Jaw assembly for gripping pipes

Details Jaw assembly for gripping pipes Jaw assembly for gripping pipes

E - Fixed Constructions

21

B

E21B 19/16 (2006.01)

Patent

CA 2480735

A jaw assembly for a power tong or back-up tong is provided with a jaw die plate and a die seating surface that are shaped to permit radial insertion of the die plate (7) onto its seating surface (2). Both vertical (4) and horizontally (6) aligned splines, or spline segments are present on the seating surface. The vertical splines are interrupted along on at the end of their lengths by gaps (5a). Grooves (11) along with the protrusions (10) on the mating surface of the die plate interfit between the splines and/or spline segments and gaps to stabilize, or anchor the die plate on the seating surface against vertical displacement and to absorb rotational torque forces. The portion of the protrusions on the die plate that are positioned to extend into the gaps in the vertical splines support the die plate against vertical shearing forces, resisting disengagement of the die plate from its seating surface.

L'invention concerne un ensemble mâchoire pour une clé de vissage automatique ou pour une clé de dévissage, lequel ensemble mâchoire est pourvu d'un plateau mobile à mâchoire et d'une surface de logement de plateau qui sont taillés de manière à permettre une insertion radiale du plateau mobile (7) sur sa surface de logement (2). Des languettes alignées verticalement (4) et horizontalement (6), ou des segments de ces languettes, sont prévus sur cette surface de logement. Les languettes verticales sont interrompues à leur extrémité par des vides (5a). Des rainures (11) associées à des protubérances (10) ménagées sur la surface d'ajustement du plateau mobile s'insèrent entre les languettes et/ou les segments de languette et les vides de manière à stabiliser ou à fixer le plateau mobile sur la surface de logement afin d'éviter le déplacement vertical et d'absorber les forces du couple rotatif.

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