Folding Knife Lock Bar Segmentation for Fatigue Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing integral lock bar designs in locking folding knives face challenges in achieving optimal reliability and longevity due to geometric constraints and aesthetics, particularly in handles that fit the natural curve of the hand, where a longer lock bar is needed to reduce fatigue but complicates the alignment of the deflection axis and locking surface.
Innovation Solution
A locking folding knife design featuring a handle with a pocket and a through-cut that terminates at an endpoint, where an integral extension of the handle forms a lock that engages with the blade, allowing for optimal placement of the deflection axis and enhanced stiffness, while maintaining desirable aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lock bar length is increased to reduce fatigue and improve reliability, then the reliability and service life are improved, but the geometric alignment between the deflection axis and locking surface becomes more complex and difficult to achieve
Solution Approach 1:
The lock bar is segmented into multiple sections with different functional zones: a first section with a first deflection axis for engagement, and a second section with a second deflection axis for locking surface alignment. This segmentation allows each section to be optimized independently, resolving the geometric alignment complexity while maintaining the benefits of a longer lock bar for reduced fatigue.
Solution Approach 2:
The invention introduces a multi-dimensional approach by incorporating deflection axes at different orientations and positions along the lock bar. Instead of a single-plane alignment, the lock bar operates in multiple dimensions with deflection axes arranged to accommodate the geometric constraints of the handle while maintaining optimal locking geometry.
2Duration of action of stationary object
If the lock bar length is increased to reduce fatigue, then the service life is improved, but the aesthetic appearance of the handle is compromised
Solution Approach 1:
The lock bar features local quality variations with different sections having distinct properties. The first section is optimized for engagement with the blade, while the second section is configured to align with the locking surface. This allows the lock bar to be longer for fatigue reduction while maintaining aesthetic handle geometry by concentrating functional features in specific local zones.
3Strength
If the deflection axis placement is optimized for a longer lock bar, then the fatigue resistance is improved, but the handle geometry for natural hand curve fitting becomes more complex
Solution Approach 1:
The lock bar is divided into segments with separate deflection axes, allowing the first deflection axis to be positioned for optimal fatigue resistance in the engagement section, while the second deflection axis accommodates the handle's natural curve geometry in the locking section. This segmentation decouples the conflicting geometric requirements.
Solution Approach 2:
The lock bar incorporates dynamic deflection capabilities at multiple axes, allowing it to adapt its deformation pattern during operation. The first deflection axis handles engagement dynamics, while the second deflection axis accommodates the dynamic geometry of the handle fitting the natural hand curve, reducing overall handle geometry complexity.
Data Source
AI summary
A locking folding knife includes a handle and a blade pivotally connected to the handle. The blade has a cutting edge and a first position in which at least a portion of the cutting edge is located within the handle and a second position in which a majority of the cutting edge is outside of the handle. A pocket is defined in a first surface of the handle. A through-cut is in the pocket, wherein the through-cut terminates in the pocket at an endpoint. A lock is integral with the handle and extends from the endpoint of the through-cut, wherein the lock engages with a portion of the blade in the second position.