Patent ID: 7971508

Claim:
A device to extract a fastener from a workpiece wherein the fastener has a predetermined direction of insertion into the workpiece, the device comprising: a shaft having first end and second end portions, said first end portion adapted to be received by a tool for imparting torque contrary to the fastener's direction of engagement, said tool providing rotary motion sufficient to bore a recess in the fastener, said second end portion terminated in a cutting tool adapted to engage the fastener as said shaft is rotated, said shaft rotation being contrary to the fastener's direction of engagement; a drill-bit proximal to the cutting tool and adapted to engage and bore into the fastener as said shaft is rotated; a socket having a rim, longitudinally extending slits, an outer surface with a threaded section and an adjustable inner diameter, wherein a height of the thread's protrusion above the outer surface increases the closer the thread is to the rim of the socket, wherein said socket is joined to said shaft such that rotary motion is transferred from said shaft to said socket; a collar collet disposed on the threaded section of the socket wherein upon a rotation of the collar collet the adjustable inner diameter of the socket is altered via said thread's protrusion and said slits; and cutting threads disposed upon said shaft between said socket and said drill-bit such that said cutting threads penetrate, via rotary motion imparted upon said socket, a recess wall formed in the fastener by said drill-bit, said cutting threads penetrating said recess wall a predetermined distance to form and be secured to corresponding threads cut by said cutting threads in said recess wall, while said cutting tool bores into the fastener pursuant to the rotary motion imparted upon said socket until said socket engages the workpiece, whereby said cutting threads secure said shaft to the fastener and promote the removal of the fastener from the workpiece when the socket engages the workpiece and the rotation of said shaft is contrary to the fastener's insertion direction into the workpiece.