Safety Knife Blade Insert Segmentation for Rigid Mounting
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Solution Overview
Problem
Existing safety knives with replaceable blades face challenges in providing a rigid and cost-effective design that minimizes user injury risk during blade replacement and usage, often requiring complex connections and tools, and are less efficient due to non-rigid connections, leading to the prevalence of disposable knives.
Innovation Solution
A safety knife design featuring a blade with a guard and fixation that limits finger access to the cutting edge, using a holder and insert system with rails and grooves for secure blade placement, allowing easy and safe blade replacement and rigid connection, along with optional features like a spring mechanism and magnetic pins for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the guard is spaced at a small distance from the body of the knife to prevent finger access to the cutting edge, then user safety is improved, but the blade cannot be completely exposed which increases resistance during cutting
Solution Approach 1:
The blade is divided into a blade body and a separate cutting edge insert. The insert contains the cutting edge and is positioned in a slot in the blade body, allowing the guard to remain close to the body for safety while the insert provides full blade exposure for efficient cutting.
Solution Approach 2:
The cutting edge insert acts as an intermediary between the blade body and the cutting task. It allows the guard to be positioned close to the body for safety while the insert extends the cutting surface for efficient material removal.
2Strength
If strong connections are made between the guard-blade and blade-body to withstand cutting forces, then connection strength is improved, but the blade replacement becomes complicated requiring special tools or complex procedures
Solution Approach 1:
The cutting edge is separated into a removable insert that can be independently replaced. The insert is held by simple retaining features (protrusions fitting into recesses) that provide sufficient strength for cutting while allowing easy replacement without tools.
Solution Approach 2:
The cutting edge is extracted from the blade body as a separate insert. This allows the insert to be removed and replaced independently from the guard and blade body, simplifying the replacement procedure while maintaining connection strength through the slot and retaining features.
3Ease of manufacture
If disposable knives are used instead of knives with replaceable blades to avoid complex connections, then manufacturing cost is reduced, but long-term cost effectiveness decreases and environmental impact increases
Solution Approach 1:
The knife is segmented into a reusable body (guard, blade body, insert holder) and a disposable or replaceable insert. This allows the expensive components to be reused while only the cutting edge insert is replaced, providing long-term cost effectiveness comparable to or better than disposable knives.
Solution Approach 2:
The design allows the cutting edge insert to be discarded or replaced while recovering and reusing the blade body and guard components. This reduces waste and long-term costs compared to completely disposable knives, while maintaining simple manufacturing of the reusable components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enables safe and efficient cutting of various materials with reduced risk of user injury, allowing for easy blade replacement and improved rigidity, making it cost-effective and suitable for diverse cutting tasks without the need for special tools.
Implementation Method 1
The insert includes a spring between the blade piece and the holder, the spring being forced when the insert is inserted into the holder in the cutting direction
Implementation Method 2
optional features like a spring mechanism and magnetic pins for enhanced stability
Data Source
AI summary
Safety knife with a blade that can be replaced and where access to the cutting edge of the blade is limited so as to reduce the risk of injury to a user, comprising a blade piece with a blade arranged between a guard and a fixation and an oblong knife body comprising a holder and a partly flat insert for rigidly holding the blade piece near a proximal end, wherein said insert having rails on both sides of the flat part at least near the proximal end, said holder including a depression near the proximal end for receiving the fixation and a channel extending from the proximal end towards the distal end at least beyond the depression for receiving at least the flat part of the insert, said channel having grooves on each side starting at the proximal end for receiving the rails.