Multifunctional Cutting Knife with Retractable Blade and Integrated Marker
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Solution Overview
Problem
Users of cutting knives, particularly professionals like roofers, face challenges in reaching objects beyond their arm's length while maintaining a safe and healthy working position, and they often need to carry separate tools for cutting and marking.
Innovation Solution
A multifunctional cutting knife with a receptacle for a long handle and a marker stopper, allowing the blade to be retractable and the marker to be securely attached, enabling cutting and marking without the need for additional tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a standard cutting knife with a short handle is used, then the user can easily operate the knife, but the user cannot reach objects beyond their arm's length
Solution Approach 1:
The cutting knife incorporates a retractable blade mechanism that allows the blade to extend only when needed for cutting and retract into the handle for safe transport and storage. This dynamic design enables the handle to effectively extend its functional length while maintaining compactness and ease of operation when the blade is retracted.
Solution Approach 2:
The cutting knife is divided into distinct functional segments: the handle, the retractable blade, and the marker integration. This segmentation allows each component to be optimized independently - the handle provides leverage and control, while the blade provides cutting capability only when extended, resolving the contradiction between length and operability.
2Length of moving object
If a cutting knife with an extended handle is used, then the user can reach objects beyond their arm's length, but the user loses control and precision when cutting
Solution Approach 1:
The retractable blade mechanism allows the user to maintain a stable, controlled position for the knife handle while extending only the cutting edge when needed. This dynamic extension preserves control and precision by keeping the handle steady and the blade extended only during the actual cutting action, not during positioning or transport.
3Adaptability or versatility
If users carry both a cutting knife and a marker, then they can perform both cutting and marking functions, but they need to carry multiple tools
Solution Approach 1:
The cutting knife integrates a marker directly into the handle, combining two previously separate tools (cutting knife and marker) into a single unified device. This merging allows users to perform both cutting and marking functions with one tool, reducing the number of tools to carry while maintaining full functional capability.
Solution Approach 2:
The cutting knife is designed as a multifunctional tool that can both cut materials and mark surfaces. The integration of the marker into the handle creates a universal tool that adapts to different task requirements, eliminating the need for separate specialized tools and simplifying the user's toolkit.
Data Source
AI summary
An extended cutting knife includes a multifunctional cutting knife and a long handle operatively coupled to the multifunctional cutting knife. The multifunctional cutting knife includes a body, a cover forming a blade housing with the body, a blade disposed within the blade housing and a blade control for releasing the blade from and retracting the blade into the blade housing. The multifunctional cutting knife also includes a receptacle with a threaded outer portion for receiving the extended handle and a polygonal inner portion for receiving a marker. The marker is firmly attached to the body by a marker stopper received by an aperture communicating with the receptacle. The extended cutting knife with the extended handle attached allows a user to cut or mark objects in a standing position and beyond an arm's length. The blade control can include a screw, a knob or a slider.