Utility Cutter Blade Slide Mechanism
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Solution Overview
Problem
Utility cutters pose a hazard due to accidental actuation during storage or non-use, as they can be activated unintentionally, risking injury to users or bystanders, and existing designs do not adequately protect the user from the blade when not in use.
Innovation Solution
A utility cutter design featuring a handle with a blade slide mechanism that automatically retracts into a safe position when not in use, utilizing a biasing member to return the blade to a protected state without user intervention, and a guide with a contoured surface to engage workpieces, allowing for automatic extension and retraction of the blade for cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the blade is exposed for cutting operations, then cutting efficiency is improved, but the risk of accidental injury increases
Solution Approach 1:
The blade is designed to be movable between an extended cutting position and a retracted safe position. The blade slide mechanism allows the blade to dynamically change its position based on operational needs, extending only when material is present to be cut and automatically retracting when not in use, thus resolving the contradiction between cutting efficiency and safety.
Solution Approach 2:
The biasing member automatically returns the blade to the retracted position when the material is removed or the cutting operation is complete, without requiring user intervention. This self-service mechanism ensures the blade is consistently in the safe position during storage or non-use, eliminating accidental injury risks while maintaining cutting efficiency during operation.
2Object-affected harmful factors
If the blade is automatically retracted using a biasing member, then safety is improved, but device complexity increases
Solution Approach 1:
The safety mechanism is segmented into distinct functional components: the blade slide that moves the blade, and the biasing member that provides automatic retraction. This segmentation allows each component to perform its specific function efficiently, achieving safety through a relatively simple and maintainable structure rather than a complex integrated system.
3Ease of operation
If the guide engages the workpiece to extend the blade, then user effort is reduced, but the risk of accidental activation increases
Solution Approach 1:
The guide is designed with a contoured surface that must actively engage the workpiece to overcome the biasing force and extend the blade. This preliminary anti-action mechanism prevents accidental activation because the blade will not extend unless the workpiece is deliberately placed in the guide, requiring intentional user action while still reducing effort during proper operation.
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 design reduces the risk of accidental injuries by ensuring the blade is enclosed during non-use and minimizes user effort required for cutting, while allowing for efficient cutting of various materials with a variable depth of cut based on material thickness.
Implementation Method 1
a biasing member configured to urge the guide toward the face surface of the handle by biasing the blade shuttle toward the retracted position
Implementation Method 2
the guide including a contoured surface configured to engage a workpiece to extend the blade slide a distance from the retracted position to an extended position
Data Source
AI summary
A knife includes a handle that includes a gripping surface; one or more blades positioned in one or more recesses of the handle that extend from an opening of the handle; a guide coupled to the blade near a distal end of the blade opposite the proximal end, the guide including a contoured surface configured to engage a workpiece wherein a portion of the guide is pointed and configured to puncture the workpiece and another portion of the guide is configured to smoothly abut an underside of the workpiece once the guide has been inserted into the workpiece, and the handle further includes cut-away regions just ahead of the leading edge of cutting edges of the one or more blades, the cut-away portions configured to provide relief for bunching sections of a workpiece being cut by the knife.