Safety Utility Blade Assembly With Tabbed Edge Shielding
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Solution Overview
Problem
Utility knives often cause injuries due to inadvertent contact with cutting edges, especially when handling or replacing blades, as standard razor blades lack adequate safety features to prevent exposure to sharp edges.
Innovation Solution
A safety utility knife assembly with a replaceable safety blade featuring a blade tab and securing aperture, along with a blade retainer and release mechanism, which limits user exposure to cutting edges and allows for easy blade replacement, combined with manufacturing methods that form the blade with a perpendicular cutting edge and securing holes for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a standard razor blade is used in a utility knife, then the cutting performance is improved, but the safety of the user deteriorates due to inadvertent contact with cutting edges
Solution Approach 1:
The blade is segmented into a cutting portion and a non-cutting tab portion. The tab portion extends beyond the cutting edge and provides a safe gripping area that is separated from the hazardous cutting edge, allowing users to handle and remove the blade without contact with sharp edges.
Solution Approach 2:
The blade tab serves as an intermediary element between the user's finger and the cutting edge. Instead of directly contacting the cutting edge, the user grasps the tab portion, which mediates the interaction and prevents direct exposure to the harmful cutting edge.
2Object-affected harmful factors
If a blade retainer mechanism is added to secure the blade, then the safety is improved by limiting blade movement, but the device complexity increases
Solution Approach 1:
The blade retainer uses a resilient (spring-loaded) arm that dynamically adjusts to secure the blade in place during use, then can be easily actuated to release the blade for removal. This dynamic mechanism provides secure retention without requiring complex locking systems.
3Ease of operation
If a blade tab is added to facilitate safe handling, then the ease of operation is improved, but the manufacturing complexity increases
Solution Approach 1:
The blade manufacturing process segments the blade into distinct functional zones: the cutting portion and the tab portion. This segmentation allows for specialized forming of each zone, with the tab being formed as an integrated extension that provides gripping functionality without requiring separate assembly steps.
Data Source
AI summary
The present disclosure relates to safety blades for use in utility knives, related assemblies and methods of manufacturing. More specifically, the present disclosure relates to safety blades for use in utility knives, related assemblies and methods of manufacture which limit user exposure to associated cutting edges.