Folding Knife Blade Replacement Structure for Hard Object Cutting
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Solution Overview
Problem
Existing folding utility knives with trapezoidal blades are not suitable for cutting hard objects, such as fruits, due to the blade's thinness and low strength.
Innovation Solution
A blade replacement structure featuring a blade holder with a first clamp plate, a second clamp plate, a spacer, and a first elastic member, which provides a stable and reliable connection between the blade and the holder, allowing for easy blade replacement and accommodating blades of varying sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a trapezoidal blade is used in the folding utility knife, then the blade can be easily replaced, but the blade is thin and low in strength, making it unsuitable for cutting hard objects
Solution Approach 1:
The blade holder is divided into multiple functional components: first clamp plate, second clamp plate, spacer, and first elastic member. This segmentation allows each component to perform its specific function - the clamp plates provide clamping force, the spacer provides structural separation and positioning, and the elastic member provides elastic force for locking. This modular segmentation enables the use of stronger, thicker blades while maintaining ease of replacement through the coordinated action of these separate components.
Solution Approach 2:
The blade holder employs dynamic elements including the first elastic member that provides elastic force for locking the blade, and the press-mode switch that allows dynamic release of the locking mechanism. The spacer is designed to be movable relative to the clamp plates, allowing it to move forward to release the blade for replacement. This dynamic design enables both strong blade retention during use and easy blade replacement when needed.
2Strength
If a thicker, stronger blade is used to cut hard objects, then the blade strength is improved, but the blade replacement process becomes more complex
Solution Approach 1:
The blade holder is segmented into distinct functional components (first clamp plate, second clamp plate, spacer, first elastic member) that can be manufactured separately and then assembled. This segmentation allows for optimized design of each component - the clamp plates can be designed for maximum clamping force, the spacer for precise positioning, and the elastic member for appropriate elasticity. The modular nature simplifies manufacturing and maintenance while supporting stronger blade designs.
Solution Approach 2:
The spacer acts as an intermediary element between the first clamp plate and second clamp plate. It provides structural separation, positioning, and support while allowing controlled movement. The spacer includes a through-hole that receives the first elastic member, and its positioning relative to the clamp plates ensures proper alignment and spacing. This intermediary component simplifies the overall structure by providing multiple functions in a single element, reducing the need for additional complex mechanisms.
3Device complexity
If a simple blade holder structure is used, then the device complexity is reduced, but the connection between blade and holder is not stable and reliable
Solution Approach 1:
The blade holder merges multiple functions into a coordinated system of components: the first clamp plate and second clamp plate provide clamping function, the spacer provides positioning and structural support function, and the first elastic member provides locking function. These merged functions work together to create a stable and reliable connection. The press-mode switch merges the release function with the existing structure, allowing simple operation. This merging of functions achieves high reliability without excessive complexity.
Solution Approach 2:
The first elastic member is designed to automatically engage with the blade's locking structure when the blade is inserted into the blade holder. The elastic force of the first elastic member automatically locks the blade in place without requiring additional manual operations. This self-locking mechanism provides reliable connection while maintaining simplicity, as the system serves itself through the automatic engagement of the elastic member with the blade's locking features.
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 solution provides a stable and reliable connection between the blade and the holder, ensuring sufficient strength for cutting hard objects while allowing for convenient blade replacement and material efficiency.
Implementation Method 1
A first elastic member (221) is disposed in the blade embedding slot (24). The first elastic member (221) includes a first end and a second end. The first end of the first elastic member (221) is fixedly connected to the second clamp plate (22). The second end is disposed in the blade embedding slot (24), and is fixedly connected with a press-mode switch (25).
Data Source
AI summary
The present invention provides a folding knife containing a blade replacement structure, including a handle body (1), a blade holder (2), a blade (3), and a connection pin (4). The blade holder (2) includes a first clamp plate (21), a second clamp plate (22), a spacer (23), and an elastic member (221). The first clamp plate (21), the second clamp plate (22), and the spacer (23) together enclose an embedding slot that allows the blade to be inserted. When the folding knife is completely opened, a first slot (31) on the blade (3) fits with a first locking protrusion (231) on the spacer (23), and a second slot (32) on the blade (3) fits with a second locking protrusion on the elastic member (221). The blade holder (2) and the blade (3) can rotate around the connection pin (4) to be accommodated in the handle body (1).