Arrow Tip O-Ring Groove Depth for Concentric Alignment
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Solution Overview
Problem
Existing archery arrow tips face issues with dynamic forces and inconsistent alignment due to non-concentric alignment of the neck and threads with the arrow insert, leading to accuracy and stability problems.
Innovation Solution
The arrow tip design incorporates front and rear O-rings with a depth of at least 50% of their cross-sectional thickness, positioned on the neck, to ensure concentric alignment within the arrow insert, preventing loosening and vibration by compressing the O-rings, which have a diameter equal to or greater than the insert's inside diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the arrow tip is screwed into the arrow insert without concentric alignment features, then the assembly process is simple, but the alignment between the neck and threads with the arrow insert is inconsistent, leading to accuracy problems
Solution Approach 1:
The patent introduces O-rings as intermediary elements between the arrow tip and arrow insert. These O-rings serve as alignment mediators that force concentric positioning when compressed, solving the alignment precision problem without requiring complex machining of the arrow tip itself. The O-rings act as a simple yet effective intermediary component that bridges the gap between the tip and insert alignment surfaces.
Solution Approach 2:
The alignment grooves are pre-formed in the arrow insert at specific positions and depths. These grooves perform the preliminary action of guiding and positioning the O-rings before the final tightening operation. By preparing the grooves in advance with precise dimensions (depth of at least 50% of O-ring thickness), the system ensures that alignment is established before full compression occurs, preventing misalignment issues.
2Reliability
If the O-ring groove depth is shallow (less than 50% of O-ring thickness), then the manufacturing is easier, but the O-rings can be pulled out of the grooves when the arrow point is inserted
Solution Approach 1:
The patent specifies a critical parameter threshold for groove depth: at least 50% of the O-ring cross-sectional thickness. This parameter change ensures that the groove is deep enough to provide adequate mechanical retention of the O-ring during insertion and use. By setting this specific depth requirement, the design achieves reliable O-ring retention while maintaining reasonable manufacturing feasibility, as the groove depth is directly proportional to O-ring dimensions rather than requiring absolute depth values.
3Reliability
If the O-ring compression force is increased to prevent loosening, then the arrow tip stability improves, but the risk of O-ring deformation or damage increases
Solution Approach 1:
The O-rings serve as cushioning elements that are pre-positioned in the grooves and compressed between the arrow tip base and the insert. This beforehand cushioning protects against excessive compression forces by allowing the O-rings to deform elastically and absorb shock, preventing direct transmission of high forces that could damage the arrow tip or insert threads. The O-rings act as a protective cushion that maintains anti-loosening capability while protecting structural integrity.
Solution Approach 2:
The patent utilizes O-rings as flexible elements to achieve the anti-loosening function. The flexibility of the O-ring material allows it to conform to the groove shape and maintain sealing contact under varying compression forces. This flexible approach provides reliable anti-loosening capability through friction and normal force without requiring rigid, high-stress connections that could cause damage. The O-ring's elastic properties enable it to accommodate compression while maintaining structural integrity.
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 arrow performance by ensuring precise concentric alignment and stability, preventing the arrow tip from loosening during use, thereby improving accuracy and consistency.
Implementation Method 1
The compression forces on the front O-ring and the rear O-ring that concentrically align the arrow point within the arrow insert
Implementation Method 2
The compression forces on the front O-ring and the rear O-ring that concentrically align the arrow point within the arrow insert also prevent the arrow point from vibrating loose within the arrow insert
Data Source
AI summary
An arrow point includes a tip portion, a neck portion, a threaded portion, a front O-ring, and a rear O-ring. The depth of the front O-ring groove and the rear O-ring groove are equal to a dimension that is at least 50% of the thickness of the cross section of front O-ring and rear O-ring. The grooves have a depth of at least 50% of the cross sectional thickness of the O-rings, the grooves contain the O-rings and prevent the O-rings from being pulled out of the grooves. The cross section diameter of the neck portion of the arrow point is less than the inside diameter of the arrow insert. The compression forces on the front O-ring and the rear O-ring that concentrically align the arrow point within the arrow insert also prevent the arrow point from vibrating loose within the arrow insert.