Cable Gland Friction Elements Prevent Cable Twisting
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Solution Overview
Problem
Existing cable screw connections face issues with limited radial and longitudinal clamping, structural instability, and material compromises, leading to potential cable damage and complexity in accommodating different cable diameters.
Innovation Solution
A cable screw connection featuring a hollow cylindrical assembly with a key surface and conical support surface, enhanced with radially-oriented structural elements for increased friction, and a sealing section with deformable pressing elements to ensure secure and gas-tight cable passage through a housing or cabinet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lamellar cage is used to seal the cable, then sealing is achieved, but the lamellae can break due to their fine structure and cable guidance stability is limited
Solution Approach 1:
The invention extracts the lamellar cage from the sealing mechanism and replaces it with a robust sealing element that has a pressure surface directly bearing against the support surface. This removes the fragile lamellar structure while maintaining sealing functionality through the friction connection between the pressure surface and support surface.
Solution Approach 2:
Instead of using a complex lamellar cage structure to achieve sealing, the invention inverts the approach by using a simple sealing element that relies on friction between surfaces. The sealing effect is achieved through the friction connection rather than through a complex mechanical cage structure.
2Reliability
If a double lamellar basket is used, then sealing is improved, but the structure becomes complex and manufacturing costs increase
Solution Approach 1:
The invention extracts both lamellar baskets and replaces them with a single sealing element that has a pressure surface. This simplifies the structure significantly while maintaining sealing reliability through the friction-based connection between the pressure surface and support surface.
Solution Approach 2:
The invention inverts the complex double lamellar basket approach by using a simple sealing element that achieves sealing through friction between surfaces. The sealing effect is obtained through the interaction of the pressure surface with the support surface rather than through complex mechanical structures.
3Ease of operation
If a sealing insert is rotatably mounted, then cable passage is enabled, but the cable can become twisted and actuation is not homogeneous
Solution Approach 1:
Instead of mounting the sealing insert rotatably to enable cable passage, the invention inverts the approach by providing a through-opening in the mounting sleeve that allows cable passage without rotation. The sealing element remains stationary while the cable passes freely through the opening.
4Manufacturing precision
If the sealing element is pressed against the support surface, then uniform clamping is achieved, but friction may cause twisting during tightening
Solution Approach 1:
The invention changes the friction parameter by providing a friction-reducing coating on the support surface. This reduces the friction between the pressure surface and support surface, preventing twisting of the cable during tightening while maintaining uniform clamping pressure through the conical geometry of the support surface.
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 provides uniform radial and longitudinal clamping, prevents cable twisting and damage, and accommodates various cable diameters with improved stability and ease of production, ensuring a secure and efficient cable routing system.
Implementation Method 1
structural elements which extend radially outwardly from the inner surface of the mounting sleeve and by means of which the mutual twisting of the sealing element and the mounting sleeve after a cable has been inserted and the cap nut is tightened is prevented or at least significantly reduced
Implementation Method 2
In particular, it has a conical support surface, against which a first pressure surface of a sealing part rests
Implementation Method 3
a sealing section with deformable pressing elements to ensure secure and gas-tight cable passage
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
The cable gland (1), which serves to guide a cable through a mounting opening (90) in a mounting wall (9), in particular a housing wall of an electrical device or an electrical cabinet, comprises a hollow cylindrical mounting sleeve (5), which includes a sleeve channel (40) for the passage of the cable (8), which includes a wrench surface (43) that may be rotatable, for applying a tool, which has at least one first external thread (41) by means of which a cap nut (2), which has a passage opening (20) for the passage of the cable, is held, and which has a preferably conical support surface (44) in the end region facing the cap nut (2), against which a first pressure surface (33) of a sealing part (3), which has a receiving channel (30) for the passage of the cable, rests.According to the invention, the support surface (44) preferably has radially extending structural elements (441) to increase the static and sliding friction between the first pressure surface (33) of the sealing part (3) and the support surface (44).