Folding Knife Blade Cover for Safety and Length
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Solution Overview
Problem
Folding karambit knives typically have short blades relative to the handle length, preventing the blade from extending into the finger hole without exposing the user to the sharpened edge, limiting the blade's length.
Innovation Solution
A movable blade cover or guard that projects into the finger hole in the closed position and automatically retracts when the blade is opened, allowing a longer blade configuration while maintaining user safety by covering the cutting edge when the finger is inserted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the blade length is increased to be more commensurate with the handle length, then the blade's functionality and cutting capability are improved, but the sharpened edge exposes the user to injury risk when the finger is inserted into the finger hole
Solution Approach 1:
The blade cover is positioned in advance to cover the sharpened edge of the blade when it extends into the finger hole. This preliminary protective action ensures that before the user's finger can contact the blade edge, the cover is already in place blocking the harmful factor, thus allowing longer blade configuration without increasing injury risk.
Solution Approach 2:
The blade cover acts as an intermediary element between the sharpened blade edge and the user's finger. This mediator component physically separates the harmful cutting edge from potential contact with the finger, enabling the blade to extend into the finger hole area while maintaining user safety through the intermediate protective barrier.
2Object-affected harmful factors
If a blade cover is added to cover the cutting edge when the blade is retracted, then user safety is improved, but the device complexity increases
Solution Approach 1:
The blade cover is designed as a dynamic component that automatically moves between covering and retracted positions based on blade movement. Rather than a fixed complex mechanism, the cover dynamically adapts its position - covering the blade edge when retracted and moving away when extended - reducing overall structural complexity while maintaining safety functionality.
Solution Approach 2:
The blade cover system is designed to be self-actuating through spring mechanisms that automatically position the cover without requiring additional user input or complex control systems. The spring-loaded design allows the cover to self-adjust its position based on blade movement, simplifying the overall device structure while ensuring consistent protective functionality.
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
Enables a blade length more commensurate with the handle length, enhancing user safety and functionality by automatically shielding the cutting edge during finger insertion and retracting when the blade is extended.
Implementation Method 1
a spring is configured to contact and automatically move the blade cover from the operable position towards the withdrawn position
Data Source
AI summary
A folding knife having an elongated handle defining a finger hole proximate one end of the handle and a blade having a cutting edge and pivotally connected to the handle and configured to move with respect to the handle between a retracted position and an extended position. The blade is configured such that a portion of the cutting edge extends into the finger hole upon the blade being in the retracted position. A blade cover is connected to the handle and is configured to move between an operable position and a withdrawn position. A spring is configured to contact and automatically move the blade cover from the operable position towards the withdrawn position, whereby, as the blade reaches the retracted position, the blade cover is automatically moved to the operable position and covers the portion of the cutting edge of the blade extending into the finger hole, and upon the blade moving towards the extended position, the spring automatically moves the blade cover from the operable position towards the withdrawn position.