The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 15, 2003
Filed:
Feb. 22, 2000
George Swietlik, Lowestoft, GB;
Matthew Clubb, Barnet, GB;
Pilot Drilling Control Limited, Lowestoft, GB;
Abstract
A casing scraper for cleaning the internal wall of a tube such as a well casing has at least three, rigidly connected, axially and angularly spaced scraper bodies each with a scraping surface . The radial dimension of the scraper at each scraping surface is slightly greater than the internal radius of the tube which it will scrape. When the scraper is fully inserted in the tube bore, the scraping surfaces are deflected inwardly and the axial connection between the bodies is accordingly elastically deformed. Th energy stored through this elastic deformation produces a radially outwardly acting force which presses the scraping surfaces against the wall of the tube . The eccentric arrangement of the scraping surfaces, and the axial spacing between the surfaces causes the parts of the scraper connecting the scraping surfaces to be placed in bending when the scraper is in place within the tube. The bending of the intermediate parts between the scraping surfaces produces a stress which urges the scraping surfaces into contact with the tube internal surface.