Relief Guard for Hand Tool Cutting Aperture
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Solution Overview
Problem
Existing hand tools, such as shears and cutters, face challenges in accurately and repeatedly positioning objects between cutting edges, particularly during high-volume operations, due to over-insertion into stress relief apertures.
Innovation Solution
The design incorporates a relief guard coupled to the cutting portions of the hand tool, which covers the relief aperture to prevent object insertion and includes pivotally coupled cutting edges with adjustable relief guards of varying lengths, angles, and widths to enhance accuracy and repeatability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a relief aperture is provided adjacent to cutting edges for stress relief, then structural integrity and stress management are improved, but positioning accuracy and repeatability deteriorate due to over-insertion of objects
Solution Approach 1:
The relief aperture is segmented into two functional zones: an open area for stress relief and a restricted area covered by the relief guard. This segmentation allows the aperture to simultaneously provide stress management functionality while preventing over-insertion of objects, thus resolving the contradiction between structural integrity and positioning accuracy
Solution Approach 2:
A relief guard is introduced as an intermediary component that selectively covers portions of the relief aperture. The guard acts as a mediator between the stress relief function and the positioning precision requirement, allowing stress to be relieved in uncovered areas while preventing object over-insertion in covered areas
2Device complexity
If traditional cutting tool design is used without relief guard, then device simplicity is maintained, but positioning repeatability and accuracy worsen in high-volume operations
Solution Approach 1:
The relief guard is designed with adjustable and removable features, allowing the system to adapt between different operational modes. The guard can be positioned, removed, or adjusted based on specific cutting requirements, providing dynamic control over the balance between simplicity and repeatability in high-volume operations
3Stress or pressure
If relief aperture is fully open for stress relief, then stress management effectiveness is improved, but object positioning control deteriorates due to over-insertion
Solution Approach 1:
Different portions of the relief aperture are treated with different qualities: some areas remain open to provide stress relief functionality, while other areas are covered by the relief guard to provide positioning control. This local differentiation resolves the contradiction between stress management effectiveness and positioning control
Data Source
AI summary
A cutter comprising a first cutting portion having a first cutting edge, a second cutting portion having a second cutting edge and pivotally coupled to the first cutting portion, a relief aperture defined by the first and second cutting portions adjacent the first and second cutting edges, and a relief guard coupled to the first and second cutting portions to at least partially cover the relief aperture such that an object to be received between the first and second cutting portions is restricted from entering the relief aperture.