Circuit Interrupter Toggle Mechanism for Low-Force Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing circuit interrupters face difficulties in use due to the forces required to move between ON and OFF positions and challenges in accessing calibration screws located in hard-to-reach areas, leading to inefficiencies and usability issues.
Innovation Solution
The improved circuit interrupter employs a housing with a latch and mechanisms that include a contact arm, separable contacts, a handle, and springs, providing a toggle effect to reduce the effort needed to move between ON, OFF, TRIP, and TRIPFREE positions, with a pin biased by springs to engage and disengage with the latch and handle, facilitating easier operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional circuit interrupter design is used, then the device can perform circuit interruption functions, but high forces are required to move between ON and OFF positions
Solution Approach 1:
The patent implements a dynamic toggle mechanism that utilizes spring bias forces to automatically transition the circuit interrupter between ON and OFF positions. When the handle is moved to initiate a trip, the stored spring energy dynamically propels the mechanism through the transition, eliminating the need for the user to manually overcome strong spring forces. This dynamic approach converts static spring resistance into useful kinetic energy for position changes.
Solution Approach 2:
The toggle mechanism creates a periodic oscillating motion during position transitions. The spring-loaded system naturally oscillates between stable equilibrium positions (ON and OFF), with the trip position serving as an unstable intermediate state. This periodic action allows the mechanism to smoothly transition between positions using stored elastic energy rather than requiring continuous manual force application.
2Ease of operation
If a traditional circuit interrupter design is used, then the device can perform circuit interruption functions, but calibration screws are difficult to access
Solution Approach 1:
The patent relocates the calibration screw from a position requiring disassembly or difficult access to a location on the exterior housing that is easily accessible from the front or side. This dimensional repositioning allows calibration adjustments to be made without manipulating internal components, significantly improving ease of operation while maintaining structural integrity.
3Ease of operation
If a spring-biased toggle mechanism is implemented, then the circuit interrupter can move easily between positions, but the device complexity increases
Solution Approach 1:
The patent integrates multiple functions into unified components. The spring mechanism serves dual purposes: providing the force for easy position transitions and enabling the TRIPFREE function. The pin and slot arrangement combines positioning, latching, and trip indication functions. This merging reduces the number of separate components needed, thereby limiting the increase in overall device complexity despite the enhanced functionality.
Solution Approach 2:
The toggle mechanism is designed to provide multiple functions: normal ON/OFF switching, trip indication, and TRIPFREE operation. The same spring-biased structure and pin-slot-latch arrangement handle all these operations, making the mechanism universal rather than requiring separate systems for each function. This multi-functionality justifies the added complexity by delivering superior operational ease and additional safety features.
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 reduces the effort required to switch positions, enhances usability, and improves reliability by leveraging the bias of springs to toggle between positions without needing to overcome spring bias, thus simplifying the operation and increasing the circuit interrupter's effectiveness.
Implementation Method 1
a first spring that extends between the contact arm and the handle in at least one of the OFF position and the ON position
Implementation Method 2
a second spring that extends between the handle and the pin
Implementation Method 3
the pin being biased by the first spring into the notch in the OFF position and the ON position
Data Source
AI summary
A circuit interrupter movable among ON, OFF, and TRIP positions includes a housing, a latch situated on the housing, a number of mechanisms situated on the housing, each mechanism of the number of mechanisms including a contact arm that is movable with respect to the housing, a set of separable contacts including a stationary contact and further including a movable contact situated on the contact arm, a handle, a pin, a first spring that extends between the contact arm and the handle in at least one of the OFF position and the ON position, a second spring that extends between the handle and the pin, and the pin being movable among a position engaged with the latch in at least one of the ON position and the OFF position and another position engaged with the handle in the TRIP position.