One-Sided Cable Gland Assembly with Elastic Retaining Tongues
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Solution Overview
Problem
Existing cable glands require assembly from both sides of the wall, making them cumbersome and time-consuming, especially in cramped spaces, and are limited in variability for different wall thicknesses, leading to high tool costs and storage requirements.
Innovation Solution
A cable gland design featuring an insertion sleeve with retaining tongues that allows for one-sided assembly, providing a clamping sleeve and insertion sleeve as separate components that can be connected via snap-in, threaded, or clamping connections, enabling adjustable length to accommodate various wall thicknesses and preventing spreading or rotation during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cable glands are assembled from both sides of the wall using traditional methods, then reliable anchoring and securing of the cable is achieved, but the assembly process becomes cumbersome and time-consuming, especially in cramped spaces
Solution Approach 1:
The cable gland is divided into two separate components: an insertion sleeve with retaining tongues that anchors in the bore, and a clamping sleeve with a clamping element that secures the cable. This segmentation allows the insertion sleeve to be installed from one side to provide reliable anchoring, while the clamping sleeve is subsequently attached to secure the cable, simplifying the assembly process especially in cramped spaces where access from both sides is limited
Solution Approach 2:
The insertion sleeve with elastic retaining tongues is pre-designed to be inserted through the bore from one side, where the retaining tongues automatically expand to engage the bore wall and provide preliminary anchoring. This preliminary action establishes a secure base before the clamping sleeve and clamping element are attached to complete the cable securing process
2Adaptability or versatility
If cable glands are designed with fixed thread lengths to accommodate different wall thicknesses, then variability for different wall thicknesses is provided, but tool costs and storage requirements increase
Solution Approach 1:
The insertion sleeve is designed with elastic retaining tongues that can dynamically adapt to different wall thicknesses and bore conditions. The elasticity allows the retaining tongues to flex during insertion and then expand to engage the bore wall securely, providing adaptability for various wall thicknesses without requiring multiple fixed designs with different thread lengths
Solution Approach 2:
The single insertion sleeve design with elastic retaining tongues serves multiple functions: it anchors the cable gland in the bore, accommodates different wall thicknesses through elastic deformation, and provides a universal base for attaching the clamping sleeve. This multi-functionality eliminates the need for multiple specialized components with different thread lengths, reducing tool costs and storage requirements
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
This design simplifies and accelerates the assembly process, allowing for reliable anchoring of the cable gland in a bore from one side, reducing assembly time and overhang issues in thin walls, while maintaining high holding forces and torque resistance.
Implementation Method 1
The resilient deformability of the retaining tabs allows the socket to be partially inserted through the bore with the retaining tabs in the second position thereby allowing the retaining surfaces of the retaining tabs to pass through the bore
Implementation Method 2
The centering surfaces of the retaining tongues achieve a frictional force in the circumferential direction that is sufficiently high to prevent the insertion sleeve from rotating with it when the thread is tightened
Implementation Method 3
the cable is then anchored in the clamping sleeve in a non-positive manner through the interaction of this clamping element with a conically tapering section of the clamping sleeve
Data Source
AI summary
The fitting has an insert sleeve (10) comprising a base body (14) comprising an outer surface whose diameter does not a nominal diameter. Two holding tongues (15, 16) are distributed over a periphery of the outer surface of the base body and have a holding surface (16b) outwardly extending from a centering surface (16a). The tongues are connected with the base body. Each tongue is moved from one position, in which the centering surface lies in outer diameter, into another position, in which the holding surface and centering surface lie in the outer diameter, against prestress force.