Knife Blade Carrier Preassembly for Safe Handover
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Solution Overview
Problem
Existing knives with blade replacement mechanisms are difficult to handle and manufacture, and require separate production for right-handed and left-handed models, posing risks during assembly and disassembly.
Innovation Solution
A knife design where the blade support is fixed to the second part, allowing movement between rear and front positions, and can be preassembled as a subassembly with handles, featuring longitudinal slots and T-shaped guide structures for secure attachment and disassembly, reducing the risk of accidental blade exposure and enabling easy conversion between right-handed and left-handed use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the blade support is made separable from the second part to enable blade replacement, then blade changeability is improved, but the risk of accidental blade exposure increases and assembly/disassembly becomes more complex
Solution Approach 1:
The knife is divided into separable parts: the first part (handle) and the second part (blade support assembly). The blade support can be detached from the second part, allowing blade replacement while maintaining safety through controlled separation mechanisms.
Solution Approach 2:
The blade support is pre-assembled with the second part as a subassembly before final attachment to the first part. This preliminary assembly ensures proper positioning and reduces the risk of accidental blade exposure during the final assembly step.
2Ease of operation
If separate production of right-handed and left-handed knives is implemented, then hand-specific ergonomics are improved, but manufacturing complexity and inventory requirements increase
Solution Approach 1:
The first part is designed as a universal component that can be attached to either left-handed or right-handed second parts. The symmetric attachment mechanism allows a single first part design to work with both hand preferences, reducing manufacturing complexity while maintaining ergonomic benefits.
Solution Approach 2:
The second part is designed with asymmetric features specific to left-handed or right-handed use, while the first part maintains symmetric attachment capability. This allows hand-specific ergonomics to be achieved through the replaceable second part without complicating the main handle structure.
3Object-affected harmful factors
If the blade support is firmly fixed to the second part to prevent accidental release, then safety is improved, but blade replacement becomes more difficult
Solution Approach 1:
The connection between blade support and second part is designed to be dynamically controllable - firmly fixed during normal use to prevent accidental release, but easily separable when intentionally actuated by the user for blade replacement.
Solution Approach 2:
A latch mechanism acts as an intermediary between the blade support and second part, providing secure fixation during use while allowing controlled release for blade replacement. The latch serves as the mediator that balances safety and replaceability requirements.
Data Source
AI summary
The invention relates, inter alia, to a knife with a housing comprising a first housing part (12) and a second housing part (13) and also a blade carrier (20), in which a blade (15) is retained, wherein the first housing part (12), in particular for a blade changeover, can be released from the second housing part (13) and fastened thereon again, wherein the blade carrier (20) is mounted in the housing (11) such that it can be moved between a basic position and a cutting position. The special feature is that the blade carrier (20) is connected to the second housing part (13) in a non-releasable manner, and that the blade carrier (20) and the second housing part (13) form a preassemblable structural unit which can be fastened on the first housing part (12) in a releasable manner.