HOLE FILLING RIVET WITH HIGH PIN LOCK

摘要

A two piece blind fastener (10) for securing a plurality of workpieces (16, 18) including a hollow sleeve (12) having a straight shank (20) with an enlarged sleeve head (22) at one end and a pin (14) having an enlarged pin head (38); the pin (14) has a pin stop shoulder (52) and a lock groove (54) located near the pin stop shoulder (52); the pin head (38) is adapted to engage the sleeve (12) to form a bulb type blind head (37) in response to a relative axial force applied between the pin (14) and sleeve (12); the pin stop shoulder (52) is adapted to engage a sleeve stop shoulder (34) to direc t the material of the sleeve stop shoulder (34) substantially radially inwardl y into the lock groove (54) to lock the pin (14) and sleeve (12) together and to finally form a stop surface on the sleeve (12) for stopping axial movement o f the pin (14) through the sleeve (12); in addition the pin (14) has an expand er portion (46) adapted to expand the sleeve shank (20) radially outwardly to fill the openings (24, 26) of the workpieces (16, 18) and with the expander portion (46) having a grooved section (62) with alternate relief grooves (70 ) and expander segments (72) with the relief grooves (70) receiving excess material of the sleeve (12) after hole fill and to thereby also assist in locking the pin (14) and sleeve (12) together.