Retractable Knife Assisted Opening Coil Spring Mechanism
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Solution Overview
Problem
Conventional knives lack efficient assisted opening mechanisms that are easy to use and provide secure blade extension and retraction, often requiring complex manual dexterity and multiple steps.
Innovation Solution
A retractable blade knife design featuring a top and bottom handle scale coupled via fasteners, a large coil spring for assisted opening, and a retracting key system allowing three methods of assisted opening, including a pinch grip, hip push, and reverse grip, with a milled aluminum handle and stainless steel components for durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional manual opening mechanism is used, then the knife requires complex manual dexterity and multiple steps, but this increases the difficulty of operation and reduces ease of use
Solution Approach 1:
A coil spring is pre-loaded and positioned within the handle to automatically propel the blade forward when the locking mechanism is disengaged. This preliminary action eliminates the need for complex manual opening steps, as the spring has already stored the necessary energy to perform the opening action.
Solution Approach 2:
The opening function is extracted from the manual operation and transferred to an independent spring mechanism. The spring is housed within the handle and engages with the blade tang, separating the opening function from user hand movements and reducing operational complexity.
2Ease of operation
If the blade is made retractable with spring assistance, then single-action opening is achieved, but the mechanism requires secure locking in both open and closed positions
Solution Approach 1:
The blade positioning system transitions from static to dynamic control. A reversible locking mechanism allows the blade to be securely held in either the retracted or extended position, with the ability to switch between states. This dynamic system ensures reliability in both positions while maintaining ease of operation.
Solution Approach 2:
A tang engagement system acts as an intermediary between the blade and handle. The blade tang extends into the handle and engages with locking surfaces, providing secure mechanical interlocking in both open and closed positions while allowing smooth transitions between states.
3Adaptability or versatility
If a retracting key system is added for assisted opening, then multiple opening methods are provided, but the device complexity increases
Solution Approach 1:
The blade tang serves multiple functions: it acts as the cutting edge extension, the spring engagement point, and the retracting key mechanism. This multi-functionality provides versatile opening methods (pinch grip, hip push, reverse grip) without adding separate complex mechanisms for each method.
Solution Approach 2:
The retracting key system is merged with the existing blade tang and spring mechanism. The tang itself becomes the retracting key that interacts with the spring and locking surfaces, combining multiple functions into a single integrated component rather than adding separate mechanisms.
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 easy and secure blade extension and retraction with a single-action assisted opening, providing a user-friendly experience while ensuring the knife is securely locked in both open and closed positions, enhancing usability and safety.
Implementation Method 1
a large coil spring adapted to cause the blade to thrust out from a first partially extended position to a second partially extended position
Data Source
AI summary
Certain exemplary embodiments can provide a retractable blade knife, which can comprise a handle and a blade. The handle can comprise a top handle scale operatively coupled to a bottom handle scale via a plurality of fasteners. The retractable blade knife can comprise a large coil spring adapted to cause the blade to thrust out from a first partially extended position to a second partially extended position.