Oil well scraper

Claim 1

A DEVICE CAPABLE OF BEING MOUNTED ON THE LOWER END OF A TUBING OR DRILL STRING AND WHEN SO MOUNTED CAN BE USED TO REMOVE FOREIGN MATERIAL ADHERING TO THE INTERIOR SURFACE OF A TUBULAR MEMBER, WHICH MEMBER CAN VARY IN INTERNAL DIAMETER BETWEEN FIRST AND SECOND LIMITS, INCLUDING: (A) A RIGID ELONGATE BODY, THE UPPER PORTION OF WHICH IS EXTERIORLY THREADED AND FROM WHICH BODY A PLURALITY OF LONGITUDINALLY SPACED FRUSTO-CONICAL PORTIONS PROJECT OUTWARDLY BELOW SAID THREADS THAT DEFINE A PLURALITY OF CIRCUMFERENTIALLY EXTENDING CAM SURFACES WHICH SLOPE UPWARDLY AND OUTWARDLY; (B) FIRST MEANS FOR REMOVABLY ENGAGING SAID UPPER PORTION AND THE LOWER END OF SAID STRING TO SUPPORT SAID BODY IN A DEPENDING POSITION THEREFROM; (C) A PLURALITY OF RIGID BLADES CIRCUMFERENTIALLY SPACED ABOUT SAID BODY, WHICH BLADES ARE PROVIDED WITH INWARDLY DISPOSED CAM FACES THAT ARE IN LONGITUDINALLY SLIDABLE CONTACT WITH SAID CAM SURFACES; (D) A TRANSVERSELY PROJECTING MEMBER SUPPORTED FROM THE LOWER PORTION OF SAID BODY; (E) A COMPRESSED HELICAL SPRING WHICH ENCIRCLES SAID BODY, WITH THE LOWER END OF SAID SPRING RESTING ON THE UPPER END OF SAID PROJECTING MEMBER; (F) TUBULAR MEANS FOR HOLDING SAID RIGID BLADES IN FIXED LONGITUDINAL RELATIONSHIP, WITH THE UPPER END OF SAID HELICAL SPRING BEING IN CONTACT WITH SAID TUBULAR MEANS; AND (G) A LOCK NUT THAT ENGAGES SAID THREADS ON SAID UPPER PORTION OF SAID ELONGATE BODY, WHICH NUT WHEN ROTATED IN A DIRECTION TO MOVE UPWARDLY RELATIVE TO SAID ELONGATE BODY ALLOWS SAID TUBULAR MEANS AND BLADES TO ALSO MOVE UPWARDLY RELATIVE THERETO, WITH SAID BLADES MOVING OUTWARDLY TO THE EXTENT THAT THEY ARE IN DRAGGING CONTACT WITH THE INTERIOR SURFACE OF SAID TUBULAR MEMBER TO BE SCRAPED, BUT UPON EXERTION OF AN UPWARD FORCE OF SUFFICIENT MAGNITUDE ON SAID ELONGATE BODY SAID SPRING IS FURTHER COMPRESSED TO ALLOW SAID ELONGATE BODY TO MOVE UPWARDLY RELATIVE TO SAID TUBULAR MEANS AND BLADES TO THE EXTENT THAT SAID BLADES CAN MOVE INWARDLY RELATIVE TO SAID CAM SURFACES TO POSITIONS WHERE SAID DEVICE CAN BE REMOVED UPWARDLY THROUGH SAID TUBULAR MEMBER.

Claim 2

A DEVICE CAPABLE OF BEING MOUNTED ON THE LOWER END OF A TUBING OR DRILL STRING AND WHEN SO MOUNTED CAN BE USED TO REMOVE FOREIGN MATERIAL ADHERING TO THE INTERIOR SURFACE OF A TUBULAR MEMBER, WHICH MEMBER CAN VARY IN INTERNAL DIAMETER BETWEEN FIRST AND SECOND LIMITS, INCLUDING: (A) A RIGID ELONGATE BODY, THE UPPER PORTION OF WHICH IS EXTERIORLY THREADED AND FROM WHICH BODY A PLURALITY OF LONGITUDINALLY SPACED FRUSTO-CONICAL PORTIONS PROJECT OUTWARDLY BELOW SAID THREADS THAT DEFINE A PLURALITY OF CIRCUMFERENTIALLY EXTENDING CAM SURFACES WHICH SLOPE UPWARDLY AND OUTWARDLY; (B) FIRST MEANS FOR REMOVABLY ENGAGING SAID UPPER PORTION AND THE LOWER END OF SAID STRING TO SUPPORT SAID BODY IN A DEPENDING POSITION THEREFROM; (C) A PLURALITY OF RIGID BLADES CIRCUMFERENTIALLY SPACED ABOUT SAID BODY, WHICH BLADES ARE PROVIDED WITH INWARDLY DISPOSED CAM FACES THAT ARE IN LONGITUDINALLY SLIDABLE CONTACT WITH SAID CAM SURFACES; (D) A TRANSVERSELY PROJECTING MEMBER SUPPORTED FROM THE LOWER PORTION OF SAID BODY; (E) A COMPRESSED HELICAL SPRING WHICH ENCIRCLES SAID BODY, WITH THE LOWER END OF SAID SPRING RESTING ON THE UPPER END OF SAID PROJECTING MEMBER; (F) TUBULAR MEANS FOR HOLDING SAID RIGID BLADES IN FIXED LONGITUDINAL RELATIONSHIP, WITH THE UPPER END OF SAID HELICAL SPRING BEING IN CONTACT WITH SAID TUBULAR MEANS; AND (G) A LOCK NUT THAT ENGAGES SAID THREADS ON SAID UPPER PORTION OF SAID ELONGATE BODY, WHICH NUT WHEN ROTATED IN A DIRECTION TO MOVE UPWARDLY RELATIVE TO SAID ELONGATE BODY ALLOWS SAID TUBULAR MEANS AND BLADES TO ALSO MOVE UPWARDLY RELATIVE THERETO, WITH SAID BLADES MOVING OUTWARDLY TO THE EXTENT THAT THEY ARE IN DRAGGING CONTACT WITH THE INTERIOR SURFACE OF SAID TUBULAR MEMBER TO BE SCRAPED, BUT UPON EXERTION OF AN UPWARD FORCE OF SUFFICIENT MAGNITUDE ON SAID ELONGATE BODY SAID SPRING IS FURTHER COMPRESSED TO ALLOW SAID ELONGATE BODY TO MOVE UPWARDLY RELATIVE TO SAID TUBULAR MEANS AND BLADES TO THE EXTENT THAT SAID BLADES CAN MOVE INWARDLY RELATIVE TO SAID CAM SURFACES TO POSITIONS WHERE SAID DEVICE CAN BE REMOVED UPWARDLY THROUGH SAID TUBULAR MEMBER.