| abstract |
A retractable and reusable self-locking fastening device in the form of a commercially available rivet, pin, threaded bolt or stud and the like for insertion into a sized clearance hole in a workpiece includes a shank means having tenon and pilot means which comprises two successive steps of lesser diameter formed on at least one end of the shank means. Mounted on and fixedly connected to the pilot means is a lug means having a generally truncated conical shape with one closed end and the end remote therefrom being opened to define a space in which the tenon means is disposed, and a sized aperture in the closed end to enable the lug means to be fixedly connected to the pilot means. The tapered walls of the lug means have at least four outwardly extending movable sections separated by at least four longitudinal slots defining a truncated cone configuration. The lug means is made from any suitable material which possesses sufficient resiliency to permit the movable sections to be compressed during insertion of the fastener into the sized clearance hole in the workpiece to be secured or fastened. The retractable and reusable self-locking fastener as above described may be threaded inwardly of the tenon means and pilot means, and provides a nut means which is operative to secure a workpiece or workpieces against a fixed shoulder and lug means to prevent said nut means from turning off said fastener. |