| 摘要 |
PURPOSE:To improve the smoothness, accuracy and the reliability of operation by widening a deflecting/guiding rail through a screw bolt while adjusting the length of elevating rod through an expandable/contractable rod. CONSTITUTION:A pair of screw bolts 19, 19' are arranged vertically at the inside of lateral rods 16, 16' at the opposite sides of bucket function member 10 to rotate the bolts 19, 19' in same direction with same speed through a chain and a sprocket by means of a motor arranged on the upper face of said member 10. The gap between deflecting/guiding rails 26, 26' having nuts to be screwed over said bolts 19, 19' is made variable then a pair of shrinkable shafts 32, 32' are inserted idly and slidably through a pass hole in base metal from the opposite ends into the inner tube 29 of elevating lateral rod 31. Then grooved pulleys 33, 33' at the outer end section of the shafts 32, 32' are fitted over the ridged edges of the rails 26, 26' and shrinkable rods are arranged between the upper ends and between the lower ends of a pair of foldable bands to contain the holder 53 in respective shelf step 6 through fitting of idle moving wheels 52, 52' and containing rails 4, 4'. |
