Utility Blade Asymmetric Retention for Holder Stability
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Solution Overview
Problem
Conventional utility blades with double-end cutter designs face limitations in cutting edge geometry due to interaction with utility knife blade holders, leading to dulled edges and unstable mounting, which affects longevity and secure engagement.
Innovation Solution
The implementation of utility blades with angularly offset blade retention features on the tang, allowing for versatile geometries and improved stability, combined with a blade holder that includes multiple engagement components to securely hold both non-reversible and reversible blades, reducing free movement and facilitating easier mounting and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional double-end utility blades are designed with symmetric cutting edges to engage with utility knife blade holders, then the blades can be mounted in either orientation, but the cutting edges are dulled by interaction with the blade holder and the blade positioning becomes unstable
Solution Approach 1:
The patent applies asymmetry by designing the utility blade with non-symmetric cutting edges where each end has a different geometry. One end has a first cutting edge geometry while the other end has a second cutting edge geometry that is different from the first. This asymmetric design allows each cutting edge to be optimized for specific cutting tasks while engaging with corresponding asymmetric engagement features on the blade holder, preventing the blade from rotating or becoming loose during use.
2Adaptability or versatility
If conventional utility blades use symmetric mounting features to allow either end to be mounted, then versatility is improved, but the cutting edges experience harmful interaction with the blade holder causing dulling
Solution Approach 1:
The patent eliminates blade reversibility by designing asymmetric mounting features where the first end has a first engagement feature and the second end has a second engagement feature that is different from the first. This asymmetric configuration ensures the blade can only be mounted in one correct orientation, preventing the cutting edges from contacting the blade holder in ways that would cause dulling, while still allowing the blade to be securely mounted.
3Ease of operation
If conventional utility blades allow free movement during sharpening to access cutting edges, then sharpening is easier, but the blade positioning within the holder becomes loose and unstable
Solution Approach 1:
The patent segments the blade holder into multiple components including a holder body and a movable clamp assembly. The clamp assembly can be independently actuated to release the blade, allowing the cutting edges to be accessed for sharpening while the blade remains securely positioned in the holder. This segmentation enables easy maintenance access without compromising the stable engagement of the blade during normal use.
4Device complexity
If conventional blade holders use simple engagement features, then device complexity is reduced, but the blade engagement becomes loose and free movement occurs
Solution Approach 1:
The patent implements a dynamic blade holder with a movable clamp assembly that can transition between engaged and disengaged states. The clamp assembly includes movable elements that apply frictional engagement forces to secure the blade firmly in place during use, then can be actuated to release the blade for easy removal. This dynamic mechanism provides reliable blade engagement without requiring overly complex fixed structures.
Data Source
AI summary
A utility blade includes a first blade retention feature positioned on a proximal edge of a tang of the utility blade. The proximal edge is angularly offset from a longitudinal axis of the utility blade. The first blade retention feature is associated with an engagement axis parallel to the longitudinal axis of the utility blade. The utility blade is configured to translate along the engagement axis to cause the first blade retention feature to engage with a first blade engagement component of a blade holder. The utility blade further includes a second blade retention feature positioned on a second edge of the tang of the utility blade. The second blade retention feature is positioned along the longitudinal axis of the utility blade and between the first blade retention feature and a distal tip of a cutting portion of the utility blade.