Two-Part Retaining Nut for Narrow Cable Entry Assembly
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Solution Overview
Problem
Existing cable gland compression nuts are not suitable for use in very narrow cable entry openings and cannot withstand high mechanical loads, especially when a cable grommet or kink protection is already attached to the cable.
Innovation Solution
A compression nut designed with a conical pressing area between two inner diameters, allowing for effective force transmission to a clamping or sealing part, and constructed in two parts (a base body and a ring) that can be assembled after the cable is installed, enabling the nut to fit through narrow openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the compression nut is pushed onto the cable before the cable grommet is molded on, then the compression nut can be properly installed, but it cannot fit through narrow openings smaller than the compression nut itself
Solution Approach 1:
The compression nut is divided into two separate parts: a base body and a ring. The base body contains the internal thread and pressing area, while the ring can be detached and reattached. This segmentation allows the ring to be pushed onto the cable first through narrow openings, followed by the base body, enabling installation in tight spaces where the complete compression nut cannot pass through.
2Length of moving object
If the compression nut is designed to fit through narrow openings, then it can be installed in tight spaces, but it cannot withstand high mechanical forces
Solution Approach 1:
The ring component is designed to be dynamically attachable and detachable from the base body. During installation, the ring is temporarily separated to fit through narrow openings, then securely reattached to the base body using the external thread on the ring engaging with the second internal thread in the base body. This dynamic assembly approach allows the structure to adapt to installation constraints while maintaining full mechanical strength in the final assembled state.
3Reliability
If a cable grommet is sprayed or glued onto the cable during cable assembly, then environmental sealing is improved, but the compression nut cannot be pushed onto the cable afterward
Solution Approach 1:
The conventional sequence is inverted: instead of pushing the compression nut onto the cable first and then applying the cable grommet, the ring is pushed onto the cable first through narrow openings, the cable grommet is then applied to achieve environmental sealing, and finally the base body is attached to complete the assembly. This inverted sequence allows both the cable grommet sealing function and compression nut mechanical function to be achieved without interference.
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 compression nut effectively secures and seals cables in narrow spaces while withstanding high mechanical loads, even when a cable grommet is already attached, by providing a strong and environmentally sealed connection.
Implementation Method 1
The pressing area follows a conical shape from the first inner diameter to the second inner diameter. This conical design enables effective force transmission to the clamping or sealing part, generating radially inward force that compresses the cable and provides mechanical securing and sealing.
Implementation Method 2
An external thread is formed on the ring that extends around the ring and is designed to be screwed into a second internal thread formed in the base body on the feedthrough side. This threaded connection allows secure assembly of the ring to the base body after the cable is installed.
Data Source
Figure 1a~2b
Figure 3~5
Figure 6a~6b
AI summary
The invention relates to a retaining nut (1) for a threaded cable connection which is provided for special installation situations. Here, a subsequent assembly of the retaining nut on a cable (60) with an integrated cable sleeve (70) is not possible. According to the invention, the retaining nut (1) has a two-part construction comprising a main part (10) and a ring (15). By virtue of the two-part retaining nut (1), it is possible to arrange the ring (15) on the cable (60) behind the cable sleeve (70) at an earlier point in time in the assembly process. In this manner, the assembly of the cable (60) with the cable sleeve (70) and the ring (15) is ensured and a subsequent connection of the main part (10) and the ring (15) is made possible.