Recessed Blade Cutting Tool with Trigger Mechanism
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Solution Overview
Problem
Existing cutting tools for thin materials, such as scissors, utility knives, and concealed blade cutters, face challenges with safety and efficiency, particularly when cutting stretchy materials like shrink or stretch-wrap, which can bunch and require high force, and may cause injuries due to exposed blades or difficulty in initiating cuts at intermediate positions.
Innovation Solution
A cutting hand tool with a blade in a recessed area that uses a trigger mechanism to facilitate a scissor-like cutting motion, allowing easy cutting of folded or stretchy materials without strong force, and featuring a spring mechanism to return the blade to its original position, ensuring safety by preventing accidental contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a concealed blade cutter with a recess is used to prevent accidental contact, then safety is improved, but the opening can become completely blocked if the material bunches together
Solution Approach 1:
The blade is made movable relative to the recess through a trigger mechanism, allowing the blade to dynamically adjust its position. When the trigger is activated, the blade moves forward to cut the material even when it is bunched or folded, while returning to the recessed safe position when the trigger is released. This dynamic movement resolves the contradiction by maintaining safety during normal operation while enabling cutting initiation when material bunching occurs.
2Reliability
If the blade is placed in a recess to prevent injuries, then safety is improved, but high force is required to cut folded or stretchy materials
Solution Approach 1:
The trigger mechanism enables dynamic blade movement that allows the blade to penetrate folded or stretchy materials with reduced force. The mechanical advantage provided by the trigger lever system amplifies the user's input force, enabling the blade to cut through difficult materials while maintaining the safety benefit of the recessed position during normal handling.
3Ease of operation
If scissors are used to cut thin materials, then cutting capability is improved, but exposed blades can be hazardous and require special guards
Solution Approach 1:
The blade is extracted from full exposure and placed in a recessed position during normal operation, separating the blade's cutting function from its exposed state. The trigger mechanism allows temporary exposure only when needed for cutting, while the blade remains concealed and safe during handling, storage, and non-cutting operations. This resolves the contradiction by providing cutting capability when needed while eliminating continuous blade exposure hazard.
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
Enables safe and efficient cutting of thin materials, including stretchy ones, by reducing the initial cutting force required and preventing injuries from blade exposure, while allowing cuts to be initiated at any position without damaging underlying items.
Implementation Method 1
a spring mechanism to return the blade to its original position
Data Source
Figure 1
Figure 2
AI summary
A cutting hand tool which allows easy cutting of thin materials. The cutting blade (21) is placed in a recess (16) to prevent accidents and can be rotated or laterally moved by activating a trigger (30) so that an additional force can be applied to cut the material whenever this is required to continue the cutting motion, when the material is rolled over, folded, bunched or reinforced and therefore requires an additional cutting force.