Convertible Cutting Device Abutment Retention Mechanism
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Solution Overview
Problem
Existing convertible cutting devices are complex, expensive, and cumbersome due to their deep security features and multiple operational elements, making them difficult to produce and use effectively as both scissors and knives.
Innovation Solution
A simplified convertible cutting device design featuring pivotable handles with integrated blades and a conversion mechanism that adapts between scissor and knife positions using abutment sections and a biasing element, allowing for single-handed operation and eliminating the need for additional locking mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deep security features and multiple operational elements are incorporated into convertible cutting devices, then reliability is improved, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The patent combines the security function and position retention function into a single abutment mechanism. The abutment section integrates both the retention of cutting elements in operational positions and the safety function, eliminating the need for separate locking mechanisms and reducing overall device complexity while maintaining reliability
Solution Approach 2:
The abutment section serves multiple functions simultaneously: it retains the first cutting element in the first position, retains the second cutting element in the second position, and provides safety assurance. This multi-functionality reduces the number of separate components needed, simplifying the device design
2Reliability
If deep security features and multiple operational elements are incorporated into convertible cutting devices, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
By merging the security mechanism and position retention mechanism into a single abutment structure, the patent reduces the number of parts that need to be manufactured and assembled. This integration simplifies the manufacturing process and reduces production costs while maintaining the required security and reliability
3Reliability
If multiple operational elements and locking mechanisms are added, then reliability is improved, but ease of operation deteriorates due to cumbersome handling
Solution Approach 1:
The patent extracts and eliminates unnecessary operational elements from the design. By removing separate locking mechanisms and simplifying the conversion process to rely on the abutment sections and spring biasing, the device becomes easier to operate while maintaining security through the retained abutment-based position locking
4Device complexity
If abutment sections are configured to abut against each other for retention, then device complexity is reduced, but reliability may be compromised
Solution Approach 1:
The spring element provides a biasing force that works in conjunction with the abutment sections to ensure reliable position retention. The spring counteracts any forces that might cause the cutting elements to move from their retained positions, enhancing the reliability of the abutment-based retention mechanism
Solution Approach 2:
The abutment sections are configured with specific geometric features including curved or angled surfaces that guide the cutting elements into and maintain them in the correct positions. This geometric design ensures positive engagement and reliable retention while keeping the mechanism simple
Data Source
AI summary
A convertible cutting device (1, 1′) comprises a first handle (2, 2′) with a first blade (8, 8′) and a second handle (5, 5′) with a second blade (11, 11′), and a conversion device (14, 14′) being configured to adapt at least a scissor position and a knife position. The conversion device (14, 14′) and the second handle (5, 5′) comprise in each case at least one abutment section (15, 15′; 18, 18′) being configured to abut against one another when the conversion device (14, 14′) is in the knife position and when the first handle (2, 2′) and the second handle (5, 5′) are in the closed position, whereby the conversion device (14, 14′) is retained in the knife position.