Out-the-Front Knife Dual-Action Spring Blade Locking
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Solution Overview
Problem
Existing deployable blade knives lack efficient mechanisms for smoothly transitioning between stowed and deployed positions, often requiring manual manipulation and lacking spring-assisted dual-action deployment and retraction.
Innovation Solution
A dual-action spring-assisted mechanism in an out-the-front knife, featuring a blade driver with multiple pushers and retainers, allows the blade to be spring-assisted in both deployment and retraction, using actuators to manage blade movement between stowed and deployed positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a spring-assisted mechanism is added to assist blade deployment, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The blade driver is nested within the handle assembly, with the blade pusher contained within the blade driver. This nested configuration allows multiple functional components (spring, blade driver, blade pusher) to occupy minimal space while maintaining their individual functions, thus adding spring-assistance without proportionally increasing external complexity
Solution Approach 2:
The blade pusher acts as an intermediary component between the spring and the blade. It receives spring force and transfers it to the blade during deployment, while also providing a surface for user manipulation during manual retraction. This intermediary enables the spring-assisted function without requiring direct spring-blade connection that would oversimplify the system
2Productivity
If a dual-action mechanism is implemented for both deployment and retraction, then the productivity is improved, but the device complexity increases
Solution Approach 1:
The blade pusher serves multiple functions: it transmits spring force during deployment, provides a manual retraction interface, and engages with the retainer system. The blade driver similarly provides both deployment assistance and retraction guidance. This multi-functionality allows dual-action capability without requiring separate mechanisms for each direction
Solution Approach 2:
The deployment spring and retraction path are merged into a single blade driver assembly. The spring provides continuous force during deployment while the same assembly guides the blade during retraction. This merging of functions into a unified structure achieves dual-action productivity without the complexity of separate deployment and retraction mechanisms
3Ease of operation
If the blade is spring-biased to move to deployed position, then the ease of operation is improved, but the reliability decreases due to potential unintended deployment
Solution Approach 1:
The retainer system provides preliminary counter-action to the spring force that would otherwise cause unintended deployment. The retainer engages with the blade to prevent movement from the stowed position, effectively neutralizing the spring bias until deployment is intentionally initiated. This preliminary anti-action maintains reliability while preserving the spring-assisted deployment benefit
4Ease of operation
If multiple pushers are used in the blade driver, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The blade driver is segmented into multiple functional zones with different pushers: a first blade pusher for initial deployment assistance and a second blade pusher for continued blade movement. This segmentation allows each pusher to be optimized for its specific function, providing smooth overall blade movement while keeping each individual component relatively simple
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
Enables smooth, efficient, and safe deployment and retraction of the blade with minimal user effort, enhancing usability and safety by ensuring the blade is securely locked in both positions.
Implementation Method 1
The blade driver is configured to spring the blade toward the deployed position responsive to movement of the actuator in the deploying direction
Implementation Method 2
The blade driver is configured to spring the blade toward the stowed position responsive to movement of the actuator in the stowing direction
Data Source
AI summary
An out-the-front knife, components thereof, and associated methods. The out-the front knife can be a double-action spring-assisted knife. The knife includes a handle and a blade. The handle includes a rear end and a front opening opposite the rear end. The blade is movable with respect to the handle between stowed and deployed positions. In the stowed position, the blade is biased rearward. The knife includes an actuator movable in a deploying direction to spring the blade forward away from the stowed position toward the deployed position.