Self-Locking Broadhead Blade Retention Mechanism
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Solution Overview
Problem
Existing expanding broadheads face challenges in maintaining blades in a retracted position during flight and ensuring reliable deployment upon impact, often resulting in unintended slipping or failure to expand effectively.
Innovation Solution
A self-locking broadhead design featuring a blade retention system with a spring member and locking lugs, where the spring must be deflected to secure the blade in the retracted position, and a ramp angle on the locking surface prevents unintentional release during flight while allowing deployment upon target contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring member and locking lugs are used to secure the blade in the retracted position, then the blade remains securely retracted during flight, but the device complexity increases
Solution Approach 1:
The spring member automatically engages with the locking lugs to secure the blade in the retracted position without requiring external intervention. The system uses the natural spring force and geometric locking to maintain blade retention, eliminating the need for additional actuators or complex control mechanisms.
Solution Approach 2:
The blade retention system is divided into distinct functional components: the spring member for applying retaining force, the locking lugs for geometric constraint, and the ramp surface for controlled deployment. This segmentation allows each component to be optimized independently while maintaining overall system reliability.
2Reliability
If a ramp angle is provided on the locking surface, then unintentional release during flight is prevented, but the deployment mechanism becomes more complex
Solution Approach 1:
The ramp angle on the locking surface creates a geometric constraint that prevents the blade from unintentionally releasing during flight. The angled surface opposes any force that might cause premature deployment, ensuring the blade remains locked until intentional deployment forces are applied.
3Ease of operation
If the spring member must be deflected to secure the blade, then controlled deployment upon impact is enabled, but the force required for deployment increases
Solution Approach 1:
The spring member provides a dynamic retaining force that can be deflected to allow blade deployment. Upon target impact, the forces generated exceed the spring's retaining force, causing controlled deflection and subsequent blade deployment. This dynamic system allows the blade to remain secured during flight while enabling reliable deployment when needed.
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 blades remain securely retracted during flight and deploy reliably upon impact, enhancing penetration and preventing barbing effects during retrieval.
Implementation Method 1
a first contact surface on an integral spring member configured to bear against a first blade locating feature
Implementation Method 2
a second contact surface on the blade configured to bear against a second blade locating feature, wherein the integral spring member and the blade must be deflected or compressed for the blade to be placed in the retracted position
Implementation Method 3
two lugs traversing the slot substantially perpendicular to a longitudinal axis of the broadhead body
Data Source
AI summary
Designs and methods are provided for a retractable broadhead blade. In one exemplary embodiment the broadhead blade is configured to be received in a slot in a broadhead body, and moveable between a retracted or in-flight position, and a deployed or target penetrating position. The broadhead blade includes a front end that faces substantially forward when the blade is in the retracted position, a distal end opposite the front end, an outward facing sharpened leading edge between the front end of the blade and the distal end, and an inward facing trailing edge opposite the leading edge. The blade further includes an integral spring member with a contact surface configured to bear against a blade locating portion of a broadhead body when the blade is in the retracted, or in-flight position.