E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/57
E21B 37/02 (2006.01)
Patent
CA 1038751
ABSTRACT OF THE DISCLOSURE The method of attaching a molded plastic scraper to a sucker rod comprising molding said scraper in place around said sucker rod whereby as a consequence of the shrinkage of the fit and swelling of the material a frictional grip of sufficient force to hold the scraper firmly in place under normal operating conditions is obtained with no damage or induction of stress to the sucker rod, said molding comprising forming a rod centralizer about a sucker rod at a selected point along the length of the rod by the process of injection molding and shrink fitting in place said rod centralizer, said rod centralizer being a thermoplastic material having a shrinkage factor of about 0.01 inch-inch per inch whereby upon cooling and solidifying the rod centralizer firmly grips the rod so tightly that a force in excess of 1800 pounds is required to cause said centralizer to move on the rod, the rod centralizer being formed with a central body and radially extending blade means disposed about the central body, said blade means presenting a scraping edge and contact surface for respectively preventing paraffin build-up and bearing the forces encountered in centralizing and scraping and having inwardly sloping surfaces at the top and bottom thereof.
287426
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