| 摘要 |
<p>Right and left hand mouldings of polypropylene form a curved brush body, along part of the inner arc of which a suction slot is formed, together with a tubular socket at the open end of the body, when the halves are assembled by means of screws. A brush strip can be fixed in the centre of the suction slot by cams and without additional fastenings. An adapting elbow tube fits in the socket. The brush thoroughly cleans freely aligned pipework, removing the dust completely without pushing it along into heaps as happens with existing nozzles for this purpose.</p> |
