Out-the-Front Knife Dual-Action Spring-Assisted Blade Driver
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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 an actuator to manage blade movement between stowed and deployed positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a spring-biased mechanism is used to assist blade deployment, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The blade driver is segmented into multiple independent pushers (first blade pusher, second blade pusher, third blade pusher) that can be individually activated. This segmentation allows the complex spring-assisted mechanism to be broken down into manageable components, each handling a specific phase of blade movement, thereby improving ease of operation while making the overall complexity more controllable.
Solution Approach 2:
The springs are pre-loaded and positioned within the blade driver before blade deployment is initiated. The first blade pusher is spring-loaded to automatically engage and push the blade forward when activated, performing the work of overcoming static friction and initial resistance without requiring additional user effort during the deployment action.
2Productivity
If multiple blade pushers are used to assist blade movement, then productivity is improved, but device complexity increases
Solution Approach 1:
The blade driver incorporates multiple specialized pushers (first, second, and third blade pushers) that can be individually activated during different phases of blade movement. This segmentation enables parallel or sequential action of multiple pushers, increasing the speed and efficiency of blade deployment while maintaining organized structural complexity.
Solution Approach 2:
Multiple blade pushers are merged into a single integrated blade driver assembly that coordinates their actions. The pushers work together in a coordinated manner, with their combined force applied to the blade through the common structure of the blade driver, achieving high productivity while consolidating complexity into a unified mechanism.
3Reliability
If a retainer mechanism is used to lock the blade in position, then reliability is improved, but ease of operation worsens
Solution Approach 1:
The retainer mechanism is extracted as a separate, dedicated component within the blade driver, distinct from the pusher mechanisms. This separation allows the retainer to be independently activated only when needed for locking or release, maintaining reliable locking during normal operation while enabling easy release when the retainer is specifically engaged by the actuator.
Solution Approach 2:
The retainer mechanism operates periodically rather than continuously - it is engaged to lock the blade in the deployed position and disengaged to allow retraction, then re-engaged again after retraction. This periodic action provides reliable locking during the deployed state while requiring minimal user intervention only during the transition phases, balancing reliability with ease of operation.
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 includes at least one spring for springing the blade away from the stowed position toward the deployed position
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.