Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1976-09-30
1978-04-04
Jones, Jr., James L.
Tools
Wrench, screwdriver, or driver therefor
Machine
81 5719, 81 5734, B25B 1700
Patent
active
040820173
ABSTRACT:
Hydraulically or pneumatically powered drill pipe tongs of the scissors-type used in making up or breaking apart joints of drill pipe, drill collars and the like 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, drill collars and the like with the upper and lower tongs being swivelly connected and being swivelled 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 hydraulically or pneumatically powered piston and cylinder assemblies to enable tool joints, drill pipe protectors and the like to pass through the tongs while leaving the tongs on the pipe. Each of the tongs also includes a hinged mounting for one edge portion of the tong door and a latch for the other edge portion to enable the tong door to be latched or unlatched and swung outwardly in a manner to enable the tongs to be removed from the drill pipe when necessary.
REFERENCES:
patent: 2705614 (1955-04-01), McKibben et al.
patent: 2724201 (1955-11-01), Calvalero
patent: 3629927 (1971-12-01), Palmer
patent: 3760658 (1973-09-01), Guier
patent: 3799009 (1974-03-01), Guier
Eckel Manufacturing Co.
Jones Jr. James L.
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