One of my buddies (yeah, you know who) has a cool fridge (ha, ha) that has a built-in ice cube distributor. I could not take it apart to observe the inner workings of the device, so how does the thing work ?
Btw, no relation to NWA whatsoever
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Either there is a water cable connected to it or there is a containter inside that you fill up. Then it is freezed (what a surprise!) inside the door, and when you push the button to get ice, you will get ice!
The ice maker signals a watervalve to permit water to flow into the tray.
When the water tray thermostat senses that the tray has reached a certain temperature, it signals the ice maker to begin ejecting the cubes.
....Adding to ProSimTec, after the cubes are in the "holding tray" and you press the button to get ice, a large corkscrew device like a wine bottle opener (Only bigger) carries the ice to the chute where it is either crushed if you want to sent directly out to a cup or whatever drinking apparatus you have. At least that's how they are in the USA.