Methods of producing strong threaded anchorages

Claim 1

THE METHOD OF PRODUCING A STRONG THREADED ANCHORAGE IN A WORKPIECE FORMED OF RELATIVELY SOFT METAL, COMPRISING PROVIDING A SUBSTANTIALLY CYLINDRICAL BORE IN SAID WORKPIECE, PROVIDING A FERRULE FORMED OF RELATIVELY HARD SHEET METAL CHARACTERIZED BY PLASTIC FLOW UNDER SWAGING PRESSURE AND HAVING A SUBSTANTIALLY CYLINDRICAL OPENING THEREIN, SECURING SAID FERRULE IN PLACE IN SAID BORE WITH THE EXTERIOR SURFACE OF SAID FERRULE IN FRICTIONAL ENGAGEMENT WITH THE ADJACENT SURFACE OF SAID WORKPIECE INTERIORLY OF SAID BORE AND SUBJECTING THE INTERIOR SURFACE OF SAID FERRULE TO SWAGING PRESSURE WITH AN EXTREMELY HARD THREAD-SWAGING MEMBER SO AS SIMULTANEOUSLY TO SWAGE AN INTERNAL THREAD UPON THE INTERIOR SURFACE OF SAID FERRULE AND TO SWAGE AN EXTERNAL THREAD-LIKE STRUCTURE UPON THE EXTERIOR SURFACE OF SAID FERRULE AND TO COMPRESS AN INTERNAL THREADLIKE STRUCTURE UPON SAID WORKPIECE INTERIORLY OF SAID BORE, WHEREIN SAID THREAD-LIKE STRUCTURES ARE COMPLEMENTARY AND SAID EXTERNAL THREAD-LIKE STRUCTURE IS SWAGED INTO INTERLOCKED FRICTIONAL ENGAGEMENT WITH SAID INTERNAL THREAD-LIKE STRUCTURE SO AS SECURELY TO ANCHOR SAID FERRULE IN PLACE IN SAID BORE, SAID INTERNAL THREAD HAVING A MAJOR DIAMETER THAT IS GREATER THAN THE INITIAL DIAMETER OF SAID OPENING AND A MINOR DIAMETER THAT IS LESS THAN THE INITIAL DIAMETER OF SAID OPENING, SAID INTERNAL THREAD BEING ADAPTED TO RECEIVE AND TO ENGAGE A COOPERATING EXTERNAL THREAD CARRIED UPON THE SHANK OF A SCREW, OR THE LIKE.

Claim 2

THE METHOD OF PRODUCING A STRONG THREADED ANCHORAGE IN A WORKPIECE FORMED OF RELATIVELY SOFT METAL, COMPRISING PROVIDING A SUBSTANTIALLY CYLINDRICAL BORE IN SAID WORKPIECE, PROVIDING A FERRULE FORMED OF RELATIVELY HARD SHEET METAL CHARACTERIZED BY PLASTIC FLOW UNDER SWAGING PRESSURE AND HAVING A SUBSTANTIALLY CYLINDRICAL OPENING THEREIN, SECURING SAID FERRULE IN PLACE IN SAID BORE WITH THE EXTERIOR SURFACE OF SAID FERRULE IN FRICTIONAL ENGAGEMENT WITH THE ADJACENT SURFACE OF SAID WORKPIECE INTERIORLY OF SAID BORE AND SUBJECTING THE INTERIOR SURFACE OF SAID FERRULE TO SWAGING PRESSURE WITH AN EXTREMELY HARD THREAD-SWAGING MEMBER SO AS SIMULTANEOUSLY TO SWAGE AN INTERNAL THREAD UPON THE INTERIOR SURFACE OF SAID FERRULE AND TO SWAGE AN EXTERNAL THREAD-LIKE STRUCTURE UPON THE EXTERIOR SURFACE OF SAID FERRULE AND TO COMPRESS AN INTERNAL THREADLIKE STRUCTURE UPON SAID WORKPIECE INTERIORLY OF SAID BORE, WHEREIN SAID THREAD-LIKE STRUCTURES ARE COMPLEMENTARY AND SAID EXTERNAL THREAD-LIKE STRUCTURE IS SWAGED INTO INTERLOCKED FRICTIONAL ENGAGEMENT WITH SAID INTERNAL THREAD-LIKE STRUCTURE SO AS SECURELY TO ANCHOR SAID FERRULE IN PLACE IN SAID BORE, SAID INTERNAL THREAD HAVING A MAJOR DIAMETER THAT IS GREATER THAN THE INITIAL DIAMETER OF SAID OPENING AND A MINOR DIAMETER THAT IS LESS THAN THE INITIAL DIAMETER OF SAID OPENING, SAID INTERNAL THREAD BEING ADAPTED TO RECEIVE AND TO ENGAGE A COOPERATING EXTERNAL THREAD CARRIED UPON THE SHANK OF A SCREW, OR THE LIKE.