Terminal Block With Integral Disconnect Switch
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Solution Overview
Problem
Current railroad signal systems face labor-intensive maintenance, safety issues, and inefficiencies in surge protection due to complex termination processes, unreliable disconnect mechanisms, and lack of clear visual cues for circuit disconnection and surge protection status.
Innovation Solution
A terminal block with an integral disconnect switch and surge protection cartridge, allowing for safe and efficient insulation testing, reduced installation time, and clear visual indicators for circuit status, which integrates a surge protection element in a Kelvin connection with field and house wires, and can be easily replaced without disconnecting the circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual wires are independently separated and tested with current technology, then insulation integrity can be verified, but the process becomes labor intensive and time consuming
Solution Approach 1:
The patent combines multiple wire testing functions into a single terminal block unit. The terminal block integrates multiple terminals, a built-in disconnect switch, and surge protection components, allowing simultaneous testing and maintenance of multiple circuits through a single access point rather than requiring separate handling of each individual wire.
Solution Approach 2:
The terminal block is designed as a modular unit that can be independently removed and replaced. This segmentation allows the entire terminal block assembly to be tested and maintained as one unit, reducing the time required compared to testing each wire individually while maintaining the reliability of insulation integrity verification.
2Ease of operation
If nuts and leaf springs are used for circuit disconnection, then circuits can be switched, but the system becomes unreliable when proper torque is not applied and nuts may become loose
Solution Approach 1:
The patent replaces the mechanical nut and leaf spring disconnect mechanism with a positive latching disconnect switch. This new mechanism provides reliable circuit disconnection through a simple switching action without requiring torque application, eliminating the reliability issues associated with loose nuts and improper tightening.
3Ease of manufacture
If threaded posts with exposed studs are used for termination, then wires can be connected, but safety issues arise when studs are exposed and energized
Solution Approach 1:
The patent nests the disconnect switch and surge protection components within the terminal block housing. This nested structure provides physical containment and insulation, preventing exposure of energized components while maintaining ease of wire termination through the structured terminal block design.
4Reliability
If surge protectors are separately mounted and bolted down, then surge protection is provided, but maintenance time increases and visual status indication is difficult
Solution Approach 1:
The patent merges the surge protection component with the terminal block into a single integrated unit. This combination allows the surge protector to be maintained and replaced along with the terminal block as one assembly, significantly reducing maintenance time compared to separately mounting and servicing surge protectors.
Solution Approach 2:
The patent incorporates visual status indication features into the integrated terminal block and surge protection assembly, allowing maintenance personnel to quickly assess the status of surge protection and circuit connections without difficult visual inspection of separately mounted components.
5Reliability
If heavy gauge field wires are stripped and bent and attached to ring terminals, then proper electrical connection is achieved, but termination time increases significantly
Solution Approach 1:
The patent extracts the time-consuming steps of wire stripping, bending, and ring terminal attachment from the termination process. The integrated terminal block design accepts wires in a simplified manner that eliminates these manual preparation steps while maintaining reliable electrical connections through the built-in terminal structure.
Data Source
AI summary
A terminal block is disclosed that includes a terminal body housing, a plurality of conductive elements arranged within the terminal body to create a continuous electrical path therethrough, and a disconnect switch integral the terminal body, the switch arranged to open the continuous electrical path and expose a terminal.