| 摘要 |
Movable device known as a pipe scraper used for servicing small diameter pipes. The field of the invention is the manufacture of measuring apparatuses for a pipe. The apparatuses are virtually self-propelled within said pipe on the pipe scraper which is moved through the pushing action exerted by the product conveyed in said pipe. According to the invention, said pipe scraper is composed of a drive piston (1), itself composed of at least two robust and flexible, annular pulling cup-like elements (3) delimiting an inner sealed surface section and at least a third centering cup-like element (4) arranged between both pulling cup-like elements (3). The supports (10) of said cup-like elements (3, 4) are axially connected in pairs by a traction cable (5) and by a spring (6) surrounding said cable (5), bearing at each of its ends on said supports (10) of two successive cup-like elements and holding said cable (5) tensioned.
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