Well drilling pipe construction and the like

Claim 1

IN COMBINATION: A FIRST PIPE SECTION MADE OF ALUMINUM ALLOY AND INCLUDING A FIRST END PORTION WITH A FIRST END SHOULDER; A TOOL PIN JOINT MEMBER MADE OF STEEL SHRUNK ON SAID FIRST END PORTION AND INCLUDING A RADIALLY INWARDLY EXTENDING SHOULDER ON SAID JOINT MEMBER SMOOTHLY AND TIGHTLY ABUTTING SAID FIRST END SHOULDER ON SAID FIRST END PORTION, SAID FIRST END PORTION AND PIN JOINT MEMBER HAVING ALIGNED EQUAL FIRST INTERNAL FLOW CYLINDRICAL SURFACES WITH SMOOTHLY ABUTTING SHOULDERS; A SECOND PIPE SECTION MADE OF ALUMINUM ALLOY AND INCLUDING A SECOND END PORTION WITH A SECOND END SHOULDER; A TOOL BOX JOINT MEMBER MADE OF STEEL SHRUNK ON SAID SECOND END PORTION AND INCLUDING A RADIALLY INWARDLY EXTENDING SHOULDER ON SAID BOX JOINT MEMBER SMOOTHLY AND TIGHTLY ABUTTING SAID SECOND END SHOULDER, SAID SECOND END PORTION AND BOX JOINT MEMBER HAVING ALIGNED EQUAL SECOND INTERNAL FLOW CYLINDRICAL SURFACES WITH SMOOTHLY ABUTTING SHOULDERS, SAID SECOND INTERNAL FLOW CYLINDRICAL SURFACES BEING EQUAL TO AND ALIGNED WITH SAID FIRST INTERNAL FLOW CYLINDRICAL SURFACES, SAID JOINT MEMBERS HAVING A THREADED ENGAGEMENT WITH EACH OTHER WITH A TIGHT OUTER SHOULDER ABUTMENT AT ONE END OF SAID THREADED ENGAGEMENT AND WITH AN INWARDLY DIRECTED GROOVE CONSTRUCTION BETWEEN SAID JOINT MEMBERS AT THE OTHER END OF SAID TRHREADED ENGAGEMENT, THE MAIN INNER FLOW CYLINDRICAL SURFACES OF SAID JOINT MEMBERS BEING EQUAL AND THE REMAINING MINOR INTERNAL FLOW SURFACES OF SAID JOINT MEMBERS HAVING GENTLY AND SMOOTHLY TAPERED INNER JOINT MEMBER CIRCULAR FRUSTOCONICAL SURFACES AT A RELATIVELY SMALL ANGLE WITH RESPECT TO SAID CYLINDRICAL SURFACES FOR A RELATIVELY SHORT DISTANCE OUTWARDLY TOWARD AND ADJACENT SAID GROOVE CONSTRUCTION THE SIDE WALLS OF SAID GROOVE CONSTRUCTION FORMING RELATIVELY LARGE ANGLES WITH RESPECT TO SAID CYLINDRICAL SURFACES AND IN WHICH ONE OF SAID JOINT MEMBERS IS A DOWNSTREAM JOINT MEMBER AND THE OTHER OF SAID JOINT MEMBERS IS AN UPSTREAM JOINT MEMBER, AND IN WHICH THE LENGTH OF THE FRUSTOCONICAL SURFACE OF SAID UPSTREAM JOINT MEMBER IS LESS AND FORMS A SLIGHTLY GREATER SMALL ANGLE WITH RESPECT TO SAID CYLINDRICAL SURFACES THAN THE ANGLE WITH RESPECT TO SAID CYLINDRICAL SURFACE OF SAID DOWNSTREAM MEMBER, THE SIDE WALLS OF SAID GROOVE CONSTRUCTION INCLUDING A RELATIVELY WIDE FLAT END WALL ON SAID UPSTREAM JOINT MEMBER AND ADJACENT SAID THREADED ENGAGEMENT, AND A CONTINUOUS SLANTING FRUSTOCONICAL WALL AT THE BOTTOM OF SAID GROOVE CONSTRUCTION ON SAID DOWNSTREAM JOINT MEMBER, AND IN WHICH SAID SHORTER DISTANCE IS IN THE ORDER OF 1/6 INCH AND SAID SLIGHTLY GREATER SMALL ANGLE IS IN THE ORDER OF 10* WITH RESPECT TO THE LONGITUDINAL AXIS OF SAID JOINT MEMBERS AND IN WHICH SAID OTHER SHORT DISTANCE IS IN THE ORDER OF 1/2 INCH AND SAID OTHER SMALL ANGLE PRODUCES A WIDTH OF TAPER OF 1/16 OF AN INCH FROM SAID MAIN INNER CYLINDRICAL SURFACE AND IN WHICH SAID FLAT END WALL IS SUBSTANTIALLY PERPENDICULAR TO SAID CYLINDRICAL SURFACES AND IN WHICH SAID CONTINUOUS SLANTING FRUSTOCONICAL WALL IS DOWNWARDLY DIRECTED, AND IN WHICH THE OUTER WIDTH OF SAID GROOVE CONSTRUCTION IS IN THE ORDER OF 1/8", AND IN WHICH SAID GROOVE CONSTRUCTION IS IMMEDIATELY ADJACENT SAID THREADED ENGAGEMENT.