Redundant Dome Switch Array in Continuous Cover Control Module
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Solution Overview
Problem
Control modules used in material handling vehicles face challenges in mechanical and electrical robustness due to varying environmental demands, necessitating a more robust solution with a continuous cover and redundant switches that can reliably trigger specific functions.
Innovation Solution
A control module design featuring a housing with a continuous cover and an array of dome switches integrated with a control board, where movement of the continuous cover relative to the housing triggers specific functions by actuating multiple switches simultaneously, providing redundancy and enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple switches are positioned within the housing in selective mechanical engagement with the continuous cover, then reliability is improved through redundant switching capability, but device complexity increases due to the array of switches and their integration with the control board
Solution Approach 1:
The control module divides the switching function into multiple independent dome switches arranged in an array, where each switch can independently trigger a particular function. This segmentation provides redundancy while maintaining manageable complexity through modular organization of the switches and their associated contacts on the control board.
Solution Approach 2:
The invention changes the parameter of switching redundancy by configuring multiple dome switches to respond to a single continuous cover actuation. Each switch is electrically configured to independently trigger the same function, transforming a single-point failure system into a multi-point reliable system without requiring multiple separate control mechanisms.
2Duration of action of stationary object
If a continuous cover is used with redundant switches, then durability is enhanced under demanding environmental conditions, but manufacturing complexity increases due to the array of dome switches and their integration requirements
Solution Approach 1:
The continuous cover merges multiple actuation points into a single integrated component that simultaneously engages multiple dome switches. This combining approach enhances durability by providing redundant actuation paths while simplifying manufacturing compared to creating multiple separate switch mechanisms, as the continuous cover can be molded as a single piece with integrated actuation elements.
Solution Approach 2:
The continuous cover serves multiple functions: it provides structural protection, defines the actuation interface, and simultaneously engages multiple dome switches through its design. This multi-functionality reduces the number of separate components needed, easing manufacturing while enhancing durability through redundant switching capability.
3Reliability
If multiple dome switches are integrated with the control board, then functionality is maintained under varying environmental demands, but the number of components increases
Solution Approach 1:
The dome switches are nested within the housing and integrated with the control board in a compact array configuration. Each switch is positioned to be actuated by the continuous cover while maintaining close integration with the control board, reducing the overall space required and minimizing the number of discrete components needed compared to distributed switch arrangements.
Data Source
AI summary
A control module includes a housing, a continuous cover supported by the housing, and a plurality of switches positioned within the housing in selective mechanical engagement with the continuous cover. Each of the plurality of switches is electrically configured to be capable of independently triggering a particular function when the continuous cover is moved relative to the housing.