Self-locking screws

Abstract

Abstract SELF-LOCKING SCREWS WHEREIN THE SELF-LOCKING RESULT IS ACHIEVED BY FORMING ONE OR MORE OUTWARDLY TURNED RIBS, CONTINUOUS OR DISCONTINUOUS, IN THE FLANK OR FLANKS OF ONE OR MORE TURNS OF THE THREADS OVER A SELECTED LENGTH OF THE SCREW. THE SCREW THREADS AND RIBS THEREIN MAY BE MADE BY THE USE OF CONVENTIONAL THREAD ROLLING DIES (FLAT OR CIRCULAR) IN WHICH CERTAIN SELECTED THREADS IN ONE OF THE DIES (PREFERABLY THE MOVABLE DIE), OVER A SUITABLE LENGTH HAVE BEEN DEFORMED IN A PARTICULAR MANNER. THE DEFORMED DIE THREADS MUST BE LOCATED AT A PROPER DISTANCE FROM THE END OF THE DIE SO THAT THE SELF-LOCKING RIBS FORMED IN THE THREADS OF THE SCREW WILL NOT BE SUBSEQUENTLY WIPED OUT BY ENCOUNTER WITH THE UNDEFORMED THREADS IN THE OTHER DIE. PREFERABLY, HOWEVER, THE RIBS SHOULD HAVE THE LEADING AND TRAILING ENDS THEREOF FAIRED BACK INTO THE FLANK OF THE SCREW THREAD SUFFICIENTLY TO FACILITATE ENTRY INTO AND REMOVAL FROM THE INTERAL THREAD.

Inventors

No inventors recorded.

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