| 摘要 |
Such devices usually have a suction opening on the underside of a suction head, which is surrounded by a ring shaped tightening material. Due to the unevenness of the upper side of the sack difficulties can arise when placing the tightening material against the sack.According to the invention, the upper part of the tightening material (6) is placed in a ring shaped track (5) between two ring shaped chambers (7, 8) jutting downward from the suction head with lower, rounded off edges, to which the rounded off edges or the outer chamber (8) preferably jut of farther from the suction head (2) than the rounded off edges of the inner chamber (7). The purpose of the chambers (7, 8) is to produce a ring shaped, even impression in the sack that makes tightening the material against the sack easier.<IMAGE> |
