the outer housing and disposed in the center of the outer housing, with the plunger end seated inside the outer housing adjacent the first end of the outer housing. The two blades are configured to deploy through the open lateral sides of the outer housing upon movement of the inner spine toward the end of the outer housing. The broadhead has an coating of latex until the broadhead impacts a target, at which point the blades deploy through the coating.