Cutout Door Flange and Notch Design for Faster Hook Engagement
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Solution Overview
Problem
Safely making and breaking connections to high-voltage power lines mounted high above the ground is difficult due to the small diameter of the pull ring on cutout doors, requiring significant effort and time for linemen to engage hooks.
Innovation Solution
Incorporating a flange or hook engaging portion on the cutout door that extends outwardly from the cylindrical body, providing a larger surface for easy engagement by the lineman's hook, and modifying the pull ring to include hook engaging features such as indented portions or cavities for improved grip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a small diameter pull ring is used on the cutout door, then the device maintains a compact structure, but it requires significant effort and time for linemen to engage hooks
Solution Approach 1:
The pull ring is segmented by adding indented portions that divide the circular opening into distinct engagement zones. These indents create predefined hook engagement points that guide the lineman's hook, making it easier to engage without requiring the hook to be precisely aligned with the center of the ring.
Solution Approach 2:
The pull ring transitions from a uniform circular opening to a non-uniform structure with localized indented portions. These indents create specific local regions that are optimized for hook engagement, providing better grip and leverage at critical points while maintaining the overall compact structure of the cutout door.
2Ease of operation
If a flange is added to the cutout door to provide larger engagement surface, then hook engagement becomes easier, but the device dimensions increase
Solution Approach 1:
The flange is designed to nest within the spatial envelope of the cutout door assembly. By positioning the flange adjacent to the cylindrical body and integrating it with the existing structure, the engagement surface is extended without significantly increasing the overall device footprint or requiring additional mounting space.
Solution Approach 2:
Instead of increasing the diameter of the pull ring or adding protruding elements that extend far from the body, the flange utilizes the radial dimension adjacent to the cylindrical body. This creates an extended engagement surface in a direction that does not significantly increase the device's primary dimensions, allowing hooks to engage more easily without substantially increasing device length.
Data Source
AI summary
An upper tube member for a cutout door of a power line connection includes a cylindrical body configured to receive one end of an insulating tube. A first flange extends in a first radial direction outwardly from the cylindrical body. A pull ring is connected to the first flange, defines a continuous ring opening, and extends in the first radial direction outwardly from the first flange. A second flange extends a predetermined distance in a second radial direction, opposite to the first radial direction, from an opposite side of the cylindrical body and is configured to engage a hook end of a lineman's pole.