Graphon 250 Terminal Keyboard

[Icarium]

I took pictures of another board. This one is from a GraphOn Terminal.

graphon terminal keyboard

DSC01737terminalboard.JPG (384.91 KiB) Viewed 1587 times

Notable features...none.
Well, it is constructed a bit weird, see below.
I also can't find that switch in the vintage switch wiki over on GH. Does anybody know what it is?

Here are more pictures:

After opening the case clean and simple with six screws this is what's inside:

inner part

DSC01739plate.JPG (434.67 KiB) Viewed 1587 times

Very clean. I like it.

inner part (back)

DSC01752back.JPG (398.23 KiB) Viewed 1587 times

Lots of tiny little screws. This is the strange part. The switches are stuck in the front plate as usual but then the back plate is screwed to some of the switches. O_o

Under the back plate is a matrix.

matrix and switches under it

DSC01744matrixandswitchbacks.JPG (470.24 KiB) Viewed 1587 times

The switches have a small spring inside the bottom that presses on the matrix.

switches

DSC01748switches.JPG (256.97 KiB) Viewed 1587 times

and inside the switches is another spring that keeps the slider up.

disassembled switch

DSC01747switchdisass.JPG (167.7 KiB) Viewed 1587 times

Now, what's the name of this switch?

BTW: It's linear and feels neither particularly good nor bad.

[Icarium]

If anybody is interested in the switches, this looks like the same thing: http://www.ebay.de/itm/DIGITAL-Tastatur ... 3a75910366

[HaaTa]

I haven't seen the switches before. But I think I've read a patent with switches that looked similar.