Rotary Locking Element for Circuit Breaker Switch-On Button
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Solution Overview
Problem
Existing locking mechanisms for circuit breaker switch-on buttons are complex and costly, failing to effectively prevent re-actuation when the circuit breaker is already switched on.
Innovation Solution
A simple and inexpensive locking mechanism featuring a rotatably mounted locking element, retained by first and second springs, which transitions from allowing actuation to locking the switch-on button once the circuit breaker is switched on, using a locking bolt that engages in a support plate recess to maintain the reclosure interlock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is implemented to prevent re-actuation of the switch-on button when the circuit breaker is already switched on, then reliability is improved, but device complexity increases
Solution Approach 1:
The locking element is integrated directly into the switch-on button assembly, combining the locking function with the existing button structure. This eliminates the need for separate locking mechanisms while achieving reliable reclosure interlock prevention.
Solution Approach 2:
A locking element with a locking bolt acts as an intermediary between the switch-on button and the support plate. When engaged with the locking recess in the support plate, it mechanically prevents re-actuation of the button, providing simple yet effective locking functionality.
2Reliability
If a locking mechanism with multiple components is used to ensure effective locking, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The locking mechanism is segmented into simple, discrete components: a locking element with a locking bolt, a support plate with a locking recess, and two springs. Each component is independently manufacturable using standard processes, reducing overall manufacturing complexity and cost while maintaining reliable locking effectiveness.
Solution Approach 2:
The locking mechanism uses simple, inexpensive components that can be easily manufactured and replaced if needed. The springs and locking element are designed as basic mechanical parts rather than complex assemblies, significantly reducing manufacturing costs while maintaining functional reliability.
3Ease of operation
If a rotatable locking element with spring retention is used, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The locking element is designed to rotate between two positions: engaged with the locking recess (locked state) and disengaged (unlocked state). This rotational movement provides intuitive ease of operation for switching while maintaining a simple mechanical structure without complex actuation mechanisms.
Solution Approach 2:
The two springs automatically retain the locking element in its appropriate position based on the circuit breaker state. The first spring engages when the circuit breaker is OFF, and the second spring engages when ON, eliminating the need for additional actuators or complex control mechanisms to operate the locking 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 solution provides a reliable and cost-effective reclosure interlock that prevents re-actuation of the switch-on button when the circuit breaker is ON, ensuring the closing spring remains re-loaded and the circuit breaker remains in its switched state.
Implementation Method 1
retained in a first position directly by a first spring
Implementation Method 2
can be moved directly by a second spring to a second position, wherein in the second position the switch-on button of the circuit breaker is locked against actuation
Data Source
AI summary
In order to form a locking mechanism for a switch-on button of a circuit breaker which has a simple and inexpensive configuration, the locking mechanism has a locking element which is mounted rotatably on the switch-on button. The locking element, held directly in a first position by a first spring, enables actuation of the switch-on button and, directly in the switched-on state of the circuit breaker by a second spring, can be moved into a second position. The switch-on button of the circuit breaker is locked to prevent actuation in the second position.