Lockable Tool Sliding Scale Release Mechanism

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Solution Overview

Problem

Existing lockable tools, such as knives with spring biased blades, have complex mechanisms that are not user-serviceable, require multiple fasteners, and can have micro-gaps leading to blade wiggle, making them inconvenient and prone to wear.

Innovation Solution

A lockable tool design featuring a sliding scale that moves along the longitudinal axis to activate a release mechanism, allowing for easy opening and closing, and can be configured for both right-hand and left-hand use with fewer parts and simplified assembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional Flylock mechanisms are used with multiple parts and fasteners, then the locking function is achieved, but the device complexity increases and user serviceability decreases

Engineering Contradiction:

Improvelocking functionVSAvoidnumber of parts

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The mechanism is divided into distinct functional modules: a blade assembly with sear, a handle assembly with scale, and a release mechanism. Each module can be independently serviced or replaced, reducing overall complexity while maintaining reliable locking function through modular design

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The scale serves multiple functions: it acts as a cover plate, a structural component of the handle, and the release activator. This multi-functionality reduces the number of separate parts needed while maintaining the locking reliability through integrated design

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of manufacture

If factory assembled permanent units are used, then the mechanism is pre-configured, but user serviceability and reconfigurability are lost

Engineering Contradiction:

Improvefactory assemblyVSAvoiduser serviceability

Core Design Contradiction:

Ease of manufactureVSEase of repair

Solution Approach 1:

The mechanism is designed with separable modules that can be easily disassembled and reassembled by users. The blade assembly, handle assembly, and release mechanism are configured to allow user maintenance and reconfiguration without requiring factory-level assembly precision

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The design transitions from a static permanent assembly to a dynamic reconfigurable system where components can be easily assembled, disassembled, and reconfigured by users, maintaining ease of manufacture while enabling user serviceability

Inventive Principle:

Principle #15Dynamics

3Ease of manufacture

If square cut sears with tolerance clearance are used, then the parts can be manufactured, but blade wiggle and micro-gaps increase

Engineering Contradiction:

Improvemanufacturing toleranceVSAvoidblade stability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The sear interface uses a specific geometric configuration with a sear face and corresponding sear hole arrangement that creates a positive interference fit. This local quality improvement at the critical interface reduces micro-gaps and blade wiggle while maintaining manufacturability through controlled tolerance in specific areas

Inventive Principle:

Principle #3Local quality

4Ease of operation

If visible buttons and levers are used for release, then the mechanism is activated, but the appearance becomes unsightly

Engineering Contradiction:

Improverelease activationVSAvoidappearance

Core Design Contradiction:

Ease of operationVSShape

Solution Approach 1:

The release mechanism is extracted from the traditional button/lever configuration and integrated into the scale structure. The scale itself becomes the release mechanism, eliminating the need for separate visible buttons or levers while maintaining ease of operation through the natural sliding motion of the scale

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The scale and release mechanism are merged into a single integrated component. The scale serves as both the structural cover and the release activator, eliminating the need for separate visible mechanical elements and achieving a sleek appearance while maintaining operational functionality

Inventive Principle:

Principle #5Merging (Combining)

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 user-serviceable tool with reduced parts and assembly complexity, minimizing blade wiggle and wear, while maintaining a sleek appearance without visible fasteners.

Implementation Method 1

A resilient member can bias the tool from a closed configuration to an open configuration

Methodology Applied

Scientific EffectSpring: Spring

Data Source

PatentUS20250144825A1Lockable tool with sliding scale release

Publication Date: 2025.05.08 LATAMA LLC

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 to 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.