Bowfishing Arrowhead Barb Release Mechanism
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Solution Overview
Problem
Existing bowfishing arrowheads require complete separation of the arrow tip to fold forward barbs for fish removal, risking tip loss during retrieval.
Innovation Solution
A bowfishing arrowhead design with a shortened stop surface and offset barb arm allows barbs to rotate forward with minimal loosening of the arrow tip, preventing interference and allowing fish removal without completely separating the tip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the arrow tip is completely separated from the arrowhead to fold forward barbs for fish removal, then the barbs can be fully extracted from the fish, but the arrow tip is at risk of being dropped or misplaced during retrieval
Solution Approach 1:
The patent applies partial action by allowing the barbs to rotate only partially forward (enough to extract the fish) without requiring complete separation of the tip. The shortened stop surface enables the barbs to achieve sufficient forward rotation while the tip remains attached to the arrowhead, eliminating the risk of tip loss while still allowing effective fish removal.
2Strength
If a threaded connection permanently attaches the arrowhead to the arrow shaft, then the arrowhead remains securely attached, but the barbs cannot be folded forward to extract the arrow from the fish
Solution Approach 1:
The patent segments the attachment system into two distinct functional components: a permanent threaded connection between the arrowhead body and arrow shaft (providing strong attachment), and a movable threaded connection between the tip and arrowhead body (allowing controlled loosening). This segmentation enables the barbs to rotate forward when the tip is slightly loosened, while maintaining secure attachment of the arrowhead to the shaft.
Solution Approach 2:
The patent introduces dynamics by making the tip-to-arrowhead connection adjustable rather than fixed. The threaded coupling allows the tip to be loosened to a specific degree, transforming the static permanent attachment into a dynamic system where the degree of attachment can be modified to enable barb rotation while maintaining overall structural integrity.
3Reliability
If the stop surface on the barb is lengthened to prevent forward rotation, then the barbs remain secured during retrieval, but the barbs cannot be folded forward to remove the fish
Solution Approach 1:
The patent changes the critical parameter of stop surface length. By shortening the stop surface on the barb, the patent enables the barbs to rotate forward with only minor tip loosening, sufficient for fish removal while keeping the tip attached. This parameter change transforms the system from one requiring complete tip separation to one where partial rotation is achievable.
4Device complexity
If the barb arm is positioned without offset, then the structure is simpler, but the barb interferes with the arrow tip when attempting to rotate forward
Solution Approach 1:
The patent introduces asymmetry through the offset position of the barb arm relative to the arrow tip. The barb arm is positioned at an offset distance that creates an asymmetric configuration, allowing the barb to rotate forward along a path that clears the tip. This asymmetric positioning resolves the interference problem while maintaining structural simplicity.
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
Enables secure retention of the arrow tip during fish extraction, reducing the risk of loss and minimizing the necessary loosening, while maintaining a robust stop mechanism.
Implementation Method 1
The arrow barb may include an eye portion attached to an arm portion, the eye portion having a hole about which the arm portion pivots
Implementation Method 2
The first end of the arrowhead body may attach to an arrow shaft that may extend rearwardly from the arrowhead body along the arrow axis and a second end may provide a threaded coupling extending along the arrow axis to receive an arrow tip. The arrow tip may be threaded onto the arrowhead body to be movable by rotation between a tightened and loosened position
Implementation Method 3
The offset may displace a front edge of the arm portion from the center of the hole by a distance at least equal to a radial distance between the rear edge of the arrow tip and the center of the hole measured perpendicular to the arrow axis
Data Source
AI summary
An arrowhead for bowfishing supports pivoting barbs that may refracted rearward to pass through a fish and then extended to retain the fish on the arrow. The barbs provide a truncated stop surface striking a rear of the arrow tip when the arrow tip is tightened on the arrowhead to prevent their forward motion from the extended position when the tip is tightened on the arrowhead and yet to allow such motion when the tip is slightly loosened but not removed. The barbs are offset with respect to their pivot point so that a slight loosening of the arrow tip also allows the barbs to pass forward over the arrow tip for retraction of the fish from the arrow while the tip is retained on the arrowhead.