F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
85/18
F16B 31/02 (2006.01)
Patent
CA 1120293
BLIND FASTENER WARREN F. DAHL AND RICHARD C. LANDT ABSTRACT OF THE DISCLOSURE A blind fastener assembly included, in one embodiment a pin, an expander and a sleeve. The pin and expander may in- clude, in one configuration, mating threads for drawing the sleeve axially over the expander toward the blind side of a work- piece, or the pin may be a pull-type wherein the portion of the pin opposite from the blind side end has pull grooves which are adapted to be gripped by a conventional pull gun. The sleeve is a tubular member with a portion of its length having a normal radial thickness and a portion having reduced radial thickness comprising a reduced outer diameter over a portion of its axial length and a counter-bore along the same axial length adjacent one end of the sleeve. The expander extends through aligned holes in the workpieces and has a tapered nose surface proximate the reduced thickness portion of the sleeve. When an axial force is exerted on the pin, the reduced thickness portion of the sleeve is forced over the tapered nose surface on the expand- er toward the blind side of the workpiece and is expanded in diameter. The tapered surface of the expander also deforms and - 1 - expands the inner diameter of the normal thickness portion of the sleeve where it meets the counter-bore, and when the leading edge of the sleeve contacts the blindside workpiece surface, an optimum shaped, maximum diameter bulb forms in the reduced thick- ness portion of the sleeve against the blindside workpiece sur- face. When the bulb is fully formed, a reduced diameter break- neck portion of the pin fractures at a predetermined torque or load, leaving a properly tensioned joint. In another embodiment of the invention, the blind fast- ener comprises a pin and an integral sleeve/expander combina- tion which is designed to fracture at the expander/sleeve inter- face and form an optimum diameter bulb upon axial movement of the pin. The formed bulb advances along a tapered nose portion of the expander and bears against the blind side of the work- piece clamping the joint together. In yet another embodiment of the invention, a grip accom- modating feature is provided by a second varying reduced thick- ness portion in the sleeve, located in the normal thickness por- tion between the first reduced thickness portion and the blind- side end of the sleeve adjacent a pulling head on the pin. Once the bulb is optimally formed and bears against the blind side of the workpiece, additional axial force exerted on the pin causes a second outwardly bulbed portion to form on the sleeve at the sec- ond reduced thickness portion to accommodate variations in work- piece thickness in the joint. The diameter of the second bulb is - 2 - dependent on the overall joint thickness, with a larger diameter bulb forming for a maximum joint thickness and a smaller diameter bulb being formed for a minimum joint thickness.
367986
Dahl Warren F.
Landt Richard C.
Gowling Lafleur Henderson Llp
Sps Technologies Inc.
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