Fiber Optic Installation Grip Bypassing Ferrule Load Path
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current fiber optic cables face challenges in increasing fiber density within fixed-size ductwork, as the configuration of connectors and furcation housings defines the cross-sectional area, making it difficult to route more optical fibers without damaging the fragile fibers or connectors during installation.
Innovation Solution
A streamlined installation grip for fiber optic cables that transfers tensile loads to strength members via a load path bypassing the ferrule and optical fibers, using a tubular body with slots and a clamshell configuration to secure the strength member, providing strain relief and allowing for efficient routing without a furcation housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a furcation housing is used to attach the installation grip to the strength members, then the tensile load path is properly established, but the cross-sectional area of the cable increases making it difficult to route through fixed-size ductwork
Solution Approach 1:
The patent removes the furcation housing from the cable assembly, extracting this bulky component that previously defined the minimum cable cross-sectional area. The installation grip is reconfigured to attach directly to strength members extending from the cable core, eliminating the need for the furcation housing while maintaining proper tensile load transfer pathways.
Solution Approach 2:
The installation grip is divided into distinct functional segments: a body portion that interfaces with the cable jacket, and attachment mechanisms (clamps, grips, or adhesives) that separately engage the strength members. This segmentation allows each component to be optimized independently, reducing overall dimensions while maintaining load transfer capability.
2Quantity of substance
If the installation grip is reduced in size to increase fiber density, then more fibers can be routed through ductwork, but the risk of damaging fragile optical fibers and connectors increases
Solution Approach 1:
The installation grip applies different local qualities to different components: the body portion provides encasement and protection for the ferrule and connector interfaces, while separate attachment mechanisms (such as clamps or adhesive layers) provide localized strain relief at specific points along the strength members, distributing protective functions throughout the assembly rather than relying on a single large housing.
3Reliability
If conventional installation grips extending over optical fibers are used, then fiber protection is improved, but the device complexity and cross-sectional area increase
Solution Approach 1:
The patent introduces an intermediary adhesive layer or bonding mechanism between the installation grip body and the strength members, eliminating the need for the grip to directly contact or extend over the optical fibers. This intermediary approach provides fiber protection through the bonding interface while keeping the grip structure compact and simple.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An installation grip for a fiber optic cable having an outer jacket, optical fibers, at least one strength member, and a ferrule terminating the optical fibers is disclosed. The installation grip includes a tubular body having an internal cavity configured to receive the ferrule, a pulling plug for connection to a tension member, and at least one slot through the installation grip. The at least one slot is configured to receive the at least one strength member of the fiber optic cable such that a tensile load imposed on the installation grip is transferred to the at last one strength member along a load path that bypasses the ferrule. A method of preparing a fiber optic cable for installation in ductwork at an installation site and a method of installing a fiber optic cable using the installation grip are also disclosed.