Retractable Knife Conveyance for Full-Grip Blade Deployment

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Solution Overview

Problem

Existing emergency defensive folding knives, particularly karambits, require the user to relinquish their grip on the handle to deploy the blade from its storage position to its use position, compromising control and safety in critical situations.

Innovation Solution

A novel blade conveyance system that allows the blade to be manually conveyed from its storage to use position while maintaining a firm grip on the handle, using front and rear conveyance arms with pivot holes, a blade guard, and an actuation surface for intuitive deployment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If traditional rotational blade deployment is used, then the blade can be moved from storage to use position, but the user must release their grip on the handle

Engineering Contradiction:

Improveblade deploymentVSAvoidgrip maintenance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The blade conveyance system is segmented into multiple components: front conveyance arm, rear conveyance arm, pivot holes, blade guard, and actuation surface. This segmentation allows the blade to be conveyed through a controlled path that does not require releasing the handle grip, as each component works independently to facilitate blade movement while maintaining user control.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The conveyance arms act as intermediaries between the blade and the handle. These arms provide a mechanical pathway that transfers the blade from the storage position to the use position without requiring direct manipulation of the handle, thus allowing the user to maintain their grip while still achieving blade deployment.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If the blade is conveyed through a fixed rotational path, then the mechanism is simple, but the user cannot maintain full grasp during deployment

Engineering Contradiction:

Improveconveyance mechanismVSAvoidmaintaining grip

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The conveyance mechanism incorporates dynamic elements through pivot holes that allow the conveyance arms to move relative to each other and the handle. This dynamic capability enables the blade to be conveyed along an adaptable path that accommodates the user's grip position, eliminating the need to release the handle while still achieving reliable blade deployment.

Inventive Principle:

Principle #15Dynamics

3Speed

If rapid blade deployment is implemented, then emergency response time is reduced, but control over the blade movement may be compromised

Engineering Contradiction:

Improveblade deployment speedVSAvoidblade control

Core Design Contradiction:

SpeedVSEase of operation

Solution Approach 1:

The blade guard and positioned pivot holes provide inherent feedback mechanisms that control the blade's movement path. The blade guard prevents excessive deviation from the intended conveyance path, while the pivot holes guide the conveyance arms through precise movements. This feedback system ensures rapid deployment while maintaining full control over the blade's position and orientation.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12466090B2Retractable knife for rapid manual deployment while fully grasped

Publication Date: 2025.11.11 GB II CORP COLUMBIA RIVER KNIFE & TOOL CO

AI summary

A self-defense pocket knife with handle of suitable proportion to be grasped in closed first and a conveyance system configured for the emergency manual conveyance of a blade from a position for storage to a position for use without requiring the user to appreciably alter or compromise grip upon the handle during the course of such conveyance.