Predetermined torque release wrench

Claim 1

IN A TORQUE WRENCH HAVING A HOLLOW BODY AND HAVING A WORK-ENGAGING MEMBER ROTATABLY MOUNTED ON THE BODY, SAID WORK-ENGAGING MEMBER BEING OPERATIVELY CONNECTED TO A SWINGABLE ARM INSIDE THE BODY EXTENDING LONGITUDINALLY OF THE BODY, MEANS COOPERATIVE WITH THE SWINGABLE ARM FOR PREDETERMINED RESISTANCE TO SWINGING MOVEMENT OF THE ARM AWAY FROM A NORMAL POSITION, SAID COOPERATIVE MEANS COMPRISING: A PRESSURE MEMBER MOUNTED INSIDE THE BODY WITH A LEADING END DIRECTED TOWARDS THE ARM AND FREELY MOVABLE AXIALLY OF THE BODY TOWARDS AND AWAY FROM THE SWINGING END OF THE ARM, SAID LEADING END HAVING A CENTRAL PROJECTION; SPRING MEANS URGING THE PRESSURE MEMBER TOWARDS THE ARM; AND A SHOE HAVING A TRANSVERSE FACE IN ABUTMENT WITH BOTH SAID LEADING END AND SAID PROJECTION THEREOF THE PRESSURE MEMBER TO RECEIVE PRESSURE THEREFROM, THE SHOE BEING PIVOTALLY CONNECTED TO THE ARM AT THE SWINGING END THEREOF TO CONSTITUTE THEREWITH A TOGGLE LINKAGE IN ENDWISE ABUTMENT AGAINST THE PRESSURE MEMBER, THE LINKAGE BEING MOVABLE WITH KNEE ACTION FOR LONGITUDINAL EXTENSION OF THE LINKAGE TO RETRACT THE PRESSURE MEMBER IN RESPONSE TO A LOAD OF A PREDETERMINED MAGNITUDE ON THE WORK-ENGAGING MEMBER, THE HOLLOW BODY CONFINING THE KNEE ACTION OF THE LINKAGE TO LIMIT THE TILTING OF THE SHOE IN RESPONSE TO THE LOAD, THE SHOE BEING BISTABLE WITH TWO OPPOSITE NORMAL STARTING TILT POSITIONS DEPENDING ON THE DIRECTION OF THE INITIAL LOAD ON THE ARM WHEN THE WRENCH APPLIES A TORQUE THROUGH THE WORK-ENGAGING MEMBER, SAID TWO OPPOSITE STARTING TILTING POSITIONS BEING SYMMETRICAL WITH RESPECT TO THE LONGITUDINAL AXIS OF THE HOLLOW BODY, SAID SHOE BEING TILTABLE FROM A NORMAL TILT POSITION TO A POSITION OF GREATER TILT IN RESPONSE TO THE LOAD OF PREDETERMINED MAGNITUDE WITH CONSEQUENT RETRACTION OF THE PRESSURE MEMBER.