DADoES:
" Whirlpool also had a tray-type ice maker, called the Flex-Tray. The tray turned over, a corner of it caught on a nub on the frame and flexed the tray to release the cubes."
This sounds like the ice maker I had on a 1980s Crosley. I don't know who made the refrigerator, except that Wards reefers were the same with a few trim differences. Anyhoo, that icemaker mechanism was more than a bit trouble-prone. If the tray didn't flex right, or if cubes stuck, then the next time the mechanism tried to fill the tray with water, there was a problem. Water poured all over the cubes still in the tray, then spilled over into the icemaker cube bin. BIG mess.
When that reefer died, I bought a Roper on sale, with the standard Whirly icemaker, and never felt so relieved as I did when my icemaker troubles were at an end. I didn't and don't like those crescent-shaped "cubes", but at least the thing works without Divine Intervention being needed.