A double stepped screw play elimination unit, which eliminates the side tilts of the sitting unit's frame was applied here.
A new solution in the tilt's blocking system is the application of not only an internal, but also an additional external blocking sleeve.
Bronze gliding rings were applied between the blocking sleeves. Their task is to ease the operating on the screw and at the same time to extend the mechanism's life.
The application of a Ø 15 screw with a pitch of 5 mm makes a fast raising of sitting unit possible.