Clamp Jaw Assembly Shielding for Creepage Path
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Solution Overview
Problem
Existing clamp meters face challenges in reducing jaw size to fit tight spaces without compromising safety standards, as minimizing the gap between the jaw core and housing reduces the creepage and clearance path, posing safety risks due to uneven tape application on curved surfaces.
Innovation Solution
A clamp jaw assembly design featuring a shield with a channel that surrounds the jaw core, increasing the creepage and clearance path without adding distance between the core and housing, using a nonconductive shield to enclose the jaw core, which simplifies assembly and prevents creasing or wrinkling of insulative materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the space between the jaw core and housing is minimized to reduce jaw size, then the jaw can fit in tight spaces, but the creepage and clearance path is reduced violating safety standards
Solution Approach 1:
The patent applies nesting by placing the insulating shield inside the jaw assembly, specifically positioning it between the jaw core and the housing. This nested configuration allows the shield to provide the required creepage and clearance path without increasing the overall jaw dimensions, enabling the jaw to fit in tight spaces while maintaining safety compliance.
Solution Approach 2:
The patent utilizes the radial dimension by positioning the insulating shield in the radial space between the jaw core and housing, rather than increasing the axial or lateral dimensions. This dimensional approach allows the creepage and clearance path to be extended in the radial direction, maintaining safety standards without increasing overall jaw size.
2Reliability
If insulating tape is manually applied to increase creepage and clearance path, then safety standards can be met, but assembly time increases and application quality is inconsistent
Solution Approach 1:
The patent employs a pre-formed insulating shield that is disposed of after a single use in each jaw assembly. This disposable component eliminates the need for time-consuming manual tape application and quality inspection, as the shield is pre-cut to the correct shape and size, ensuring consistent creepage and clearance path without requiring assembly time for manual application.
Solution Approach 2:
The insulating shield is pre-formed and pre-cut to the correct shape and size before assembly. This preliminary action ensures that the creepage and clearance path is correctly established without requiring time-consuming manual application and quality inspection during assembly, thereby reducing assembly time while maintaining safety compliance.
3Reliability
If insulating tape is applied to curved surfaces to increase clearance path, then safety can be improved, but the tape creases or wrinkles decreasing the clearance path
Solution Approach 1:
The patent uses a flexible insulating shield made from thin insulating material that can conform to the curved surface of the jaw core. This flexible shield maintains even contact with the curved surface without creasing or wrinkling, ensuring consistent creepage and clearance path while meeting safety standards.
Solution Approach 2:
The insulating shield is made from composite insulating material that combines flexibility with structural integrity. This composite material allows the shield to conform to curved surfaces without creasing or wrinkling, maintaining consistent creepage and clearance path for safety compliance.
Data Source
AI summary
A clamp jaw assembly for a clamp meter is provided. The clamp jaw assembly comprises a housing containing a clamp jaw core disposed within a shield. The housing, shield, and core of the clamp jaw assembly are configured to provide an extended creepage and clearance path from an exterior of the housing to a surface of the core.