Folding Knife Blade Guard and Locking Mechanism
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Solution Overview
Problem
Existing knives, particularly folding and utility knives, pose safety hazards due to inadvertent blade closure, require two-handed operation, and lack operational resistance, which can lead to injuries, especially when unattended.
Innovation Solution
A knife design featuring a blade guard covered by a resilient member, with a guard actuator allowing single-handed operation and increased operational resistance to prevent inadvertent blade closure, including a locking mechanism that automatically transitions between guarded and unguarded positions, enhancing safety and usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a spring loaded arm is used to maintain the blade in the open position, then the blade remains in the cutting position, but the blade can accelerate into the closed position causing inadvertent cuts
Solution Approach 1:
The patent applies preliminary anti-action by designing a controlled closing mechanism that counteracts the spring force before it can cause harmful acceleration. The blade closing process is regulated through a cam mechanism that gradually releases the blade, preventing sudden movements that could injure the user while still allowing the spring to maintain the blade in the open position during cutting operations.
2Object-affected harmful factors
If the blade is kept in the closed position inside the handle, then safety is improved, but the transition to open position requires two-handed operation
Solution Approach 1:
The patent segments the blade operation into distinct phases: a protected transition phase during opening/closing and a free cutting phase during use. The blade is divided functionally between the cutting edge portion and the handle integration portion. This segmentation allows the blade to be safely contained during transitions while enabling easy single-handed operation during cutting, as the user only needs to actuate the release mechanism rather than manually control the entire blade movement.
3Object-affected harmful factors
If a locking mechanism is added to prevent inadvertent closing, then safety is improved, but the device complexity increases
Solution Approach 1:
The patent merges the locking function with the existing spring-loaded arm mechanism. The cam mechanism serves dual purposes: it controls the blade closing speed to prevent injury and simultaneously locks the blade in the open position during cutting operations. This integration eliminates the need for separate locking components, maintaining safety while minimizing additional complexity in the overall device structure.
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
The design provides enhanced safety by preventing inadvertent blade closure and allowing single-handed operation, while maintaining resistance to unintended use, thereby reducing the risk of injury and improving user safety.
Implementation Method 1
The guard is maintained in a normally blade covered position by a resilient member
Data Source
AI summary
A folding knife for applying a cutting action includes a blade assembly having a guard configured to cover the cutting edge of the blade when the knife is not in use. The guard is maintained in a normally blade covered position by a resilient member. The blade guard has a guard actuator for providing at least one motion for a user to move the blade guard from the normally blade covered position to an un-guarded or cutting position. The knife further includes an actuator for unlocking the blade assembly from the closed position to a locked open position. Upon depression of the actuator, the blade assembly will automatically open to a locked open position from a locked closed position.