schmitt

Claim 1

A TORQUE WRENCH FOR USE WITH A SOURCE OF PRESSURE FLUID AT A PREDETERMINED PRESSURE, TO APPLY A PREDETERMINED TORQUE TO TWO COMPLEMENTAL AND SCREW-THREADELY CONNECTED ELEMENTS OF A FITTING OR THE LIKE, WHICH WRENCH COMPRISES AN INTERRUPTED RING GEAR FORMED AS A FIRST JAW MEMBER OF A SIZE TO STRADDLE ONE OF THE TWO THREADEDLY CONNECTED ELEMENTS OF THE FITTING, AND INCLUDING MEANS TO ENGAGE THE SAME AGAINST RELATIVE ROTATIONAL MOVEMENT DURING ROTATION OF ONE JAW RELATIVE TO A SECOND JAW, A COOPERATING SECOND JAW MEMBER OF A SIZE CAPABLE OF STRADDLING THE OTHER OF THE TWO THREADEDLY CONNECTED ELEMENTS OF THE FITTING, AND INCLUDING MEANS TO ENGAGE THE SAME AGAINST RELATIVE ROTATIONAL MOVEMENT DURING ROTATION OF ONE JAW MEMBER RELATIVE TO THE OTHER, A FLUID PRESSURE ROTARY MOTOR ININCLUDING A FIXED AND A MOVABLE MEMBER, AND MEANS INTERCONNECTING THE TWO SUCH MEMBERS TO THE RESPECTIVE JAWS, THE CONNECTION BETWEEN ONE JAW AND THE CORRESPONDING MOTOR MEMBER INCLUDING A TORQUE ARM OF GIVEN LENGTH, THROUGH WHICH RELATIVE ROTATION OF THE JAWS MAY BE EFFECTED, AND MEANS FOR CONNECTING SAID MOTOR TO THE PRESSURE SOURCE OF PREDETERMINED VALUE, WHEREBY TO APPLY TORQUE BETWEEN THE TWO JAWS OF A VALUE WHICH IS THE PRODUCT OF THE PRESSURE AT THE SOURCE TIMES THE LENGTH OF THE TORQUE ARM.