Ground Prong Relay Power Switch Mechanism for Electrical Receptacles
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Solution Overview
Problem
Conventional electrical receptacle outlets lack a mechanism to ensure that power is not supplied unless the ground prong is fully inserted, posing safety hazards due to the risk of partially dislodged plugs and accidental insertion of objects into live slots, which can lead to electrical shocks or injuries.
Innovation Solution
A ground prong relay or power switch mechanism that breaks the flow of current to the outlet unless the ground pin is substantially completely inserted, featuring a tab that only activates the switch when the ground prong is fully inserted, and an adapter plug to ensure three-pronged connections for safety outlets, preventing power flow unless a three-pronged plug is inserted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power is supplied as soon as prongs are inserted part-way into the outlet slots, then power is almost instantaneously available to the appliance, but the exposed plug prongs become live and create electrical hazards
Solution Approach 1:
The ground prong must be inserted first to activate the power switch before the hot and neutral prongs can establish electrical contact. This preliminary action ensures the appliance is grounded before power is supplied, eliminating the hazard of exposed live prongs while maintaining instantaneous power availability once the sequence is completed.
Solution Approach 2:
The power switch remains in the off position as a preliminary protective measure, preventing power from being supplied until the ground prong is inserted. This preliminary anti-action counteracts the potential harmful effect of exposed live prongs by ensuring the circuit is de-energized until proper grounding is established.
2Reliability
If a ground prong receiving slot is provided in the outlet, then grounding safety is improved, but the outlet can be activated by inserting only two prongs leaving the ground slot empty
Solution Approach 1:
The ground prong insertion is required as a preliminary action to activate the power switch. The switch mechanism is designed so that inserting only the hot and neutral prongs without the ground prong will not activate the outlet, ensuring grounding safety is maintained while preventing unauthorized or unsafe activation.
Solution Approach 2:
The power switch acts as an intermediary mechanism between the prong insertion and circuit activation. It mediates the activation process by requiring ground prong insertion as a condition for enabling power flow, thus reconciling the need for grounding safety with outlet activation control.
3Object-affected harmful factors
If tamper resistant receptacles with spring-loaded cover plates are used, then insertion of small objects is prevented, but the safety feature can be overcome by inserting two objects simultaneously
Solution Approach 1:
The ground prong insertion serves as a preliminary action that must occur before the circuit can be activated. Even if tamper resistant features are bypassed, the power switch remains inactive until the ground prong is inserted, providing an additional layer of safety that cannot be easily overcome by simultaneous insertion of multiple objects.
Solution Approach 2:
The power switch remains in the off position as a preliminary protective measure, preventing power supply even if the tamper resistant receptacle is bypassed. This creates a secondary safety barrier that counteracts the potential harm from objects inserted into the slots.
Data Source
AI summary
A ground prong power switch for an electrical receptacle having an open switch position in which current is prevented from flowing to a receptacle outlet and a closed switch position in which current can flow to the outlet, which switch is activated by the insertion or removal of a ground prong of a plug into pin receiving slot of the outlet. A phase conductor is connected directly to a first switch mechanism, and a separate conductor is connected between the switch mechanism and the hot terminal of the receptacle. In a first open switch position a pair of contacts is electrically disconnected and in a second closed switch position the contacts are touching and an electrical current is reinstated to the hot terminal of the receptacle. A tab portion extends into the distal end of the ground prong receiving slot such that upon a ground prong being inserted into the ground prong receiving slot, the tab is contacted and is depressed outwardly causing the switch mechanism to move to the second closed switch position. The tab portion is tapered towards its end, so that items other than a ground prong inserted in the slot will likely deflect to the side of the tab and not activate the switch and close the circuit. Also provided is an electrical adapter plug device configured to enable a two-pronged power cord plug to be used with and energize the safety outlet or receptacle device including a female socket portion configured for receiving the two-prong plug and a three-prong plug portion including an activator pin configured to be received in a grounding pin slot of a socket and further including a mechanism for preventing the two-prong plug from being easily disengaged from the adapter.