Folding Knife Self-Locking Linkage Assembly
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Solution Overview
Problem
Folding knives with linkage bar assemblies and locking mechanisms often require complex mechanisms to transition between storage and use positions, lacking a simple and reliable self-locking mechanism to securely retain the blade in the open position.
Innovation Solution
A folding knife design featuring a self-locking linkage assembly with interlocking linking elements and a protrusion system that allows the blade to pivot and lock into place using a biasing element, ensuring the blade remains open without manual effort, and can be easily unlocked for storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a linkage bar assembly is used to move the blade between storage and use positions, then the blade can be easily opened for use, but the mechanism lacks a simple and reliable self-locking mechanism to securely retain the blade in the open position
Solution Approach 1:
The linkage bar assembly is designed to automatically lock the blade in the open position through its own structural features without requiring additional locking components or user intervention. The interlocking features of the linkage bars create a self-sustaining locked state that maintains blade retention reliably
Solution Approach 2:
The linkage mechanism is divided into multiple bars with distinct interlocking features, where each bar segment contributes to the overall locking function. This segmentation allows the mechanism to achieve both ease of operation and reliable retention through coordinated movement of discrete components
2Reliability
If a complex locking mechanism is added to securely retain the blade in the open position, then blade retention reliability is improved, but the device complexity increases
Solution Approach 1:
The locking function is merged into the existing linkage bar assembly structure itself, rather than being implemented as a separate locking mechanism. The interlocking features are integrated into the bars that already exist for blade movement, eliminating the need for additional locking components
Solution Approach 2:
The linkage bars serve multiple functions: they enable blade movement between positions and simultaneously provide self-locking capability. This multi-functionality eliminates the need for separate locking mechanisms, reducing overall device complexity while maintaining reliable blade retention
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 a secure, self-locking mechanism that maintains the blade in the open position with reduced user effort, enhancing safety and usability by preventing accidental closure while allowing easy transition between positions.
Implementation Method 1
a biasing element configured to bias the first linking element into the locked orientation
Implementation Method 2
the protrusion can be rotated within the first portion of the opening and the blade can be moved from the storage position to the use position
Data Source
AI summary
A folding knife can include a handle comprising a side wall having a side surface, a protrusion extending laterally from the side surface of the side wall, a blade, and a linkage assembly pivotably coupling the handle to the blade. The protrusion can have an edge extending laterally from the side surface of the side wall to the side surface of the protrusion. The edge can include a first surface portion and a second surface portion configured as a locking surface. The second surface portion can extend downwardly at an angle relative to the first surface portion. The blade can have a tang including a locking edge, and can be translatable relative to the handle between a storage position and a use position. When the blade is in the use position, the locking surface engages the locking edge to resist movement of the blade in a first direction.