Mid-span Clamp Aligning Drop Cable Load Perpendicular to Main Span
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Solution Overview
Problem
Conventional mid-span clamping systems for optical fiber cable networks unnecessarily increase bending strain in main span cables due to concentrated loading from lateral drop cable runs, limiting the length of main span cables and requiring additional support structures like steel messenger wires.
Innovation Solution
A mid-span clamp system with a convex curved engagement surface and a rotational coupling that aligns the main span cable with its preferential bend axis, reducing bending strain by distributing the load perpendicular to the cable's strong axis, and eliminating the need for separate steel messenger wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional mid-span clamping systems are used to support drop cables, then the drop cable can be distributed from the main span cable, but bending strain in the main span cable is unnecessarily increased due to concentrated loading
Solution Approach 1:
The clamp incorporates a curved engagement surface with a specific radius of curvature that matches the main span cable's bend characteristics. This curved surface distributes the drop cable load along the cable's natural bend path rather than creating concentrated loading, thereby reducing bending strain while maintaining effective cable distribution support
2Length of stationary object
If conventional clamping systems are used, then cable support is provided, but the length of main span cables is limited due to increased bending strain
Solution Approach 1:
The invention changes the geometric parameters of the clamp, specifically the radius of curvature of the engagement surface, to match the main span cable's preferential bend characteristics. This parameter optimization allows the cable to bend naturally along its strong axis, reducing bending strain and enabling longer span lengths without additional support structures
3Reliability
If conventional clamping systems are used, then additional support structures like steel messenger wires are required, but device complexity increases
Solution Approach 1:
The clamp is designed to perform multiple functions: it secures the drop cable to the main span cable, distributes the load along the cable's natural bend path, and provides sufficient mechanical support without requiring additional messenger wires or support structures. This multi-functional design simplifies the overall system while maintaining reliability
Data Source
AI summary
A mid-span optical fiber cable support system is provided. The system includes a mid-span clamp system engaging a main span cable to support a mid-span later drop cable run. The mid-span clamping system includes a main span cable clamp engaging the main span cable, and a drop cable clamp engaging the drop cable. The drop cable clamp is supported from the main span cable such that the second portion of the drop cable extends away from the main span cable such that a load applied by the drop cable at the drop cable clamp is substantially perpendicular to the preferential bend axis of the main span cable. In addition, the main span cable clamp includes a bend strain reducing curved surface.