Dual-Layer GFCI Button Assembly for Off-Center Force Stability
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Solution Overview
Problem
Conventional electrical outlet buttons, such as those in GFCI outlets, are prone to damage and safety impairment due to eccentric or off-center forces applied by users, leading to torque and potential failure of vital safety functions.
Innovation Solution
A dual-layer button assembly is introduced, comprising an external button and an inner button, where the external button engages the inner button to move longitudinally in a straight path, distributing eccentric forces and using a spring to counteract torque, guided by lead rails for stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single-button design is used, then the device structure is simple, but the button is susceptible to damage from eccentric forces causing torque and component failure
Solution Approach 1:
The button assembly is divided into two separate layers: an outer button accessible by the user and an inner button that directly actuates the reset mechanism. This segmentation allows the outer button to absorb eccentric forces while the inner button remains protected and aligned, preventing torque transmission to internal components.
Solution Approach 2:
The outer button serves as an intermediary element between the user's finger and the inner button. It transmits only the necessary longitudinal force to the inner button while filtering out harmful eccentric forces and torques, protecting the internal mechanism from damage.
2Ease of operation
If the button is positioned for easy access, then the ease of operation is improved, but the button receives eccentric forces that cause torque and potential failure
Solution Approach 1:
By separating the button into outer and inner components, the design allows the outer button to be optimally positioned for user accessibility while the inner button remains centrally aligned with the reset mechanism, receiving only the necessary longitudinal force without eccentricity.
Solution Approach 2:
The outer button acts as a mediator that converts user input into pure longitudinal motion for the inner button, eliminating the transmission of eccentric forces and torques that would otherwise compromise the reliability of the safety function.
3Ease of manufacture
If the button structure is simplified, then the manufacturing is easier, but the button cannot distribute eccentric forces leading to component damage
Solution Approach 1:
The button assembly is segmented into two independently manufacturable components (outer button and inner button) that can be produced using standard manufacturing processes and then assembled, achieving both ease of manufacture and enhanced reliability through the protective layered structure.
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 dual-layer button assembly prevents torque transmission to internal components, maintaining stable movement and prolonging the life of the electrical device while ensuring vital safety functions remain operational.
Implementation Method 1
an outer button assembly that includes an outer button having a top side accessible through a frame of the electrical device and configured to receive an external manual force to push the outer button longitudinally downward into the frame
Implementation Method 2
The dual-layer button assembly is configured to receive an external manual force at the top side of the external button to push the external button longitudinally downward into the frame to initiate the RESETTING operation
Implementation Method 3
guided by lead rails for stable operation
Data Source
AI summary
Disclosed herein are electrical devices having a dual-layer button assembly configured to facilitate a straight path of button movement within the device in response to an external pushing force, including an eccentric or off-center force. A button assembly may include a TEST or RESET button for a ground fault circuit interrupter (GFCI) outlet. In one example, a dual-layer function button assembly may include an external button configured to receive a manual force to push the external button into the outlet and an external spring engaged with the bottom of the external button. An inner button may be arranged within the outlet, behind the external button, that is connected to components that initiate the associated function. The inner button may include an upper side configured to engage the bottom of the external button such that the external button pushes the inner button into the outlet.