Expanding Broadhead Barb Mechanism for Weight Reduction
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Solution Overview
Problem
Existing expanding broadheads are heavy and complex, which can hinder their effectiveness and efficiency in hunting applications.
Innovation Solution
The design includes a lightweight shank base with a razor tip, expanding barb units, and retention rings, where the barb elements unfold upon contact with the target, acting as multiple small knives to cut through meat efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional expanding broadhead designs are used, then cutting effectiveness is improved, but weight and structural complexity increase
Solution Approach 1:
The broadhead is divided into modular components: a shank base, multiple independent barb units (each with its own base ring and barb elements), retention rings, and a razor tip. Each barb unit can be independently manufactured and assembled, allowing weight optimization while maintaining cutting effectiveness through the distributed barb structure.
Solution Approach 2:
The barb elements are extracted from a solid block construction and formed as separate, thin-walled tubular structures with hollow interiors. This extraction of material while preserving the cutting function (barb elements with sharp edges) significantly reduces weight while maintaining the ability to cut through meat effectively.
2Object-affected harmful factors
If traditional expanding broadhead designs are used, then cutting effectiveness is improved, but structural complexity increases
Solution Approach 1:
The complex cutting function is segmented into multiple simple barb units, each containing only basic elements (base ring, barb elements, retention ring). This segmentation distributes the complexity across identical, simple modules rather than requiring a single complex structure, making the overall design easier to manufacture and assemble.
Solution Approach 2:
The barb elements are nested within tubular structures with hollow interiors, and the entire barb unit is retained within the shank base structure. This nesting arrangement consolidates multiple components into compact, space-efficient configurations, reducing structural complexity while maintaining the expanding cutting function.
3Weight of moving object
If barb elements are made thin-walled to reduce weight, then weight decreases, but structural strength may be compromised
Solution Approach 1:
The barb elements are constructed from thin-walled tubular structures that utilize the high strength-to-weight ratio of tubular geometries. The tubular form with hollow interior provides structural strength comparable to solid structures but with significantly reduced weight, while the thin walls are sufficient to maintain sharp cutting edges.
Solution Approach 2:
The barb elements feature curved, tubular geometries rather than straight solid forms. The curved tubular structure provides inherent structural strength through its geometry while minimizing material usage, allowing the barb elements to be both lightweight and strong enough to penetrate and cut through meat effectively.
Data Source
AI summary
An expanding broadhead preferably includes a shank base, a razor tip, at least one expanding barb unit, a rear retention ring and a front retention ring. An arrow shaft shank extends from one end of the shank base and a tip slot formed in an opposing end to receive the razor tip. Each expanding barb unit preferably includes two barb elements that extend from a base ring. Each barb element preferably includes a lengthwise barb base, a first set of opposing barbs, a second set of opposing barbs and opposing bulges. The two lengthwise barb bases are bent to obtuse angles. The base ring of the expanding barb unit is bent into a substantially semi-circular shape. The rear retention ring is forced over the base ring to retain thereof on the base shank. The front retention ring is stretched and placed over the at least two barb elements.