Well-logging control system for regulating the tension in a drill line

Claim 1

IN A SYSTEM FOR REGULATING DRILL LINE TENSION AS SUCCESSIVELY DEEPER FORMATIONS ARE PENETRATED, DRUM MEANS ROTATABLE IN RESPONSE TO TENSION IN THE DRILL LINE MOUNTED TO SUPPORT A SUPPLY OF SAID DRILL LINE AND PROVIDED WITH BRAKING MEANS THEREON FOR RELEASE THROUGH TENSION IN THE DRILL LINE AND REAPPLICATION THROUGH ROTATION OF THE DRUM, MEANS FOR EXERTING A VARIABLE FORCE ON SAID BRAKING MEANS INCLUDING A PLANETARY GEAR ASSEMBLY, A CLUTCH MEANS FOR SAID DRUM MEANS AND PLANETARY GEAR ASSEMBLY HAVING A FIRST CLUTCH MEMBER AND A CO-ACTING CLUTCH MEMBER, SAID PLANETARY GEAR ASSEMBLY INCLUDING A FIRST GEAR MEANS AND A BRAKE-OPERATING PART ROTATABLE IN THE SAME DIRECTION BUT IN A DIRECTION OPPOSITE TO THE DIRECTION OF DRUM ROTATION AND BEING ROTATABLE IN OPPOSITE DIRECTIONS RELATIVE TO EACH OTHER, A FLUID OPERABLE MOTOR MOUNTED TO SUPPLY INPUT TORQUE TO SAID FIRST GEAR MEANS, A PLANETARY GEAR ELEMENT OF SAID ASSEMBLY CARRIED BY THE FIRST CLUTCH MEMBER GEARED TO SAID PART, A FLUID PRESSURE CIRCUIT, A CONTROL VALVE MECHANISM IN SAID CIRCUIT, A FIRST BRANCH SUPPLY CONDUIT IN SAID CIRCUIT WHEREBY PRESSURE IN SAID CONDUIT WILL URGE SAID CONTROL VALVE MEANS TOWARD CLOSED POSITION, A SECOND BRANCH SUPPLY CONDUIT IN SAID CIRCUIT INCLUDING A DIAPHRAGM SENSOR RESPONSIVE TO TENSION IN SAID DRILL LINE OPERABLE TO INITIATE FLOW OF FLUID PRESSURE TO SAID MOTOR, SAID CIRCUIT HAVING A FIRST BRANCH CONDUIT PORTION FROM SAID SENSOR TO SAID CONTROL VALVE MEANS FOR PASSAGE OF FLUID PRESSURE TO SAID CONTROL VALVE MEANS TO OVERBALANCE AND VARIABLY OPEN IT, AND A SECOND BRANCH CONDUIT PORTION IN SAID CIRCUIT FOR PASSAGE OF FLUID PRESSURE TO THEREBY ENGAGE SAID CLUTCH MEMBERS.