Leaf Spring Contactor for Self-Cleaning Electrical Switches
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Solution Overview
Problem
Existing electrical switches face challenges in precisely adjusting switching behavior and maintaining reliable operation over time due to complex structures and precise manufacturing requirements, especially when operating under unfavorable conditions with potential for contact surface contamination.
Innovation Solution
An elastically deformable leaf spring contactor with projecting contact fingers that can slide over selective contact bodies, providing self-cleaning and redundancy, and allowing for adjustable movement ratios and optional reinforcement with a compression spring for enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sliding contactor with multiple components is used to achieve reliable switching, then switching reliability is improved, but device complexity increases and manufacturing precision requirements become extremely high
Solution Approach 1:
The patent combines multiple functions into a single contactor body: the elastic element, the contact fingers, and the restoring spring are integrated into one piece rather than being separate components. This reduces the number of parts while maintaining reliable switching through the inherent elasticity of the contactor material
Solution Approach 2:
The contactor serves multiple functions simultaneously: it acts as the moving contact, provides restoring force through its elasticity, maintains contact pressure, and enables self-cleaning of contact surfaces. This multi-functionality reduces overall device complexity while improving reliability
2Manufacturing precision
If contact surfaces are kept separate and precise positioning is used to prevent intermediate positions, then switching precision is improved, but manufacturing complexity and assembly difficulty increase
Solution Approach 1:
The patent changes the physical state of the contactor to elastomeric material, which allows for flexible positioning and tolerance compensation. The elastic deformation capability enables the contactor to adapt to manufacturing variations while maintaining precise switching positions without complex assembly requirements
Solution Approach 2:
The contactor utilizes elastic deformation dynamics to achieve precise switching. The material's ability to deform and recover provides natural positioning feedback, eliminating the need for rigid precision machining and complex assembly mechanisms
3Stability of the object's composition
If a rigid contactor structure is used for stable switching, then structural stability is improved, but adaptability to different switching positions and self-cleaning capability deteriorate
Solution Approach 1:
The patent changes the material parameter from rigid to elastomeric, which provides both structural stability through the material's inherent strength and adaptability through its elastic deformation capability. This enables the contactor to maintain stable switching while adapting to different positions and self-cleaning contact surfaces
4Reliability
If multiple components are used to achieve reliable electrical connection, then electrical connection reliability is improved, but the number of parts and assembly steps increase
Solution Approach 1:
The patent merges the electrical contact function, mechanical restoring force, and contact pressure maintenance into a single elastomeric contactor. This eliminates the need for multiple separate components and complex assembly steps while ensuring reliable electrical connection through the material's inherent properties
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
Enables precise adjustment of switching behavior, self-cleaning of contact surfaces, and reliable operation over extended periods with a simpler structure and assembly process, even under adverse conditions.
Implementation Method 1
An elastically deformable contactor in the basic form of a leaf spring is provided
Implementation Method 2
The contactor is provided with contact fingers that project from the plane of the leaf spring and that can slidingly cover contact surfaces
Data Source
AI summary
An electrical switch has a common contact body and a first selective contact body and a second selective contact body. A contactor is connected mechanically and in an electrically conducting manner to the common contact body. The contactor comprises an elastic, electrically conducting material. It is formed originating from the basic form of a leaf spring into a multifunctional part having a clamping area, a deformation area and a stiffened actuating area. The pre-tension of the contactor causes the contact fingers to be positioned against the contact surfaces of the first selective contact body. Pressure on the actuating area elastically deforms the contactor, and the actuating area pivots with the contact fingers so that the contact fingers switchingly enclose the contact surfaces of the second selective contact body.