Emhart Inc.

Donald W Armstrong

Daniel Robin Smith

A blind fastener system comprises (a) an outer sleeve (2) comprising a flange (4) at one end, which sleeve (2) is provided with a counterbore (9) at the end adjacent to the flange (4), and a relatively thin wall section (8) which extends from the flange (4) and terminates in an abutment surface (12) and; (b) an inner sleeve (14) having an inner threaded bore (20), which inner sleeve (14) comprises a head portion (16) which terminates in a shoulder (22) and a second portion (18) extending from the head portion (16) towards the operating side (24) of the fastener (10) and having a relatively thin wall (28), which second portion (18) has a shape which matches the shape of the inner bore of the outer sleeve (2). The inner and outer sleeves (2,14) are adapted to be assembled together so that the abutment surface (12) of the outer sleeve (2) abuts against the shoulder (22) of the inner sleeve (14). The flange (4) of the outer sleeve (2) has a plain outer diameter, and sleeve portion (23) having a cross-section which is of such a shape that the outer sleeve (2) is restrained from rotation relative to the workpiece (38) in which it is mounted, is provided between the flange (4) and the relatively thin walled section (8). The second portion (18) of the inner sleeve (14) is provided on its outer face (32) with a profile (30,40) which engages with the inner face (34) of the wall of the flanged portion (4) of the outer sleeve (2) when the fastener (10) has been set.

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West Midlands, United Kingdom

Donald W Armstrong