Abstract: A casing structure interposed between the engine and the nacelle of an aircraft, the casing structure including a shroud surrounding the engine and including a plurality of sectors; at least one radial arm providing the connection to the nacelle; and a plurality of fasteners for securing the plurality of shroud sectors to one another or to the at least one radial arm; the plurality of fasteners including a plurality of connection tabs, each provided with two parallel series of holes for receiving two respective series of headed bolts, a first series passing through a corresponding set of orifices of one shroud sector, and a second series passing through a corresponding set of orifices of an adjacent shroud sector or an adjacent radial arm.

Abstract: A cartridge includes a fluidically conductive floor element, a cover, and a film disposed between the elements. The cover or the floor element and the film include a filling opening for filling microfluidic channels in one of the elements having sample fluid. Pins engage in corresponding holes in the film and the associated element. By way of deforming a pin, a friction fit is produced with the wall of a hole, and a head contacting the associated substrate in a form-fitting manner is formed. A press tool is placed on a head end of a pin at a predetermined pressure, and heat transfer into the pin takes place during a weld time. The pin material is brought to above the glass transition temperature and/or the melting point, and a friction fit between the pin and the wall of the hole is formed by flowing the pin material in the hole.

Abstract: The invention relates to an assembly comprising first and second parts made of composite material and held against each other by at least one fastener system comprising a rivet having a flat head from which there extends a shank having an enlarged end, and a washer co-operating with the enlarged end of the shank of the rivet, the head of the rivet bearing against a countersink formed in the first part, the washer bearing against the second part. On its face remote from its face bearing against the second part, the washer presents a portion of conical shape. The washer also has a central countersink with the enlarged end of the shank of the rivet pressing thereagainst.

Abstract: The invention relates to fasteners adapted for use in automobile air bag attachment systems. The fastener comprises a hook to engage a vehicle structure during installation and a pin to lock the fastener in place. Advantageously, the hook portion may be quickly installed and will support the air bag assembly while allowing any positional adjustments to be made prior to locking the fastener by depressing the pin until it is fully engaged in the vehicle structure. An embodiment of the invention incorporates both a locking method to prevent the fastener from being disengaged and a method of releasing this lock if needed for servicing. Another aspect of the invention provides a method for reducing the likelihood of improperly installed parts by preventing locking when the fastener is in a partially installed configuration.

Abstract: Bolt element (10) having a shaft part (12) which is designed at a first end (14) for a rivet connection (16) to a panel element (18), in particular to a sheet metal part, is characterized in that the shaft part (12) has a spherical formation (22) at its other end (20) the ball diameter (D) of which is larger than that of the shaft part (12). In this manner a bolt element with a spherical head can be manufactured in an extremely favourable manner price-wise and it can be ensured that the spherical head has no burr which would lead to the wearing of the socket provided in operation which slides on the spherical head.

Abstract: A method and apparatus for applying a coating composition to a surface on at least one panel member using a fastener having the composition on its exterior. The fastener, which has a greater coefficient of thermal expansion, is fitted within the panel member, and during thermally-induced expansion, acts to facilitate diffusion of the composition into the panel surface. The coating composition is applied to the fastener via conventional methods to the fastener, and is engineered to react with the material of the panel member to form, via a diffusion process, an intermediate coating in the region of the panel member and coating materials.

Abstract: The invention relates to a rivet for joining surface treated objects. The rivet is designed for decreasing the stress and damage that may occur on the surface treated object or frame during the riveting process. The rivet includes a shaft and a head including an upper limit surface and a contact surface. The contact surface consists of an outer partial surface and an inner partial surface, the outer partial surface adjoining the inner partial surface at an intersection spaced from the shaft. The outer partial surface extends from the intersection in a direction away from the shaft and the inner partial surface. During the riveting process, the rivet deforms so that the entire contact surface contacts the surface treated object or frame.

Abstract: A biangular countersink in a skin panel to be joined to an underlying support member includes a frustoconical base portion defining a large included angle and an extremely shallow outer portion cut at a very small acute included angle. Fasteners usable with the countersink have heads with frustoconical undersides matching the deeper base portion of the countersink and rounded heads sized to fit within the shallow, acutely angled outer portion of the countersink. The combination of fastener and biangular countersink reduces annular grooves or "halos" which typically are formed around conventional flush head fasteners.

Abstract: The method of clamping together two workpiece sheets using a rivet, one sheet having a bore, and a counterbore, which is frusto-conical and tapers forwardly between a side of the one sheet and the bore, and toward the bore, and that includes providing a metallic rivet having an axially extending shank defining an axis, the rivet metal consisting essentially of fine-grained aluminum alloy; providing the rivet with a head having an end face and a forwardly tapered frusto-conical section located forwardly of the end face; installing the shank in the bore, with part of the head in the counterbore, so that the periphery of the head end face projects above the work surface, the end face formed to provide a ring-shaped dome protruding axially in an upward direction, the dome located to extend about the axis in substantially axial alignment with the outer surface of the shank, the ring dome forming a central recess; the rivet head provided with a peripheral side wall spaced radially from a side wall defined by the wo

Abstract: A rivet which has a flat crown that extends from the head of a rivet. The rivet is typically installed into a workpiece hole which has a countersink. The head has a frusto-conical section that extends from a rivet shank and a cylindrical section that extends from the frusto-conical section. The frusto-conical section sits within a countersink of the workpiece hole. Extending from a top surface of the head is a crown which has a flat end face and a tapered portion that extends from the end face to the top head surface. The crown has a diameter that is smaller than the outer diameter of the head. The flat end face is approximately 0.5 times the diameter of the shank. The crown has a diameter that is approximately 1.25 times the shank diameter. The rivet is deformed by a hammer and an anvil so that the crown becomes flat and the rivet fills the hole of the workpiece.

Abstract: A composite fastener, preferably in the form of a rivet, which comprises a shank having a first head integrally formed on one end thereof, the shank and head formed of a high temperature thermoplastic matrix material selected from the group consisting of a polyether ether ketone resin and a polyamide imide resin, and having continuous reinforcing fibers, such as graphite fibers, axially oriented in substantially parallel relation throughout the shank, the fibers being flared and extending continuously into the head and substantially evenly flared and swaged therein, thereby forming a fastener having high shear and high tensile characteristics.

Abstract: A flush rivet is configured for joining first and second overlapping structural members together, wherein the structural members define a bore comprising a cylindrical main bore, a cylindrical counterbore and a frustoconical intermediate bore between the counterbore and the main bore. The rivet includes a cylindrical shank dimensioned to be received the main bore, and having a distal end formed as a tail portion that projects distally from the main bore. The proximal end of the shank terminates in a head that includes a cylindrical section having a diameter that is slightly less than the diameter of the cylindrical counterbore, and a frustoconical section, between the shank and the cylindrical section, configured to seat in the intermediate bore. An end face on the proximal end of the head includes a central region having a first radius of curvature that is between 9 and 25 times the shank diameter, and a peripheral region having a second radius of curvature that is less than the first radius of curvature.

Abstract: An expandable head rivet for sealing applications and the like having improved inspectability after setting. The rivet has an axially extending shank, a first substantially cylindrical section and a second tapered section between the first section and the shank, all generally conforming to the hole and counterbores in the workpiece. The face of the rivet head has a raised central section having a substantially flat surface perpendicular to the axis of the rivet of a cross sectional area between 50 and 110% of the cross sectional area of the shank of the rivet. Upon setting of the rivet in the workpiece, the head end of the rivet is flattened and radially expanded to tightly engage the cylindrical counterbore.

Abstract: A workpiece having a bore, and a counterbore which is frusto-conical and tapers forwardly between a side of the workpiece and the bore, and toward the bore, a metallic rivet having an axially extending shank received in the workpiece bore and defining an axis; the rivet including a head having an end face and a forwardly tapered frusto-conical section located forwardly of the end face; the periphery of the head end face being substantially flush with the work surface, the end face forming a dome protruding axially in a rearward direction, the dome being generally ring-shaped and extending about the axis in substantially axial alignment with the outer surface of the shank; the rivet head having a peripheral side wall spaced radially from a side wall defined by the workpiece counterbore, and the space between the side walls having a volume A; the dome having a metallic volume B; and wherein the volume B exceeds volume A, such that when the dome is flattened during rivet deformation, the rivet head side wall is

Abstract: The invention relates to a fastener member for the production of assemblies, in particular a rivet. This fastener means includes a shank (1) and a head (2) intended to be deformed by flattening during installation. On its front face, this head has an annular groove (5) extending around the axis and positioned in proximity to the alignment of the exterior surface of the shank. This groove defines on the head two portions, one central (2C), the other peripheral (2P), able to be deformed independently under the effect of flattening. The invention enables a considerable improvement of the distribution of compressive forces between the fastener means and the materials to be assembled. It assures a satisfactory radial expansion of the head, as well as a sufficient flow of material toward the shank and the junction zone between shank and head.

Abstract: An expandable head rivet for sealing applications and the like having improved inspectability after setting. The rivet has an axially extending shank, a first substantially cylindrical section and a second tapered section between the first section and the shank, all generally conforming to the hole and counterbores in the workpiece. The face of the rivet head has a raised central section having a substantially flat surface perpendicular to the axis of the rivet of a cross sectional area of at least a substantial percentage of the cross sectional area of the shank of the rivet. Upon setting of the rivet in the workpiece, the head end of the rivet is flattened and radially expanded to tightly engage the cylindrical counterbore.

Abstract: A rivet for pivotally interconnecting first and second superposed links each having an opening therethrough, including a first head having a link engaging surface and an outer concave surface, and a shank having first and second portions with a shoulder therebetween, with the first portion being adjacent the head and receivable in the first link opening and the second portion being receivable in the second link opening. During assembly, the rivet is compressed so that the second portion is deformed to form a second head to secure the links between the first and second heads, and the first head is deformed to reduce the concavity of the recess therein and axially shift the first link over the first shank portion to virtually eliminate axial free play.

Abstract: The invention is a tapered tail rivet for joining two or more structural elements together which, during driving, provides a controlled expansion of the hole and, after driving, leaves residul hoop compression stresses around the hole. The tapered tail rivet has a shank having a nominal diameter (the diameter in the middle of the tolerance range). The head diameter may be of the type critically dimensioned based on the shank diameter or other design parameter. The tapered tail length is between 1.30 times the minimum shank diameter and 1.10 times the maximum shank diameter. The distal end of the tapered tail has a diameter of between 0.80 times the minimum shank diameter and 0.68 times the maximum shank diameter. The tapered tail portion should extend to the face of one of the structural elements to just inside the face of that structural element prior to driving. The minimum upset tail diameter should be 1.45 times the nominal shank diameter and the minimum upset tail height should be 0.

Abstract: The invention is a protruding-head rivet for joining two or more structural elements together which, when driven, using all standard driving tools, provide a controlled expansion of the hole. The protruding-head rivet 10 has a shank 12 having a nominal diameter 18. The head diameter 24 is between 1.642 times the minimum shank diameter 18 and 1.706 times the maximum shank diameter. The head has a center spherical radius 26 of between 1.320 times the minimum shank diameter and 1.406 times the maximum shank diameter and a head outer spherical radius 30 of between 0.321 times the minimum shank diameter 18 and 0.353 times the maximum shank diameter. The underhead surface downward directed angle 36 is between 5 and 6 degrees. The head height 22 is between 0.455 times the minimum shank diameter 18 and 0.479 times the maximum shank diameter.The radius 38 between the protruding head and the shank is between 0.050 times the minimum shank diameter and 0.

Abstract: A die particularly adapted to drive a rivet, where the head of the rivet has a relatively steep circumferential side surface. The die engages the rivet head in a manner that initially the middle portion of the die driving surface exerts substantial force into the shank portion of the rivet, after which the die driving surface comes in greater overall driving engagement with the entire rivet head. Further, the die has a circumferential lip which limits lateral movement of the die relative to the rivet head.

Abstract: A two piece flush type fastener is provided with an improved head structure which includes a raised dish compensating portion on the outer end thereof the height of which is proportioned relative to anticipated peak installation loads, nominal pin diameter and material shear strength such that upon setting of the fastener the head will controllably yield so as to provide a substantially flat head surface on the installed fastener and eliminate the reduction in head strength which may accompany excessive dishing of the head outer surface. The dish compensating raised surface portion on the head also enables formation of a higher tensile strength joint having improved fatigue performance for a given size head.