Patent Number: 6,637,296

Title: Jaw assembly for gripping pipes

Abstract: A jaw assembly for a power tong or back-up tong is provided with a jaw die plate and die seating surface that are shaped to permit radial insertion of the die plate onto its seating surface. Both vertical and horizontally aligned splines, or spline segments are present on the seating surface. Grooves between the protrusions on the mating surface of the die plate interfit between the splines and/or spline segments to stabilize the die plate and to absorb both rotational torque forces and vertical shearing forces without disengagement from its seating surface.

Inventors: Dagenais; Dan (Edmonton, Alberta, CA), Fraser; Jonathan Brent (St. Alberta, Alberta, CA), Szalacsi; Leslie L. (Ononway, Alberta, CA), Basler; Hermann (Stony Plain, Alberta, CA)

Assignee:

International Classification: E21B 19/16 (20060101); E21B 19/00 (20060101); B25B 013/50 (); B25B 013/58 ()

Expiration Date: 10/28/2020