Lockable Knife Sliding Scale Release Mechanism
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Solution Overview
Problem
Conventional lockable tools, such as knives with Flylock mechanisms, are complex, difficult to service, and often have tolerance issues leading to blade wiggle due to multiple parts and factory assembly, making them inconvenient for users and aesthetically undesirable.
Innovation Solution
A lockable tool design featuring a sliding scale along the longitudinal axis for easy activation, with a simplified mechanism that can be configured for left- or right-hand use, requiring fewer parts and allowing user serviceability, using a frame with opposing side walls and a resilient cam system for automatic or manual opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Flylock mechanisms with multiple parts are used, then the locking function is achieved, but the device complexity increases and manufacturing precision deteriorates due to tolerance accumulation
Solution Approach 1:
The patent merges multiple separate components (scale, sear, spring, blade) into an integrated assembly where the scale acts as both a cover and a release mechanism. The sear is directly attached to the scale, eliminating the need for separate fasteners and reducing part count while maintaining the locking function.
Solution Approach 2:
The scale serves multiple functions: it covers the internal mechanism, provides a sliding release interface, and acts as a lever to activate the sear. This multi-functionality reduces the need for additional components and simplifies the overall device structure.
2Reliability
If conventional Flylock mechanisms with multiple fasteners are used, then the locking function is achieved, but ease of repair deteriorates due to factory assembly
Solution Approach 1:
The mechanism is divided into modular components (scale assembly, sear, spring, blade) that can be independently accessed and serviced. The scale can be removed to access internal components, allowing users to service or replace parts without disassembling the entire device.
Solution Approach 2:
The design allows end-users to service, clean, and reassemble the mechanism without specialized tools or factory equipment. The simple construction with minimal fasteners enables users to perform maintenance themselves, extending the tool's lifespan.
3Reliability
If square cut sears with tolerance clearance are used, then the locking function is achieved, but stability deteriorates due to micro-gaps and blade wiggle
Solution Approach 1:
The patent converts the inherent play and movement in the mechanism into a beneficial feature by using a spring-loaded sear that maintains constant pressure against the blade. This ensures stable locking while allowing for manufacturing tolerances and wear over time.
Solution Approach 2:
The sear geometry is changed from a rigid square cut to a spring-loaded design that can adapt to variations in blade thickness and wear. The spring force compensates for tolerance accumulation, maintaining stable contact and eliminating blade wiggle.
4Ease of operation
If visible buttons and levers are used for release, then ease of operation is improved, but appearance deteriorates due to unsightly mechanisms
Solution Approach 1:
The release mechanism is merged with the scale cover, making the activation interface flush with the exterior. The scale itself becomes the button, eliminating the need for separate visible release components while maintaining ease of operation.
Solution Approach 2:
The scale is designed to look like a finished aesthetic element rather than a functional component. Its sliding mechanism is concealed, and the exterior surface can be decorated or textured to match the overall design, hiding the release function behind an attractive facade.
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 design provides a sleek appearance without visible fasteners, reduces part count, and enhances user serviceability, ensuring a more stable blade with less play in open or closed positions, improving usability and aesthetics.
Implementation Method 1
A resilient member, such as a coil kick spring, can be joined to the cam and biased to rotate the cam
Implementation Method 2
A sear can be provided to engage the cam and lock the tool in the open or closed position
Implementation Method 3
The scale can be slidably mounted on the frame and coupled to the release mechanism so that the release can be activated by reciprocating the scale along the longitudinal axis
Data Source
AI summary
A lockable tool with a sliding scale release is formed with a frame and a tool coupled to the frame with a locking mechanism to lock the tool into an extended or retracted configuration. A release mechanism is attached a scale on the side of the frame. The scale is coupled to the frame. The tool is constructed such that sliding the scale along a longitudinal axis of the frame automatically unlocks the tool from the extended or retracted configurations. The tool can open and/or close automatically. The tool, such as a knife, can swing open or extend out a front opening in the frame.