METHOD AND APPARATUS FOR PULL-THROUGH BLIND INSTALLATION OF A TUBULAR MEMBER

摘要

Apparatus for the pull-through blind installation of a headless tubular ferrule (12) in a hole (13) in a workpiece (14) at a position therealong spaced from the nearer face (22) of the workpiece (14), comprises an annular anvil (34) for supporting the ferrule inside the workpiece hole (13); anvil supporting means for initially supporting the anvil (34) at a position inside the workpiece hole (13); a mandrel having a stem (31) extending through the anvil aperture, and an enlarged head (36); pneumattically-operated retraction means for retracting the mandrel stem (31) through the anvil aperture thereby to draw the mandrel head (36) into the adjacent part of the bore (39) of the ferrule whilst the ferrule (12) is supported inside the workpiece hole (13) by the annular anvil (34), thereby to enlarge the part of the ferrule (12) more remote from the anvil into engagement with the workpiece (14); and pneumatically-operated withdrawal means for withdrawing the anvil away from the ferrule (12) to allow the mandrel head (36) to be withdrawn completely through the remainder of the bore of the ferrule (12), to complete installation of the ferrule (12).