WIVES IMPROVED THAT INCLUDING A COUPLE OF ELEMENTS EQUAL linked through hinge pins, and wherein each element formed by a pair of flat rings BETWEEN articulating a toothed SHUTTING THE WIFE, AND COUNTING EVERY RING PLANE WITH EXPANSION KEYSTONE SO THAT BETWEEN THE TWO IS PLACED the locking mechanism-unlocking operable by the wrench, essentially characterized in that the said mechanism basically consists of three parts associated with each other, ONE OF WHICH IS FORMED BY A RATCHET TILT WITH SECTOR toothing GEARS WITH SECTOR locking toothing, PRODUCING THE LOCKING OF THIS, wHILE THE SECOND PIECE IS A SQUARE STRETCHED ENFRENTADAMENTE SITUATED a side hole provided between BOTH trapezoid eXPANSIONS IN WHICH HOLE enclosing a APPENDIX CILINDRICO IN WHICH eXTENDS ONE OF THE ENDS SQUARE; It is provided that the third piece is formed by a SPRING FORTH BETWEEN THE TWO EARLIER, tending to push TO RATCHET WITH locked position locking toothing sector.
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