F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
85/17
F16B 13/06 (2006.01) F16B 19/10 (2006.01) F16B 39/30 (2006.01)
Patent
CA 1135087
Title of the invention: "A BLIND FASTENER" ABSTRACT OF THE DISCLOSURE A three piece blind fastener comprising an externally threaded, headed, bolt having a breakneck for limiting the torque transmissible therethrough; a tubular nut having an elongate shank, a head and an internal thread complementary to that of the bolt; and a tubular sleeve which, by relatively turning the bole in threaded engagement with the nut, can be forced on to the shank of the nut and expanded thereby to form a blind head, has the complementary threads of both the nut and bolt modified for frictional self locking interengagement. The bolt thread is modified by the provision of a cylindrical locking zone between the ends of the bolt thread, which zone has a diameter intermediate between the diameters of the crests of the threads of the bolt and the nut, and the thread of the nut is reamed to provide a truly cylindrical crest surface of smaller diameter than the locking zone of the bolt to give a controlled interference between the locking zone of the bolt and the nut thread which serves to lock the nut and bolt together. P.261
341448
Aerpat A.g.
Ridout & Maybee Llp
LandOfFree
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