Rotating Cable Bushing Lock for Variable Wall Thickness
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Solution Overview
Problem
Existing cable entry systems struggle to effectively and flexibly mount on wall elements of different thicknesses, with limited holding force against tensile loads and complex installation processes.
Innovation Solution
A cable bushing with a clamping element that engages behind an opening edge, an intermediate support, a union nut, and a rotatable support element that moves from an unlocked to a locked position to secure the cable entry, allowing for easy assembly and adaptation to various wall thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cable entry system with a plug-in part and securing part is used, then the cable can be passed through the wall in a sealed manner, but the holding force against tensile loads is limited and it can only be mounted on walls with certain thickness
Solution Approach 1:
The support element is designed to be rotatable relative to the clamping element, transforming from a static structure to a dynamic one. This rotational movement allows the support sections to move between unlocked and locked positions, enabling the cable entry system to adapt to different wall thicknesses while maintaining secure fixation
Solution Approach 2:
The support element is divided into multiple support sections that can independently engage with the locking sections of the clamping element. This segmentation allows flexible adaptation to various wall thicknesses while maintaining the sealing capability through the intermediate support and union nut assembly
2Adaptability or versatility
If a clamping element with spring bars and threaded socket is used, then it can be flexibly mounted on walls of different thicknesses, but the assembly process becomes complex and the axial extension is large
Solution Approach 1:
The support element is integrated with the clamping element through a rotational connection rather than requiring separate threaded sockets and nuts. This merging of functions reduces the number of components and simplifies the assembly process while maintaining adaptability to different wall thicknesses through the rotational adjustment mechanism
Solution Approach 2:
The static threaded connection is replaced with a dynamic rotational connection that allows the support element to be adjusted to different positions. This reduces the axial extension compared to threaded assemblies while providing the same adaptability to different wall thicknesses
3Strength
If multiple locking mechanisms are used to secure the clamping element, then the holding force against pull-out loads increases, but the assembly process becomes more time-consuming
Solution Approach 1:
The support element is pre-assembled with the clamping element in a nested configuration, with the support sections already positioned to engage with the locking sections. This preliminary arrangement eliminates the need for complex assembly steps while maintaining strong holding force through the rotational locking mechanism
Solution Approach 2:
The multiple static locking points are replaced with a single dynamic rotational movement that engages all locking sections simultaneously. This reduces assembly time from multiple discrete locking operations to one continuous rotational action while achieving the same holding force
Data Source
Figure 1
Figure 2A~2B
Figure 2C~3
AI summary
A cable bushing (1) for passing a cable (10) through an opening (9) in a wall element (8) comprises a clamping element (2) which can engage behind an edge of the opening (9) with a locking portion; an intermediate support piece (3) connected to the clamping element (2), a union nut (4) which can be screwed onto the intermediate support piece (3), and a support element (6) for partially supporting the clamping element (2) on an inner side, wherein the support element (6) is rotatable relative to the clamping element (2) through an angular range of less than 360° in order to move at least one support section (63) of the support element (6) from an unlocked position for mounting the clamping element (2) on the opening (9) of the wall element (8) into a locked position in which the at least one support section (63) supports the at least one locking section (21) of the clamping element (2) on an inner side.This allows the cable entry (1) to be installed effectively with just a few assembly steps.