Adjustable Pivot Mechanism for Folding Knife Blade Stability
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Solution Overview
Problem
Folding knives with existing adjustable pivots lack structural support between handle halves, leading to blade loosening under stress due to insufficient rigidity at the pivot point, causing deflection and premature wear.
Innovation Solution
A fully adjustable pivot that independently regulates the distance between handle halves using a threaded pivot post with a timing mechanism, allowing for a rigid connection with fully tightened fasteners without restricting blade movement, and includes locking fasteners to secure the pivot post to the handle halves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional adjustable pivots are used to allow blade movement, then blade adjustability is improved, but structural rigidity deteriorates leading to blade loosening under stress
Solution Approach 1:
The pivot assembly is divided into distinct functional segments: a threaded pivot post for adjustment, a separate locking mechanism with set screw, and a rigid connection structure. This segmentation allows the adjustment function to be isolated from the rigid connection function, enabling both blade adjustability and structural rigidity to coexist without interfering with each other.
Solution Approach 2:
The pivot post is pre-threaded into the first handle half during manufacturing, establishing a rigid connection before the blade is even installed. This preliminary action ensures that the structural rigidity is already in place before any adjustment operations are performed, preventing blade loosening from the outset while still allowing subsequent adjustments.
2Stability of the object's composition
If pivot fasteners are fully tightened to increase rigidity, then structural stability is improved, but blade movement freedom deteriorates
Solution Approach 1:
The pivot system transitions from a static fully-tightened state to a dynamic adjustable state. The threaded pivot post allows the user to adjust the blade tension to achieve the optimal balance between stability and movement freedom. The locking mechanism with set screw then freezes this dynamic adjustment into a stable configuration, maintaining both rigidity and appropriate blade mobility.
Solution Approach 2:
The system allows changing the pivot parameters (blade tension, gap between handle halves) through the adjustable threaded mechanism. By modifying these parameters, the user can optimize the balance between pivot stability and blade movement freedom for different usage conditions, then lock the optimized parameters in place.
3Adaptability or versatility
If adjustable pivot mechanisms are added to enable blade tension adjustment, then adaptability is improved, but device complexity increases
Solution Approach 1:
The threaded pivot post serves multiple functions simultaneously: it provides structural support as a pivot axis, enables blade tension adjustment through threading, and acts as a timing mechanism to set the initial gap between handle halves. This multi-functionality reduces the need for separate adjustment components, thereby limiting the increase in device complexity despite the added adaptability.
Solution Approach 2:
The adjustable pivot mechanism is designed to be self-contained and self-regulating. The threaded pivot post automatically maintains the adjusted position through its threaded engagement, and the locking mechanism with set screw provides automatic locking without requiring additional actuators or complex control systems. This self-service design minimizes the complexity overhead of the adjustment capability.
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
This solution enhances assembly rigidity, reducing blade loosening under hard use by providing a rigid point of connection that withstands compressive and tensile loads, while maintaining adjustable blade tension and allowing for easy disassembly.
Implementation Method 1
a threaded pivot post with a timing mechanism, allowing for a rigid connection with fully tightened fasteners
Implementation Method 2
includes locking fasteners to secure the pivot post to the handle halves
Implementation Method 3
providing a rigid point of connection that withstands compressive and tensile loads
Data Source
AI summary
A folding knife (or tool) having opposing handle halves and at least one knife blade (or tool) pivotally attached there between by an adjustable pivot. The adjustable pivot is configured to rigidly connect the opposing handle halves at the pivot point under load from fully tightened fasteners. The distance between opposing handle halves is both adjustable and rigidly fixable, resulting in improved assembly resistance to deflection from shear and torsion loads and reduced tendency of the blade (or tool) to loosen under hard use.