Abstract: A system for producing a first and second series of blind fasteners each in uniformly varying grip increments for securing workpieces varying in total thickness, each blind fastener comprising a tubular sleeve, a pin and lock collar, the sleeve adapted to be located in aligned openings in the workpieces with the fastener adapted to secure the plurality of workpieces together by means of a relative axial force applied between the pin and the sleeve, the sleeve having a relatively straight sleeve shank terminating at one end in an enlarged sleeve head, the first series sleeve heads being of the flush head type and the second series sleeve heads being of the protruding head type having a generally streamlined low profile configuration, each of the first series of sleeves being related to each of said second series of sleeves of the next largest grip increment such that the overall lengths of the first series of said sleeves and the related ones of the second series of sleeves are substantially the same, the pins

Abstract: A metal blind rivet assembly having a plurality of ribs with flutes between them located about the circumference of the barrel of the rivet sleeve. The ribs are arranged in a helix and at an angle so that during the setting operation a twisting motion takes place to scrape the workpiece so that contaminants such as dirt or varnish are removed to provide electrical contact with the workpiece.

Abstract: A self-plugging blind fastener of the break-stem type, is suitable for fastening apertured sheets together, and comprises a headed tubular body and an elongate stem disposed in the bore of the body. The stem comprises a plug, and a stem-tail connected to the plug by a breakneck which is concealed by overlapping lips. The plug has a stop face, and an annular locking groove between the breakneck and the stop face. The body has a deformable locking collar upstanding above an adjacent region of the upper surface of the head. The diameter of the bore reduces, to provide a stop face and a locking region of smaller diameter, within the head. The fastener is set by pulling the plug into the bore until the stop faces meet, to form a blind head, and then deforming the collar to force the body to bulge into the locking groove of the plug.

Abstract: In a blind fastener (20) of the kind comprising a tubular nut (22) having shank (28) with a head (30) at one end and a tapered nose (32) at the other end, a headed bolt (24) threadedly engaged in the bore (34) of the nut (22), and an expansible sleeve (26) which, by rotating the bolt (24), can be forced on to the nose (32) to form a blind head, a section of the shank (28) of the nut (22) is formed with a single protuberance (42) which protrudes resiliently into the bore (34) sufficiently to interfere with and restrain rotation of the bolt in the nut, and thus render the fastener self-locking. The shank (28) may have more than one section provided with a single such protuberance (42), the effect of several protuberances being additive. Each protuberance (42) lies entirely within a minor sector of its section of the shank, and presents either a flat or a curved threaded surface traversed by the thread (38). Protuberances may be in different sectors if spaced longitudinally of the shank.

Abstract: A blind fastener of the type having a fastener body, a threaded stem and a sleeve is provided with a deformable drive nut in abutting contact with the fastener body to provide a positive mechanical engagement between the abutting surfaces of the two elements. The underside of the drive nut has an annular ridge made of a deformable material adapted to deform into indentations in the outer surface of the fastener body. The positive mechanical engagement between the two elements minimizes the build-up of tensile load applied to the stem during setting of the fastener.

Abstract: A tubular fastener has an axially extending tubular shank receivable in a work bore, and an annular head receivable in forcible engagement with the work material forming a counterbore, and the fastener is further characterized by:(a) the head having an annular end face, a first section located forwardly of the end face and having an outer annular surface to be urged in a radially outward direction to forcibly engage the work counterbore, and a second forwardly tapered section located forwardly of the first section,(b) a pin extending within the tubular shank, and a stem connected to the pin and extending endwise therefrom and from the tubular fastener,(c) structure responsive to displacement of the pin toward the head end of the fastener to expand the fastener shank at the opposite end of the fastener and axially retain the fastener in position with the head first section forcibly engaging the counterbore.

Abstract: A two-piece molded plastic fastener comprises a hollow body and a pin insertable thereinto. The body has a head and a bore defined by a resiliently deformable grooved bore wall. The pin has a pin head and a serrated pin shank. When fully installed in an aperture in a workpiece (which comprises one or more panels), the serrated pin shank is frictionally engaged with and digs into the resilient grooved bore wall (i.e., is "set"), and the two heads bear against opposite sides of the workpiece. Depending on fastener design, the heads either apply a predetermined pressure on the workpiece (depending on the setting force) or are maintained at a predetermined distance from each other when set. Either the body or pin or both may embody features (such as holes, screw threads, hooks, snap fasteners) which enable objects to be secured thereto. In addition, the pin may have an axial bore therethrough to enable the fastener to serve as a bushing.

Abstract: A blind fastener comprising:a nut with an axial bore therethrough, a bolt extending through the nut with a sleeve encircling the bolt between the head of the bolt and the nut body, and a stop ring provided on a screw threaded portion of the bolt, the bolt having a break groove therein, between the nut body and the bolt head. As the bolt is advanced upwardly during installation, the stop ring abuts the terminal end of the nut body. This sudden resistance to further travel causes the screw threaded portion to fracture at the break groove thus providing a clean break at the break groove substantially filling a cavity in the nut head thereby increasing the strength of the installed fastener and eliminating any need for shaving off the broken-off screw threaded portion.

Abstract: A rivet having a head portion and a body portion, with a bore through the head portion and body portion, said bore being capable of receiving a mandrel having a head portion with a self-piercing end portion and a cutting portion. The self-piercing end portion is capable of piercing partially or entirely through a roofing substrate. After the mandrel has pierced the substrate, the cutting portion of the mandrel peels back the rivet body into separate portions which curl back on the rivet body.

Abstract: A fastener system for securing workpieces together including a blind fastener located in aligned bores and when installed providing a preselected interference fit with the bores, the fastener including a pin and a sleeve with the pin having a shank with a sizing portion and expansion portion, the sleeve having a shank portion adapted to be pre-assembled onto the sizing portion and, while pre-assembled, having its outer surface reduced in diameter to a preselected magnitude such as to provide the desired interference with the bores when the expansion portion is moved therethrough.

Abstract: A three piece blind fastener of the kind comprising a tubular nut having a head at one end and a tapered nose at the other end, an expansible sleeve, and a headed bolt threadedly engaged with the nut for forcing the sleeve on to the nose of the nut to form a blind head, has the thread of the nut provided with a locking zone in which the bore of the nut is constricted and, in cross sectional shape, a closed non-reentrant non-circular curve so that the nut resiliently interferes with the bolt.A die, and a method of providing the nut with the locking zone by means of the die are disclosed. The die has a tapered aperture having a cross sectional shape corresponding to the desired shape of the locking zone, and the method involves forcing the tapered nose of the nut into the aperture so as to constrict the bore, in a zone spaced from its ends, to the desired extent and impose the non-circular cross sectional shape on the constricted zone.

Abstract: A blind fastener of the type wherein a cylindrical stem or mandrel pulled within a tubular sleeve or rivet body to cause legs formed in the latter to collapse outwardly into engagement with the blind side of a work piece. Such legs are formed in the rivet body by providing longitudinal cuts or slots, and each of such legs is deformed or crimped inwardly to provide an offset condition which virtually insures proper and effective outwardly collapsing of all of the legs, substantially simultaneously. The stem is further provided with a portion for engaging such legs at their respective offset locations to insure hole-filling and strong, firm setting of the collapsed legs against the work piece.

Abstract: The invention is a blind fastener of the type having a hollow sleeve, spindle, and locking collar. The fastener differs from conventional blind fasteners in that the spindle has a cold work mandrel portion between the pull stem and shear pin portions thereof. Furthermore, all the principle dimensions and tolerances thereof are based on the sleeve shank outer diameter. The more important dimensions are the sleeve inside diameter of between 0.9000 times the minimum sleeve outer diameter and 0.8964 times the maximum sleeve outer diameter, the shear pin diameter of the spindle is between 0.9632 times the minimum sleeve outer diameter and 0.9534 times the maximum sleeve outer diameter and the tapered cold work mandrel portion larger diameter is between 0.9684 times the minimum sleeve shank outer diameter and 0.9585 times the maximum sleeve outer diameter.

Abstract: A flush break blind fastener is provided having as principle components a stem member, a drive-nut, and a deformable annular means. The stem member has an externally-threaded-portion on the accessible-side thereof, and may have a stem-head on the nonaccessible side thereof. The drive-nut is screwed onto the externally-threaded-portion of the stem member. The deformable annular means has as principle parts a head which is larger in diameter than the diameter of the boreholes of the workpieces, and an intermediate-part adjacent the head, and a deformable tail-part adjacent the intermediate-part and abutting the stem-head for securing the workpieces when the fastener is set. The outer-portion of the stem member contains a turning means for rotating the stem member relative to the drive-nut.

Abstract: A prefastenable torque-shear bolt has a bolt cut with a thread adapted to engage a nut, and full-fastening and prefastening grips each having wrench-engaging surfaces. One end of the bolt continues to a first transition portion that is tapered like a truncated cone. The full-fastening grip extends from the first transition portion and a full-fastening break-off groove. One end of the full-fastening grip continues to a second transition portion tapered like a truncated cone. The prefastening grip extends from the second transition portion and a prefastening break-off groove. The effective area of the fracture surface of the prefastening break-off groove is smaller than that of the full-fastening break-off groove. A first burr that arises on the threaded portion side when the full-fastening break-off groove is formed by rolling is formed on the first transition portion, and the outside diameter of the first burr is smaller than the diameter of the thread bottom in the threaded portion.

Abstract: A blind fastener for installation in aircrafts or the like and method for forming same comprised of a threaded nut threaded on a threaded screw or stem member having a stem head with a deformable sleeve mounted on the stem member between the stem head and the threaded nut. A torque lock is created between the threaded nut and the stem member to provide torque of the nut against the threads of the stem member without damaging the threads of the nut and the stem member.

Abstract: A fastener assembly with a break mandrel blind rivet and a mating female component having head and tubular shank portions. The tubular shank includes major and minor bore sections and an intermediate internal shoulder. The blind rivet telescopes into the female component to provide a grip range. Positive axial draw-up between the rivet and component upon tensioning of the mandrel is achieved by engagement between an expanded area of the blind rivet and the internal shoulder of the female component. The head of the female component has a central aperture for receiving the end of the mandrel to increase the grip range of the assembly. A plastic case molded around the head and shank closes off the aperture and affords a weatherproof seal.

Abstract: A self-sealing expansion rivet assembly comprises an expandable hollow plastic rivet and a plastic drive pin therefor. The rivet has a head and a slotted expandable shank for insertion in aligned holes in sheets which are to be joined together. The drive pin has a head and a serrated shank which, when inserted in the rivet bore and axially drawn thereinto by a tool, causes the pin head to engage the insertion end of the rivet shank and effect outward expansion of the rivet shank to fasten the sheets together, as well as break-off of the projecting end of the pin shank. The pin shank serrations engage a serrated reduced-bore portion in the rivet to hold the pin and rivet together permanently. Integrally formed annularly-shaped conical flexible liquid sealing flanges are provided on the rivet on, at or near the rivet head. As the rivet is expanded by the tool, the sealing flanges are forced against the adjacent panel around the hole therethrough to form a leak-proof seal.

Abstract: The rivet comprises a tubular body 12 having a shank 14 having a rivet head at one end and an end portion 32 of which is tapered externally and internally towards the other (tail) end 20. A stem 10, disposed in the bore 18 of the body, has a stem-tail 22 which projects from the head end and breaks off when the rivet is set, a plug 24 in the bore 18, and a terminal head 28 abutting the tail-end 20. The diameter of the plug is reduced progressively and stepwise towards the terminal head, providing an abutment 50 and an annular groove 29 between the terminal head 28 and the abutment 50. Material of the end portion 20 extends into the groove to maintain the body and stem assembled, and enters further into the groove during setting of the rivet.The rivet is set by pulling the stem tail while supporting the body, causing the shank to collapse into a bulge which provides a blind head.The external tapering of the portion 32 promotes bulging at a lower applied force than would otherwise be required.

Abstract: A blind fastener including a pin and a sleeve and having grip compensating means for accommodating workpieces varying in total thickness and having means for expanding the sleeve for filling the clearance between the fastener and associated openings in the workpieces and at the same time providing material from the sleeve in the area of expansion to define a lock between the pin and the sleeve.

Abstract: A split-setting pull-type blind-riveting assembly comprising a hollow rivet and a mandrel. The underside of the mandrel head is frusto-conical and terminates at flat surfaces normal to the mandrel stem. A portion of the mandrel stem adjoining said plane is squared off so that its corners deform the rivet shank before the underside of the mandrel head splits it into petals. Reliable splitting of the rivet shank into uniform petals is thereby reliably achieved.

Abstract: A fastener for securing workpieces having aligned bores and including a tubular sleeve and a pin with the sleeve having an elongated sleeve shank and a through bore and the pin having an enlarged pin head and an elongated pin shank, the pin shank having a retaining groove and a lock groove located proximate thereto, a resilient retaining clip located in the retaining groove and being axially captured therein, the retaining clip being of a split construction and having a relaxed outside diameter greater than that of the workpiece bores and being adapted to be located in at least one of the bores with an interference fit to thereby axially retain the pin to the workpieces in a preassembly, the sleeve shank having a sleeve lock groove adapted to be radially deformed into an aligned lock groove in the pin, the sleeve shank having a grip adjusting groove adapted to deform radially whereby the fastener can accommodate workpieces varying in total thickness.

Abstract: A fastener for securing workpieces having aligned bores and including a tubular sleeve and a pin with the sleeve having an elongated sleeve shank and a through bore and the pin having an enlarged pin head and an elongated pin shank, the pin shank having a locking groove, a resilient retaining clip located in the locking groove and being axially captured therein, the retaining clip being of a split construction and having a relaxed outside diameter greater than that of the workpiece bores and being adapted to be located in at least one of the bores with an interference fit to thereby axially retain the pin to the workpieces in a pre-assembly, the retaining clip and pin lock groove defining a lock cavity, the sleeve shank having its free end adapted to be radially deformed into the lock cavity, the sleeve shank being adapted to buckle radially after the sleeve free end is deformed into the lock cavity whereby the fastener can accommodate workpieces varying in total thickness.

Abstract: A corrosion resistant angled head fastener is disclosed for use with at least two non-metallic panels. The panels defining a bore and a counterbore with the counterbore and a portion of the bore being in one panel and the bore extending through another panel. The fastener head has an end face with two angled sections. The first section extends forwardly of the face of the head and the second section extends forwardly of the first second. The included angle of the taper of the second section is between about 100.degree. and about 170.degree.. The head section is configured to fit into the counterbore of the panel.

Abstract: A blind rivet includes a body having a shank, a head and a bore therethrough and includes a drawing mandrel having a shank receivable in the bore in the body and having a head at one end of the shank, the maximum diameter of the head being substantially equal to the outside diameter of the body shank. The body shank has, at a location spaced from the free end of the shank, a section of reduced wall thickness defined by a step increase in the diameter of the bore. A plurality of spaced planar bevel surfaces are preferably provided on the head of the drawing mandrel and are inclined inwardly toward the top thereof. In one embodiment, the portion of the bore on the side of the step remote from the free end of the body shank preferably widens conically toward the head of the body.

Abstract: A blind, self-plugging rivet assembly for securing together two members (42, 43) is of the type comprising a tubular shell (13) with an enlarged head (14) at one end, and a stem (12) which extends through the bore (15) of the shell, the stem having an enlarged head (38) beyond the tail end (18) of the shell.The shell has a weakened zone (19) formed by three slits (22) extending along part of the shell shank and spaced apart equiangularly around it. The stem head (38) lies beyond the shell tail end, and has an underhead surface (39) which is slightly convex and is bounded by a sharp edge (40).The stem has a pulling portion (32) connected by a breakneck to a plugging portion (31) which is an interference fit in the shell bore. Adjacent the breakneck the plugging portion has a cylindrical skirt which, when the rivet has been installed, can be deformed outwardly to lock the plugging portion to the shell. A bead on the stem guides the tool for deforming the skirt.

Abstract: A blind fastener assembly is disclosed, which is suitable for use in joint assemblies including advanced composite materials. The fastener assembly includes a pin, an expander, a sleeve, and an expandable washer, each of which have an initial diameter which permit them to pass through a hole in the workpiece. The washer is mounted about the pin shank between the sleeve and a tapered nose portion of the expander. The fastener assembly is inserted in a hole in the workpiece so that the expander head abuts the workpiece. Rotation of the pin causes the sleeve to force the washer to slide over the tapered nose portion of the expander causing it to expand and abut the blind side of the workpiece. In one embodiment of the invention the pin threadably engages the expander, and the head of the pin is positioned on the blind side of the workpiece. The washer is initially seated in a groove in the pin shank.

Abstract: A plastic insert-mold element comprises a plastic female member and a metal piece member insert-molded within the female member and provided with one or more frangible portions formed by cutting notches and/or a perforation therein. The metal piece member is pulled up and slid up the interior of the female member inserted through fitting holes in objects such as panels, consequently to effect panel-to-panel or panel-to-part fixation and electrical connection by a simple operation. The frangible portions of the metal piece member are torn off by continued work of pulling up the metal piece member, to remove an unnecessary portion protruding from the female member.

Abstract: An expansion rivet assembly comprises an expandable hollow plastic rivet and a plastic drive pin therefor. The rivet has a head and a shank which is insertable in aligned holes in workpieces to be joined. The drive pin has a head and a shank which is inserted in the rivet bore and adapted to be axially drawn into the rivet bore by a tool which causes the pin head to engage the insertion end of the rivet shank and effect outward expansion of the rivet shank wall and which also causes break-off of the superfluous projecting end of the pin shank at a break-away indentation formed in the pin shank. The pin shank has a groove near its head end which engages a reduced diameter bore portion in the rivet to temporarily hold the pin and rivet together prior to use. The pin shank also has serrations which engage another reduced bore portion in the rivet upon full pin insertion to hold the pin and rivet together permanently. The said other reduced bore portion is serrated to enhance engagement with the serrations.

Abstract: A double action blind rivet assembly comprising an outer sleeve member with an annular head flange at one end and having an initial outside diameter such that it is receivable through the holes in the workpieces and a length such that it projects from the blind side of the workpieces for the formation of a blind head therein; an inner sleeve member with an annular head flange at one end and having an outside diameter larger than the inside diameter of the outer sleeve member so that, when the inner sleeve member is driven into the outer sleeve member from the accessible side of the workpieces, it will expand the outer sleeve member into a prescribed interference fit by expanding the holes through the workpieces with the inner sleeve member also having a length such that it projects from the blind side of the workpieces after it is driven into the outer sleeve member; and internally supporting the inner sleeve member while it is being driven into the outer sleeve member with a blind head former section thereon

Abstract: A method and apparatus for forming a hollow sleeve for a blind fastener including the steps of forming a sleeve blank to have an enlarged sleeve head and a through bore having a radially inwardly extending shoulder forming portion, deforming the material on the shoulder forming portion to move axially toward the sleeve head and radially inwardly from the reduced diameter bore portion and substantially deforming the material away from the sleeve head and back towards the contour of the reduced diameter bore portion to form a sleeve stop shoulder.

Abstract: A blind fastener, producing a large blind side bulb, and including a locking ring to hold the fastener in a secured position against stresses. A collapsible barrel segment is disposed on the blind side between the end of the body portion and the head of the pull stem to effect the expansion of the body portion on the blind side. The barrel resists collapsing under loads sufficient to expand and flare the body portion of the fastener to produce the desired large bulb but collapses upon satisfactory flaring having been accomplished. The collapsible barrel, being collapsible along an angle, makes the fastener particularly well-adapted for fastening non-parallel surfaces.

Abstract: A tubular rivet is formed having flared conical head portions in fastening elation to a plurality of laminates presenting outer surfaces that are inclined to planes normal to a bore through the laminates and having countersinks the axes of which are normal to the respective outer surfaces by means of a mandrel having a conical forming head on a bendable pull shaft extending through an annular anvil having a conical forming surface and adapted to swivel relative to the pull shaft.

Abstract: A unique two-part fastener consisting of a pin and a tubular member adapted to be set by a tool having a set of jaws to grip the pin and a swaging anvil for swaging the collr onto the pin and in which the pin has a set of substantially identical annular grooves formed along a major portion thereof and in which the set of annular grooves provide combination grooves some of which function as locking grooves and a selected one which functions as a breakneck groove and in one form the fastener including a second set of grooves of a different construction which function only as pull grooves; the first set of grooves provide a unique relationship with a swaged portion of the tubular member so that as the fastener is set, the pin will break off in a preselected one of the combination grooves within the outer end of the tubular member; the second set of grooves provide a construction which is compatible with a known type jaw structure on the tool.

Abstract: A blind rivet with a deformable annular clamping ridge around the leading end of the expansion section of the setting pin, with a tapered leading face and a crest diameter a few thousandths of an inch larger than the inside diameter to which the sleeve of the rivet is to be expanded, thereby to provide a high momentary clamping force against the workpieces to be riveted, greater bearing area as a result of the greater initial effective diameter, and a better hole filling because of the excess material provided by the ridge. The ridge may be of the same material as the remainder of the head, to be deformed as an incident to wire-drawing elongation of the head, or may be a soft-coating applied to a harder core material.

Abstract: A blind fastener is disclosed which comprises a sleeve and pin of a selected metal in which the pin is designed to form a blind head over a wide range of grips which offers substantially uniform tensile values over the entire grip range. The blind head forming end of the pin includes a plurality of spaced annular or helical ribs formed between spaced annular or helical grooves which are designed to progressively distort or fold as the pin is pulled through the sleeve, at least one of the ribs remaining in an unfolded condition after the fastener is set. The pin shank and internal opening of the sleeve may be provided with complementary tapers to provide a sealing effect if desired.

Abstract: A blind fastener assembly for securing together panels or sheets of material which may have the same or different hardness and thickness and also for attaching articles to panels or walls of relatively soft material. The assembly includes a hollow rivet body having a fixed head portion at one end and longitudinally separable and spreadable sectors formed by axial slots at the opposite end of the rivet body. An elongated pin located within an axial cavity of the rivet has an enlarged tapered end portion. Between the pin end portion and the opposite end of the rivet body is a deformable sleeve member adapted to bear against the inner end of the rivet. Axial pulling force on the pin causes its tapered end portion to compress and deform the sleeve against the inner slotted end of the rivet body and ultimately causes its longitudinal sectors to spread apart.

Abstract: A tubular fastener has an axially extending tubular shank receivable in a work bore and an annular head receivable in forcible engagement with the work material forming a counterbore. The fastener also is characterized by:(a) the head having an annular end face, a first forwardly tapered section located forwardly of that end face to forcibly engage the work counterbore and a second forwardly tapered section located forwardly of the first section, the taper angularity of the second section substantially exceeding the taper angularity of the first section,(b) a stem extending through the tubular shank and head, and(c) structure responsive to retraction of the stem toward the head end of the fastener to expand at the opposite end of the fastener and axially retain the fastener in position with the head first section forcibly engaging the counterbore, in non-rotating condition.

Abstract: A blind bolt is of the type comprising a tubular shell 14 through which extends a stem 13 with an enlarged head 12 at one end which, in installation of the bolt, is pulled into the shell 14 to expand it and form a blind head. The stem 11 is provided with two opposed deformations 19 to prevent the shell falling off the stem before installation. Each deformation has a relatively shallow sloping profile with its higher end towards the shell, and the width of the deformation is a maximum at the bottom end of the slope and a minimum at its higher end. The deformations are formed by pinching up portions of the stem between two opposed dies, the shape of the bite between the dies being tapered in the direction along the stem.

Abstract: A pull-type blind fastener assembly includes a mandrel, expander, sleeve and lock collar. The expander extends through aligned holes in at least two workpieces, that are to be joined and has an enlarged head and a shank portion with a pair of conical tapered surfaces separated by a constant diameter surface thereon, adjacent the blindside end thereof. The tubular sleeve has a maximum thickness portion adjacent one end, an intermediate portion of medium radial thickness and a minimum radial thickness portion adjacent the other end. When an axial force is exerted on the mandrel by means of a conventional pulling tool, the minimum sleeve thickness portion is forced successively over the first and second conical expander surfaces where it is expanded, and a radially outwardly extending bulb begins to form at approximately the intersection between the minimum and medium thickness portion adjacent the other end.

Abstract: A self-plugging blind rivet (10) embodies lockingly interengageable members in the form of a headed tubular rivet body (12) with a bore (20) which reduces in diameter towards the head (18), and a mandrel (14) for setting the rivet. The mandrel (14) has a break-off stem (60) and a plug portion (62) which is left in the bore (20) of the rivet body (12) after setting the rivet. The plug portion (62) engages the end of the body (12) remote from the head (18) and has radially projecting longitudinal splines (102) which form grooves in the body (12) when pulled into the reduced diameter region (26) of its bore, and has a cylindrical swaging portion (84) which swages material of the body into parts of the grooves along which the splines (102) have passed so as to lock the plug (62) in the bore (20) and prevent its retraction from the set rivet.

Abstract: A one-piece plastic plug-rivet having an open frame body which is laterally expandable and having a cylindrical appendix disposed within the body and being formed with a pull shank for producing the expansion. The cylindrical appendix is provided with projection means which cooperate with a stepped aperture in the head of the plug-rivet for maintaining the body in the expanded condition.

Abstract: A blind rivet assembly is disclosed. The rivet assembly comprises a mandrel, a rivet body, a buckling sleeve and a locking collar. The sleeve, rivet body and collar are slideably disposed about the mandrel with said buckle sleeve disposed adjacent one end of the body and the mandrel extending through the body and beyond the other end of the body. The buckle sleeve has a generally cylindrical configuration such that when subjected to a pulling force, the sleeve buckles outwardly from the mandrel, slides about the rivet body and engages a work piece.

Abstract: A self drilling, closed end, blind rivet has a hexagonally shaped flange, or other suitably shaped means of driving, at one end and a hardened drill bit at the other end, with the two being joined by an integral sleeve wall with a rolled groove in it that forms an internal chamber to retain the head of a mandrel. Withdrawal load on the mandrel, after the rivet has been inserted through a hole drilled by it in a plurality of layers to be joined, will upset the sleeve wall into a folded flange that coacts with the hex head, or other driving means, to tightly grip the outside face and the blind face of the layers being joined.

Abstract: A fastener is provided for securing an article to a support without making a hole in the support and wherein access can be gained to only one side of the support. The fastener is welded to the accessible surface of the support and the article is clamped to the support by setting the fastener with a blind-riveting tool.