Modular Terminal Block Spring-Cage Assembly
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Solution Overview
Problem
Existing terminal blocks used in current transformer measuring circuits face challenges in easy and flexible assembly of testing and switching accessories, with screw-based attachment being time-consuming and limited bridging options when a test plug socket is inserted.
Innovation Solution
The terminal block design features three function shafts and corresponding openings in the busbar, allowing for screwless assembly of test sockets, fixed bridges, and switching bridges, with captive latching to ensure secure and versatile accessory connections, and the ability to use torsion spring, screw, or tension spring terminals for adaptable connection technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screw-based attachment is used for accessories in terminal blocks, then secure connection is achieved, but assembly time increases and flexibility decreases
Solution Approach 1:
The patent replaces the screw-based mechanical attachment system with a spring-cage terminal system. The spring-cage terminals use elastic deformation of spring fingers to clamp and hold accessories securely without requiring screws, thereby eliminating the time-consuming screwing operation while maintaining reliable electrical and mechanical connection.
Solution Approach 2:
The spring-cage terminals automatically adjust and maintain contact pressure through their elastic mechanism. When an accessory is inserted, the spring fingers automatically deform and clamp onto the accessory, providing self-adjusting secure connection without requiring manual intervention for tightening or adjustment.
2Adaptability or versatility
If multiple accessories need to be assembled in terminal blocks, then functionality increases, but assembly complexity increases
Solution Approach 1:
The terminal block is divided into multiple independent terminal positions, each with its own spring-cage terminals. This segmentation allows different accessories to be installed at different positions independently, with each position being self-contained and using the same standardized mounting mechanism, thereby reducing overall assembly complexity despite increased functionality.
Data Source
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AI summary
Described is a modular terminal, in particular to be locked onto a support rail (2), comprising a terminal housing (3), a busbar (4), and two terminal elements (5, 6) for connecting two conductors to the busbar (4). Two functional slots (8, 9, 10) are formed at both connecting ends in the terminal housing (3). Corresponding to the first functional slot (8), a first connection possibility for a first test socket (11) or a test plug, and, corresponding to the second functional slot (9), a second connection possibility for a fixed link (12) or a jumper (13) are formed in the busbar (4). In order to be able to mount the testing and switching equipment in a particularly simple and flexible manner in the modular terminal, an additional third functional slot (10) is formed at both connecting ends in the terminal housing (3), a third connection possibility corresponding to the third functional slot (10) is formed at both connecting ends in the busbar (4), and the connection possibilities in the busbar (4) are designed as openings (14, 15, 16) into which test sockets (11), test plugs, fixed links (12), or jumpers (13) can be alternatively plugged.