Patent ID: 9605775
Date: 2017-03-28
CPC Classifications: E21B,F16L

Claim:
1. A clamp for use in disengagably locking together a pair of cylindrical tubular joints of oilfield pipe, selected from the group consisting of drill pipe and well casing, to convert them into a flat structure that resists rotation and is suitable to function as a chock on drill rig pipe racks, comprising: a pair of jaws having opposed rounded concave inner surfaces configured and dimensioned to conform with the outer side surfaces of the pipe joints and to extend down past their notional midlines; and an assembly for supporting the jaws and operative to move them together and apart, so that, in use, the clamp may be positioned over the pair of joints and the jaws tightened against the joints' outer side surfaces to lock the joints together in contiguous contact.