Modular Levering Assembly for Electrical Switching Apparatus
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Solution Overview
Problem
Existing electrical switching apparatuses, such as circuit breakers, require a unique levering assembly for each size, limiting adaptability and increasing costs due to the need for multiple assemblies for different sizes and hardware configurations.
Innovation Solution
A modular levering assembly that includes a base levering assembly and a drive shaft extension assembly, allowing the assembly to be adapted for use with various sizes of electrical switching apparatuses by increasing its width through a rotatable shaft extension, which can be aligned and coupled with the base assembly, enabling operation with different cassette and hardware configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a levering assembly is designed for a specific width to match electrical switching apparatus, then it provides precise fit and proper mechanical engagement, but it cannot be used with apparatus of different sizes, requiring multiple assemblies
Solution Approach 1:
The levering assembly is divided into a base assembly and a removable extension assembly. The base assembly contains the drive shaft and mounting structure, while the extension assembly can be attached to increase the width. This segmentation allows the same base assembly to work with different apparatus sizes by simply changing the extension component.
Solution Approach 2:
The base levering assembly is designed as a universal platform that can accommodate multiple apparatus widths when combined with different extension assemblies. The mounting member and drive assembly are configured to work with various extension sizes, making a single base assembly suitable for multiple applications.
2Reliability
If multiple levering assemblies are manufactured for different apparatus sizes, then each size has a dedicated fit, but inventory costs and complexity increase
Solution Approach 1:
By segmenting the levering assembly into modular components (base assembly and interchangeable extensions), the system maintains proper fit for different apparatus sizes while reducing the number of complete assemblies that need to be inventoried. Only the extension components need to be stored in multiple sizes.
Solution Approach 2:
The extension assembly is designed to attach to and extend from the base assembly, similar to nested dolls. This allows the compact base assembly to serve multiple purposes when combined with different extension 'layers,' reducing the overall inventory footprint.
3Ease of manufacture
If a levering assembly has fixed width, then manufacturing is simplified, but adaptability to different apparatus widths is lost
Solution Approach 1:
The levering assembly is segmented into a standard base portion that can be manufactured once, and interchangeable extension portions for different widths. This maintains manufacturing simplicity for the base assembly while providing adaptability through the extension components.
Solution Approach 2:
The levering assembly transitions from a static, fixed-width design to a dynamic, adjustable configuration. The removable extension assembly allows the width to be changed based on the apparatus being installed, while the base assembly remains a simple, standardized component.
Data Source
AI summary
A drive shaft extension assembly is provided for an electrical switching apparatus which is removably disposed in a cassette. The electrical switching apparatus includes a levering assembly with a drive shaft. The drive shaft extension assembly includes a housing assembly, a shaft extension including an elongated body, and a racking gear. The shaft extension is structured to be coupled to the drive shaft in a fixed orientation, thereby increasing the width of the levering assembly.