Two-Piece Backlock Toggle Mechanism for Folding Knife Blade Security
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Solution Overview
Problem
Existing folding knives lack a simple, cost-effective, and reliable locking mechanism that securely maintains the blade in an extended position while preventing inadvertent closure, often requiring complex designs or prone to failure.
Innovation Solution
A two-piece backlock mechanism with a toggle and biasing member that engages the blade tang, providing compression force to secure the blade in an extended position and impede closure, allowing easy manipulation by the user's thumb and minimizing components for manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is added to secure the blade in extended position, then safety and reliability are improved, but device complexity increases
Solution Approach 1:
The locking mechanism is divided into two separate pieces: a backlock component and a toggle component. The backlock includes a body with a slot and a spring, while the toggle includes arms that engage with the blade tang. This segmentation allows each component to perform its specific function independently, simplifying manufacturing and assembly while ensuring reliable blade security through coordinated operation of the divided components.
2Ease of manufacture
If a simple locking mechanism is used, then manufacturing cost is reduced, but reliability and strength decrease
Solution Approach 1:
The backlock spring is pre-loaded and positioned within the backlock body before final assembly. The spring engages with the toggle arms in advance, creating a ready-to-lock configuration. This preliminary action ensures that when the blade is inserted, the locking mechanism immediately engages with sufficient force to secure the blade reliably, while the pre-assembled spring mechanism reduces manufacturing complexity and cost.
3Device complexity
If a two-piece backlock is used instead of single-piece or other locking mechanisms, then manufacturing cost and complexity are reduced, but compression force and strength may be compromised
Solution Approach 1:
The backlock and toggle components are designed to work together as an integrated locking system. The backlock body with its slot and the toggle arms are precisely shaped to mate with each other, distributing the compression force across multiple contact points. This merging of two simple components creates a locking mechanism that achieves the necessary compression force and strength equivalent to more complex single-piece designs, while maintaining ease of manufacture and assembly.
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 solution provides a secure, strong, and easy-to-use locking mechanism that maintains the blade in an extended position with improved compressive strength, reducing the risk of inadvertent closure and simplifying assembly, while being inexpensive to manufacture and reliable in operation.
Implementation Method 1
a biasing member (e.g., a spring) that urges the toggle to engage the tang
Implementation Method 2
The toggle is engaged against the tang and provides a compression force that prevents the blade from closing
Data Source
AI summary
A locking mechanism for a folding knife is provided. More specifically, the locking mechanism is a two-piece backlock that maintains the folding knife's extended position and prevents the blade from inadvertently closing when the knife is in use in the extended position and impedes the folding knife from inadvertently opening when the knife is in a closed position of storage. The locking mechanism generally comprises a backlock, a toggle, and a biasing member. The toggle rotates between two positions and engages with the tang of the blade and the backlock.