Patent ID: 6537005
Filing Date: 2003-03-25
Classification: F16B

Abstract:
A blind fastener for insertion through an aperture in a workpiece, the fastener comprising a pin, a sleeve and an abutment member;the pin extending inside the sleeve and engaging therewith at or near a first end of the sleeve; the other end of the sleeve having a radially enlarged head; the sleeve being in one piece and having a radially expandable portion adjacent the first end; the abutment member being adjacent the head of the sleeve and projecting radially beyond the head and the pin extending beyond the abutment member; the head of the sleeve being provided with a frangible element against which the abutment member abuts; whereby, when the sleeve is inserted into a suitable aperture in a workpiece of suitable thickness with the expandable portion of the sleeve protruding beyond the blind or remote face of the workpiece and the head of the sleeve abutting the near face of the workpiece, with the abutment member abutting the frangible element of the sleeve head, the abutment member is thereby spaced away from the near face of the workpiece; so that, when a progressively increasing pulling force is applied to the part of the pin extending beyond the abutment member, the pulling force being supported against the abutment member, so that axial compression is applied to the sleeve between the head and its engagement with the pin, initially the frangible element supports sufficient force to allow the radially expandable part of the sleeve to radially expand to begin to form a blind head in abutment with the remote face of the workpiece; and thereafter the frangible element breaks thereby to remove axial compression from the sleeve, and allows the abutment member to move along the pin to come into abutment with the near face of the workpiece, thereby to apply compression to the workpiece between the blind head and the abutment member; and thereafter the abutment member can be secured to the pin.