Push-to-Trip Mechanism for Circuit Breaker Handle Assembly
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Solution Overview
Problem
Existing electrical switching apparatus, such as circuit breakers, face difficulties in accessing the push-to-trip button due to it being covered by the handle assembly casing, making it hard to activate without removing the casing.
Innovation Solution
A push-to-trip mechanism with an actuating member and resilient element, allowing the push-to-trip button to be accessed from the exterior of the handle assembly casing, enabling quick and easy activation without removing the casing, featuring an actuating member with a protrusion for positioning and a resilient element for biasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handle assembly casing is used to enclose the circuit breaker components, then the internal components are protected and organized, but the push-to-trip button becomes inaccessible from the exterior
Solution Approach 1:
The actuating member is nested within the aperture of the handle assembly casing, allowing the push-to-trip button to be accessed through the casing without removing it. The actuating member extends through the aperture, with its head positioned on the exterior side, enabling users to activate the trip function while the button itself remains protected inside the casing.
Solution Approach 2:
The actuating member serves as an intermediary element that transfers the user's external actuation force to the internal push-to-trip button. The resilient element acts as a mediator that stores and releases energy to return the actuating member to its initial position after actuation, enabling repeated use without direct access to the button.
2Loss of time
If the push-to-trip button is positioned inside the handle assembly casing, then the internal components are protected, but activation requires removing the casing which increases time and complexity
Solution Approach 1:
The actuating member is pre-positioned within the aperture, with its head exposed on the exterior side of the casing. This preliminary arrangement allows users to immediately access and actuate the trip function without needing to remove the casing or perform any preliminary disassembly steps, significantly reducing activation time.
Solution Approach 2:
The resilient element automatically returns the actuating member to its initial unactuated position after the user releases it, enabling the mechanism to reset itself without user intervention. This self-service feature allows for rapid repeated actuations without requiring manual repositioning of components.
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 mechanism allows for efficient and easy activation of the push-to-trip button from the exterior, eliminating the need to remove the handle assembly casing, enhancing usability and accessibility.
Implementation Method 1
a resilient element biasing the actuating member toward the unactuated position
Data Source
AI summary
A push-to-trip mechanism is provided for a handle assembly for an electrical switching apparatus, such as circuit breaker. The handle assembly includes a casing coupled to the exterior of the circuit breaker housing over the push-to-trip button of the circuit breaker. The push-to-trip mechanism includes an actuating member at least partially disposed within an aperture of the casing. The actuating member is movable between an actuated position corresponding to the actuating member actuating the push-to-trip button, and an unactuated position corresponding to the actuating member not actuating the push-to-trip button. A resilient element biases the actuating member toward the unactuated position. The push-to-trip mechanism is operable from the exterior of the handle assembly casing, thereby enabling the push-to-trip button of the circuit breaker to be actuated, without removing the casing.