Adjustable Sharpener Rack-and-Pinion Angle Control
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Solution Overview
Problem
Current adjustable sharpeners are large, heavy, and prone to flexing due to poorly supported abrasive elements, leading to inaccurate sharpening angles, and their complex adjustment mechanisms are cumbersome and difficult to synchronize.
Innovation Solution
An adjustable sharpener design featuring interconnected arms pivoted from the ends, with a rack-and-gear adjustment mechanism that allows for precise control of sharpening angles, reducing the device's size and complexity while ensuring accurate angle maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If adjustable arms are pivoted near the center of the arms, then the adjustment mechanism is simpler, but the abrasive elements lack adequate support causing flexing under pressure and decreased sharpening angle accuracy
Solution Approach 1:
The patent inverts the conventional pivot location from the center of the arms to the ends of the arms. This inversion provides adequate support for the abrasive elements, preventing flexing under pressure and maintaining sharpening angle accuracy, while still achieving a relatively simple adjustment mechanism through the interconnected arm design.
2Ease of operation
If adjustable arms are operated independently of each other, then each arm can be adjusted separately, but additional components are necessary and timing coordination becomes problematic
Solution Approach 1:
The patent merges the adjustment functions of multiple arms into a single interconnected mechanism. The arms are connected to each other and to a common adjuster, allowing them to be operated together as a unified system rather than independently. This reduces the number of separate adjustment components and eliminates timing coordination problems while maintaining ease of operation through the shared adjustment mechanism.
3Reliability
If the sharpener is designed for countertop positioning, then it provides stable sharpening, but it becomes large and heavy
Solution Approach 1:
The patent segments the sharpener into a compact configuration with interconnected arms that fold or collapse when not in use. The arms are connected in a way that allows the overall structure to be minimized, reducing size and weight while maintaining stability during sharpening operation. The body contains essential components in a space-efficient arrangement.
4Ease of manufacture
If the arms are long to accommodate component orientation, then components can be properly arranged, but the overall length of the sharpener increases
Solution Approach 1:
The patent rearranges components in three-dimensional space rather than along a single linear axis. The interconnected arms are positioned and oriented in multiple dimensions, allowing proper component arrangement without increasing the overall length of the sharpener. This spatial reconfiguration enables efficient use of available space while maintaining a compact form factor.
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 results in a compact, lightweight sharpener with improved sharpening angle accuracy and reduced complexity in the adjustment mechanism, enabling easier and more precise sharpening.
Implementation Method 1
said adjustment assembly comprises a rack connected to a gear
Data Source
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AI summary
An adjustable sharpener (10) including a body having two sharpening slots (14), a first arm with a first abrasive element connected to a second arm with a second abrasive element, and a third arm with a third abrasive element connected to a fourth arm with a fourth abrasive element. The first and second abrasive elements are positioned in the first sharpening slot (14), and the third and fourth abrasive elements are positioned in the second sharpening slot (14). The adjustable sharpener (10) also includes an adjuster (16) connected to the body and an adjustment assembly connected to the adjuster, the first arm and the third arm. Linear movement of the adjuster (16) causes rotational movement of the first arm and the third arm. In this regard, the adjuster (16) allows the user to manually increase or decrease the sharpening angle between the abrasive elements in the sharpening slots (14).