Utility Knife Blade With Functional Cutouts and Score Lines
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Solution Overview
Problem
Conventional utility knife blades, particularly trapezoidal blades, face challenges in efficient replacement and durability, as they often require rotation or snapping to expose new cutting surfaces, and may break under excessive force, limiting their utility and longevity.
Innovation Solution
The development of utility knife blades with a planar body shaped as an isosceles trapezoid featuring a sharpened edge, engagement features for retention, and functional cutouts that allow for bending without breaking, enabling extended use and easy replacement by incorporating multiple cutouts for specific functions like wire stripping, and a material composition that can withstand excessive force without fracturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional trapezoidal blades are used with rotation or snapping mechanisms to expose new cutting surfaces, then the blade can be reused, but the replacement process becomes complex and time-consuming
Solution Approach 1:
The blade is divided into multiple segments separated by score lines, allowing individual segments to be snapped off independently. This segmentation enables progressive replacement without requiring complex rotation mechanisms, simplifying the user interface while extending blade service life through incremental use.
Solution Approach 2:
The design extracts the replacement mechanism complexity by providing simple snap-off points at score lines. Users can easily remove used segments by applying force at these predetermined locations, eliminating the need for complex rotation or replacement mechanisms while maintaining blade reusability.
2Strength
If the blade is made stronger to withstand excessive force, then durability improves, but the blade becomes more prone to unintended separation or deformation
Solution Approach 1:
The blade exhibits different mechanical properties at different locations: the main body is strengthened for durability, while score lines are intentionally weakened to provide controlled snap-off points. This local quality variation allows the blade to resist unintended separation while enabling planned segment removal at specific locations.
Solution Approach 2:
Score lines are pre-formed in the blade to provide controlled failure points. These pre-weakened lines act as cushioning zones that guide separation at predetermined locations rather than allowing random fracture, ensuring reliable segment removal while maintaining overall blade strength.
3Adaptability or versatility
If functional cutouts are added to the blade for wire stripping and other tasks, then versatility improves, but the blade structure becomes more complex
Solution Approach 1:
Multiple functions are merged into a single blade component by integrating functional cutouts directly into the blade body. These cutouts provide wire stripping capability and other specialized functions without requiring separate tools, thereby increasing versatility while maintaining a unified, relatively simple blade structure.
Solution Approach 2:
The blade is designed with multi-functionality by incorporating functional cutouts that enable wire stripping and other tasks beyond basic cutting. This universal design allows a single blade to perform multiple functions, reducing the need for separate specialized tools while maintaining manageable structural complexity.
Data Source
AI summary
A utility knife blade may include a planar body generally shaped as an isosceles trapezoid with a long base, a short base, a first leg, and a second leg, the long and short base being generally parallel; a sharpened edge formed on the long base; an engagement feature configured to retain the utility knife blade in a utility knife; and a first functional cutout extending into the first leg, spaced from both the engagement feature and the sharpened edge. A utility knife blade may also include a planar body defining an unsharpened edge and a sharpened edge; an engagement feature configured to retain the utility knife blade in a utility knife; and a first functional cutout extending into the planar body. The planar body is configured to bend without breaking upon application of a force transverse to the planar body that exceeds an intended force for the first functional cutout.