Ergonomic Knife With J-Shaped Finger Guard
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Solution Overview
Problem
Conventional knives lack ergonomic design, leading to discomfort and risk of injury during use, especially when attempting to pare objects like fruit, due to inadequate finger placement and protection.
Innovation Solution
A knife design featuring a J-shaped section with a uniform thickness, a sharp edge thinner than the J-section, and a handle thicker than the J-section, allowing for comfortable finger placement and grip, with a curved intermediate section for enhanced control and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional knife design is used, then manufacturing is simple, but ergonomic comfort and safety are poor
Solution Approach 1:
The knife body is divided into three distinct sections: a blade section with sharp edge, a J-shaped section with substantially uniform thickness, and a handle section with greater thickness. This segmentation allows each section to serve its specific function while contributing to overall ergonomic comfort and safety.
Solution Approach 2:
Different sections of the knife have different thickness characteristics tailored to their functions: the J-shaped section has substantially uniform thickness for finger placement, the handle section has greater thickness for secure grip, and the blade section tapers to a sharp edge. This local variation in quality optimizes both comfort and performance.
2Productivity
If blade edge is made thinner for sharpness, then cutting efficiency improves, but risk of finger injury increases
Solution Approach 1:
The J-shaped section acts as an intermediary between the user's finger and the blade section. Its substantially uniform thickness provides a safe distance from the sharp edge, allowing the user to place their finger comfortably on the bottom portion while the index finger contacts the stem portion, thereby mediating the interaction and reducing injury risk.
Solution Approach 2:
The J-shaped section with its uniform thickness serves as a protective buffer before the user's finger can reach the sharp blade edge. This pre-positioned cushioning structure ensures that even if the user loses control, their finger will contact the thicker J-shaped section first, preventing direct contact with the thin sharp edge.
3Ease of operation
If handle thickness is increased for secure grip, then ease of operation improves, but overall knife weight increases
Solution Approach 1:
The handle section is designed with greater thickness specifically at the gripping area to provide secure hold, while other parts of the knife maintain thinner profiles. This localized increase in material only where needed for grip security minimizes overall weight addition while maximizing ergonomic benefit.
Data Source
AI summary
A knife including a blade section having a sharp edge, a J-shaped section, and a handle section connected to the J-shaped section. The J-shaped section may have a bottom portion connected to a stem portion, and a substantially uniform thickness. The sharp edge may have a thickness which is substantially less than the substantially uniform thickness of the J-shaped section. The handle section may have a thickness which is substantially greater than the uniform thickness of the J-shaped section. The blade section, the J-shaped section, and the handle section may be configured so that a person can place an index finger of the person so that an end of the index finger contacts the bottom portion of the J-shaped section and a length of the index finger contacts the stem portion of the J-shaped section, while simultaneously one or more further fingers of the person grip the handle section.