Cable Sleeve Application for Low-Friction Conduit Insertion
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Solution Overview
Problem
Positioning new cables into underground communication conduits is challenging due to friction with existing cables, especially when the conduit contains undulating cables, which can damage the new cable as it is inserted.
Innovation Solution
A device that applies a sleeve with a lower coefficient of friction around the cable as it is being introduced into the conduit, using a mechanism with formers and attachment members to align and secure the sleeve, allowing for one-step installation and reducing damage from friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a cable is inserted directly into a conduit with existing cables, then the installation process is simple, but friction between cables causes damage and installation difficulty
Solution Approach 1:
A fabric sleeve acts as an intermediary between the cable and the conduit environment. The sleeve is positioned around the cable before insertion, providing a low-friction interface that protects the cable jacket from direct contact with undulating cables in the conduit, thereby reducing friction damage while maintaining installation simplicity
2Object-affected harmful factors
If a fabric innerduct is installed first to divide the conduit, then friction is reduced on the cable, but the installation process becomes two-step and more complex
Solution Approach 1:
The invention merges the sleeve application step with the cable insertion step into a single integrated operation. The sleeve is pre-positioned around the cable at the insertion point, eliminating the need for a separate innerduct installation step, thus reducing process complexity while maintaining friction reduction benefits
3Object-affected harmful factors
If a sleeve is applied around the cable before insertion, then friction is reduced and cable protection is improved, but the device complexity increases
Solution Approach 1:
The sleeve application mechanism is designed to be self-positioning and self-aligning. The sleeve is fed through a guide system that automatically positions it around the cable without requiring complex alignment procedures or multiple adjustment mechanisms, thereby reducing device complexity while achieving effective sleeve application
Data Source
AI summary
A fabric sleeve in the form of a strip of material having compatible attachment members along its lateral edges, is applied to a cable by a device located at a site where the cable can be introduced into a conduit. The device includes a beam carried by a post. The beam carries a plurality of formers which receive the sleeve and the cable from rolls and which progressively fold the sleeve around the cable. The beam also carries an attachment device which receives the sleeve and cable from the formers and which connects the attachment members of the sleeve to confine the cable therein. The attachment device can be opened so that the sleeved cable can be removed. The device is operated at the site until the sleeved cable reaches a downstream installation site and the process is repeated at that downstream site.