Segmented Safety Utility Blade with Blunt Grip Edge
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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 the cutting edges.
Innovation Solution
A safety utility knife assembly with a handle and blade retainer that includes a blade release mechanism and catch, featuring a replaceable safety blade with a blade tab and securing aperture, which limits user exposure to the cutting edge by allowing secure engagement and easy removal of the blade.
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 risk increases due to inadvertent contact with cutting edges
Solution Approach 1:
The blade is segmented into two separate edges: a sharp cutting edge for cutting performance and a blunt safe edge for handling and insertion. This segmentation allows the blade to provide both excellent cutting ability and safety during blade replacement and handling operations.
Solution Approach 2:
The blunt safe edge acts as an intermediary element between the user's fingers and the sharp cutting edge. Users can grip and manipulate the blade by the safe edge, which prevents direct contact with the hazardous cutting edge while maintaining full control over the blade.
2Duration of action of moving object
If a double edge razor blade is used, then the blade can be used on both sides extending its service life, but the risk of inadvertent contact with cutting edges increases during handling
Solution Approach 1:
Each side of the blade is segmented into a sharp cutting edge for cutting and a blunt safe edge for handling. This allows users to safely handle and insert the blade when flipping it to use the opposite edge, maintaining both longevity and safety.
Solution Approach 2:
The blade is pre-configured with blunt safe edges on both sides before use. This preliminary design feature ensures that whenever the blade needs to be handled or replaced, there is always a safe edge available for gripping, eliminating the need for special handling procedures.
3Device complexity
If a single edge razor blade without gripping tab is used, then the blade structure is simplified, but inadvertent contact with cutting edges occurs during insertion and removal
Solution Approach 1:
The blade structure is segmented to include a blunt safe edge that serves as an inherent gripping surface. This eliminates the need for separate gripping tabs or complex retention mechanisms while preventing inadvertent contact during insertion and removal operations.
Solution Approach 2:
The blunt safe edge serves multiple functions: it provides a gripping surface for handling, acts as a guide for proper blade insertion orientation, and prevents finger contact with the sharp cutting edge. This multi-functional element simplifies the overall blade design.
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.