Utility Knife Cutter Structure to Prevent Tape Adhesive Transfer
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Solution Overview
Problem
Utility knives with retractable blades often transfer adhesive from cutting materials like tape onto the blade, which is undesirable.
Innovation Solution
A utility knife design featuring a housing with a slot and a cutter structure extending from the front surface, allowing the blade to be movable between exposed and enclosed positions, and incorporating a blade retainer and slider mechanism to manage blade exposure, along with a base that can pivot to store blades and a cutter structure for cutting tape without transferring adhesive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a retractable blade is used to cut adhesive materials like tape, then cutting capability is improved, but adhesive transfers onto the blade which is undesirable
Solution Approach 1:
The cutting function is segmented into two separate components: the retractable blade for general cutting and the fixed cutter structure for adhesive materials. This segmentation allows each component to be optimized for its specific function, with the cutter structure being specifically designed to prevent adhesive transfer while the blade handles other cutting tasks.
Solution Approach 2:
The cutter structure acts as an intermediary between the blade and adhesive materials. Instead of the blade directly contacting adhesive materials, the cutter structure is positioned to intercept and cut the adhesive materials first, preventing direct contact between the blade and adhesive, thus eliminating the adhesive transfer problem.
2Object-generated harmful factors
If a cutter structure is added to prevent adhesive transfer, then adhesive transfer is reduced, but device complexity increases
Solution Approach 1:
The cutter structure is merged with the existing housing structure of the utility knife. The cutter is integrated into the housing in such a way that it becomes a unified structure, eliminating the need for separate complex mechanisms while still providing the function of preventing adhesive transfer.
Solution Approach 2:
The housing structure serves multiple functions: it provides structural support, guides the retractable blade, and incorporates the cutter structure for cutting adhesive materials. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
3Ease of operation
If the blade is always exposed for easy access, then ease of operation is improved, but safety is reduced due to exposure to the sharp blade
Solution Approach 1:
The blade is designed to be dynamically movable between an exposed position for easy access and an enclosed position for safety. The retractable mechanism allows the blade to move along the longitudinal axis of the housing, enabling the user to expose the blade only when needed and retract it when not in use, thus balancing ease of operation with safety.
Solution Approach 2:
The retractable blade mechanism is designed to be easily operated by the user through simple manual action. The blade can be retracted and extended without requiring additional tools or complex operations, allowing the user to control blade exposure based on immediate needs, thus achieving both ease of operation and safety.
Data Source
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AI summary
A utility knife includes a housing extending along a longitudinal axis and defining a slot at a front surface of the housing and a blade coupled to the housing at least partially within the slot and movable relative to the housing between an exposed position and an enclosed position. The housing includes a cutter structure extending from the front surface of the housing along the longitudinal axis adjacent to the slot. The cutter structure defines a cutting edge. In the exposed position, the blade at least partially extends from the housing adjacent to the cutter structure.