Patent ID: 8434389

Claim:
A torque wrench comprising: a hollow housing comprising a cylindrical outer wall having a proximal end and a distal end, and a cylindrical inner wall having a proximal end and a distal end, said cylindrical inner wall being spaced from said cylindrical outer wall so as to provide a cylindrical gap therebetween, said proximal end of said cylindrical outer wall being connected to said proximal end of said cylindrical inner wall, and said distal end of said cylindrical outer wall being configured to engage a workpiece housing; and a mechanical multiplier disposed within said cylindrical inner wall of said hollow housing, said mechanical multiplier comprising a torque input shaft and a torque output shaft, said mechanical multiplier being connected to said cylindrical inner wall of said hollow housing by a loose, non-binding connection, and said torque output shaft being configured to engage a workpiece fastener; wherein said loose, non-binding connection is a loose, non-binding spline connection; wherein said loose, non-binding spline connection comprises a first set of splines disposed on said cylindrical inner wall of said hollow housing and a second set of splines disposed on a hollow mount which is secured to said mechanical multiplier; and further wherein said first set of splines and said second set of splines are formed so that there is a small but perceptible degree of play between the splines when torque is applied, whereby to form said loose, non-binding spline connection and thereby eliminate the deadband effect.