Adjustable Elasticity Folding Knife Mechanism
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Solution Overview
Problem
Existing cross bar lock folding knives require complex and inefficient processes to adjust the elasticity of the pull rod springs, involving disassembly of multiple components, which complicates assembly, maintenance, and accurate elasticity adjustment.
Innovation Solution
A knife design with quickly adjustable elasticity, featuring a pair of pull rod springs and handle covers with an adjusting element that allows for elasticity adjustment without disassembling all components, using a sliding slot and multiple fixed insertion positions for the pull rod springs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If spindle nail screws and spacer sleeve fixing screws are detached to adjust pull rod spring force, then the elasticity can be adjusted, but multiple components must be disassembled leading to complex maintenance process
Solution Approach 1:
The adjusting element is segmented into a body portion and a adjusting portion that can be rotated independently. The adjusting portion can be rotated to move between different insertion positions (first, second, third positions) without requiring disassembly of the entire knife structure. This segmentation allows elasticity adjustment while maintaining overall structural integrity.
Solution Approach 2:
The adjusting element transitions from a static fixed position to a dynamic adjustable position. The adjusting portion can be rotated to change the insertion position of the pull rod spring, enabling dynamic adjustment of elasticity. The barbed portion can be positioned at different locations (first, second, third positions) to provide different elastic forces.
2Adaptability or versatility
If pull rod spring force is adjusted by changing receding positions, then elasticity changes, but assembly becomes difficult when reassembling all components
Solution Approach 1:
The adjusting element is pre-configured with multiple insertion positions (first, second, third positions) marked on its body portion. The barbed portion is designed to fit into corresponding slots in the handle cover at these predetermined positions. This preliminary arrangement of multiple positions eliminates the need for complex assembly adjustments during reassembly.
Solution Approach 2:
The knife structure is designed to be self-adjusting through the rotating adjusting element. The user can simply rotate the adjusting portion to the desired position and lock it with the fastener, without requiring external tools or complex assembly procedures. The barbed portion automatically engages with the handle cover slots at the selected position.
3Adaptability or versatility
If spindle nails are removed for adjustment, then pull rod spring position can be changed, but the position becomes non-unique and accurate elasticity adjustment is difficult
Solution Approach 1:
The adjusting element has different functional zones: the body portion provides structural support and positioning, while the adjusting portion provides rotational adjustment capability. The barbed portion is specifically designed with localized engagement features (slots) that correspond to precise positions in the handle cover. This local differentiation ensures accurate and repeatable elasticity adjustment.
Solution Approach 2:
The traditional spindle nail screw mechanism is replaced with a rotating adjusting element that uses angular rotation to achieve linear position changes. The adjusting portion rotates about an axis to move the barbed portion between different radial positions. This mechanical substitution provides more precise and controllable position adjustment compared to the previous spindle nail system.
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
Enables easy and accurate adjustment of the knife's elasticity by simply changing the insertion positions of the pull rod springs, improving assembly efficiency and facilitating maintenance by allowing easy replacement of the springs.
Implementation Method 1
The blade of the cross bar lock folding knives can be automatically and quickly pushed out of the handle by means of the resilience of a spring arranged between the blade and the handle
Implementation Method 2
the barbed portions of the pull rod springs are hooked in the sockets
Data Source
AI summary
A knife with quickly adjustable elasticity comprises a blade, a pair of pull rod springs and two handle covers arranged opposite to each other, wherein a receiving cavity for receiving the blade is reserved between the handle covers, an end, opposite to a blade tip, of the blade is connected to the handle covers by means of a spindle, assembly and disassembly holes are formed in corresponding positions of the two handle covers, one end of an adjusting element is mounted in the assembly and disassembly holes by means of an articulated shaft, and the other end of the adjusting element is locked to the handle covers by means of a fastener. When the force of the pull rod is adjusted, it is unnecessary to disassemble all components of the knife.