초록 ▼

A self-boring fastener comprising an elongated cylindrical element which intersects a driving means, said cylindrical element having a knife edge means axially projecting from the periphery of the extreme end thereof so as to extend beyond said end, and a thin knife edge element continuously, helica

A self-boring fastener comprising an elongated cylindrical element which intersects a driving means, said cylindrical element having a knife edge means axially projecting from the periphery of the extreme end thereof so as to extend beyond said end, and a thin knife edge element continuously, helically positioned about the outer periphery of said cylindrical element, said knife thread extending outwardly laterally from the outer periphery of said cylindrical element, said cylindrical element having an axial hole extending inwardly from the extreme end thereof so as to form an internal cavity in said cylindrical element. The method of fastening rubber, wood and other non-metallic materials either together or to base materials without the necessity of preformed bores or embedded metal mating parts and without incuring the problems of misalignment by use of the self-boring fastener.

대표청구항 ▼

A self-boring fastener for installation in a boreless workpiece, comprising in combination; a workpiece composed of wood, rubber or synthetic plastic materials, and an elongated cylindrical element mounted within said workpiece, said cylindrical element having at least one end thereof provided with

A self-boring fastener for installation in a boreless workpiece, comprising in combination; a workpiece composed of wood, rubber or synthetic plastic materials, and an elongated cylindrical element mounted within said workpiece, said cylindrical element having at least one end thereof provided with an axial cavity so as to form a continuous curcumferential wall member having an opened end and an oppositely disposed closed end wherein a compression chamber is defined by said axial cavity; said wall member being provided with a longitudinally extending knife edge at the open extremity thereof; said elongated cylindrical element being provided with a thin knife-edge element helically positioned about the outer periphery of said cylindrical element; driving means carried by said cylindrical element to rotatably embed the fastener in a workpiece; and a compressed core of workpiece material within said compression chamber.