| 摘要 |
It comprises a central hollow body (12c) including a central part (10c) of the open chamber connected to a negative pressure source and at least two side hollow bodies (12a, 12b) joined to both sides of central hollow body (12c) by a hinge (13) which admits rotations with respect to a common axis substantially normal to the surface to be treated. The central part (10c) of the open chamber (10c) has an opening (14) at the hinging area (13) and side hollow bodies (12a, 12b) comprise respective side parts (10a, 10b) of the open chamber communicated with the said opening (14) of central part (10c) of the open chamber through the said hinge (13). Thus, the sucking front has a variable geometry and comprises, by means of the said three side and central part (10a, 10b, 10c) of the open chamber the two side and central hinge (13) of the head. <IMAGE> |
