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:
Feb. 19, 1985
Filed:
Mar. 12, 1982
William R Garrett, Houston, TX (US);
Smith International, Inc., Newport Beach, CA (US);
Abstract
A drill pipe comprises a tube, a tool joint at each end of the tube, each tool joint having a larger outer diameter than the tube, a fractured sleeve having an internal diameter smaller than the external diameter of the tool joints but slightly larger than the outer diameter of the tube welded together about the tube, and adhesive cement between the sleeve and tube affixing the sleeve to the tube. The sleeve is fractured by forming a plurality of external longitudinal grooves therein not in excess of 180 degrees apart circumferentially, cooling the sleeve to at least the ductile-brittle transition temperature, placing the sleeve on a split tubular internally tapered mandrel, and forcing a wedge into the mandrel with a hammer blow to fracture the sleeve along said grooves into a plurality of segments. The segments are positioned with the fractured surfaces aligned to reform the sleeve about the tube in the desired axial position therealong and the segments are then welded together by filling in the grooves with weld metal.