Connector Bushing Assembly for Junction Box Cable Protection
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Solution Overview
Problem
Existing bushings for electrical conduit connections suffer from poor protection against moisture, sharp edges, and complex assembly processes, making them difficult to install, especially in blind installations.
Innovation Solution
A connector assembly comprising a nut with engagement flanges, a liner for cable protection, and an optional grounding clamp, which facilitates easy cable insertion and removal while preventing moisture ingress and providing a secure, smooth passage through the junction box.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If prior bushings are used for conduit connections, then cable protection is provided, but the protection is poor against moisture and sharp edges
Solution Approach 1:
The connector assembly is divided into multiple functional components: a nut for securing the conduit, a liner for cable protection and moisture barrier, and engagement flanges for secure mounting. This segmentation allows each component to specialize in protecting against specific harmful factors - the liner provides smooth cable passage and moisture protection while the nut provides secure mechanical attachment
Solution Approach 2:
The connector assembly combines different materials with complementary properties - the nut appears to be made of metal or rigid plastic for structural strength and moisture resistance, while the liner is made of a softer, smoother material to protect the cable from sharp edges and provide a low-friction surface for cable insertion and removal
2Object-affected harmful factors
If prior bushings are used for conduit connections, then cable protection is provided, but the assembly process is complex and time-consuming
Solution Approach 1:
Multiple functions are merged into a single integrated assembly - the nut, liner, and engagement flanges are combined into one connector unit that simultaneously provides secure mounting, cable protection, and moisture barrier functions. This eliminates the need to assemble multiple separate components, greatly simplifying the installation process
Solution Approach 2:
The connector assembly serves multiple purposes: it secures the conduit to the junction box, protects the cable from sharp edges, provides a smooth passage for cable insertion and removal, and acts as a moisture barrier. This multi-functionality reduces the total number of components needed and simplifies the overall assembly process
3Object-affected harmful factors
If prior bushings are used for conduit connections, then cable protection is provided, but installation is difficult in blind conditions
Solution Approach 1:
The liner is made visually distinct from the nut through color or transparency differences, allowing the installer to see the liner's position and orientation during blind installation. This visual indication system enables proper assembly without requiring the installer to see the components clearly, greatly facilitating installation in dark or confined spaces
Solution Approach 2:
The liner's smooth, low-friction surface allows it to self-align and guide the cable during installation, reducing the need for precise manual positioning. The cable itself helps guide the liner into the correct position as it is inserted, making the installation process more forgiving and easier to perform blind
Data Source
AI summary
A connector/bushing assembly for electrical junction boxes includes a nut which may receive a male conduit/connector which extends through the wall of a junction box, and a liner situated within the nut. The nut receives the male connector within a nut junction end situated opposite from a nut entry end. The liner is received within the nut entry end to extend toward the nut junction end, and includes a floating portion near the nut junction end, with the floating portion defining a cylinder spaced from the inner diameter of the nut junction end so that the (cylindrical) male connector can be received within the nut junction end between the floating portion and the nut junction end.