Different And Interesting Ice-Makers
That have been used in home refrigerators over the past 65 years or so.
Yes Servel started it all with crescent shaped ICs with the worlds frist in freezer home ice-maker that produced zero degree ice fully automatically. The crescent shape is the easiest shape to make because it makes for a very durable IM that does not have to have water seals in the mold for a pusher mechanism to eject the cubes, instead the cubs can just be swept out from above with a rotating set of fingers.
Whirlpool bought Servel in the mid 50s and has been producing crescent cube IMs ever since. Once the patents fully expired on the CC IMs around the mid 80s GE made an almost perfect copy of WPs Compact IM that WP had used since around 1964. Since this time almost everyone else has copied this basic CC design. As late as the 70s WP was building the IMs for about 9 out of 12 brands of refrigerators sold in the US.
Automatic IMs that relied on plastic trays that flexed to release ICs are much more troublesome and prone to problems. Several US ref makers found this out the hard way, [ GM Frigidaire , Gibson, Adrimial, Westinghouse, and even WP tried to make a cheaper IM from about 1977-84 [ the Flex-Mold ], all of these designs are long gone because of excessive problems. Today only the Koreans are stupid enough to try selling plastic tray IMs in some LG and Samsung refs, but it not a great loss as these refs are not lasting long enough in many cases for the IM to be the major problem, LOL.
All US refs today use some version of a crescent cube IM in thier refs. Yes the crescent shaped ice cube is not the best shape for round drinking glasses, but you can crush the cubes or buy squared glasses.
There were better IC shapes in the past, All plastic tray IMs made at least partly squared ICs and GE made cylinder shaped ICs in there first IM design [ 1968-1986 ] before GE switched to their WP copy. GEs ICs never had a hole in the middle.
We have quite a collection of unusual early IMs from early refs that came with them here at the warehouse. I even have a 1967 FD bottom freezer model that has a working conveyor belt IM that works, FD called this IM " AIS " for Automatic Ice Service, this IM drops the cubes in a door mounted ice bucket. We also have a bottom freezer GE ref from 1968 that had the GE Snap-Action IM that actually throws the ice forward into the ice bucket for even distribution of the ice.
John L.