Tactical Knife Blade Grind Segmentation and Lanyard Design
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Solution Overview
Problem
Existing knife blades face challenges in maintaining sharpness and structural integrity during sharpening, and prior safety lanyards are inefficient in preventing hand slippage during use.
Innovation Solution
A tactical knife with a blade configuration featuring four converging surfaces including concave, angled, and flat segments for enhanced strength and sharpness, and a dual-attachment safety lanyard with an optional thumb plate to secure the hand to the handle, preventing forward slippage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a hollow concave grind is used on the blade, then sharpness is improved, but the edge becomes fragile and prone to breaking
Solution Approach 1:
The blade edge is segmented into multiple surfaces (first through fourth surfaces) with different grind profiles. The first and second surfaces have a hollow concave grind for sharpness, while the third and fourth surfaces have a convex grind for strength. This segmentation allows different portions of the blade to have optimized properties for their specific functions.
Solution Approach 2:
Different regions of the blade are given different local qualities through varied grind profiles. The cutting edges (first and second surfaces) receive a hollow concave grind for maximum sharpness, while the spine and tip regions (third and fourth surfaces) receive a convex grind for enhanced strength and durability. Each local region is optimized for its specific functional requirement.
2Strength
If a straight grind is used on all four surfaces, then spine strength is improved, but sharpness is sacrificed
Solution Approach 1:
The blade is divided into segments with different grind types. The third and fourth surfaces maintain a straight grind for spine strength, while the first and second surfaces feature a hollow concave grind for sharpness. This segmentation resolves the contradiction by applying different grind profiles to different functional zones of the blade.
Solution Approach 2:
The spine region is given a straight grind for structural strength, while the cutting edge regions are given a hollow concave grind for sharpness. Each local area of the blade has a grind profile specifically optimized for its functional requirements, allowing both strength and sharpness to coexist.
3Manufacturing precision
If repeated sharpening is performed, then the cutting edge can be restored, but the material behind the edge thickens and performance decreases
Solution Approach 1:
The blade geometry is segmented into multiple surfaces that can be independently maintained. When sharpening is required, only the first and second surfaces need to be addressed, while the third and fourth surfaces maintain their original geometry. This segmentation allows for more precise sharpening that removes less material overall.
Solution Approach 2:
The hollow concave grind on the first and second surfaces creates a geometry where sharpening can be performed with minimal material removal from the spine area. The convex grind on the third and fourth surfaces preserves material in critical strength zones, allowing the blade to be sharpened multiple times while maintaining both sharpness and structural integrity.
4Device complexity
If a traditional single-point lanyard attachment is used, then the design is simple, but it is inefficient in preventing hand slippage
Solution Approach 1:
The lanyard system is segmented into multiple attachment points distributed along the handle rather than a single attachment point. This segmentation creates multiple constraint zones that work together to prevent hand slippage from different directions and forces.
Solution Approach 2:
The lanyard attachment system transitions from a single-point (0D) or line (1D) constraint to a distributed multi-point system that creates a two-dimensional constraint plane around the user's hand. This dimensional expansion provides more comprehensive hand retention and control.
Data Source
AI summary
The knife includes a handle portion attached to a blade with a tip at its distal end. The blade comprises four surfaces that converge to form a spine and opposing cutting edges with each surface having a concave segment, a first angled segment, a flat segment, and a second angled segment as the surface extends from the spine to the edge. Similarly, the tip includes four surfaces that converge and terminate at a point, with each surface comprising only an angled segment. Optionally, the knife includes a unique safety lanyard that has two attachment points on the handle such that a closed loop is adjustably formed around the user's hand when gripping the handle, which aids in withdrawing the knife, stabilizing the user's grip, and preventing the hand from sliding forward while in use. Optionally, the knife includes a thumb plate as an additional safeguard.