Replaceable Blade Knife Carrier Locking Mechanism
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Solution Overview
Problem
Existing knives with replaceable blade mechanisms are difficult to use safely and efficiently, as they require complicated interconnection sequences and separate parts that can be lost, making it challenging to replace blades without risking injury or rendering the knife non-functional.
Innovation Solution
A knife design featuring a blade carrier with a release button that allows for easy insertion and removal of replaceable blades in a parallel direction, eliminating the need for separate parts and reducing the complexity of the interconnection process, ensuring safety and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate threaded fastener is used to lock the blade carrier, then the blade can be securely attached, but the blade replacement process becomes complicated and time-consuming
Solution Approach 1:
The patent removes the separate threaded fastener from the blade carrier assembly. Instead, the blade carrier itself is designed with an integrated locking mechanism that includes a locking surface and engagement features directly formed on the carrier body, eliminating the need for external fasteners and simplifying the replacement process.
Solution Approach 2:
The locking function previously performed by a separate fastener is merged into the blade carrier structure. The carrier now incorporates the locking surface, engagement features, and blade retention mechanism as integrated components, reducing the total number of parts and simplifying assembly.
2Reliability
If a separate threaded fastener is used to lock the blade carrier, then the blade can be securely attached, but the replacement process requires both hands and increases injury risk
Solution Approach 1:
The patent removes the separate threaded fastener that required manual manipulation with both hands. The integrated locking mechanism allows the blade to be secured and released through a simpler operation that can be performed with one hand, reducing the risk of injury during blade replacement.
Solution Approach 2:
The blade carrier's integrated locking mechanism is designed to automatically engage and secure the blade without requiring manual manipulation of separate fasteners. The system provides self-securing functionality through its geometric engagement features, allowing safe one-handed operation.
3Reliability
If a separate threaded fastener is used to lock the blade carrier, then the blade can be securely attached, but small parts can be easily dropped and lost
Solution Approach 1:
The patent eliminates the separate threaded fastener and its associated small parts that can be easily dropped and lost. The locking functionality is achieved through integrated geometric features on the blade carrier itself, removing the source of potential part loss entirely.
Solution Approach 2:
The fastening function is merged into the blade carrier structure through integrated locking surfaces and engagement features. This consolidation eliminates separate fastener parts that could be lost, as the retention mechanism becomes an inherent part of the carrier assembly.
4Reliability
If the blade is inserted at an angle and rotated into place, then the blade can be secured, but the replacement process becomes difficult and time-consuming
Solution Approach 1:
Instead of inserting the blade at an angle and rotating it into place, the patent inverts the approach by designing the blade carrier with a linear insertion path. The blade is inserted directly in line with the carrier's longitudinal axis, and the locking mechanism engages automatically during this straightforward insertion motion, eliminating complex angular manipulation.
5Reliability
If the blade carrier has multiple separate parts, then the locking mechanism can be robust, but the interconnection process becomes complicated
Solution Approach 1:
The patent merges multiple separate parts of the blade carrier into a single integrated component. The carrier incorporates the locking surface, engagement features, and blade retention mechanism as unified structural elements, reducing complexity while maintaining robust locking functionality through geometric integration.
Data Source
Figure 1
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AI summary
A knife is provided that includes a replaceable blade element. The knife employs a blade carrier that is fixedly interconnected to or foldable with respect to a handle. The blade earner selectively receives the replaceable blade element that is locked into the blade earner by way of a hook and movable pin combination. The replaceable blade element is designed to be inserted within the blade earner quickly, easily, and safely.