Two-Piece Cable Lug Assembly for Confined-Space Crimping
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Solution Overview
Problem
Existing cable joining technologies face challenges when performing cable joints in confined spaces, as crimping tools cannot be accommodated to crimp compression lugs effectively.
Innovation Solution
The development of a two-piece compression joint lug assembly, where each lug can be crimped externally before installation, and then joined using fasteners with a handheld tightening tool, allowing for assembly in confined spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional one-piece compression lug is used, then the cable connection provides strong mechanical strength, but the crimping tool cannot be accommodated in confined spaces to perform crimping
Solution Approach 1:
The compression lug is divided into two separate pieces (first lug and second lug) that can be crimped independently on either side of the cable. This segmentation allows crimping operations to be performed in confined spaces without requiring accommodation of large crimping tools, while the two pieces are subsequently joined together to restore mechanical strength.
Solution Approach 2:
The first and second lugs are crimped onto the cable ends in advance before being assembled together. This preliminary crimping action allows the cable preparation to be completed separately from the final assembly, enabling work in confined spaces where the full assembly cannot be formed in one step.
2Productivity
If the cable joint is assembled in one piece, then the connection is structurally simple, but the installation time and cost increase due to on-site crimping requirements
Solution Approach 1:
The lugs are pre-crimped onto cable ends before site assembly, allowing cable preparation to be performed in advance at a more convenient location. This separates the crimping operation from the final installation, reducing on-site installation time and enabling parallel preparation of multiple cable sections.
Solution Approach 2:
The lug assembly is segmented into multiple components (first lug, second lug, fasteners) that can be prepared separately and assembled quickly on-site. This segmentation transforms a time-consuming single-step crimping operation into a faster multi-component assembly process.
3Reliability
If the lug is designed as a single piece, then the structural design is straightforward, but the connection cannot withstand high pulling forces when assembled in confined spaces
Solution Approach 1:
The lug is segmented into two pieces that are joined together using fasteners (bolts and nuts). This segmentation allows the connection to be assembled in confined spaces where a single large lug cannot be crimped, while the fastener connection maintains reliability under high pulling forces through proper mechanical fastening.
Solution Approach 2:
The connection method changes from monolithic crimping to fastened assembly, altering the mechanical parameters of the connection. The fastener-based joining provides comparable or superior load-bearing capacity while enabling assembly in confined spaces where traditional crimping is not feasible.
Data Source
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AI summary
The present invention provides two pieces of lugs, which can be crimped outside the assemblies individually before the installation of cables and later it must be joined by using fasteners at later stage when need to be connected by using a handheld tightening tool.