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:
Jul. 11, 1978
Filed:
Apr. 04, 1977
James H Cobbs, Tulsa, OK (US);
Other;
Abstract
A tool joint for drill pipe which is particularly well adapted for large diameter drill pipe, comprises a pin section and a box section. Each section of the tool joint is adapted at a first end to be attached to the drill pipe by welding, or threads, as is conventionally done. The principal part of the tool joint is of larger diameter than the pipe and includes a plurality of longitudinal, circumferentially-spaced tongues and grooves in the form of a jaw clutch. The tongues in the pin section match the grooves in the box section and vice versa. Means are provided to polarize the tongues and grooves so that they fit together in only one angular position. A tubular extension on the second end of the pin section is adapted to fit into a bored opening or socket in the second end of the box section. O rings or other means, are provided to seal the tubular extension into the bored opening. The outer circumferential surface of the enlarged portions of the tool joint sections are threaded with a selected, uniform diameter, thread. A threaded collar is screwed over the full threaded section. This locks the two tool joint sections in tension, while the tongues and grooves provide full torque transmitting capacity of the drill pipe.