Cutting Tool Limiter Prevents Blade Distance Yielding
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Solution Overview
Problem
Existing cutting tools with pivotable handles and blades suffer from yielding under increased cutting force, causing the blades to lose optimal cutting efficiency due to changes in the distance between them.
Innovation Solution
Incorporating a limiter in the overlapping region of the second blade and handle to prevent axial movement and a side preventer to limit sideways movement, ensuring that the applied force is transmitted effectively through the pivots without altering the blade distance, thus maintaining optimal cutting force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cutting force is increased to improve cutting performance, then the cutting efficiency is improved, but the material of the cutting tool yields and bends causing changes in blade distance
Solution Approach 1:
The limiter is positioned in advance within the overlapping region to prevent the back end from moving away from the second handle in the axial direction before yielding occurs. This preliminary constraint counteracts the harmful effect of material yielding under high cutting forces, maintaining stable blade distance while allowing high cutting force application for improved cutting efficiency
2Strength
If the handles and blades are made more robust to resist yielding, then the strength is improved, but the device complexity increases
Solution Approach 1:
The limiter acts as an intermediary element between the second handle and back end, providing a simple mechanical constraint that prevents axial movement without requiring complex reinforcement of the entire handle-blade structure. This mediator approach increases strength at the critical interface with minimal added complexity
Data Source
AI summary
The invention relates to a cutting tool (1) comprising: a first handle (2) and a first blade (3) fixedly attached to each other, a second handle (4) and a second blade (5) pivotably attached to each other by a first pivot (6) and a second pivot (7). In order to obtain a cutting tool with an optimal cutting force, the cutting tool comprises a limiter (11) allowing the back end (9′) to move sideways (S) in relation to the second handle (4) and preventing the back end (9) at least from moving away from the second handle (4) in an axial direction (A) of the first pivot (6).