Patent ID: 7794193

Claim:
A three-side stacker comprising a side push frame at one end of the stacker, on which a side arm is horizontally traversable mounted, wherein the side arm has a first traversable portion mounted on the side push frame and a second portion, which is mounted pivotally around a vertical axis on the first portion and on which a load supporting means is mounted, which is actuable by a hydraulic driving means having a hydraulic lifting cylinder, and a pivoting equipment for the second portion, mounted on the first portion, the driving means being attached to a lifting mast for the load supporting means, further comprising a casing ( 100 ) for the hydraulic drive means ( 66 ) having a rotary spindle ( 101 ) attached to the first portion, a portion of the spindle ( 101 ) outside of casing ( 100 ) being attached to the lifting mast ( 70 ), which portion supporting the lifting mast, and in that further the hydraulic drive means ( 66 ) is defined as a rotary feedthrough for a conduit for hydraulic medium for the lifting cylinder ( 72 ) at the second portion, a passage ( 140 ) of spindle ( 101 ) being connected with a stationary terminal for hydraulic medium in each position of the spindle and the axial passage ( 140 ) being connected to lifting cylinder ( 72 ).