GFCI Locking Mechanism Prevents Faulty Reset
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Solution Overview
Problem
Ground fault circuit interrupter (GFCI) devices can faultily reset due to vibrations or accidental movements during loading and transportation, leading to potential electric shocks, fires, and personal injury, as the movable assembly may inadvertently move from a tripped position back to a reset position.
Innovation Solution
A locking mechanism is introduced, comprising a blocking member, a resilient member, and a locking member, which prevents the movable assembly from moving back to the reset position unless a sufficient force is applied, ensuring the assembly remains in the tripped position until a manual reset is performed. This mechanism includes an electromagnetic tripping component and a resetting component with different electromagnetic forces to manage the movement of the movable assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is added to prevent faulty resetting, then reliability is improved, but device complexity increases
Solution Approach 1:
The locking mechanism is merged with the existing tripping mechanism by integrating the locking member and resilient member into the same assembly structure. The blocking member is positioned to work in conjunction with the movable assembly's existing components, creating a unified structure that provides both tripping and locking functions without requiring completely separate systems.
Solution Approach 2:
The resilient member automatically engages and disengages the locking member based on the position and movement of the movable assembly. When the assembly moves in the tripping direction, the resilient member naturally releases the lock; when the assembly is in the tripped position, the resilient member automatically engages the lock, eliminating the need for additional control mechanisms or external intervention.
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 locking mechanism effectively prevents unintended resetting of the GFCI, ensuring the device remains in a tripped state until a proper reset operation is conducted, thereby reducing the risk of electric shocks and injuries.
Implementation Method 1
a resilient member configured to have an expanding force along a third direction perpendicular to the first direction
Implementation Method 2
an electromagnetic tripping component configured such that when energized, the electromagnetic tripping component generates a first electromagnetic force that causes the movable assembly to be in the first position
Implementation Method 3
an electromagnetic resetting component configured such that when energized, the electromagnetic resetting component generates a second electromagnetic force that causes the movable assembly to be in the second position
Data Source
AI summary
A locking mechanism for protecting a ground fault circuit interrupter (GFCI) from being faultily reset. In one embodiment, the locking mechanism has a blocking member secured onto a lateral side of the movable assembly, a resilient member, and a locking member having a first end portion positioned against the resilient member, a second end portion positioned in relation to the blocking member, and a body portion defined between the first end portion and the second end portion. When the movable assembly is in a first (tripping) position, the expanding force of the resilient member applied to the first end portion of the locking member causes the second end portion of the locking member to be positioned against the blocking member so that no movement of the movable assembly from the first position to a second (resetting) position is allowed.