Knife Sharpening Carriage With Spring Force And Secure Clamping

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Solution Overview

Problem

Existing knife sharpeners require users to apply the proper amount of force and angle manually, leading to inconsistent sharpening, potential damage to the blade, and increased risk of injury, while powered sharpeners are complex and bulky.

Innovation Solution

A knife sharpener system with a support structure and a carriage assembly that moves along a guide track, applying a constant force to the blade using a spring-biased sharpening element, and includes a clamping assembly to secure the knife, ensuring consistent and safe sharpening.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If manual knife sharpeners require users to apply proper force and angle, then sharpening can be performed, but sharpening consistency deteriorates and user injury risk increases

Engineering Contradiction:

Improveease of sharpening operationVSAvoidsharpening consistency

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The system enables self-service sharpening where the device automatically applies the correct force and angle through its mechanical structure. The carriage assembly with spring-biased sharpening element performs the sharpening action without requiring the user to manually control force application, allowing even inexperienced users to achieve consistent sharpening results.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces the user's manual mechanical control system with an automated mechanical carriage assembly. The carriage assembly, guided by a guide track, automatically positions and applies the sharpening element to the blade at the correct angle and force, substituting human manual operation with a controlled mechanical system.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Manufacturing precision

If powered knife sharpeners are used to automate sharpening, then sharpening consistency improves, but device complexity and size increase

Engineering Contradiction:

Improvesharpening consistencyVSAvoidsystem complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The spring-biased sharpening element provides automatic force application through elastic potential energy storage and release. The spring mechanism self-regulates the force applied during sharpening strokes, eliminating the need for complex electronic controls, motors, or sensors while maintaining consistent sharpening pressure throughout the stroke.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system uses simple, replaceable mechanical components rather than complex, expensive electronic systems. The spring mechanism and carriage assembly are straightforward mechanical parts that can be easily replaced if needed, avoiding the complexity and cost of powered systems with motors and electronics.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Ease of operation

If manual sharpening is performed without proper guidance, then users can sharpen blades, but user injury risk increases due to exposure to cutting edges

Engineering Contradiction:

Improveease of sharpening operationVSAvoiduser injury risk

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The carriage assembly serves as an intermediary mechanism between the user and the blade. Instead of the user directly contacting the sharpening element and blade, the carriage assembly mediates this interaction by providing a controlled mechanical interface that guides the sharpening action while maintaining safety through enclosed guidance structures.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces direct manual contact with a mechanical carriage system that intermediates between the user's hand and the blade. The carriage assembly, moving along a guide track, provides a safe mechanical interface that eliminates the need for users to directly expose themselves to the cutting edge while still allowing effective sharpening.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 system provides controlled and reproducible sharpening strokes, protecting users from the blade and allowing easy, consistent sharpening without complex electronics, suitable for various knife sizes and profiles.

Implementation Method 1

a spring-biased sharpening element configured to apply a substantially constant force to a cutting edge of a blade

Methodology Applied

Scientific EffectSpring: Spring

Data Source

PatentUS20250222561A1Knife sharpening systems

Publication Date: 2025.07.10 SHARKNINJA OPERATING LLC

AI summary

Knife sharpener systems and methods are provided. In one exemplary embodiment, a knife sharpening system can include a support structure configured to hold a knife having a handle and a blade extending therefrom, and a carriage assembly mounted on the support structure. The carriage assembly can have a sharpening element that is configured to sharpen a cutting edge of the blade. The carriage assembly can be movable relative to the knife blade to cause the sharpening element to apply a force to the cutting edge of the knife blade.