Cable Sealing Assembly With Positive Locking Against Twist
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Solution Overview
Problem
Existing cable sealing devices struggle to reliably prevent twist and axial displacement between the cable and the sealing device, especially under pulling forces, which can damage the cable jacket and optical fiber elements. Additionally, these devices often require complex assembly and occupy excessive space when mounted with cable sealing and retaining devices.
Innovation Solution
The improved cable sealing device employs positive locking mechanisms on the attaching part's existing faces to securely mount the sealing device, utilizing a fixation part with outer positive locking faces and inner abutment faces to provide secure circumferential and longitudinal locking. This design includes a sealing part with an inner seal and outer seal, and a fixation part that can be easily mounted on the cable, ensuring reliable sealing and prevention of twist and displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cable sealing device uses a grip means with pressing force to secure the cable, then the device can be mounted on the cable, but it cannot reliably prevent twist and axial displacement under large pulling forces
Solution Approach 1:
The cable sealing device is divided into multiple functional components: a grip means for initial mounting, an attaching part with positive locking faces for secure attachment, and a sealing part for environmental protection. This segmentation allows each component to specialize in its function, with the attaching part providing the additional mechanical interlocking needed to prevent displacement under load while the grip means handles initial installation.
Solution Approach 2:
The attaching part features asymmetric positive locking faces with specific geometric configurations that provide directional locking. The abutment surfaces are positioned and oriented to resist axial displacement, while circumferential features prevent rotation. This asymmetric design creates a mechanical interlock that is strong in the directions where displacement must be prevented.
2Ease of operation
If the cable sealing device is mounted adjacent to the attaching part on a commonly known cable, then it can be installed, but the attaching part projects into the accommodating space reducing available space for operations and connectors
Solution Approach 1:
The positive locking faces and abutment surfaces are designed to engage in directions that do not require axial projection into the accommodating space. The circumferential and longitudinal locking occurs at the interface between the attaching part and cable, allowing the sealing device to be positioned without the attaching part encroaching on the internal working space needed for connectors and operations.
3Reliability
If the cable sealing device uses multiple parts including grip means and inner seal, then it can provide sealing function, but the assembly becomes complicated due to the plurality of parts and their small shape
Solution Approach 1:
The invention merges the sealing function and the attachment function into an integrated assembly. The sealing part is combined with the attaching part featuring positive locking faces, creating a unified component that provides both sealing and secure mechanical attachment. This reduces the number of separate parts that need to be handled and assembled, simplifying the overall assembly process while maintaining reliable sealing performance.
Data Source
AI summary
A cable sealing device including an attaching part securable to the cable; a fixation part adapted to be mountable on the attaching part; and a sealing part. The attaching part includes outer locking faces. The fixation part has inner abutment faces adapted to co-operate with the outer locking faces to axially and rotationally lock the fixation part relative to the attaching part. The sealing part includes an inner seal and an outer seal. The sealing part also includes a second securing arrangement that is configured to engage a first securing arrangement of the fixation part to axially and rotationally lock the sealing part to the fixation part.