Expandable Broadhead Blade Retention for Stable Flight
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Solution Overview
Problem
Existing expandable broadheads suffer from mechanical failures leading to inaccurate deployment, non-reusability, and increased complexity, which affects flight stability and reliability.
Innovation Solution
A broadhead design featuring a spring-loaded retaining mechanism that maintains blade members in a retracted position during flight and allows for easy deployment upon impact, with a pin and plunger system ensuring blades transition to an expanded position upon target contact, and a retaining member for reusability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a spring-loaded retaining mechanism is used to hold blade members in retracted position, then flight stability is improved, but device complexity increases
Solution Approach 1:
The broadhead employs a dynamic retaining mechanism where spring-loaded retaining members automatically transition between engaged and disengaged states based on impact conditions. During flight, the springs maintain blades in retracted position; upon impact, the blades rotate to deployed position automatically, providing adaptive stability without complex control systems
Solution Approach 2:
The retaining mechanism is self-regulating through the spring-loaded design that responds automatically to impact forces. The system requires no external control or complex mechanical linkages—the springs naturally engage and disengage based on the operational state, reducing overall device complexity while maintaining stability
2Measurement precision
If blade members are made expandable for accurate target penetration, then penetration accuracy is improved, but reliability decreases due to mechanical failures
Solution Approach 1:
The blade assembly is segmented into multiple independent blade members that can rotate and deploy independently upon impact. Each blade is retained separately by the spring-loaded retaining members, allowing individual blades to function independently and reducing the likelihood of complete mechanical failure
Solution Approach 2:
The spring-loaded retaining members are pre-loaded with compression springs that provide continuous retaining force during flight. This pre-loading ensures that the blades remain securely retained until impact, and the spring force is already prepared to immediately release and deploy the blades upon target contact, ensuring reliable and consistent deployment
3Reliability
If a retaining mechanism is used to prevent accidental deployment, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The retaining mechanism is designed to reset automatically through the spring-loaded system. After deployment, the blades return to their retracted position under spring force, and the retaining members automatically re-engage, providing self-resetting functionality that maintains reliability without requiring manual intervention or complex operation
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 provides improved flight stability by preventing accidental deployment, ensures accurate target penetration, and allows for multiple uses by facilitating easy reset and retraction of the blades.
Implementation Method 1
The spring-loaded retaining member includes a plunger and a spring. The plunger is configured to engage the notches of the blade members.
Data Source
AI summary
A broadhead includes a body, a blade member, and a plunger. The body defines a target penetrating end. The blade member is positioned partially within an inner volume of the body. The blade member is configured to rotate and translate relative to the body by a pin that is fixedly coupled with the body being received through a slot of the blade member. The blade member is transitionable between a retracted position and a deployed position. The plunger is bias by a spring in a longitudinal direction towards the target penetrating end. The plunger is configured to be received within a recess of the blade member when the blade member is in the retracted position.