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1. (WO1991008866) POWER TONGS WITH IMPROVED GRIPPING MEANS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/008866 International Application No.: PCT/US1990/007066
Publication Date: 27.06.1991 International Filing Date: 07.12.1990
Chapter 2 Demand Filed: 05.07.1991
IPC:
B25B 13/50 (2006.01) ,E21B 19/16 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
25
HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; HANDLES FOR HAND IMPLEMENTS; WORKSHOP EQUIPMENT; MANIPULATORS
B
TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
13
Spanners; Wrenches
48
for special purposes
50
for operating on work of special profile, e.g. pipes
E FIXED CONSTRUCTIONS
21
EARTH OR ROCK DRILLING; MINING
B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
19
Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
16
Connecting or disconnecting pipe couplings or joints
Applicants:
WESCH, William, E., Jr. [US/US]; US
Inventors:
WESCH, William, E., Jr.; US
Agent:
KANZ, Jack, A.; Richards, Medlock & Andrews 4500 Renaissance Tower 1201 Elm Street Dallas, TX 75270-2197, US
Priority Data:
447,41907.12.1989US
Title (EN) POWER TONGS WITH IMPROVED GRIPPING MEANS
(FR) PINCES MECANIQUES A ORGANES DE PREHENSION AMELIORES
Abstract:
(EN) Power tongs and back-ups are disclosed which have improved means for gripping pipe and tubular members. Torque is applied and held with minimum damage to the pipe or tubular member. A plurality of gripping assemblies (20), each consisting of a pivoted jaw (143) having a friction surface, are mounted on a drag ring (106). Rotational resistance is selectively applied to the drag ring (106) to cause the jaws to make contact with or be released from the pipe (120) prior to any torque being applied to the pipe (120). Various modifications of the gripping assemblies (20) are disclosed to provide better gripping contact with the pipe (120).
(FR) L'invention a pour objet des pinces mécaniques et des supports possédant des moyens améliorés de préhension pour des tuyaux et des éléments tubulaires. Un couple est appliqué et maintenu en endommageant le moins possible le tuyau ou l'élément tubulaire. Plusieurs ensembles de préhension (20), chacun consistant en une mâchoire articulée (143) avec une surface de friction, sont montés sur une couronne d'accouplement (106). Une résistance de rotation est appliquée sélectivement à la couronne d'accouplement (106), provoquant la mise en contact des mâchoires avec le tuyau (120) ou leur éloignement de celui-ci avant l'application d'un quelconque couple sur le tuyau (120). Différentes modifications des ensembles de préhension (20) sont décrites afin d'améliorer le contact de préhension avec le tuyau (120).
Designated States: CA
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0504258