Knife Sheath Assembly with Threaded Ferrocerium Rod
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Solution Overview
Problem
Existing outdoor tools lack a convenient and integrated solution for starting fires, which is crucial for survival and emergency situations, as they typically require separate components like ferrocerium rods and knives.
Innovation Solution
A knife assembly with a sheath that includes a removable, threaded rod made of materials like ferrocerium, magnesium, and neodymium, allowing for easy mounting and dismounting to start fires, featuring a hexagonal shape for easy installation and a hard edge on the knife for generating sparks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate components (knife and fire starter) are used, then each component can be optimized for its specific function, but the overall system becomes more complex and requires multiple items to be carried
Solution Approach 1:
The patent combines the fire starter rod with the knife sheath by integrating a threaded mounting provision directly into the sheath structure. The ferrocerium rod is secured to the sheath using a threaded cap that also serves as a protective cover, merging two previously separate tools (knife and fire starter) into a single integrated assembly.
Solution Approach 2:
The knife sheath is designed with multi-functionality: it protects the knife blade, stores the ferrocerium fire starter rod, and provides a mounting interface (threaded provision) that allows the rod to be securely attached. The threaded cap serves dual purposes as both a securing mechanism and a protective cover for the rod.
2Reliability
If a permanent fire starter is integrated into the sheath, then fire-starting capability is always available, but the rod cannot be replaced when depleted
Solution Approach 1:
The fire starter rod is designed with dynamic characteristics, transitioning from a fixed permanent integration to a replaceable component. The threaded mounting provision and removable cap allow the rod to be easily detached and replaced when depleted, while maintaining secure attachment during use. This dynamic design enables both reliable availability and adaptability for replacement.
Solution Approach 2:
The fire starting system is segmented into separable components: the ferrocerium rod, the threaded mounting provision in the sheath, and the removable threaded cap. This segmentation allows the rod to be independently replaced while maintaining the integrity of the sheath and knife assembly, resolving the contradiction between permanent integration and replaceability.
3Ease of operation
If a threaded mounting system is used, then the rod can be easily mounted and removed, but the sheath requires additional threaded provisions that increase manufacturing complexity
Solution Approach 1:
The threaded mounting provision serves multiple functions: it provides a secure attachment mechanism for the ferrocerium rod, enables easy removal and replacement of the rod, and acts as a threaded cap to protect the rod when not in use. By making the mounting provision multi-functional, the additional manufacturing step is justified by the multiple benefits it provides.
Solution Approach 2:
The threaded cap serves as both the mounting mechanism and the protective cover, eliminating the need for separate components. The same threaded structure that secures the rod also protects it during storage and transport, reducing the number of parts and simplifying the overall assembly while maintaining ease of operation.
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
Provides a compact and versatile tool for starting fires in adverse conditions, combining the functionality of a knife and a fire starter, enhancing outdoor survival capabilities by integrating fire-starting capabilities directly into the knife assembly.
Implementation Method 1
When struck with a harder material, the ferrocerium mixture produces hot sparks that can reach temperatures exceeding 3,000 degrees Celsius. These hot sparks can easily ignite tinder and thus start a fire.
Implementation Method 2
When struck with a harder material, the ferrocerium mixture produces hot sparks
Data Source
AI summary
The disclosed technology includes a knife sheath with a removable rod. The knife sheath is configured to generate sparks to ignite fire when the rod is scraped with a knife. In some embodiments, the knife sheath includes a mounting provision configured to couple with a first end of the removable rod via corresponding threaded features. In some embodiments, the knife sheath is part of a knife assembly.