Tools – Wrench – screwdriver – or driver therefor – Machine
Reexamination Certificate
2011-01-04
2011-01-04
Thomas, David B (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Machine
C081S057340, C081S057350
Reexamination Certificate
active
07861619
ABSTRACT:
A power tong construction in particular designed to annul compulsory forces that may arise within the tong construction during makeup/breakout operations of pipe joints in a string of pipes, is shown. The power tong construction is one unit having a main frame carrying a torque tong and a backup tong. The main frame is located on a drill floor on board a vessel or fixed installation, and is moveably arranged in guide rails. The torque tong is loosely suspended and “floatingly” arranged in the power tong construction, said power tong thereby having a limited freedom of motion in all directions in the horizontal plane and vertical plane, and has means to counteract external rotation and annulment of compulsory forces, when the power tong makes up/breaks out pipe joints, arranged between the power tong and the main frame.
REFERENCES:
patent: 5081888 (1992-01-01), Schulze-Beckinghausen
patent: 5161438 (1992-11-01), Pietras
patent: 5259275 (1993-11-01), Schulze-Beckinghausen
patent: 5390568 (1995-02-01), Pietras
patent: 2004/0195555 (2004-10-01), Bangert et al.
patent: 1 559 865 (2005-08-01), None
patent: WO 02/00395 (2002-01-01), None
International Search Report for PCT/NO2007/000199, mailed Sep. 11, 2007.
Written Opinion of the International Searching Authority for PCT/NO2007/000199, mailed Sep. 11, 2007.
Norwegian Search Report for NO Application No. 20062669, dated Jun. 7, 2007.
Aker Kvaerner MH AS
Nixon & Vanderhye PC
Thomas David B
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