Hunting Arrow Point With Pivot Stops And Screw Fasteners
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Solution Overview
Problem
Lightweight cantilevered blade arrow points used in bow hunting for game birds are prone to damage and have insecure attachment mechanisms, leading to blade loss and complex assembly processes.
Innovation Solution
A game bird killing arrow point featuring a ferrule with radially outwardly opening helically threaded screw receiving apertures and pivot stops, allowing for secure and interchangeable attachment of lightweight blades using screw and eye fasteners, with a design that minimizes weight and wind resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If lightweight cantilevered blade arrow points are used to reduce weight, then the weight of the arrow point is reduced, but the blades become easily damaged and insecurely attached
Solution Approach 1:
The arrow point is divided into separate components: a ferrule body, multiple individual blades, screw fasteners, and pivot stops. This segmentation allows each component to be optimized independently - the blades remain lightweight while the ferrule and fastening system provide secure attachment through distributed mechanical engagement points.
Solution Approach 2:
The invention combines multiple attachment functions into a single integrated ferrule structure that incorporates both screw receiving apertures and pivot stops. This merging of functions into one component eliminates the need for separate attachment mechanisms, improving reliability while maintaining lightweight construction.
2Area of stationary object
If cantilevered blade arrangement is used to increase effective target size, then the effective target size is increased, but the assembly and disassembly process becomes mechanically complex
Solution Approach 1:
The cantilevered blade arrangement is segmented into individual blades that can be independently attached and detached. Each blade is secured through a simple screw fastening mechanism aligned with receptacles in the ferrule, allowing easy assembly and disassembly without complex mechanical procedures.
Solution Approach 2:
The ferrule body is designed with self-aligning features where the screw receiving apertures and pivot stops automatically position themselves relative to the blade mounting locations. This self-alignment eliminates the need for complex alignment procedures and simplifies the assembly process while maintaining the cantilevered blade configuration for increased target size.
3Weight of moving object
If lightweight blades are used to reduce weight, then the weight is reduced, but the blades are easily damaged and require replacement
Solution Approach 1:
The blade assembly is segmented into replaceable individual blades that can be independently removed and replaced. The standardized screw fastening interface allows damaged blades to be quickly swapped out without affecting the integrity of the ferrule or other components, facilitating easy repair while maintaining lightweight construction.
Solution Approach 2:
The design accepts that lightweight blades may be damaged during use and facilitates their replacement through the simple screw fastening system. The ferrule body serves as a reusable component that can retain multiple blade replacements, while the individual blades can be discarded or recovered as needed.
4Device complexity
If simple attachment mechanism is used to facilitate blade replacement, then the assembly is simplified, but the blades may fall off and be lost
Solution Approach 1:
The attachment mechanism merges two functions into one integrated system: the screw fastening provides secure mechanical attachment while the pivot stops prevent blade dislodgement. This combined approach maintains simplicity in the overall design while ensuring reliable blade attachment that prevents loss.
Solution Approach 2:
The pivot stops act as intermediary elements between the blade and the ferrule body. These stops engage with the blade's proximal end to prevent it from pivoting or dislodging, while the screw fastener provides the primary attachment function. This intermediary mechanism ensures blade security without complicating the overall attachment system.
Data Source
AI summary
A hunting arrow point having a ferrule having a forward nose, a rearward shank, and a body, the body having a plurality of radially outwardly opening apertures; the point further having blades, each blade having a proximal end, a distal end, a forward end, and a rearward end, each proximal end having an eye, each blade's forward end having a sharpened edge, each blade being positioned so that its eye aligns over one of the ferrule's apertures; the point receiving screws, each screw extending through one of the blade's eyes and engaging one of the ferrule's apertures; and the point presenting a plurality of pivot stops, each pivot stop being fixedly attached to or formed wholly with the ferrule, each pivot stop being positioned for biasing against one of the blades upon application of a rearwardly directed force to the blade.