Lever Device Linkage Mechanism for Custom Tool Paths
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Solution Overview
Problem
Conventional lever devices, such as pliers and wrenches, typically follow a rotational path centered at the hinge, limiting their functionality and adaptability for creating different tool paths without compromising their basic function.
Innovation Solution
A lever device comprising a first and second lever, first and second tool, and first and second bar, pivotally connected to create a modified motion path, with optional spring assistance, allowing for varied tool paths by adjusting the length and position of the bars and pivots, enabling applications like jaw exercisers, tweezers, and spreaders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional lever devices use a basic pliers structure with handles hinged along their body, then the structure is simple and easy to manufacture, but the tool path is limited to rotation around the central hinge without adaptability for different functions
Solution Approach 1:
The device is divided into separate functional modules: a lever assembly with movable jaw, a fixed jaw assembly, and a linkage mechanism. This segmentation allows each component to perform its specific function while enabling the overall system to achieve complex tool paths through coordinated motion of independent segments, resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The lever device is designed with interchangeable tool faces and adjustable linkage configurations that can perform multiple functions including gripping, spreading, and specialized dental procedures. The universal lever mechanism can accommodate different tool paths by reconfiguring the linkage, providing multi-functionality without requiring completely different device structures for each application.
2Adaptability or versatility
If tools are modified to create different functions by adding slides and arms, then functional versatility is improved, but the device complexity increases and the tool path cannot achieve a declining relation with a radial point in front of the tool
Solution Approach 1:
A linkage mechanism acts as an intermediary between the lever assembly and the tool faces, translating the simple rotational motion of the lever into complex tool paths. This intermediary mechanism enables the tools to achieve declining relations with radial points in front of the tool without requiring complex slides and arms directly on each tool, maintaining simplicity while achieving functional versatility.
3Measurement precision
If the tool path is changed to create a declining relation with a radial point in front of the tool, then precision and control for specific applications are improved, but the device complexity increases
Solution Approach 1:
The linkage mechanism is designed with curved arms and pivots that naturally guide the tool faces along precise declining paths with radial points in front of the tools. The curved geometry of the linkage components inherently provides the desired tool path precision without requiring complex control systems or multiple adjustment mechanisms, achieving precision through elegant geometric design rather than complexity.
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 the creation of predetermined tool paths that deviate from the traditional arc, enhancing functionality and adaptability, such as mimicking jaw motion for dental therapy or providing precise gripping, while maintaining structural integrity and user safety through adjustable limit structures.
Implementation Method 1
The lever device can include a spring to provide force on the device
Data Source
AI summary
A lever device includes first and second levers coupled at a lever pivot. First end of a first bar is pivotally coupled to the first lever at a first lever-bar pivot. First end of a second bar is pivotally coupled to the second lever at a second lever-bar pivot. First tool is pivotally coupled to a distal end of the first lever at a first lever-tool pivot. Second end of the first tool is pivotally coupled to the second end of the second bar. Second tool is pivotally coupled to the second lever at a second lever-tool pivot and a second end of the lever is pivotally coupled to the second end of the second bar. First lever-bar pivot is between the lever pivot and a distal end of the first lever and the second lever-bar pivot is between the lever pivot and a distal end of the second lever.