Sealing System With Guide Feature For Elongate Members
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Solution Overview
Problem
Existing sealing methods for electrical cables, such as the use of mastic sealant tape and spiral holdouts, face issues with adhesion and environmental protection, as the rip cord can damage the mastic bead and compromise the seal, and the application of electrical tape can reduce the effective seal and require precise tension to avoid displacing the mastic.
Innovation Solution
A sealing system comprising a tubular substrate with an integral guide feature, a pre-expanded cover unit including a helically wound holdout and a tubular cover sleeve, and a flowable sealant, where the holdout is maintained in a radially elastically expanded state, allowing the cover sleeve to contract around the elongate member while preventing the rip cord from contacting the sealant, thus ensuring a secure and environmentally sealed joint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electrical tape is applied to protect the mastic surface from the rip cord, then the mastic surface is protected, but the effective seal width is reduced and the installation process becomes more complex
Solution Approach 1:
A guide feature (such as a guide flange or guide rib) is introduced as an intermediary element between the rip cord and the mastic sealant. This guide feature directs the rip cord along a predetermined path that prevents contact with the mastic surface, thereby protecting the sealant without requiring additional protective materials like electrical tape.
Solution Approach 2:
The guide feature is pre-formed as an integral part of the substrate or holdout structure before the sealing installation begins. This preliminary configuration ensures that the rip cord is automatically guided away from the mastic surface during the unraveling process, eliminating the need for installers to take additional protective actions during installation.
2Object-affected harmful factors
If electrical tape is used to prevent rip cord contact with mastic, then the mastic surface is protected, but the adhesion area between mastic and EPDM tube is reduced
Solution Approach 1:
The guide feature serves as a mediator that separates the rip cord's path from the mastic sealant surface. By providing a dedicated guidance structure, the mastic can be applied over the full width of the substrate without any protective tape, maximizing the adhesion area between the mastic and the EPDM seal tube while still protecting the mastic from rip cord damage.
3Object-affected harmful factors
If excessive tension is applied to electrical tape during installation, then the rip cord contact is prevented, but the mastic is displaced and creates new catch points
Solution Approach 1:
The guide feature provides a fixed, pre-positioned path for the rip cord that does not require applying tension to any protective material. This eliminates the risk of mastic displacement entirely, as the guide feature is structurally integrated and cannot be deformed or shifted during the installation process.
Solution Approach 2:
The guide feature is designed to automatically perform the protective function without requiring external intervention or additional materials. The structure itself provides the guidance and protection, eliminating the need for installer judgment and manual application of protective tape, thereby preventing mastic displacement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents damage to the mastic sealant during installation, maintains the integrity of the seal, and eliminates the need for additional protective measures like electrical tape, ensuring a reliable and environmentally sealed connection for electrical cables.
Implementation Method 1
The holdout maintains the cover sleeve in a radially elastically expanded state
Implementation Method 2
permit the cover sleeve to radially contract about the tubular substrate and the elongate member
Data Source
AI summary
A sealing system for forming an environmentally sealed joint with an elongate member includes a tubular substrate, a pre-expanded cover unit, and a flowable sealant. The tubular substrate includes an integral guide feature and defines a substrate bore to receive a portion of the elongate member. The pre-expanded cover unit includes a holdout and a tubular cover sleeve. The holdout includes a helically wound strip forming a tubular holdout body and a rip cord. The holdout body defines a holdout passage extending axially therethrough. The tubular cover sleeve is mounted on the holdout body. The holdout maintains the cover sleeve in a radially elastically expanded state. With the elongate member positioned with a portion thereof extending from the tubular substrate and a layer of the sealant mounted on an outer surface of the tubular substrate and/or on an outer surface of the elongate member, the pre-expandable unit can be mounted around the layer of sealant and the holdout can then be removed from the cover sleeve by withdrawing the rip cord through the holdout passage between the layer of the sealant and the holdout body to remove the holdout body and thereby permit the cover sleeve to radially contract about the tubular substrate and the elongate member, and the guide feature serves to prevent or inhibit the rip cord from contacting the layer of the sealant as the rip cord is withdrawn through the holdout passage.