Switch Contact Closing Mechanism with Trip Blade Release
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Solution Overview
Problem
Existing electrical switch designs face complexity and dimensional challenges, requiring simplified mechanisms for economical production and easy assembly while maintaining performance and safety, particularly in ensuring rapid contact closure independent of handle speed to prevent electric arcs.
Innovation Solution
A contact closing device with a mechanism featuring a contact holder lever, oscillating movable contacts, springs, and trip blades, where the trip lever temporarily locks and releases the contacts, allowing a spring to drive instantaneous closure, independent of handle speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If complex rapid-closure mechanisms are used to ensure instantaneous contact closure, then contact closure speed is improved, but device complexity increases
Solution Approach 1:
The mechanism is divided into independent functional components: the contact holder lever for supporting contacts, the trip blade for blocking motion, the spring for storing energy, and the trip lever for actuation. Each component performs a specific function, allowing the system to achieve rapid closure through coordinated action of simple parts rather than a complex integrated mechanism.
Solution Approach 2:
The spring is pre-compressed during the handling operation to store potential energy before contact closure is needed. This preliminary action allows the contacts to close instantaneously when released by the trip blade disengaging from the trip lever, without requiring complex active control during the actual closure moment.
2Device complexity
If simplified mechanisms are used to reduce device complexity, then ease of manufacture is improved, but contact closure speed may deteriorate
Solution Approach 1:
The mechanism uses dynamic elements including the oscillating contact holder lever and the spring-loaded system that transitions from a blocked state to a rapid motion state. The trip blade and trip lever create a dynamic release mechanism that converts the pre-compressed spring energy into instantaneous contact closure, maintaining high speed with simple components.
3Reliability
If rapid contact closure is ensured to prevent electric arcs, then safety is improved, but device dimensions may increase
Solution Approach 1:
The trip blade is fitted inside the seat of the contact holder lever, and the spring is positioned within the same seat structure. The trip lever operates within the existing mechanism space. This nested arrangement allows all components to occupy minimal space while still providing the rapid closure function needed for safety.
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 solution provides a structurally simple, economically producible, and reliable contact closure mechanism that ensures safety and performance, maintaining small dimensions and adhering to standards, with high reliability and durability.
Implementation Method 1
said spring undergoing a compression; at the end of said portion of rotational motion, said trip blade disengages from said trip lever, thus leaving said movable contact free to contact said fixed contact by the action of said spring
Data Source
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AI summary
A contact closing device for a switch having at least one movable contact, at least one fixed contact, and a contact mechanism actuated by an operating handle; a contact holder lever supports one or more movable contacts; the contact holder lever has a rotational motion between an open contact position and a closed contact position; each movable contact has an oscillating motion within a respective seat formed in the contact holder lever; a tripping lever is associated with the contact holder lever and is adapted to actuate the oscillating motion of each movable contact; each movable contact is fitted in the respective seat together with a respective spring and a respective tripping blade; each tripping blade is engaged by the tripping lever during a portion of the rotational motion from the open contact position to the closed contact position; during this portion of rotational motion the tripping blade blocks at least partially the movement of the movable contact and the spring undergoes a compression; at the end of the portion of rotational motion the tripping blade disengages from the tripping lever, leaving the movable contact free to contact the fixed contact by virtue of the action of the spring. The trip blade is fitted inside the seat of the contact holder lever and is provided with an end adapted to be engaged by the trip lever fitted on said contact holder lever.