![]() ![]() When the pulling force of the rivet gun forces the blind head upward into the sleeve, its stem upsets or expands the lower end of the sleeve into a tail. This portion contains a tapered joining portion and a blind head that has a larger diameter than the stem or the sleeve of the tubular rivet. The lower end of the stem extends beyond the inner sheet of metal. Inserted within the rivet’s core is a stem that is enlarged or serrated on its exposed end when activated by a pulling-type rivet gun. The past decades have seen a proliferation of blind fastening systems based on the original concept, which consists of a tubular rivet with a fixed head and a hollow sleeve. NOTE: For metal repairs to the airframe, the use of blind rivets must be specifically authorized by the airframe manufacturer or approved by a representative of the Federal Aviation Administration (FAA).īlind RivetsThe first blind fasteners were introduced in 1940 by the Cherry Rivet Company (now Cherry® Aerospace), and the aviation industry quickly adopted them. On aircraft control surfaces, hinges, hinge brackets, flight control actuating systems, wing attachment fittings, landing gear fittings, on floats or amphibian hulls below the water level, or other heavily stressed locations on the aircraft.On aircraft in air intake areas where rivet parts may be ingested by the engine.Therefore, blind rivets are usually not used when driven rivets can be installed. ![]() Typically, the locking characteristics of a blind rivet are not as good as a driven rivet. Although the shear loads of riveted joints are very good, the tension, or clamp-up, loads are less than ideal. There are also areas of high loads, high fatigue, and bending on aircraft. In these instances, it is not possible to use solid shank rivets, and special fasteners have been designed that can be bucked from the front. There are many places on an aircraft where this access is impossible or where limited space does not permit the use of a bucking bar. ![]() To install solid shank rivets, the aircraft technician must have access to both sides of a riveted structure or structural part. For example, the attachment of many nonstructural parts (aircraft interior furnishings, flooring, deicing boots, etc.) do not need the full strength of solid shank rivets. Solid shank rivets have been the preferred construction method for metal aircraft for many years because they fill up the hole, which results in good load transfer, but they are not always ideal. Special purpose fasteners are designed for applications in which fastener strength, ease of installation, or temperature properties of the fastener require consideration. ![]()
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