COMPOSITE BUCKLING BLIND FASTENER

摘要

This invention relates to blind fasteners and more particularly to blind fasteners having a large bearing surface on the blind side of the structure on which it is mounted. Prior art fasteners either tend to damage the material on which they are mounted, have too small of a blind side bearing surface, or are too long to be used in certain applications. The fastener of the present invention has a nut (21) with an axial bore (23) therethrough, a conically shaped nose (24) at one end and an enlarged head (26) at the other end. Extending through said nut is a bolt (30) having a stem (31) and an enlarged head (32) adjacent to said nut nose (24). Between said nut nose and said bolt head is a sleeve (40) on said bolt stem. The improvement of the present invention comprises said sleeve having a thick wall (41) section adjacent to said bolt head and a thin wall section (42) adjacent to said nut nose and a collar (50) which engages said sleeve and which has a tensile strength very much less than the tensile strength of said sleeve.