TUBE WRENCH FOR OIL-WELL AND DRILL PIPES Russian patent published in 2009 - IPC B25B13/50 

FIELD: mechanics.

SUBSTANCE: tube wrench contains jaw, forming to each other cavity - wrench opening, handle and dowels, fixing nut, implemented with ability of axial advance lengthwise the handle. One of jaws - is fixed and implemented as matched with handle, and other - detachable is implemented with ability of axial advance lengthwise the lengthwise. Jaws are implemented with chamfered relative to longitudinal axis of wrench handle by inner surfaces and anaxial to each other. On external side of dowel, located on inner side of mobile jaw, directed to wrench opening, it is implemented toothed surface, analogous toothed surface is implemented on inner side directed to wrench opening, fixed jaw. Handle, cross section of which is implemented in the form of double tee, is implemented with wave-like flange on its top side. Dowel, located on internal side of detachable jaw, is implemented detachable and is fixed on specified surface by means of screws. Teeth of toothed surfaces of jaws are implemented with angle between sides of neighboring teeth 90° and inclination of teeth surface, directed to the side of loading for screwdriving or unfastening, equal to 30°, on side surfaces of handle there are implemented pricks of size 0.25h, where h - thickness of handle, on opposite from fixed jaw side of handle it is implemented though opening.

EFFECT: it is provided expansion of functional capabilities of tube wrench ensured by providing the ability to implement screwdriving and unfastening of pipes of different dimension-type.

6 dwg