Patent ID: 6546581
Filing Date: 2003-04-15
Classification: B08B,E21B

Abstract:
A casing scraper for cleaning the inner surface of a tube of a predetermined internal diameter, the scraper comprising:an axis of rotation, a plurality of axially spaced, rigidly connected scraping surfaces with each surface having an angular extent of less than 180Â° and being angularly offset from other surfaces, and shank portions rigidly connecting the scraping surfaces to one another, wherein prior to the insertion of the scraper in the tube, first distances, from the axis of rotation to each scraping surface, are greater than the radius of the internal diameter of the tube to be scraped, second distances from the axis of rotation to a surface diametrically opposite to each scraping surface, are less than the tube radius and the sum of the first distance and the second distance at each scraping surface is less than the internal tube diameter such that the shank portions are required to bend to enable the scraper,to be admitted to the tube internal diameter, and wherein the scraping surfaces are connected by connecting rods which are screwed together with a scraping body mounted at each screwed junction.