Pivoting Broadhead Blade Assembly with Adjustable Collar
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Solution Overview
Problem
Conventional pivoting blade broadheads face issues such as layered blade designs leading to increased complexity and drag, slower deployment, and the inability to adjust cutting diameter without replacing the entire broadhead.
Innovation Solution
A broadhead design featuring pivoting blades that avoid layering by rotating in a plane parallel to the central axis, with a socket and disk connection to minimize drag, and a collar system allowing adjustable cutting diameter through selective channel alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If blades are sized such that they need to be layered on one another, then the sweeping area is increased, but the deployment time increases and relative blade tip speeds decrease
Solution Approach 1:
The patent transitions from a stacked blade arrangement (one-dimensional layering along the shaft) to a radial arrangement where blades pivot outward from a central hub in a planar motion. This dimensional change allows blades to achieve a large sweeping area without layering, as each blade operates in its own radial plane rather than being stacked along the arrow shaft axis.
2Area of moving object
If blades are layered upon one another, then the sweeping area is increased, but the design complexity increases
Solution Approach 1:
The patent divides the blade assembly into discrete, independently pivoting blade units that attach to a central hub. Each blade is a separate segment that can rotate independently, eliminating the need for complex layered structures. This segmentation simplifies the overall design while maintaining the ability to create a large sweeping area through the coordinated motion of multiple simple segments.
3Device complexity
If a singular pin-like connection is used to connect blades to the main body, then the structure is simplified, but drag is created during penetration
Solution Approach 1:
The patent introduces a trailing arm as an intermediary component between the blade and the main body. Instead of directly attaching the blade to the main body with a simple pin (which creates drag), the trailing arm provides a smooth, extended connection that reduces resistance during penetration. The trailing arm acts as a mediator that maintains the blade's connection to the system while minimizing harmful drag forces.
4Manufacturing precision
If pivoting blades are designed to sweep outward to a particular angle and distance, then the cutting diameter is fixed, but the adaptability to different cutting requirements is reduced
Solution Approach 1:
The patent makes the cutting diameter adjustable by allowing the blade pivot angle and deployment distance to be variable rather than fixed. The blade can be positioned at different angles relative to the shaft and can pivot through different arcs, enabling the cutting diameter to be dynamically adjusted according to hunting requirements. This dynamic configuration allows a single broadhead to adapt to various cutting needs without requiring multiple different broadhead designs.
Data Source
AI summary
A broadhead assembly including a main body, a pivoting blade, a trailing arm, and a collar, so as to permit the selection of multiple cutting diameters. The blade is coupled to the main body proximate to the tip. The blade is configured to pivot about an axis in communication with the main body to operate between a first position and a second position. The blade includes a socket along a trailing edge. A trailing arm extends between the main body and the blade and has a disc for insertion into the socket. The collar selectively regulates rotation of the trailing arm and therefor the pivoting of the blades so as to vary the cutting diameter. The collar is configured to include channels of different depths and slopes and restricts rotation of the trailing arm by particular alignment of the trailing arm with a particular set of channels.