E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/14.7
E21B 19/00 (2006.01) B25B 13/00 (2006.01) E21B 19/10 (2006.01)
Patent
CA 1062237
ABSTRACT Hydraulically or pneumatically powered drill pipe tongs of the scissors-type used in making up or breaking apart joints of drill pipe or drill collars including an upper tong and a lower tong each including tong die heads for biting into or gripping the upper and lower joints of drill pipe or drill collars with the upper and lower tongs being swivelly con- nected and being interconnected by a hydraulically or pneumatically powered torqueing piston and cylinder assembly for rotating the upper and lower tongs in relation to each other when making up or breaking apart the drill pipe joints. Each of the upper and lower tongs includes a sliding door having one of the tong die heads thereon that can be moved a substantial distance toward and away from the tong body by the use of a pair of hydrau- lically or pneumatically powered piston and cylinder assemblies to enable tool joints and drill pipe protectors to pass through the tongs while leav- ing the tongs on the pipe. Each of the tongs also includes a hinged mount- ing for one edge portion of the tong door and a latch and slide for the other edge portion to enable the tong door to be latched or unlatched and hinged outwardly in a manner to enable the tongs to be removed from the drill pipe when necessary.
256597
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