Folding Knife Locking Arm Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing folding knives lack a reliable and user-friendly locking mechanism that ensures the blade remains securely locked in both open and closed positions, with a need for improved safety and ease of operation.
Innovation Solution
A folding knife with a spring-urged self-repositioning safety lock arm that engages the blade shank during opening and closing, requiring user initiation to unlock, featuring multiple engagement points for continuous locking and retention, utilizing a resilient spring and guide pins for precise blade control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple locking mechanism is used, then the device complexity is reduced, but the reliability of blade locking is insufficient
Solution Approach 1:
The locking mechanism is divided into multiple independent locking arms (first locking arm and second locking arm) that can operate independently. Each locking arm has its own engagement features and control mechanisms, allowing the system to achieve high reliability through redundancy while maintaining manageable complexity through modular design.
Solution Approach 2:
The locking arms are designed to be movable and repositionable rather than fixed. The first locking arm can pivot between engaged and disengaged positions, and the second locking arm can move along its engagement path. This dynamic design allows the mechanism to adapt to different blade positions and provide continuous locking reliability without requiring overly complex fixed structures.
2Reliability
If multiple locking arms are added to improve security, then the reliability improves, but the ease of operation deteriorates
Solution Approach 1:
The control member is pre-configured with multiple engagement features that correspond to the locking arms. When the control member is actuated, it simultaneously engages or disengages multiple locking arms through pre-established mechanical connections. This preliminary configuration allows multiple locking arms to be controlled by a single user action, maintaining ease of operation while improving reliability through multi-point locking.
Solution Approach 2:
Multiple locking arms and their control mechanisms are merged into a unified control system. The control member serves as a common interface that can engage or disengage multiple locking arms simultaneously. This merging reduces the number of separate user actions required while maintaining the security benefits of multiple locking points.
3Reliability
If the locking mechanism requires user initiation to unlock, then the safety improves, but the ease of operation worsens
Solution Approach 1:
The locking mechanism is designed to automatically engage and lock the blade without requiring continuous user intervention. The spring member provides automatic return motion to engage the locking arms, and the control member maintains engagement through its mechanical design. The system serves itself by using the blade's own movement and the spring's stored energy to maintain locking, reducing the need for frequent manual operations while ensuring safety.
4Adaptability or versatility
If continuous intermediate positioning is provided, then the adaptability improves, but the device complexity increases
Solution Approach 1:
The locking arms are designed with continuous movement capability rather than fixed positions. The first locking arm can pivot through a range of motion, and the second locking arm can move continuously along its engagement path. This dynamic design enables continuous intermediate positioning to accommodate different blade angles and positions while maintaining a relatively simple mechanical structure based on basic pivoting and sliding motions.
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
Provides a secure and intuitive locking mechanism that ensures the blade remains locked in open and closed positions, enhancing safety and usability by allowing controlled blade motion with multiple engagement points and spring-activated retention.
Implementation Method 1
A resilient spring and guide pins control the arm's movement and retention engagement with the blade shank
Data Source
AI summary
A folding knife having a blade pivoted from a closed position to an open locked position with a combined self-activating sliding release and locking arm. The sliding locking arm is mounted within the knife handle on dual fixed guide and pivot pins within respective arm openings being spring urged there against. Arm projections are engaged by the blade shank during operation moving the locking arm back and up then releasing to slide forward locking the blade in open use position until manual arm engagement by the user against the spring for release and transitional closure.