TUBE WRENCH FOR STALKS OF LARGE DIAMETRE Russian patent published in 2009 - IPC B25B13/50 

FIELD: mechanical engineering.

SUBSTANCE: invention refers to hand tools, specifically to tube wrench for screwing and unscrewing of large-diametre stalks. The tube wrench for stalks of large diametre contains taws, handle, bushing and dies. One of the jaws is fixed and combined with handle, and the other jaw is replaceable and can move along the handle. On the inner surface of jaw faced to wrench opening, replaceable die is placed on the exterior side of which the scalloped surface is performed. The teeth of this surface are faced in opposite direction from the wrench opening. Upper part of replaceable jaw has through hole where the end part of jaw is located. Bottom surface of through hole is at an angle to handle axis. This angle is equal to jaw displacement angle. A cannelure is made on upper part of fixed jaw adjacent to the handle. Between the upper part of fixed jaw and cannelure there is jove where bushing is placed on the interior surface of which thread is made and on its exterior surface notch is made. The interior surface of fixed jaw faced to wrench opening is placed at angle of displacement from handle axis. This angle is equal to 2-4 degrees. Replaceable die located on fixed jaw exterior surface is screw-attached to it; teeth of fixed jaw replaceable die and teeth of replaceable jaw have shape of scalene triangle with angles of legs equal to 30 and 60 degrees respectively. Teeth inclination of replaceable die is directed to wrench opening and teeth inclination of replaceable jaw is directed off the wrench opening.

EFFECT: providing possibility of screwing and unscrewing of pipes of large diametre and various sizes.

4 dwg, 1 tbl