Knife Sharpener Blade Replacement Mechanism

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Solution Overview

Problem

Conventional knife sharpeners have fixed sharpening blades that are difficult to replace, leading to waste of material and reduced lifespan, as only one side of each blade is utilized for sharpening.

Innovation Solution

A knife sharpening device with a blade replacement arrangement that allows for the detachment and repositioning of sharpening blades, enabling both sides of each blade to be used, thus extending the device's and blades' lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If sharpening blades are securely affixed in the housing, then the structural stability is improved, but the ease of replacement deteriorates

Engineering Contradiction:

Improvestructural stabilityVSAvoidease of replacement

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The housing is divided into a fixed portion and a movable portion that can slide relative to each other. The sharpening blade is held by the movable portion, which can be independently displaced to expose different edges of the blade. This segmentation allows the blade to remain securely held during use while enabling easy replacement and repositioning when needed.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The supporting device for the sharpening blade is designed to be movable rather than fixed. The movable supporting device can slide along the housing to expose different edges of the blade sequentially. This dynamic design allows the blade to maintain stable contact during sharpening while enabling easy repositioning and replacement by simply moving the supporting device to a replacement position.

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If only one side of the sharpening blade is utilized, then the sharpening precision is maintained, but the loss of substance increases

Engineering Contradiction:

Improvesharpening precisionVSAvoidmaterial waste

Core Design Contradiction:

Manufacturing precisionVSLoss of substance

Solution Approach 1:

The sharpening blade is designed with multiple usable edges (at least two edges). The movable supporting device enables sequential exposure of different edges during the sharpening process. This multi-functionality allows the same blade to perform sharpening operations multiple times on different edges, significantly reducing material waste while maintaining sharpening precision through proper positioning and angle control.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The device enables continuous useful action by allowing sequential use of multiple edges of the same sharpening blade. Instead of discarding the blade after one edge is used, the movable supporting device allows the user to reposition and use subsequent edges, extending the useful life of the blade and maintaining continuous sharpening capability without material waste.

Inventive Principle:

Principle #20Continuity of useful action

3Reliability

If the entire knife sharpener is replaced, then the reliability is restored, but the loss of time and cost increase

Engineering Contradiction:

Improvedevice reliabilityVSAvoidreplacement time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The sharpening blade is extracted as a separate, independently replaceable component from the housing. The movable supporting device holding the blade can be independently displaced to a replacement position where the blade can be removed and replaced without affecting the housing or other components. This extraction principle allows rapid blade replacement, restoring reliability when needed while minimizing time loss compared to replacing the entire sharpener.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The device enables self-service blade replacement through its movable supporting device design. Users can independently displace the movable supporting device to access and replace blades without requiring professional service or complex disassembly procedures. This self-service capability restores reliability quickly while minimizing time investment from users.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS11478891B2Knife sharpening device

Publication Date: 2022.10.25 FENG JIANFENG

AI summary

A knife sharpening device includes a main housing, a first knife sharpening blade having two first sharpening edges, a second knife sharpening blade having two second longitudinal sharpening edges, and a blade replacement arrangement. The blade replacement arrangement includes a first supporting device movably and inclinedly supported by the main housing, a first knife sharpening blade detachably supported on the first supporting device to expose one of the first sharpening edges out of the first supporting device, a second supporting device movably and inclinedly supported by the main housing to and a second knife sharpening blade being detachably supported on the second supporting device to expose one of the second longitudinal sharpening edges out of the second supporting device.