Trapped-Key Locking Mechanism for Docking Station Safety
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Solution Overview
Problem
Connecting a temporary power source to an electrical load can be complex and dangerous, particularly during power outages, as existing docking stations do not adequately prevent simultaneous electrical communication between the power source and the utility, posing risks to utility workers and the generator.
Innovation Solution
A docking station with a cabinet and a trapped-key locking mechanism that prevents electrical cables from being connected to the interior when the building's electrical system is in communication with the utility, ensuring safe switching between the generator and the utility power supply by locking both doors when the system is active.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a docking station allows connection of temporary power source to building electrical system, then ease of operation is improved, but safety deteriorates due to risk of simultaneous electrical communication with both generator and utility
Solution Approach 1:
The trapped-key mechanism performs preliminary action by requiring the utility disconnect switch to be opened and the key removed before the generator can be connected. This preliminary disconnection of the utility power source eliminates the risk of simultaneous electrical communication, ensuring safety while maintaining ease of operation through a standardized procedure.
Solution Approach 2:
The trapped-key mechanism acts as an intermediary between the utility disconnect switch and the generator connection process. The key physically transfers control from the utility side to the generator side, mediating the transition and preventing direct simultaneous connection of both power sources to the electrical system.
2Reliability
If a locking mechanism is added to prevent simultaneous connection, then safety is improved, but device complexity increases
Solution Approach 1:
The trapped-key mechanism merges multiple safety functions into a single integrated component. The same key that disconnects the utility power source also enables generator connection, combining what could be separate locking mechanisms into one unified system that reduces overall complexity while maintaining comprehensive safety.
Solution Approach 2:
The trapped-key mechanism serves multiple functions: it acts as a disconnect switch for the utility power source, a locking mechanism for the generator connection, and a procedural guide for operators. This multi-functionality eliminates the need for separate specialized components, reducing device complexity while ensuring safety.
3Ease of operation
If the utility disconnect switch can be opened independently, then ease of operation is improved, but harmful factors increase due to risk of back-feeding to utility lines
Solution Approach 1:
The trapped-key mechanism requires the utility disconnect switch to be opened and the key removed as a preliminary action before generator connection is permitted. This preliminary disconnection prevents the generator from being connected while the utility is still active, eliminating the back-feeding hazard while maintaining operational ease through a clear sequential procedure.
Solution Approach 2:
The trapped-key mechanism converts the potential harm of independent switch operation into a benefit by using the act of opening the utility disconnect switch as the trigger that enables generator connection. The same action that could potentially cause back-feeding if done incorrectly becomes the safety mechanism that prevents it, as the key removal signals safe conditions for generator connection.
Data Source
AI summary
Embodiments of the present invention provide a docking station that prevents electrical cables (e.g., from a portable power generator or other temporary power source) from even being connected to connectors in the interior of the docking station while the building's electrical system (or other electrical load) is in electrical communication with the utility. The docking station can include a cabinet with two doors that swing in different directions and a locking mechanism that regulates the opening and closing of those doors. In preferred embodiments, the locking mechanism includes a trapped-key lock. Embodiments of the present invention can be used in applications other than docking stations.