Abstract: A scraper for pipe is provided with scraper blades having arcuate scraper surfaces projecting therefrom with the blades movable radially between a contracted and expanded position which provides a first minimum diameter of the scraper surfaces in contracted position and a second maximum diameter when in expanded position which extends at least to the maximum internal pipe diameter, and an adjustment arrangement which enables said arcuate scraper blades to be adjusted radially to maintain said first and second diameters as the scraper surfaces wear.

Abstract: A casing scraper includes an elongated hollow mandrel with upper and lower longitudinally, circumferentially extending receptacles. Scraper blade means formed by a plurality of longitudinally and circumferentially extending scraper blades are provided in each receptacle with resilient means tending to urge each of the scraper blades radially outward from the mandrel. The upper receptacles are circumferentially offset relative to the lower receptacles so that the scraper blade means in the upper receptacles overlap the scraper blade means in the lower receptacles. Hold down rings are provided adjacent the upper end of the upper receptacles and the lower end of the lower receptacles for retaining the scraper blade means in the receptacles and the hold down rings are provided with a cutting metal surface adjacent an end of each ring. A ring fits about the mandrel between the upper and lower receptacles to further aid in retaining the spring loaded blades in position on the casing scraper.