Earthing Contact Fastening Device for Metallic Protective Tubes
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Solution Overview
Problem
Existing earthing contact designs for metallic protective tubes are complex and require indirect connections, which can lead to instability and inefficiencies in establishing a reliable earth connection.
Innovation Solution
A fastening device with an annular guide eyelet and half-shell-shaped clamping jaws is used to directly stabilize and fix the earthing contact to the metallic protective tube, utilizing a wire end ferrule or ultrasonic compaction to form a monolithic conductor end, and incorporating ribs and a receiving groove for secure engagement with the tube's helical outer sheath.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an indirect connection is used to connect the earthing contact to the metallic protective tube, then the design is more complex with additional components, but the connection stability and reliability deteriorate
Solution Approach 1:
The invention removes the intermediate comb-like or fork-like earthing contact from the connection path. The earthing wire is directly connected to the metallic protective tube through a simplified fastening device, eliminating unnecessary intermediate components and reducing design complexity while improving connection reliability.
Solution Approach 2:
The fastening device combines the functions of mechanical fastening and electrical connection into a single integrated structure. The clamping jaws simultaneously secure the earthing wire and establish electrical contact with the protective tube, merging two functions into one component system.
2Device complexity
If the earthing contact is indirectly connected through intermediate components, then the design allows for more components, but the connection stability deteriorates due to multiple contact points
Solution Approach 1:
The intermediate comb-like or fork-like earthing contact is removed from the system. The earthing wire is directly fastened to the protective tube, reducing the number of components and eliminating potential instability from multiple contact points.
Solution Approach 2:
The fastening device is divided into functional segments (guide eyelet, fixed clamping jaw, loose clamping jaw) that work together to provide both mechanical stability and electrical contact, achieving connection stability with fewer overall components.
3Device complexity
If a simple direct contact design is used, then the design is simplified, but the connection may be unstable without proper fastening mechanisms
Solution Approach 1:
The fastening device merges mechanical fastening and electrical contact functions into a single integrated structure. The clamping jaws provide mechanical securing while simultaneously establishing stable electrical contact, achieving both simplicity and stability.
Solution Approach 2:
The loose clamping jaw can be dynamically adjusted and secured in different positions along the protective tube, allowing the connection to adapt to various installation conditions while maintaining stability through the screw fastening mechanism.
Data Source
AI summary
A fastening device for fastening an earthing contact to a metallic protective tube. The fastening device includes an annular guide eyelet having an end face, a half-shell-shaped fixed clamping jaw which is integrally molded on the end face, and a loose clamping jaw configured to be clamped to the fixed clamping jaw. In an assembled state, the half-shell-shaped fixed clamping jaw and the loose clamping jaw are configured to clamp the metallic protective tube. The fastening device further includes at least one of the half-shell-shaped fixed clamping jaw and the loose clamping jaw comprising a receptacle-forming clamping jaw having an inner surface that forms a receptacle configured to receive the earthing contact.