Drill jumbo drillrod handler tongs has tong jawholder head end extended up to guide plate itself smooth one side and otherwise innermost-drillrod-adapted on other.

摘要

The wear jaw holders (11,12) on the head end (19) facing the guide plate (14) can be extended right up to the plate (14). The plate can be reversed to give a smooth edge one side and on the other side a projection with bowed center recess, itself adapted to the outside casing of the inner rod of a double drillstring. The extended holder end (19) comes in fork shape so as to enclose the guide plate (14). The jaw holders have their head ends (19) expanded both sides to lie nearer to and equally close to the drillrods (10). The second holder end (20) is also forked and the head end (19) fork edges should be bevelled off. The jaws (15) of the opposed holders (11,12) locate the gripped drillrod centrally and adjust it, the jaws anchored by retainer pins (16) homing arrestably into jaw holder holes.