Convertible Utility Knife Blade Rotation Mechanism
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Solution Overview
Problem
Existing utility knives with rotatable blades are either large due to complex locking mechanisms or require complicated screw and spring systems, and often rely on specialized carriages for blade support, making them less compact and user-friendly.
Innovation Solution
A convertible utility knife design featuring an elongated housing with a slide mechanism and stud system that allows the blade to rotate freely and be secured in various positions without screws or cams, using the handle to support the blade in the scraper position, and a button to control the blade's extension and retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a cam system is used to lock the blade into various positions, then the blade can be secured in multiple positions, but the tool becomes large and the locking mechanism becomes complicated
Solution Approach 1:
The patent removes the cam system entirely from the blade mounting mechanism. Instead of using a cam to lock the blade, the invention uses a simple recessed area in the handle that directly receives and holds the blade, eliminating the complex locking mechanism while maintaining the ability to secure the blade in position.
Solution Approach 2:
The handle is segmented into a recessed area specifically designed to receive and hold the blade. This segmentation allows the blade to be securely positioned without requiring a complex integrated locking system, as the recessed portion provides natural mechanical retention.
2Adaptability or versatility
If a special carriage system is used to support and adapt the utility blade, then the blade can be supported and the tool can accept the utility blade, but the apparatus requires disassembly to replace the blade
Solution Approach 1:
The patent eliminates the special carriage system entirely. The blade is mounted directly into a recessed area of the handle, removing the intermediate carriage component. This allows the blade to be easily inserted and removed without disassembling any carriage mechanisms.
Solution Approach 2:
The blade mounting function is merged directly into the handle structure through the recessed area. The handle itself provides both support and adaptation functions that were previously separated into a distinct carriage system, simplifying the overall structure and improving ease of blade replacement.
3Ease of operation
If a spring mechanism is used for single-action operation of retracting/extending and rotating functions, then both functions can be operated with one action, but the spring system becomes complicated
Solution Approach 1:
The patent removes the spring mechanism entirely from the design. The retracting/extending and rotating functions are achieved through simple geometric relationships between the blade, recessed area, and handle structure, eliminating the need for complex spring systems.
Solution Approach 2:
The blade is designed to freely rotate and move between positions without mechanical constraints from springs or locks. The dynamic movement is guided by the recessed area geometry, allowing the blade to naturally transition between cutting and scraping positions without complicated actuation mechanisms.
4Adaptability or versatility
If a specialized carriage mechanism is used to support the blade in scraper position, then the blade can be supported in scraping position, but the mechanism becomes complicated and tool size increases
Solution Approach 1:
The patent eliminates the specialized carriage mechanism for scraper position support. The recessed area in the handle is designed to accommodate the blade in both cutting and scraping positions, providing support directly through the handle structure rather than through a separate carriage system.
Solution Approach 2:
The recessed area in the handle serves multiple functions: it supports the blade in cutting position, supports the blade in scraping position, and allows free rotation between positions. This universal support structure replaces multiple specialized mechanisms, reducing complexity while maintaining versatility.
Data Source
AI summary
Embodiments are described for a simple convertible utility knife and scraper includes a handle, slide mechanism, and flat spring with a centrally mounted utility blade. The flat spring locks into precut positions in the handle to secure the blade in the desired position, whether in a cutting position or a scraping position. The blade can be partially extended to expose the front of the blade in the cutting position. When the slide is fully extended, the blade can rotate about a central axis to a position perpendicular to the handle and then be retracted into slots at the end of the handle to secure and support the blade in the scraper position.