| 摘要 |
<p>A tube cleaner (1) for removing thin hard deposits form the inner surface of a tube (12) has a shaft (2) with a nose portion (3) and tail portion (4), and two or three scraper elements (6, 6', 6'') along the shaft (2). Each scraper element is a one piece element having a base portion (7) and a plurality of outwardly biased rearwardly extending fingers (8) terminating as blade portions (9). Adjacent fingers (8) are of different lengths and the blade portions (9) make substantially point-to-point contact with the tube inner wall surface (14) as the scraper element (6, 6', 6'') is forced through the tube (12). <MATH></p> |
