The Anti-Disengagement Bushing is a safety device preventing the translating trapezoidal screw from disengaging from the Screw Jack in the event of an accidental overstroke. The AntiDisengagement Bushing features a trapezoidal thread which guarantees the full load support during the attempted overstroke.
The stop prevents the acme screw thread unscrewing clear of the screw jack housing. It is a washer pinned at the acme screw end(opposite the attachment side ）that blocks the screw translation when reaching the relative stop.
The acme screw length is defined to allow, under normal use, at the maximum extended position, 20mm of additional stroke(safety extra-stroke). If the mechanical stop reaches accidentally the relative stop, it is necessary to check the screw jacks components to verify possible damages.
