Replaceable Knife Blade Interlocking Base and Fastener
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Solution Overview
Problem
Conventional knives wear out over time and require sharpening, which reduces the blade size and alters its shape, making them less effective and eventually requiring replacement, especially in multi-functional tools where the blade is a valuable component.
Innovation Solution
A knife design featuring a replaceable blade that securely attaches to a knife base using an interlocking profile and axial fastener system, allowing for easy blade replacement while maintaining a stable fixation, enabling the use of different blade profiles and extending the tool's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional knives are sharpened to restore cutting ability, then the cutting edge is restored, but the blade size is reduced and shape is altered
Solution Approach 1:
The knife is divided into two separate components: a reusable handle (knife base) and a replaceable blade. This segmentation allows the blade to be replaced when worn, while the handle retains value and functionality. The interlocking profile with protrusions and recesses enables secure attachment while allowing complete blade replacement without affecting the handle.
2Duration of action of stationary object
If conventional knives are sharpened repeatedly, then cutting ability is maintained, but the blade eventually becomes too small or misshapen requiring replacement
Solution Approach 1:
The blade is designed as a disposable component that is discarded when worn and replaced with a new one. The handle is recovered and reused multiple times. This approach eliminates the cumulative shape degradation problem of repeated sharpening, as each new blade starts with the original precise geometry from manufacturing.
3Adaptability or versatility
If a knife blade is made replaceable, then blade replacement is enabled when dull, but the device complexity increases
Solution Approach 1:
The fastening system merges multiple functions into a single integrated mechanism. The interlocking profile combines mechanical engagement (protrusions fitting into recesses) with alignment features, creating a unified attachment system that secures the blade while maintaining simplicity. The fastener integrates both attachment and alignment functions in one component.
4Stability of the object's composition
If an interlocking profile system is used to secure the blade, then blade fixation stability is improved, but the device complexity increases
Solution Approach 1:
The interlocking profile uses asymmetric protrusions and complementary recesses that provide stable fixation through geometric interlocking. The asymmetric design prevents unintended disengagement while maintaining a simple structure. The fastener head and slot configuration creates a unidirectional locking mechanism that is simple yet effective at preventing blade movement.
Data Source
AI summary
A knife is provided having an interchangeable and replaceable blade. A knife may include: a knife base defining a base protrusion and a base recess; a replaceable knife blade defining a blade protrusion and a blade recess; and a fastener, wherein the knife base is held fixed relative to the replaceable knife blade in a plane along which the replaceable knife blade extends in response to the base protrusion engaging the blade recess and the blade protrusion engaging the base recess; and where the knife is held fixed relative to the replaceable knife blade in an axis orthogonal to the plane of the replaceable knife blade by the fastener securing the knife base to the replaceable knife blade.