Cutting Tool Removable Blade Segmented Handle

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Solution Overview

Problem

Existing cutting tools for natural or synthetic slates require complex and hazardous blade replacement procedures, posing a risk of losing parts during use, especially when used by professionals on-site.

Innovation Solution

A cutting tool design featuring a blade with an oblong notch and through-hole arrangement allows for easy blade change by sliding the blade relative to the axis of rotation without disassembling the handle from the hollow body, using spacers and fixing lugs with through holes for secure attachment and guidance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the blade is fixed using two fixing pins passing through the handle and spacers, then the blade is securely attached to the tool, but the blade replacement process becomes complex and hazardous requiring complete disassembly of the handle

Engineering Contradiction:

Improvesecure blade attachmentVSAvoidblade replacement simplicity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The fixing end of the handle is segmented into two fixing lugs spaced apart by a distance equal to the blade thickness, allowing the blade to be independently removed without disassembling the entire handle from the hollow body. This segmentation enables partial disassembly for blade replacement while maintaining secure attachment during use.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The blade is extracted from the handle by removing only the fixing pin from the fixing lugs, allowing the blade to be separated from the handle while the handle remains attached to the hollow body. This extraction principle enables safe blade replacement without risking loss of other components.

Inventive Principle:

Principle #2Taking out (Extraction)

2Ease of operation

If the handle is completely disassembled to replace the blade, then the blade can be removed, but there is a high risk of losing parts during the replacement process

Engineering Contradiction:

Improveblade accessibilityVSAvoidpart retention safety

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The handle is segmented into a gripping part and a fixing end with fixing lugs, allowing the blade to be accessed and removed from the fixing lugs without completely disassembling the handle from the hollow body. This segmentation enables blade replacement while keeping the handle assembly intact, preventing loss of parts.

Inventive Principle:

Principle #1Segmentation

3Device complexity

If the fixing end has the same width as the grip portion, then the structure is simple, but the blade cannot be properly guided and supported during cutting

Engineering Contradiction:

Improvehandle structure simplicityVSAvoidblade guidance accuracy

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The fixing end of the handle has a width less than the grip portion, creating a localized reduction in width that accommodates the blade between two fixing lugs. This local quality change provides proper guidance and support for the blade during cutting while maintaining overall structural simplicity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Two spacers are introduced as intermediary elements between the fixing lugs and the hollow body, providing proper spacing and support for the blade. These spacers enable accurate blade positioning and guidance without complicating the overall handle structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Reliability

If the fixing pin passes through the entire handle assembly, then the blade is securely fixed, but the blade replacement requires removing the rotary handle from the tool

Engineering Contradiction:

Improveblade fixation strengthVSAvoidreplacement procedure steps

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The fixing mechanism is segmented into fixing lugs at the fixing end of the handle, allowing the fixing pin to secure the blade locally without requiring the entire handle assembly to be disassembled. This segmentation simplifies the replacement procedure while maintaining fixation strength.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The blade can be extracted from the handle by removing only the fixing pin from the fixing lugs, without needing to remove the rotary handle from the hollow body. This extraction approach reduces the number of steps in the replacement procedure while maintaining secure fixation during use.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentEP3093111B1Cutting tool with removable blade and blade for such a tool

Publication Date: 2019.11.06 ESTAB PIERRE GREHAL & CO SA

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AI summary

The invention provides a simple plate cutting tool (A) that allows for easy blade changes. The tool (200) comprises a hollow body (201), a first gripping handle (204) fixed relative to the hollow body, a second gripping handle (205) pivotally mounted on the hollow body about an axis of rotation (207), and a blade (209). According to the invention, the attachment end (206) of the pivoting handle has a width (L2) less than the width (L1) of the rest of the pivoting handle and includes two attachment tabs (206a) connected to the rest of the pivoting handle by a camber (206b), spaced apart by a distance (e) equal to the thickness (e) of the blade (209), and each tab comprising a through hole (206c), opposite each other, for the passage of a mounting pin (210).The blade (209) is inserted between the fixing tabs (206a), and two spacers (208) are arranged on either side of the fixing end (206), one between each fixing tab (206a) and the hollow body (201).