Two step type sky parking devices

摘要

PURPOSE: To securely prevent a pallet in motion from falling. ;CONSTITUTION: A pallet 10 loading a car is supported to be vertically movable by feed screw shafts 21, 21,v of posts 20, 20,... A pair of upper and lower nuts keeping a certain assembling distance are assembled in the screw unit 22 fitted to the feed screw shaft 21. The pallet 10 is supported only by the upper nut. The lower nut is moved up and down in accordance with the upper nut to back up the upper nut.;COPYRIGHT: (C)1994,JPO