Document Type and Number:
Japanese Patent JPH0464394
Kind Code:
B2
Abstract:
A lifting head having a gate arm (47), and a latch arm (63), pivotally secured to a frame (11). A clamping block (83), also mounted on the frame, is movable between a retracted position away from the drill collar and an extended position against the drill collar. A plurality of gripping inserts (95,97) are located on the clamping block and on the gate arm. Each insert has a body and a plurality of teeth (103). The bodies of the inserts may be vertical or angled, but the teeth of the inserts are angled with respect to the longitudinal axis of the drill collar. This allows the inserts to grip the drill collar, even if the lifting head grips the collar at a place having a spiral groove.
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Inventors:
JOO AARU BERII
UIRIAMU AARU HAMIRUTON
AACHII ERU BURATSUKU
UIRIAMU AARU HAMIRUTON
AACHII ERU BURATSUKU
Application Number:
JP796787A
Publication Date:
October 14, 1992
Filing Date:
January 16, 1987
Export Citation:
Assignee:
BAKER HUGHES INC
International Classes:
E21B17/16; E21B19/06; E21B19/14
Next Patent: CLEANING APPARATUS FOR SOLVENT DRY CLEANING