Patent ID: 8387226
Filing Date: 2013-03-05
Classification: B21J,Y10T

Abstract:
1. A method for removing a blind fastener from a structure, the method comprising: locating about a center of the blind fastener and a core bolt, wherein the fastener has a head and a body, and wherein the core bolt has a core bolt head and core bolt shaft, and wherein the core bolt shaft is located inside the body of the fastener and the bolt head is located on a same side as the head of the fastener; creating a guide at about the center of the core bolt head; drilling a first hole in the guide of the core bolt head in the body of the blind fastener to form a pilot hole to a first depth into the core bolt head; thereafter drilling a second hole through the pilot hole, to about the first depth or when the core bolt head snaps off, whichever happens first; responsive to the core bolt head failing to snap off when drilling the second hole through the pilot hole, separating the core bolt head from the core bolt shaft using a second tool different than a first tool used to drill the second hole; applying sufficient force to remove the core bolt shaft from the body of the fastener; separating the fastener head from the body of the fastener by drilling a counter bore into the body of the fastener to a predetermined depth; and; moving the fastener body out of the structure.