Underplug Protection Part for Screw Clamp Terminals
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Solution Overview
Problem
Double-chamber screw terminals pose a risk of under-plugging due to the clamp frame moving upwards when the screw is tightened, making it difficult to ensure correct cable insertion, especially in poorly lit environments, which can lead to high contact resistance and potential destructive heating.
Innovation Solution
An underplug protection part with a closed frame shape that slides onto the clamping frame, featuring a cover apron and spring elements to prevent incorrect cable insertion, ensuring even force transmission and a stable fit, allowing the underplug protection part to be easily attached and guiding it within the installation device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a double-chamber terminal is used to allow connection of two conductors with different diameters, then the versatility and convenience of connection is improved, but the risk of under-insertion increases because the clamping frame moves upwards exposing a cavity beneath it
Solution Approach 1:
The patent applies preliminary anti-action by providing a protective insert that prevents under-insertion before the harmful effect can occur. The insert is positioned in advance to block access to the cavity beneath the clamping frame, thereby preventing the mistake of inserting conductors into the wrong location.
Solution Approach 2:
The protective insert acts as an intermediary element between the conductor and the cavity. It physically blocks the cavity from being accessed while allowing the legitimate connection function to proceed, thus mediating between the need for versatility and the risk of incorrect insertion.
2Ease of operation
If the clamping frame is made movable to enable proper clamping of conductors, then the clamping function is improved, but the visibility and detectability of correct insertion is worsened due to poor lighting and indirect visibility in installation areas
Solution Approach 1:
The protective insert features color-coded indicators (red and green sections) that provide visual feedback about the insertion state. The red section indicates when the conductor is correctly positioned, while the green section indicates incorrect insertion, making it easy to detect the insertion state even in poor lighting conditions.
Solution Approach 2:
The patent implements feedback through visual indicators on the protective insert that immediately inform the installer whether the conductor has been inserted correctly. This real-time feedback mechanism compensates for poor visibility and indirect observation conditions in installation areas.
3Reliability
If a protective insert is added to prevent under-insertion, then the reliability of correct insertion is improved, but the device complexity increases
Solution Approach 1:
The protective insert is designed to be nested within the terminal structure, sliding into a dedicated recess in the clamping frame. This nesting approach integrates the protective function into the existing device without requiring separate external components or complex assembly procedures.
Solution Approach 2:
The patent merges multiple functions into the protective insert: it simultaneously provides mechanical protection against under-insertion, visual feedback through color indicators, and guidance for correct conductor placement. This consolidation reduces overall device complexity compared to having separate components for each function.
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 underplug protection part effectively prevents under-plugging by maintaining the upper chamber open and the lower chamber closed, except for a small gap for busbar contact tabs, ensuring secure and correct cable insertion, reducing the risk of high contact resistance and heating issues.
Implementation Method 1
At least one spring element is integrally formed on the second transverse element. The spring element is designed such that elastic deformation of the spring element, which occurs when the under-plug protection part moves in a direction parallel to the longitudinal elements from the first transverse element to the second transverse element, results in a restoring force in the opposite direction.
Data Source
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AI summary
The invention relates to an under-plug protection part (1) for sliding onto a clamping frame (2) of a screw clamp (3), - wherein the under-plug protection part (1) has the form of a closed frame, which has two opposing longitudinal elements (L1, L2) and a first and a second transverse element (Q1, Q2) which are opposite each other and connect the longitudinal elements to each other, - wherein the first transverse element (Q1) has a through-opening (A) for passing a screw shaft and - wherein a cover apron (S) serving as under-plug protection is formed onto the second transverse element (Q2).