Broadhead with Elastic O-Ring Retention for Stable Flight
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Solution Overview
Problem
Existing expandable broadheads require retaining members to keep blades in place during flight, which can affect accuracy and require complex deployment mechanisms, and typically have shorter blades that may not provide sufficient cutting length.
Innovation Solution
A broadhead design with blades that are pivotally attached and retained by a rubber o-ring in a closed position during flight, deploying quickly upon impact by contact with the target, allowing the blades to extend and pivot rearward without a traditional retaining member, and featuring blades that are longer and configured to deploy on opposite sides of the arrowhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If retaining members are used to keep blades in place during flight, then blade stability is improved, but device complexity and flight accuracy are worsened
Solution Approach 1:
The patent removes traditional retaining members (screws, set screws, or other mechanical retention devices) from the broadhead structure. Instead, the blades are held in the closed position solely by the elastic force of a rubber O-ring that engages with the blade structure, eliminating complex retention mechanisms while maintaining blade stability during flight.
Solution Approach 2:
The rubber O-ring provides self-contained elastic retention force to hold the blades closed during flight without requiring external retaining members. The blade structure itself works with the O-ring to maintain the closed position, and the same blade geometry that provides cutting function also enables the deployment mechanism upon target contact.
2Stability of the object's composition
If retaining members are used to secure blades during flight, then blade retention is improved, but flight accuracy is worsened
Solution Approach 1:
Traditional retaining members that protrude into the flight path or create turbulence are completely removed. The rubber O-ring retains blades through elastic engagement without interfering with the aerodynamic profile, thus maintaining flight accuracy while securing blades during flight.
Solution Approach 2:
The rubber O-ring acts as a flexible elastic element that conforms to the blade structure, providing retention force without creating rigid protrusions or disruptions to the aerodynamic flow. This flexible retention method preserves the streamlined profile needed for accurate flight.
3Stability of the object's composition
If traditional retaining members are used, then blade security is improved, but deployment speed is worsened
Solution Approach 1:
Mechanical retaining members that require threading, unscrewing, or complex disengagement mechanisms are removed. The simple elastic O-ring allows blades to be released instantly upon target contact, enabling rapid deployment without the delay of mechanical retention system disengagement.
Solution Approach 2:
The elastic O-ring allows the blades to transition directly from the retained closed position to the deployed open position upon target contact, skipping any intermediate retention disengagement steps. The stored elastic energy in the O-ring provides immediate force for blade deployment, achieving rapid transition.
4Shape
If shorter blades are used, then aerodynamic profile is improved, but cutting length is worsened
Solution Approach 1:
The blades are designed to be long but remain in a retracted closed position during flight, presenting a compact aerodynamic profile. Upon target contact, the blades deploy to their full extended length, providing maximum cutting length. This dynamic configuration allows both short profile during flight and long cutting surface during deployment.
Solution Approach 2:
The long blades are nested within or alongside the broadhead body in the closed position, concealing their full length to maintain a compact aerodynamic profile. When deployed, the blades extend outward to their full length, providing maximum cutting capability while having appeared compact during flight.
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
This design enhances flight accuracy and stability by eliminating the need for retaining members and allows for rapid, reliable blade deployment, achieving larger cutting lengths and more humane kills with improved aerodynamics and penetration.
Implementation Method 1
The blades are pivotally attached and retained by a rubber o-ring in a closed position during flight
Implementation Method 2
deploying quickly upon impact by contact with the target, allowing the blades to extend and pivot rearward
Data Source
AI summary
A broadhead arrowhead has blades that deploy when the arrowhead penetrates a target. The blades extend after the arrowhead has penetrated the target a sufficient distance for a lead edge of the blade to contact the wound made in the target. Before and during flight the extendable blades are held in a retracted position by frictional engagement with a retaining element that remains attached to the arrowhead. The configuration of the extendable blades provides a stable profile when the arrowhead is in flight.