Arrowhead Assembly with Over-the-Shaft Sleeve
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Solution Overview
Problem
Traditional arrowhead mounting configurations require high concentricity tolerance to maintain arrow alignment during flight and can result in damaged shafts upon impact, and lack efficient securement and replaceability of blades.
Innovation Solution
An arrowhead assembly with individually removable blades that overlap the exterior of the arrow shaft, featuring a compression collet for radial clamping and automatic centering, and an over-the-shaft sleeve with expandable blades for enhanced securement and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional arrowhead mounting configuration is used with insert glued into arrow shaft interior, then arrowhead can be secured to arrow shaft, but high concentricity tolerance is required to maintain arrow alignment during flight
Solution Approach 1:
The patent introduces an over-the-shaft sleeve as an intermediary component that spans across the arrow shaft exterior. This sleeve provides external support and centering for the arrowhead, eliminating the need for high concentricity in the internal insert mounting. The sleeve acts as a mediator between the arrowhead and shaft, distributing loads and maintaining alignment without requiring precise internal fit-up.
Solution Approach 2:
The invention transitions from relying solely on internal concentricity (one-dimensional internal fit) to utilizing external dimensional control through the over-the-shaft sleeve. The sleeve provides centering in the radial dimension externally, allowing the internal insert to have relaxed tolerance requirements while maintaining overall arrowhead alignment.
2Reliability
If traditional insert mounting is used, then arrowhead can be secured, but arrow shaft can be damaged when hard objects are impacted by the arrowhead
Solution Approach 1:
The over-the-shaft sleeve provides beforehand cushioning by distributing impact forces across a larger area of the arrow shaft before they reach the shaft interior. The sleeve acts as a protective barrier that absorbs and disperses shock loads from hard object impacts, preventing concentrated forces that could damage the shaft structure or compromise the insert mounting.
Solution Approach 2:
The sleeve serves as a protective intermediary between external impact forces and the arrow shaft interior. It mediates the transmission of impact forces, converting concentrated point loads into distributed area loads that the shaft can better withstand, thereby protecting the shaft structural integrity.
3Ease of repair
If blades are permanently fixed in arrowhead, then structural integrity is maintained, but blades cannot be replaced when worn or damaged
Solution Approach 1:
The patent segments the arrowhead into replaceable blade components and a retained sleeve body. The blades are designed as separate, individually replaceable segments that can be removed and replaced without affecting the main sleeve structure or requiring replacement of the entire arrowhead assembly. This segmentation enables easy maintenance while maintaining secure attachment during use.
Solution Approach 2:
The blade retention system incorporates dynamic characteristics, allowing blades to be securely held during flight but easily removable when needed. The retention mechanism provides variable securement - strong during normal operation but easily released for maintenance, enabling the system to transition between operational and maintenance states.
4Reliability
If compression collet is used to radially clamp arrow shaft, then securement is improved, but device complexity increases
Solution Approach 1:
The over-the-shaft sleeve performs multiple functions simultaneously: it provides structural support for the arrowhead, centers the assembly, protects the shaft from impacts, and works with the compression collet for securement. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in overall device complexity despite adding the collet mechanism.
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
The solution ensures accurate arrow flight by minimizing concentricity issues and provides secure, replaceable blades, enhancing the structural integrity of the arrowhead assembly and reducing the likelihood of shaft damage upon impact.
Implementation Method 1
a compression collet or other retention structure that is clamped about the exterior of the arrow shaft. In certain embodiments, the retention structure radially clamps the arrow shaft.
Implementation Method 2
expandable blades pivotally connected to the over-the-shaft sleeve
Data Source
AI summary
An arrowhead assembly and a method for assembling an arrowhead are provided. The arrowhead of the disclosure is secured to an inside portion of the arrow shaft and the outside portion of the arrow shaft. In some embodiments the arrow tip threads into an insert that is secured within the tip of the arrowhead. Also, in some embodiments, a sleeve extends over the end of the arrow shaft and is radially compressed onto the shaft.