Patent ID: 6213699
Filing Date: 2001-04-10
Classification: F16B

Abstract:
A blind fastener for securing a plurality of workpieces having aligned workpiece bores comprising:a hollow sleeve having a through bore,said sleeve having a sleeve shank and an enlarged sleeve head at one end with said sleeve shank adapted to be located in the workpiece bores with a predetermined clearance,a pin,said pin having a pin shank and an enlarged pin head, said pin shank adapted to be located within said bore of said sleeve with said pin head located at the end of said sleeve shank opposite said sleeve head,said through bore of said sleeve having an expansion bore portion in said sleeve shank and a reduced diameter bore portion proximate thereto and defining a radially inwardly extending sleeve stop shoulder at the juncture of said enlarged and reduced bore portions,said reduced diameter bore portion located generally in said sleeve head,said pin shank having an increased diameter expander pin portion having a diameter greater than the diameter of said expansion bore portion to provide a preselected interference,said pin having a pin stop shoulder portion adjacent said expander pin portion,a lock groove located proximate said pin stop shoulder,said pin head adapted to engage said sleeve shank portion and to deform the same to form a blind head opposite said sleeve head in response to a relative axial force applied between said pin and said sleeve,said pin stop shoulder adapted to engage said sleeve stop shoulder,said pin stop shoulder and said sleeve stop shoulder having engaging surface means for directing the material of said sleeve stop shoulder substantially radially inwardly into said lock groove to lock said pin and said sleeve together and to finally form a stop surface on said sleeve for stopping axial movement of said pin through said sleeve,said expander pin portion having a grooved section with a plurality of axially extending relief grooves circumferentially separated by expander segments, said expander segments defining a generally uniform circular outer surface, said expander segments and said relief grooves being generally of the same circumferential width, said expander pin portion adapted to be moved into said expansion bore portion to expand it radially outwardly to fill the clearance between said sleeve shank and the workpiece bores with said relief grooves receiving excess material of said expansion bore portion after filling of the workpiece bores.