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:
Aug. 27, 2002
Filed:
Aug. 15, 2000
Dennis Penisson, Raceland, LA (US);
Bilco Tools, Inc., Houma Air Base, Houma, LA (US);
Abstract
A power tong for making up and breaking apart threaded oilfield tubular connections includes a frame having an open throat , a rotary ring having an open throat , and a door for closing over the open throat for safety. Hydraulic motor is regulated by a control valve for rotating the ring which in turn rotates the oilfield tubular. A switch responsive to the position of the door controls the flow of air pressure to a cylinder , which renders active valve operator which controls valve . According to the method of the invention, the door must first be closed so that the switch renders the valve operator active, and the valve operator must be reset once the door is opened before it can be manipulated to operate the motor control valve