EP 0504258 A4 19930922 - POWER TONGS WITH IMPROVED GRIPPING MEANS
Title (en)
POWER TONGS WITH IMPROVED GRIPPING MEANS
Publication
Application
Priority
US 44741989 A 19891207
Abstract (en)
[origin: WO9108866A1] 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).
IPC 1-7
IPC 8 full level
B25B 13/50 (2006.01); E21B 19/16 (2006.01)
CPC (source: EP)
B25B 13/5075 (2013.01); E21B 19/164 (2013.01)
Citation (search report)
- No further relevant documents disclosed
- See references of WO 9108866A1
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
WO 9108866 A1 19910627; EP 0504258 A1 19920923; EP 0504258 A4 19930922
DOCDB simple family (application)
US 9007066 W 19901207; EP 91901120 A 19901207