Circuit Breaker Trip Device Lever Position Feedback
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Solution Overview
Problem
Existing circuit breakers for electric wiring do not effectively allow users to easily recognize the ON-state when contacts between the mover and stator are fused, leading to potential safety risks due to incorrect manipulation of the manipulation lever.
Innovation Solution
A trip device with a resilient mechanism that maintains the manipulation lever in an ON-state when the mover and stator contacts are fused, utilizing a combination of link members and resilient forces to ensure the lever returns to the ON position, even during abnormal states or incorrect lever manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the manipulation lever is allowed to move freely when contacts are fused, then the lever can respond to trip conditions, but the user cannot easily recognize the actual contact state leading to safety risks
Solution Approach 1:
The patent uses visual indication through color changes or position differences of the manipulation lever to show the actual contact state. When contacts are fused, the lever maintains a specific visual state that clearly indicates the abnormal condition to users, resolving the contradiction between safety recognition and ease of operation.
Solution Approach 2:
The patent implements a feedback mechanism where the manipulation lever provides visual feedback about the actual contact state. The lever's position or appearance changes to reflect whether contacts are normal or fused, allowing users to easily recognize the system state and make informed decisions about safety.
2Reliability
If the manipulation lever is forced to move to OFF position when contacts are fused, then safety is improved, but the user cannot easily recognize the ON-state contact condition
Solution Approach 1:
The patent employs visual indicators that change color or position to preserve information about the contact state even when the lever is forced to the OFF position. This allows users to distinguish between a normal OFF state and an abnormal fused state, preventing loss of critical information while maintaining safety.
Solution Approach 2:
The patent introduces an intermediary visual indication mechanism that mediates between the lever position and the actual contact state. This intermediary provides additional information about the contact condition independent of the lever's physical position, ensuring both safety and information preservation.
3Reliability
If a complex locking mechanism is added to prevent incorrect manipulation, then safety is improved, but the device complexity increases
Solution Approach 1:
The patent implements a self-service mechanism where the system automatically detects fused contacts and prevents incorrect manipulation without requiring complex external locking mechanisms. The manipulation lever itself or associated simple components provide the safety function, reducing overall device complexity while improving reliability.
Solution Approach 2:
The patent merges the safety function with the existing manipulation lever structure, combining state indication and safety prevention into a unified simple mechanism. This integration avoids adding separate complex locking systems while achieving both safety improvement and maintaining simplicity.
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
This solution allows users to easily recognize the contact state and reduces the risk of accidents by maintaining the ON-state of the manipulation lever when contacts are fused, ensuring safety and preventing incorrect lever manipulation hazards.
Implementation Method 1
a first resilient member (120) returning the manipulation lever (110) to an ON position
Data Source
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AI summary
According to the present invention, a trip device and a circuit breaker for electric wiring having the same includes: a manipulation lever which rotates between ON/OFF or trip positions; a switching device which has a first elastic member to return the manipulation lever to the ON position; a locking member which stops the manipulation lever in the OFF position; a stator which is made of a conductor such that current can be induced and flow through the inside thereof; a mover which is rotated depending on whether abnormal current occurs to be in contact with or separated from the stator; and a multi-joint link member which releases the stopping of the locking member in cooperation with the manipulation lever, which rotates into the OFF position, when the mover and the stator are welded with each other.