Wood fastener

Claim 1

A THREADED FASTENER COMPRISING A HOLLOW BODY PORTION BEING THREADED AT ONE END PORTION THEREOF AND HAVA CIRCULAR TRANSVERSE CROSS-SECTION WITH A SUBSTANTIALLY SMOOTH EXTERNAL SURFACE THROUGH THE LENGTH THEREOF, A HEAD PORTION EXTENDED RADIALLY OUTWARDLY FROM THE LONGITUDINAL AXIS OF SAID BODY PORTION ADJACENT THE OPPOSITE END THEREOF, SAID HEAD PORTION HAVING AN ANNULAR SURFACE FACING TOWARD SAID BODY PORTION AND DISPOSED SUBSTANTIALLY IN A PLANE EXTENDING AT RIGHT ANGLES TO SAID LONGITUDINAL AXIS, SAID ANNULAR SURFACE EXTENDING FROM THE PERIPHERY OF SAID HEAD PORTION TO ADJACENT SAID BODY PORTION, THE OTHER SURFACE OF SAID HEAD PORTION OPPOSITE SAID ANNULAR SURFACE AND SAID BODY PORTION ADJACENT THERETO HAVING A WRENCH OPENING CENTRALLY DISPOSED THEREIN AND BEING ROUNDED FROM THE PERIPHERY OF SAID HEAD PORTION TOWARD SAID OPENING, SAID BODY PORTION ADJACENT THE OTHER END PORTION THEREOF BEING PROGRESSIVELY FLARED OUTWARDLY FROM SAID LONGITUDINAL AXIS THEREOF TO BLEND INTO SAID ANNULAR SURFACE OF SAID HEAD PORTION, SAID ANNULAR SURFACE HAVING ELONGATED TEETH PROJECTING THEREFROM, THE LENGTH OF SAID TEETH EXTENDING RADIALLY ACROSS SAID ANNULAR SURFACE, AT LEAST SOME OF SAID TEETH EXTENDING BEYOND SAID ANNULAR SURFACE TO SAID FLARED BODY PORTION ADJACENT THERETO, SAID TEETH BEING ADAPTED TO COUNTERSINK AND SUBSEQUENTLY ENGAGE THE SURFACE ADJACENT TO AN OPENING IN WHICH THE FASTENER IS INSERTED.