Patent ID: 6742419
Filing Date: 2004-06-01
Classification: B25B

Abstract:
A wrench for gripping any one of a plurality of cylindrical workpieces having different diameters comprising, a handle having longitudinally opposite ends, a fixed jaw on one of said ends, said fixed jaw comprising a plurality of teeth laterally therealong and facing longitudinally outwardly of said one end, said teeth including a plurality of discrete teeth, each discrete tooth being for a different one of a plurality of cylindrical workpieces having different diameters, a pivotal jaw member having first and second jaw faces at an angle to one another and each including a plurality of teeth facing inwardly of said one end, said pivotal jaw member being mounted on said one end for displacement of said first and second jaw surfaces about a jaw axis toward and away from said fixed jaw, a workpiece of given diameter to be gripped by the wrench being cradled between said first and second jaw faces and engaged by the one of said plurality of discrete teeth provided on said fixed jaw for the workpiece of given diameter, and each of said discrete teeth having an apex and the apex of each discrete tooth being angularly offset from the apex of the preceding discrete tooth relative to said jaw axis by an angle R which is determined by the formula R=TRÃ—D&it;â€ƒ&it;1-D2D3-D2wherein TR is the total rotation of the pivoted jaw member about the jaw axis relative to the fixed jaw, D1 is the outer diameter of the workpiece succeeding the workpiece corresponding to the preceding discrete tooth, D2 is the outer diameter of the smallest of the plurality of workpieces to be gripped, and D3 is the outer diameter of the largest of the plurality of workpieces to be gripped.