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. 22, 1988
Filed:
Mar. 09, 1987
Applicant:
Inventor:
Michael C Dinsdale, Dallas, TX (US);
Assignee:
National-Oilwell, Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B25B / ;
U.S. Cl.
CPC ...
81 5734 ; 81 5733 ; 81 5719 ;
Abstract
A power tong has upper and lower clamping units mounted in a suspended support frame. Each clamping unit has pipe clamping jaws that move rectilinearly, and are actuated by a pressure fluid operated linear actuator. The lower clamping unit is rigidly secured to the supporting frame and the upper clamping unit is rotatable relative to the lower clamping unit. The relative rotation in both directions is accomplished by a remote powered actuator.