Mechanical Interlock Latch Assembly for Safe Plug Insertion
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Solution Overview
Problem
Mechanical interlocks face challenges in providing a robust locking mechanism and facilitating easier assembly, especially in harsh environments, while also ensuring proper power management and fault indication in electrical devices.
Innovation Solution
The mechanical interlock incorporates an interlock latch that prevents rotation of the handle assembly until a plug is properly inserted, a slider plate and latch spring to prevent plug removal in the ON position, and an integrated magnetic switch with a sensor for position monitoring and fault indication, along with a battery backup for continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional locking mechanism is used in mechanical interlocks, then the device can prevent making and breaking of power under load, but the locking mechanism lacks robustness and is difficult to assemble in harsh environments
Solution Approach 1:
The locking mechanism is divided into separate functional components: an interlock latch for preventing handle rotation, a slider plate for controlling plug removal, and a latch spring for providing locking force. This segmentation allows each component to be optimized independently and assembled more easily in harsh environments.
Solution Approach 2:
The interlock latch is positioned to engage with the handle assembly before the plug is fully inserted, preventing premature rotation. The slider plate is pre-configured to control plug removal based on handle position, ensuring safe operation sequence is enforced before power connection is complete.
2Reliability
If an interlock latch is added to prevent handle rotation until plug insertion, then the locking mechanism robustness is enhanced, but the device complexity increases
Solution Approach 1:
The interlock latch is integrated with the existing handle assembly and shaft structure. The latch spring combines both the locking force provision and the latch operation in a single component. The slider plate merges the plug retention function with the handle position control, reducing the need for separate mechanisms.
Solution Approach 2:
The interlock latch serves multiple functions: preventing handle rotation before plug insertion, enabling handle rotation after plug insertion, and working in conjunction with the slider plate to control plug removal. The slider plate simultaneously retains the plug and controls the interlock latch operation based on handle position.
3Reliability
If a slider plate and latch spring are added to prevent plug removal in ON position, then the safety is improved, but the assembly process becomes more complex
Solution Approach 1:
The slider plate is designed to move dynamically between positions based on handle assembly rotation. In the OFF position, the slider plate allows plug insertion. When the handle is rotated to the ON position, the slider plate moves to engage with the plug and prevent removal. The latch spring dynamically adjusts to provide continuous locking force throughout the operation cycle.
Solution Approach 2:
The latch spring automatically engages and disengages the interlock latch based on the position of the slider plate and handle assembly. The spring provides continuous force to maintain the locked state without requiring external actuation. The slider plate self-actuates based on handle rotation, moving to the appropriate position to either allow or prevent plug removal.
4Reliability
If an integrated magnetic switch with sensor is incorporated for position monitoring, then the fault indication capability is improved, but the device complexity and cost increase
Solution Approach 1:
The magnetic switch and sensor system replaces traditional mechanical position indicators or switches. The magnetic field interaction provides non-contact sensing of the handle assembly position, eliminating the need for mechanical linkages, contacts, or wear-prone components. This provides more reliable fault indication without the complexity of mechanical position detection systems.
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 design enhances the robustness of the locking mechanism, simplifies assembly, ensures accurate power management, and provides reliable fault indication, even in harsh environments, by ensuring the handle assembly can only be rotated to the ON position after proper plug insertion and maintaining power supply integrity.
Implementation Method 1
an integrated magnetic switch with a sensor for position monitoring and fault indication
Data Source
AI summary
An improved mechanical interlock including one or more features to facilitate a more robust design, easier assembly, and/or enhanced capabilities. For example, the mechanical interlock may include an interlock latch operatively associated with an external handle assembly and an internal connector. The interlock latch being directly coupled to a shaft coupled to the handle assembly, thus providing an improved and more robust latching mechanism. The mechanical interlock may also include one or more keys (e.g., a Poke-Yoke feature) to facilitate easier assembly and/or to prevent human errors caused by improper assembly. The mechanical interlock may also include an integrated magnetic switch and monitoring system to ensure that accurate location of the handle assembly is known.