Friction device operating mechanism

Claim 1

A FRICTION DEVICE OPERATING MECHANISM COMPRISING A CYLINDER HAVING AN EXPANSIBLE FLUID PRESSURE CHAMBER THEREIN, MEANS FOR INTRODUCING FLUID PRESSURE INTO SAID CHAMBER, RESILIENTLY URGED MEANS NORMALLY OPPOSING FLUID PRESSURE EXPANSION OF SAID CHAMBER, A WORKING PORTION ON SAID RESILIENTLY URGED MEANS EXTENDING THROUGH SAID CHAMBER AND EXTERIORLY OF SAID CYLINDER, SAID WORKING PORTION BEING NORMALLY ENERGIZED BY SAID RESILIENTLY URGED MEANS WHEN THE FLUID PRESSURE IN SAID CHAMBER IS LESS THAN A PREDETERMINED AMOUNT, THREADED EXTENSION MEANS CONNECTED WITH SAID RESILIENTLY URGED MEANS AND DISPOSED IN OPPOSING RELATION TO SAID WORKING PORTION, DISABLING MEANS FOR SAID RESILIENTLY URGED MEANS INCLUDING CONCERTLY ROTATABLE DRIVING AND DRIVEN MEMBERS RELATIVELY MOVABLE INTO DRIVING ENGAGEMENT, SAID DRIVING MEMBER BEING IN BEARING ENGAGEMENT WITH SAID CYLINDER AND SAID DRIVEN MEMBER BEING IN THREADED ENGAGEMENT WITH SAID EXTENSION MEANS, SAID DRIVING AND DRIVEN MEMBERS BEING CONCERTLY ROTATABLE IN RESPONSE TO AN APPLIED FORCE ON SAID DRIVING MEMBER TO THREADEDLY MOVE SAID DRIVEN MEMBER ON SAID EXTENSION MEANS INTO DRIVING ENGAGEMENT WITH SAID DRIVING MEMBER, AND SAID DRIVING AND DRIVEN MEMBERS BEING FURTHER CONCERTLY ROTATABLE SUBSEQUENT TO THE DRIVING ENGAGEMENT THEREBETWEEN TO FURTHER THREADEDLY ENGAGE SAID DRIVEN MEMBER AND EXTENSION MEANS AND MECHANICALLY MOVE SAID RESILIENTLY URGED MEANS IN A DIRECTION TO EXPAND SAID CHAMBER AND DEENERGIZED SAID WORKING PORTION.