Automatic scraper for use in deep wells

Claim 1

AN AUTOMATIC SCRAPER OPRATING SYSTEM FOR USE IN DEEP WELLS COMPRISING IN COMBINATION, A SCRAPER FOR OPERATION IN A DEEP WELL, A WIRE LINE FOR SUSPENDING SAID SCRAPER WITHIN SAID WELL, A REEL FOR CONTAINING SAID WIRE LINE TO POSITION SAID SCRAPER OVER THE LENGTH OF THE WELL, A PNEUMATIC MOTOR CONNECTED TO DRIVE SAID REEL FOR MOVING THE SCRAPER UP AND DOWN THE WELL, AND A CONTROL SYSTEM FOR SAID MOTOR COMPRISING A PISTON ACTUATED VALVE FOR REVERSIBLY CONTROLLING THE SUPPLY OF PNEUMATIC FLUID TO THE MOTOR HAVING A PISTON AND CYLINDER MEANS FOR ACTUATION THEREOF, A MEASURING WHEEL UNIT IN CONTACT WITH SAID WIRE LINE TO DETERMINE THE POSITION OF THE SCRAPER IN THE WELL, A TIMING UNIT HAVING A VALVE ACTUATED BY SAID TIMING UNIT, A FIRST PAIR OF THREE WAY VALVES CONNECTED TO AND FOR ACTUATION BY SAID MEASURING WHEEL UNIT, A SECOND PAIR OF THREE WAY VALVES EACH HAVING PRESSURE CONTROLLED ACTUATORS, AND A PNEUMATIC CIRCUIT FOR CONTROLLING THE ACTUATION OF SAID PISTON INCLUDING A CONNECTION FOR RECEIVING PNEUMATIC FLUID UNDER PRESSURE, A PARALLEL CIRCUIT CONNECTION FROM SAID RECEIVING CONNECTION TO ONE SIDE OF SAID TIMING UNIT VALVE AND TO ONE OF SAID SECOND PAIR OF THE THREE WAY VALVES, A CIRCUIT CONNECTION FROM SAID ONE OF THE SECOND PAIR OF THREE WAY VALVES TO ONE OF SAID FIRST PAIR OF THREE WAY VALVES, A PARALLEL CIRCUIT CONNECTION FROM SAID ONE OF THE FIRST PAIR OF THREE WAY VALVES TO THE ACTUATOR OF THE OTHER OF SAID SECOND PAIR OF THREE WAY VALVES AND TO ONE SIDE OF SAID PISTON, A CIRCUIT CONNECTION FROM THE OTHER SIDE OF SAID TIMING UNIT VALVE TO THE OTHER OF SAID SECOND PAIR OF THREE WAY VALVES, A CIRCUIT CONNECTION FROM SAID OTHER OF SAID SECOND PAIR OF THREE WAY VALVES, A PARALLEL CIRCUIT CONNECTION FROM SAID OTHER OF THE FIRST PAIR OF THREE WAY VALVES TO THE ACTUATOR OF THE SAID ONE OF SAID SECOND PAIR OF THREE WAY VALVES AND TO THE OTHER SIDE OF SAID PISTON, WHEREBY ACTUATION OF SAID TIMING UNIT VALVE WILL INITATE A CYCLE OF SCRAPER OPERATION TO CAUSE SAID MOTOR TO RUN IN A PREDETERMINED DIRECTION UNTIL ONE OF SAID FIRST PAIR OF THREE WAY VALVES IS ACTUATED WHEN THE MOTOR WILL BE REVERSED AND RUN IN THE OPPOSITE DIRECTION UNTIL THE OTHER OF SAID FIRST PAIR OF THREE WAY VALVES IS ACTUATED WHEN THE MOTOR WILL BE STOPPED BECAUSE OF THE CLOSING OF SAID TIMING UNIT VALVE IN THE MEANTIME.