Folding Knife Figure-8 Toggle Lock for Closure Security
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Solution Overview
Problem
Existing folding knives lack a secure mechanism that requires additional motion to ensure the blade remains in a closed position, potentially leading to accidental openings.
Innovation Solution
A knife lock mechanism incorporating a toggle system with a secondary lock zone and a biasing force that requires additional motion to transition between open and closed positions, utilizing a toggle with a figure-8 configuration and a secondary lock face to prevent unintended blade rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple lock mechanism is used, then the device complexity is reduced, but the reliability of blade closure is compromised leading to potential accidental openings
Solution Approach 1:
The lock mechanism is divided into two distinct locking zones: a primary lock zone with a first lock face and a secondary lock zone with a second lock face. This segmentation provides redundant locking points, ensuring that the blade must pass through both zones to close, thereby significantly improving closure security without requiring a completely complex new mechanism.
Solution Approach 2:
The secondary lock zone is positioned such that the blade must first engage the primary lock face, then continue moving to engage the secondary lock face. This preliminary action sequence ensures that the blade is locked at an intermediate position before final closure, preventing accidental openings while maintaining a relatively simple overall structure.
2Reliability
If a toggle mechanism with figure-8 configuration is used, then the blade closure security is improved, but the ease of operation deteriorates due to additional motion required
Solution Approach 1:
The toggle mechanism employs a figure-8 configuration that dynamically transitions between two stable positions corresponding to the primary and secondary lock zones. This dynamic design allows the blade to be securely locked during the transition, improving closure security, while the figure-8 geometry is optimized to minimize the additional motion required, balancing 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
The mechanism provides enhanced safety by ensuring the blade remains securely closed until intentional user action is taken, preventing accidental openings.
Implementation Method 1
A knife lock mechanism incorporating a toggle system with a secondary lock zone and a biasing force
Data Source
AI summary
A folding knife has a frame and a blade pivotable relative to the frame about a fold axis between an open position and a closed position. A toggle coupled to the frame and pivotable relative to the frame about a toggle axis is configured for selectively locking the blade in the open position. A cantilever spring has a free end configured to selectively retain the toggle in a selected position.