Knife With Tool-Operated Latch for Safe Blade Replacement
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Solution Overview
Problem
Existing safety knives with replaceable blades pose a high risk of injury during blade replacement due to exposure to unprotected cutting edges, as users must open the knife body to replace the blade, which is typically made of plastics and not designed for reuse.
Innovation Solution
A two-part knife body design with interengaging formations and a latch arrangement that requires a tool for opening, ensuring only trained individuals can access the blade replacement mechanism, reducing the risk of injury and allowing for blade replacement without disposing of the entire knife.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the knife body is made of plastics and not designed for reuse, then the manufacturing cost is low and the knife is simple to produce, but the blade cannot be replaced and the entire knife must be disposed of when the blade becomes worn
Solution Approach 1:
The knife body is divided into two separate parts: a reusable first body part and a replaceable second body part that contains the blade. This segmentation allows the blade to be replaced while retaining the investment in the main body structure, resolving the contradiction between low manufacturing cost and blade replaceability.
Solution Approach 2:
The design enables selective discarding of only the worn blade (second body part) while recovering and reusing the intact first body part. This partial discarding approach balances the need for blade replacement with cost efficiency, avoiding disposal of the entire knife when only the blade is worn.
2Ease of repair
If the knife body is made of two parts that can be opened to allow blade replacement, then blade replacement is enabled, but the user is exposed to unprotected blade cutting edges during the replacement process
Solution Approach 1:
A tool with a recessed blade is introduced as an intermediary device to perform the blade replacement. The tool's recessed blade protects the user's fingers from exposure to sharp cutting edges during the replacement process, while still enabling the removal and installation of the blade through the tool's mechanism.
Solution Approach 2:
The replacement tool is designed to perform the blade replacement function automatically without requiring the user to manually handle exposed cutting edges. The tool's recessed blade structure allows the replacement process to occur safely, with the tool itself protecting the user during the operation.
3Object-affected harmful factors
If the knife body is designed with a latch arrangement requiring a tool for opening, then unauthorized access is restricted and safety is improved, but the blade replacement process becomes more complex
Solution Approach 1:
The replacement tool serves dual functions: it acts as an intermediary to protect the user during blade replacement, and simultaneously serves as the key mechanism to operate the latch arrangement. This integration reduces the overall complexity by combining the safety protection function with the access control function in a single device.
Solution Approach 2:
The replacement tool is designed with multi-functionality: it provides finger protection during blade replacement and simultaneously operates the latch mechanism to enable access. This universal design achieves both safety restriction and controlled access without requiring separate complex mechanisms for each function.
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 restricts unauthorized access to the blade replacement process, minimizing the risk of injury and enabling the reuse of the knife by allowing only trained personnel to open the body, thus reducing waste and maintaining safety during blade changes.
Implementation Method 1
a resilient member carried by the first body part and cooperable with the second body part to latch the body parts against sliding movement towards the second position, and an opening provided in the second body part through which a tool can be inserted to depress the resilient member
Data Source
AI summary
A knife having a first body part and a second body part cooperating with one another to allow a blade to be secured thereto, the body parts cooperate with one another such that sliding movement of the first body part relative to the second body part can occur, and a latch arrangement whereby the body parts can be latched against relative sliding movement from a first position towards a second position, the latch arrangement having a resilient member carried by the first body part and cooperable with the second body part to latch the body parts against sliding movement towards the second position, and an opening provided in the second body part through which a tool can be inserted to depress the resilient member and allow such sliding movement to occur.