Unknown lead nut?

[slavkok]

Hello...
Searching the web I find some Hungarian leadscrew nut design unknown to me.
The page is:
http://www.hobbycnc.hu/CNC/Mech8/Mechanika8.htm

Does somebody know more on that design? (seems to be some kond of antibacklash nut)

Thanks

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[ger21]

http://www.cnczone.com/forums/showthread.php?t=13593

[slavkok]

thanks...