Switch Interlock Device Break-Before-Make Mechanism
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Solution Overview
Problem
Conventional manual transfer switch interlock devices fail to effectively prevent both utility and generator power sources from simultaneously supplying power to load circuits, risking overloading and damage, and lack secure mounting to prevent accidental dislodgment and electrocution.
Innovation Solution
A switch interlock device comprising a bracket and interlock tripping mechanism that restricts horizontally adjacent switches from being in the ON position simultaneously, physically linking them to function as 'break-before-make' switches and securely mounting them to the switch panel, preventing simultaneous power supply and ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional interlock devices are used to prevent simultaneous power supply, then safety against overloading is improved, but the devices fail to reliably prevent both switches from being in ON position simultaneously
Solution Approach 1:
The patent introduces an intermediary mechanical linkage system consisting of a trip member and cam mechanism that mediates between the two switches. When one switch is turned ON, the trip member physically interacts with the cam to force the other switch OFF, ensuring that both switches cannot be simultaneously ON. This intermediary mechanism reliably prevents simultaneous power supply and eliminates the risk of overloading and circuit damage.
2Reliability
If interlock devices physically link switches to enforce break-before-make operation, then simultaneous power supply is prevented, but the devices lack secure mounting and can be accidentally dislodged
Solution Approach 1:
The patent merges the interlock function with the mounting function into a single integrated device. The bracket that secures the interlock mechanism to the switch panel also serves as the mounting structure for the trip member and cam mechanism. This unified design ensures that the interlock device cannot be accidentally dislodged while maintaining reliable break-before-make switching operation.
3Device complexity
If simple interlock devices are used that only block simultaneous ON position, then device complexity is reduced, but they fail to actively switch one switch OFF when the other is turned ON
Solution Approach 1:
The patent employs a dynamic cam mechanism that automatically responds to the position of one switch to control the other switch. The cam profile is designed such that when one switch is turned ON, the trip member follows the cam surface and automatically forces the other switch OFF. This dynamic interaction provides automatic switch control without requiring complex electronic circuits or additional actuators, maintaining simplicity while achieving ease of operation.
Data Source
AI summary
A switch interlock device for controlling certain switching operations within a switch panel, the switch interlock device including a bracket and an interlock tripping mechanism. The bracket being configured to be coupled to a housing of the switch panel and comprising a face member coupled with a spanning member extending a depth of the housing, the spanning member operably coupled to a back wall of the housing. The interlock tripping mechanism coupled to the face member of the bracket and positioned between a pair of horizontally adjacent switches housed within the housing of the switch panel, the interlock tripping mechanism configured to: restrict the pair of horizontally adjacent switches from both being in an ON position at the same time; and switch one of the pair of horizontally adjacent switches to an OFF position when the other of the pair of horizontally adjacent switches is switched to the ON position.