E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 19/16 (2006.01) B25B 13/50 (2006.01) B25B 15/00 (2006.01)
Patent
CA 2512940
An apparatus for positioning a tong comprises a piston and cylinder assembly and a mounting assembly therefor. The mounting assembly is mounted on a support beam in the drilling derrick and the piston and cylinder assembly is pivotally mounted on the mounting assembly. The piston and cylinder assembly can be pivoted between an operative position in which it can be extended and retracted to move a tong towards and away from a string of tubulars, and an inoperative position in which the piston and cylinder assembly extends along an upwardly extending axis with part of the piston and cylinder assembly disposed to either side of the mounting assembly.
Marks & Clerk
Weatherford/lamb Inc.
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