| 摘要 |
A cleaning device of the type for removing dirt, scale and extraneous material from the inner wall of a pipeline which comprises a body adapted to be moved longitudinally through the pipeline, a plurality of scraper elements mounted on the body for resiliently engaging the inner wall of the pipeline as the body is moved along the pipeline and at least one cup mounted on the body for sealably engaging the pipeline wall so that the body may be propelled through the pipeline by fluid pressure behind the cup, the improvement which comprises a polyurethane spring mounted between the body and each of the scraping elements for resiliently urging the scraping elements against the inner wall of the pipeline, the polyurethane spring comprising an elongated base member for attachment of the spring to the body, an outer side member disposed in spaced parallel relation with the inner base member and a plurality of cross members extending outwardly and rearwardly from the inner base member to and connecting with the outer side member, the cross members being essentially parallel to each other, the scraping elements being mounted on the outer side member and being resiliently urged against the inner wall of the pipeline by the polyurethane spring, the pressure of the spring against the outer side member being such as to tend to cause the outer side member to move rearwardly and inwardly, while the cross members cant in a rearward direction.
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