Folding Knife Spring-Biased Locking Mechanism
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Solution Overview
Problem
Existing folding knives face issues with locking mechanisms that are either difficult to use, prone to dirt accumulation, or limited in functionality, particularly in safely locking the blade in both open and closed positions.
Innovation Solution
A sliding locking mechanism with a spring-biased design, where a locking mechanism is mounted in the handle scale and attached to pivot posts, using grooves on the pivot posts to lock the blade in place, with a spring force ensuring secure engagement in both open and closed positions, and a tab providing structural support to prevent over-rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a helical spring is positioned to the side of the blade within the handle, then it can provide biasing force for opening and closing the blade, but it is prone to collect dirt that is inaccessible to the user and difficult to clean out
Solution Approach 1:
The spring is extracted from the internal handle cavity and repositioned to engage the locking bar in a more accessible location. The spring's anchor point is moved to the locking bar itself rather than being embedded deep within the handle, allowing users to access and clean around the spring more easily while maintaining its biasing function for both blade open and closed positions.
2Reliability
If a locking mechanism is designed to lock the blade in open and closed positions, then safety is improved, but the mechanism becomes more complex and difficult to use
Solution Approach 1:
The locking mechanism merges the locking bar and spring assembly into a unified component that automatically provides locking in both open and closed positions. The locking bar engages with the blade's tang and the spring provides continuous biasing force, creating a simple two-position lock system that requires minimal user intervention while ensuring secure locking in either state.
Solution Approach 2:
The locking mechanism is designed to be self-actuating through the spring's biasing force. When the blade is opened or closed, the spring automatically pushes the locking bar into engagement with the blade tang, providing automatic locking without requiring separate manual locking actions from the user.
3Reliability
If a leaf spring is used to bias the blade, then it can prevent the blade from opening when closed, but it cannot be configured to bias a closed blade into an open condition
Solution Approach 1:
The spring mechanism is designed with dynamic engagement characteristics that allow it to adapt its biasing function based on blade position. The spring engages the locking bar in a manner that provides bidirectional biasing - preventing unintended opening when closed and assisting the transition to the open position, thereby achieving versatile position control through a single dynamic mechanism.
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 safe and easy-to-use locking mechanism that securely locks the blade in both positions, overcoming the limitations of existing technologies by ensuring reliable operation and ease of cleaning.
Implementation Method 1
A spring is mounted in the first handle scale and is in contact with the locking mechanism to provide a spring force to bias the locking mechanism into contact with the first pivot post
Data Source
AI summary
A folding knife has a blade pivotably mounted between a first handle scale and a second handle scale and attached to a first pivot post and a second pivot post. A locking mechanism is slidably mounted in the first handle scale and is spring biased into contact with the first pivot post. The locking mechanism is spring biased into contact with a first groove on the first pivot post when the blade is in a closed position thereby preventing the blade from pivoting to the open position, and the locking mechanism is spring biased into contact with a second groove on the first pivot post when the blade is in an open position thereby preventing the blade from pivoting to the closed position.