Three-Terminal Dispensing Switch for Appliance Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional dispensing systems in appliances, such as refrigerators, face issues with complexity, cost, and premature malfunction due to direct current switches being susceptible to stackup, tolerance issues, and environmental factors like moisture and corrosion, leading to undesired dispensing of ice cubes and water.
Innovation Solution
A three-terminal dispensing switch with a common, normally open, and normally closed terminal is used, monitored by a controller to verify changes in outputs before actuating the dispensing assembly, reducing complexity and cost while being more robust against moisture and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a direct current dispensing switch is located remotely from the paddle, then the switch is susceptible to stack up and tolerance issues, but this increases the complexity of the device and manufacturing process while also increasing the cost
Solution Approach 1:
The patent combines the common terminal, normally open terminal, and normally closed terminal into a single integrated three-terminal switch assembly located at the dispensing location. This merging eliminates the need for separate remote switches and reduces overall device complexity while maintaining reliability through the unified structure.
Solution Approach 2:
The switch is segmented into three distinct terminals (common, normally open, normally closed) that can be independently monitored by the controller. This segmentation allows for more precise detection of dispensing requests and enables the controller to verify changes in multiple outputs, reducing false activations while keeping the overall device complexity manageable.
2Device complexity
If a direct current dispensing switch is located in close proximity to the dispensing location, then the complexity and cost are reduced, but premature malfunction can be caused due to cut wires, invasive moisture, and corrosion
Solution Approach 1:
The three-terminal switch assembly is enclosed in a protective housing that shields the internal components from moisture and corrosion. This protective enclosure allows the switch to be located at the dispensing position without suffering from environmental damage, maintaining reliability while keeping the device simple and cost-effective.
Solution Approach 2:
The controller monitors the outputs of all three terminals (common, normally open, normally closed) and requires verification of changes in multiple outputs before actuating the dispensing assembly. This feedback mechanism prevents premature malfunction and false dispensing by ensuring that the switch is properly activated and not experiencing internal failures.
3Reliability
If conventional direct current switches are used, then the manufacturing process is complex and costly, but the three-terminal switch with multiple monitored outputs improves dispensing control
Solution Approach 1:
The three-terminal switch serves multiple functions: it provides a common terminal for power connection, a normally open terminal for detecting dispensing requests, and a normally closed terminal for verifying switch activation. This multi-functionality is achieved in a single compact assembly that is relatively simple to manufacture, replacing what would otherwise require multiple separate components and complex wiring.
Solution Approach 2:
The switch assembly is designed to be self-contained with all three terminals integrated into a single unit that can be manufactured as one component. This self-service design eliminates the need for complex assembly processes involving multiple separate switches and extensive wiring, making the system easier to manufacture while providing improved dispensing control through multiple monitored outputs.
Data Source
AI summary
A dispensing switch in an appliance and a method of controlling a dispensing assembly based on a plurality of outputs of the dispensing switch is provided. A dispensing assembly can dispense ice cubes and/or water from the appliance when the dispensing switch is actuated. The dispensing switch can have a plurality of outputs. For instance, the dispensing switch can provide outputs through a common terminal, a normally open terminal, and a normally closed terminal. When the dispensing switch is actuated, a controller can monitor the plurality of terminals to determine whether a change in the outputs has occurred. After the controller determines that a change in the outputs of the dispensing switch has occurred, the controller can control the dispensing assembly based on the outputs of the dispensing switch.