M-blade Snap Spring Switch Assembly Simultaneity
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Solution Overview
Problem
Existing multi-pole switches face challenges in achieving precise simultaneity, repeatability, and resistance to shock and vibration due to complexity, size, and limited contact force, especially when dealing with low electrical loads and small differential travels.
Innovation Solution
A switch assembly utilizing an M-blade snap spring with a double-loop end and actuation arm that exhibits snap-action movement to control a plurality of contacts, providing a compact design with enhanced contact force and resistance to shock and vibration by moving between actuator positions to switch positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single multi-pole switch design with a single operating plunger is used, then device complexity is reduced, but manufacturing precision and simultaneity control deteriorate
Solution Approach 1:
The switch assembly is segmented into multiple independent precision snap-action switches (first switch, second switch, etc.), each with its own operating plunger and contact mechanism. This segmentation allows each switch to be independently optimized for precision while maintaining overall system functionality through ganged operation.
Solution Approach 2:
A common actuating mechanism serves as an intermediary that simultaneously actuates multiple independent switches. This mediator transmits the operating force to each switch's plunger through a ganged arrangement, enabling synchronized operation while preserving the precision benefits of individual switch designs.
2Manufacturing precision
If multiple separate precision snap-action switches are ganged together, then manufacturing precision and simultaneity are improved, but device complexity increases
Solution Approach 1:
Multiple precision snap-action switches are merged into a single ganged assembly where they share a common actuating mechanism and housing. This combining approach maintains the manufacturing precision of individual switches while reducing overall device complexity through integrated design and shared components.
3Manufacturing precision
If adjustment features like bendable tabs or adjustment screws are added, then simultaneity control is improved, but ease of manufacture deteriorates
Solution Approach 1:
The ganged actuating mechanism is designed with built-in adjustment features such as bendable tabs that allow field adjustment of simultaneity without requiring complex manufacturing processes. These self-service adjustment features enable precision tuning after assembly, simplifying the manufacturing process while maintaining control over switch simultaneity.
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 achieves precise simultaneity and increased contact force, improving reliability and resistance to shock and vibration, while maintaining low electrical resistance, thus addressing the limitations of existing multi-pole switch technologies.
Implementation Method 1
The actuation arm is configured to selectively move the first and second inner legs between a first inner leg position and a second inner leg position, to thereby cause the M-blade snap spring to move, via snap-action, between a first actuator position and a second actuator position
Data Source
AI summary
A switch assembly includes an M-blade snap spring, an actuation arm, and a switch. The M-blade snap spring exhibits snap-action movement between a first actuator position and a second actuator position. The switch is responsive to the snap-action movement of the M-blade to move between a first switch position and a second switch position. The actuation arm is configured to selectively cause the M-blade snap spring to move, via snap-action, between the first actuator position and the second actuator position, which in turn causes the switch to move between the first switch position and the second switch position, respectively.