| 摘要 |
A device for the extraction of broken fastener comprises a left handed cutting tool juxtaposed to a left handed drill bit that is surrounded by a socket. In a specific embodiment the socket has longitudinal slits, a ribbed inner surface, and a threaded outside surface adapted to be received by a collar. An alternative device 100 to extract a fastener 102 from a workpiece 104 wherein the fastener 102 has a predetermined direction of engagement with the workpiece 104 includes a shaft 106 having first and second end portions 108 and 110, cutting end tool 112 adapted to engage and bore into the fastener 102 as the shaft 106 is rotated, a drill bit portion 114 proximal to the cutting end tool 112 and adapted to engage and bore into the fastener 102, cutting threads 116 that penetrate the fastener 102 a predetermined distance while the drill bit portion 114 bores into the fastener 102 whereby the cutting threads 116 secure the device 100 to the fastener 102 and promote the rotation of the fastener 102 contrary to the fastener's 102 direction of rotational engagement to ultimately remove the fastener 102 from the workpiece 104.
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