Patent ID: 7125195
Filing Date: 2006-10-24
Classification: E21B,F16B,Y10T

Abstract:
1. A locking arrangement in combination with a clamping jaw used to clamp drill pipes and casings, comprising: a slider ( 2 ) that extends axially in the clamping jaw in a first dovetail slot ( 3 ), the slider ( 2 ) having teeth ( 10 ) thereon for gripping drill pipes or casings, a second dovetail slot ( 4 ) oriented perpendicularly to the first dovetail slot ( 3 ); a locking bracket ( 5 ) in the second dovetail slot ( 4 ) and being movable from a position in which the slider is locked by the locking bracket ( 5 ) to a position wherein the slider is unlocked, and a screw ( 6 ) disposed through a countersunk hole ( 9 ) in the locking bracket ( 5 ), whereby the locking bracket ( 5 ) is maintained to lock the slider ( 2 ) by the screw ( 6 ) or released from locking the slider ( 2 ) by axially sliding in the second dovetail slot ( 4 ) upon loosening the screw ( 6 ).