Cabinet Door Locking Mechanism for Circuit Breaker Safety
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Solution Overview
Problem
Existing electrical circuit switching devices lack a secure mechanism to prevent accidental switching from the OFF to the ON position, which can lead to unintended power activation.
Innovation Solution
A door-mounted locking mechanism with a latch and interlock system that uses a key to move a driving member against the latch, blocking the plate's movement to the ON position, ensuring secure switching by utilizing a spring-biased latch and a key-operated lock bolt to maintain the latch in a locked position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple handle mechanism is used for switching, then ease of operation is improved, but reliability is worsened due to lack of protection against accidental switching
Solution Approach 1:
A latch mechanism is introduced as an intermediary between the handle and the plate. The latch normally permits plate movement but can be engaged to block plate movement entirely. This intermediary component resolves the contradiction by allowing easy operation when needed while providing reliable protection against accidental switching when the latch is engaged.
Solution Approach 2:
The switching mechanism is segmented into separate functional components: the handle for operation, the latch for protection, and the plate for actual switching. This segmentation allows each component to specialize in its function - the handle provides ease of operation while the latch provides reliability protection, resolving the contradiction between these two requirements.
2Reliability
If a locking mechanism is added to prevent accidental switching, then reliability is improved, but device complexity is worsened
Solution Approach 1:
The latch mechanism is designed to be self-servicing through spring biasing. The spring automatically returns the latch to its permissive position when not engaged, and the latch itself blocks plate movement when engaged. This self-service design minimizes the need for additional complex control systems while maintaining reliability protection.
3Reliability
If a spring-biased latch is used to block plate movement, then protection against accidental switching is improved, but ease of operation is worsened due to additional locking steps
Solution Approach 1:
The latch mechanism is designed to be dynamic rather than static. The spring-biased latch automatically adjusts its state based on engagement status - permitting movement when disengaged and blocking when engaged. This dynamic behavior allows the system to adapt between easy operation and protected states without requiring complex control logic.
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 secure method to prevent accidental switching from the OFF to the ON position, ensuring operator safety and preventing unintended power activation by physically blocking the plate's movement to the ON position until the lock is released.
Implementation Method 1
A driving member is moveable against the latch to move the latch into the locking position against the bias of a spring
Data Source
AI summary
An apparatus includes a cabinet with a door. A circuit interrupting device is installed in the cabinet. A plate on the door is operative to shift the circuit interrupting device between ON and OFF conditions upon movement of the plate between ON and OFF positions. A handle on the door is linked with the plate to move the plate between the ON and OFF positions upon movement of the handle between corresponding positions. Additionally, a latch is supported the door for movement into and out of a locked position in which the latch blocks movement of the plate to the ON position. A driving member is moveable against the latch to move the latch into the locking position against the bias of a spring. A key moves the driving member against the latch.