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:
Mar. 29, 1994
Filed:
Feb. 25, 1993
Clyde A Willis, Wichita Falls, TX (US);
Clyde D Durrett, Lexington, KY (US);
W-N Apache Corporation, Wichita Falls, TX (US);
Abstract
An apparatus for gripping a down hole tubular for support and rotation, or a string of such tubulars, includes a body element adapted to be rotated at high torques either by a top head drive or a rotary table of an earth drilling machine. Gripping elements are mounted in a central cavity of the body element, and each gripping element includes a lower gripping portion shaped to engage a tapered shoulder of a length of drill pipe to support the drill pipe and an upper gripping portion shaped to engage the tool joint of the drill pipe to rotate the drill pipe. First guides are secured between the body element and the lower gripping portions in the central cavity, and these first guides are oriented to approach one another toward a lower portion of the body element. Second guides are secured between the upper and lower gripping portions, and these second guides are oriented to approach one another at an acute angle with respect to the axis. Links are secured to the gripping elements such that initial downward movement of the links forces the lower gripping portions radially inwardly along the first guides and further downward movement of the links after the lower gripping portions have seated against the down hole tubular forces the upper gripping portions radially inwardly along the second guides. The disclosed apparatus serves as a combination elevator, make-up/break-out tong or wrench set, spinner, and drill string rotation mechanism. It is fully compatible with remote control and automation.