FASTENER WITH STAGED LOCKING SYSTEM

摘要

A fastener (10) includes a pin (12) and a collar (14) for engaging the pin (12). The pin (12) includes a pin head (16) for engaging one exposed surface of the workpieces and a pin shank (18) for positioning through a bore (100) in the workpieces (102). The pin shank (18) includes a second working edge (24), a second locking groove (26), a first working edge (30), a first locking groove (32), a breakneck groove (36) and a pin tail (38) having a plurality of pulling grooves (40). The collar (14) includes an enlarged head (42) and a through bore (46). The collar (14) is placed over the pin shank (18) and an installation tool is used to grip the pulling grooves (40). The installation tool forces and presses the collar (14) onto the pin (12). As this happens, the first working edge (30) engages the through bore (46) of the collar (14) and moves material from the through bore (46) into the first locking groove (32) to create a lock between the collar (14) and the pin (12). Continued movement of the collar (14) with respect to the pin (12) engages the second working edge (24) with the through bore (46) of the collar (14) and moves material from the through bore (46) into the second locking groove (26) to create an additional lock between the collar (14) and the pin (12).