Abstract: This invention relates to an improved blind fastener assembly and an improved joint assembly using the blind fastener assembly. The blind fastener assembly is adapted to be installed in a workpiece having a first and a second surface with an opening therebetween. The blind fastener is of the type having a core pin, expander means, expandable sleeve means, and resilient washer means, each having an initial diameter which permits it to pass through the opening in the workpiece. The improvement in the blind fastener assembly in accordance with this invention comprises the washer means having two portions including an inner portion and an integrally formed outer flange portion. The inner portion has a tapered nose section tapering outwardly away from the core pin shank portion to facilitate expansion of the sleeve means over the inner portion. The integrally formed outer flange portion is adapted to be unfolded by the sleeve means to form a bearing surface against the second surface of the workpiece.

Abstract: A mounting assembly for fixing a panel to a space frame defining the general shape of an automotive vehicle that provides accurate, adjustable positioning of the panel with respect to the space frame and accommodates differential growth and shrinkage of the frame and the panel induced by temperature changes. The assembly includes a multi-piece fastener held axially and radially fast with respect to the space frame and axially and radially free with respect to the panel.

Abstract: A fastener mandrel has formed on one end a spherically curved shoulder and an elliptically shaped head adjoining the shoulder. In setting the fastener in a workpiece, the shoulder enlarges the end of a tubular rivet and clamps workpieces together in combination with a preformed head on the other end of the rivet. The mandrel head deforms the rivet tail into an elliptical shape that partially encloses the mandrel head to provide good stem retention. A plurality of annular ribs on the mandrel stem are drawn into a reduced diameter section of the rivet head end when the rivet is set, thereby providing additional stem retention.

Abstract: A fastener for use in fatigue resistant structures such as aircraft wings. The fastener is installed into interference fit by tool engagement in a tapped hole coaxial with the threaded end of the pin, at the threaded end of the fastener pin. The tapped hole is engaged by a hardened mandrel which is detachably threaded into the threaded hole in the pin. The mandrel has an extending tail end which may be gripped by a pulling tool after the threaded end of the pin is partially inserted into the workpiece with the mandrel extending through the workpiece. The tail end of the mandrel is engaged by a pulling tool that can be manually or power actuated to pull the interference fit shank into the structure workpiece to produce a fatigue resistant interference between the pin shank diameter and the workpiece hole diameter.

Abstract: A failure indicating device wherein a fluid is encased within a bore in a fastener. In another embodiment of the invention, the fluid is encased within a thin walled capsule which in turn is encapsulated within a bore in the fastener. Upon failure of the fastener, the encased fluid will leak out into the external surface and its detection will indicate that the fastener has failed. The stress which causes the fastener to fail will also assist the fluid to leak out onto its external surface. To facilitate the leakage of the fluid, one or more shallow and narrow groove(s) may be machined onto the external surface of the fastener so that the leaked fluid will travel along this groove(s) to the preferred external end of the fastener. This is desirable in cases where only one side of the joint is accessible.

Abstract: A blind fastener for securing workpieces 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 to be 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 having an outside diameter slightly smaller than the diameter of the boreholes, and a deformable tail-part adjacent the intermediate-part and abutting and 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 blind fastener comprises a fastener body, a stem and a shaped shear ring wire. The shear ring is disposed in an annular groove disposed intermediate the ends of a neck portion of the stem. When the fastener is installed, a bulbing portion of the shear ring upsets the tail end of the fastener and then shears at a predetermined load. An anchored portion of the shear ring travels through the fastener body, with an enlarged neck portion of the stem radially expanding the fastener to fill the hole within the workpieces being secured together. A lock ring groove is formed in the stem midsection of smaller diameter at the intersections of the stem neck and midsection.

Abstract: A structural splitting self plugging pull mandrel blind rivet includes a tubular rivet body and a T-mandrel disposed therein. A locking plug is provided on the T-mandrel and includes a locking section having a plurality of locking rings and a shoulder including a secondary locking mechanism. The secondary locking mechanism preferably includes a peripheral groove in the shoulder with a peripheral lip protruding above the shoulder at each longitudinal side of the groove. The peripheral lip adjacent the mandrel head protrudes further than the peripheral lip adjacent the locking section, with the secondary locking mechanism forming a fishhook profile. The peripheral lips are also bevelled toward the mandrel head and the locking rings in the locking section are circular and spaced from one another.

Abstract: A blind fastener comprises a fastener body, a stem and a shaped shear ring wire. The shear ring in one embodiment is disposed in an annular groove disposed intermediate the ends of a neck of the stem. When the fastener is installed, a bulbing portion of the shear ring upsets the tail end of the fastener and then shears at a predetermined load. An anchor portion of the shear ring travels through the fastener body, with the stem neck radially expanding the fastener to fill the hole within the workpieces being secured together. A lock ring groove is formed in the stem midsection of smaller diameter at the intersections of the stem neck and midsection. In another embodiment, the shear ring is positioned at the intersection so that the shear ring anchor portion engages the rear of a lock ring positioned in said lock ring groove.

Abstract: The self plugging blind rivet with a large grip range includes a tubular shell having a head at one end and an elongate shank portion which includes axial slits for permitting the shank portion to expand radially to form a blind head. The bore extends through the head and the shank portion and includes a shoulder at a midportion thereof to form a locking portion of reduced diameter. A stem is fitted in the bore of the tubular shell and includes a head positioned adjacent the another end of the shell, as well as a shank having a breakneck. A shoulder formed adjacent the stem head has an enlarged diameter swaging portion, while a split ring is formed on the stem shank between the breakneck and the swaging portion. During the setting of the rivet, the swaging portion deforms the locking portion of the shell so that the material thereof flows around the split ring for locking the stem within the set rivet.

Abstract: A hinge pin is temporarily held on a first hinge member on the automobile body by means of a hinge pin support mechanism. A door to be attached to the automobile body is held in position, and a second hinge member on the door is brought into engagement with the first hinge member. The hinge pin is pressed into the second hinge member through the first hinge member to couple the door to the automobile door. The hinge pin support mechanism includes a hinge pin retaining member including a ring separably joined to a plurality of legs. When the hinge pin is pressed into the hinge members, the ring is sheared off from the legs and rides in a peripheral groove defined in the hinge pin. The ring then engages one of the hinge members to prevent the hinge pin from being removed from the hinge members. The door can automatically be attached to the automobile body by a door attaching mechanism and detached from the automobile body by a door detaching mechanism.

Abstract: The invention relates to a blind riveting member of the type comprising a tubular sleeve (1) and a mandrel (2) passing through said sleeve. The stem portion (5) of the tubular sleeve (1) comprises successively along its length, a first articulation zone (5a), an inclined portion (5b), a second articulation zone (5c) and an end portion (5d). These zones or portions are arranged in such a manner that the sleeve is subjected to a double folding during setting of the rivet which causes the inclined portion to expand and fold back upon itself toward the materials being assembled, forming a continuous rest surface at the periphery of the hole which contains the riveting member. The invention is applied in particular for assembling fragile materials such as composite materials. It permits providing a good vibration resistant holding for these materials without risk of damaging the same.

Abstract: In this fastening system two or more layers of material are fastened together by inserting a hollow sleeved fastener such as a rivet or a bolt into the hole in a high interference fit to expand the hole radially. The sleeve is configured either as a collar and a straight shank or as an angled upper portion combined with a shank for counterbored applications. The intersections between either the collar and the shank or the angle portion and the staight shank are designed with an enlarged radius such that when the sleeve is expanded after the insertion of the fastener inside of it, this radius is expanded, which in turn stress coins the adjacent edge of the hole in the layers. This localized stress coining as well as the hoop stress in the hole surrounding the hole dramatically increases the fatigue strength of the fastened layers in a structure assembly.

Abstract: A fastener having an assembly comprising a sleeve and pin for telescoping movement therein useful for clamping together a plurality of work pieces has two mechanical locking structures for locking the pin and sleeve together. One locking mechanism comprises material contained in a reduced diameter section of the sleeve which is formed into a first locking groove of the pin as a result of pulling the pin into the sleeve. A second lock comprises a locking crown formed in the sleeve head which is formed into a second locking groove in the pin by means of increased pulling pressure applied by the setting tool against the locking crown after pin movement has stopped. The design of the pin head is such that a clamping of the work pieces occurs prior to expansion of the sleeve in the apertures of the work pieces and prior to setting the double locks of the pin to the sleeve.

Abstract: A blind setting rivet which may be used to secure two layers of materials together is disclosed which drills and deburrs its own aperture through the two layers of materials and attaches the materials together in a secure, water-resistant, sealed manner. The rivet includes deburring ears to remove any burrs from the drilling operation, thus ensuring that the rivet head will fit in a flat manner on the outside surface of the materials to be secured. The shaft used to set the rivet has a plurality of spiral flutes located around the circumference thereof, which spiral flutes ensure the application of a uniform amount of force to set the rivet prior to fracture of the shaft.

Abstract: A self-plugging blind rivet comprises a tubular shell shank having a preformed radially enlarged head at one end a region of increased diameter and hardness at the tail end, adjacent the head of the stem. The rivet is formed by compressing the stem and a plain cylindrical shell in a die having a portion of enlarged bore diameter at the tail end region, whereby the shell is expanded into the enlarged bore portion with resulting work hardening.

Abstract: A fastener, intended for fastening a sandwich panel (b) to a support (a), and including a headed bolt (1) having a break off tail portion, and a flanged tubular body (4) into which the main portion of the shank (3) of the bolt is pulled so as to lockingly interengage the body and set the fastener, includes a deformable tubular spacer (10) disposed on the shank (3) of the bolt (1) between the body (4) and the head (2) of the bolt (1). The spacer (10) is in the form of a sleeve having a tubular central core, and peripheral grooves (12) between which are annular fins (11). The spacer is capable of being deformed to a substantially shorter axial length by axial compression under substantially constant predetermined load.

Abstract: The present invention relates to an improved arrangement for attaching a plastic panel and metal mounting strip sub-assembly to an automotive body metal substructure enabling controlled distortion free thermal expansion and contraction of the plastic panel relative to the mounting strip. The attaching arrangement comprises a metal spacing washer having a tubular sleeve portion formed with an integral frusto-conical spring flange. The washer sleeve portion free end extends through an elongated slot in the mounting strip and an aligned circular opening in the panel. A blind breakstem rivet is inserted through the washer bore and upon being set applies a predetermined axial clamping force biasing the washer flange into contact with the mounting strip. The rivet head undersurface may be provided with an annular locking ring adapted to engage the plastic panel out surface.

Abstract: A fastener for securely fastening a plurality of members having a sleeve with a generally tubular portion and a flange extending radially from one end of the tubular portion and having a mandrel with an enlarged head and a generally cylindrical stem, the stem having a grooved locking section in which the locking groove has a longitudinal component and an adjacent tapered section containing a breakneck groove, the tapered section tapering radially outward toward the mandrel head and ending in a shoulder having an outer diameter signal to or greater than that of the locking section to provide a surface for improved retention of the mandrel with respect to the sleeve when the fastener is installed.

Abstract: A blind fastener is disclosed. The fastener comprises a tubular nut, a buckling sleeve and a mandrel. The buckling sleeve on one of its ends has a bearing face radially overhanging a facing restraint face of the tubular nut, and a tapered surface which deforms upon threaded drawing of the mandrel through the nut to approach the shape of a plane normal to the axis of the fastener.

Abstract: A breakstem blind rivet comprises a deformable tubular shell 11 of aluminium alloy having a bore 12 inside it. A stem 13 of low-carbon steel is a close fit within the bore, extending along the bore and having a head 14 adjacent the tail end 15 of the shell. The outside of the shell is formed with at least three zones 27, 28, 29 of modified strength spaced apart along its length, these zones being in the form of shallow grooves rolled into the surface. The spacing between each zone 27, 28, 29 and the next progressively decreases as the distance along the shell from the tail end 15 increases. Alternatively the grooves may be formed by a turning process.

Abstract: A blind fastener for fastening workpieces of a crushable or composite material and which provides a blind head having a large bearing area against the adjacent blind side of the workpieces and having a main sleeve with a tapered nose and an expandable sleeve with the expandable sleeve having a primary section and a secondary section with the secondary section having a wall of reduced cross-sectional area and of a lower hardness and/or material strength than the primary section such that after the secondary section has moved past and been expanded over the tapered nose the leading end of the primary section will substantially not move radially inwardly as it is moved over the tapered nose and at a preselected axial or column load the secondary section will substantially fold or collapse to form the blind head with a large bearing area while the primary section will substantially not buckle whereby the pin can provide a visual and/or measurable indication that the fastener has been installed in a proper grip co

Abstract: An insulated blind rivet mounting arrangement in an aperture in a wall including a blind rivet having a tubular rivet member and a actuating rod that is disposed within the tubular member and is adapted for axial withdrawal therefrom; an insulating sheath made of non-electrically conductive material positioned over said tubular rivet member; and said blind rivet actuating rod being removable from said tubular rivet member for expanding the tubular rivet member and insulating sheath into tight interfitting relation with each other within the wall aperture. Alternative embodiments are disclosed in which one or more coaxially disposed tubular flanged members are utilized to complete the mounting, with the insulating sheath being effective to thermally and electrically insulate the tubular rivet member. The insulating sheath, which preferably is made of a resilient plastic material, also is effective for creating a substantially vibration-free mounting within the wall aperture.

Abstract: Predetermined limits are attained for the peak loads encountered when a composite assembly of workpieces is secured with a swaged collar fastener, by disposing cavities in the cylindrical wall of the fastener collar to receive material flow during the swaging operation. Rotation between the collar and pin of the fastener is precluded by disposing abutting portions on the pin, which interface against the swaged material of the collar. Fastener cost reductions are achieved by decreasing the volume of a post-swage scrap portion on the pin and by concurrently fabricating grooves thereon with a rolling die, for various functional purposes. Swaging tool malfunction is avoided by eliminating land surfaces adjacent to grooves on the pin through which pull is applied thereto with the tool.

Abstract: A blind fastener comprises a tubular sleeve, a mandrel stem and an integral shear ring and locking collar assembly. The integral shear ring and locking collar assembly has a wedge-shaped bulbing portion for expanding the blind side of the fastener sleeve in response to a pulling force on the stem, and a leading finger which functions as a locking collar. As the mandrel is pulled axially away from the sleeve, the leading finger portion radially expands the body of the fastener sleeve while the wedge-shaped portion axially compresses the tail end of the sleeve to form a blind head. After forming the blind head, the wedge-shaped bulbing portion shears. The leading finger continues travelling through the fastener sleeve, radially expanding the sleeve to fill the hole between the sleeve and the workpiece. When the leading finger meets with an anvil washer it buckles into a recess formed in the sleeve so as to interlock the sleeve and the mandrel stem.

Abstract: A blind fastener with an axially extending sleeve having an axially extending internally threaded passage therethrough. A head at one end has an axially facing surface thereon with a periphery which is centered on its axis. A mandrel includes an axially extending threaded shank that is threaded into and through the passage. A torque-off groove is formed on the shank. Torque tool engaging surfaces are accessible at the head end of the sleeve, and blind upsetting structure is axially movable by rotating the mandrel to form an enlarged body at the unheaded end of the sleeve. A nut is threaded to the mandrel with a bearing face facing toward the surface of the head of the sleeve. The bearing face of the nut is concavely shaped so as to make contact with and thereby to make a retention engagement with at least some points around the periphery to hold the sleeve against rotation relative to the nut when the mandrel is drawn into the sleeve with the nut pressed against the head.

Abstract: A locking apparatus for blind fasteners providing improved yield and fatigue performance of the blind fasteners is disclosed. The locking apparatus utilizes a locking collar which will slide over the fastener stem and within the tubular rivet sleeve of the fastener without preforming into the locking groove on the stem. The locking collar is formed so that upon the pulling of the stem during installation of the blind fastener, specially formed tapered regions in the locking collar then adjacent the locking groove on the stem cause the region of the locking collar immediately thereabove to be encouraged tightly inward against the locking groove to provide a particularly tight fit in the locking groove. In an alternate embodiment, the locking collar is formed so that upon pulling of the stem during installation of the blind fastener, a specially formed locking collar buckles inward to pack tightly into the locking groove.

Abstract: Profiled bolt mounting unit for mounting on a structural member, comprising a blind rivet body having a sleeve and a flange for abutting against the structural member provided for mounting purposes with a mandrel having a setting head and a pull stem which may be gripped by a setting tool and detached from the mandrel at a predetermined breaking point (break neck) after exceeding a certain pulling force. The predetermined breaking point is separated by such a distance from the flange that the portion of the mandrel between the flange and the predetermined breaking point acts as a profiled bolt, whereby the mandrel portion remaining inside the blind rivet body after the setting process projects the profiled bolt portion away from the flange.

Abstract: A blind rivet able to be anchored in material such as softwood, without the need to break through the blind face of the material, comprises a tubular shell and a stem which extends through the shell. The shell has a preformed heat at one end of a shank. An end portion of the shank remote from the head has a thinner wall than the main, next adjacent, portion of the shank, and is thus weakened and made more easily expandible. The stem has a plugging portion having an expander head adjacent the thin-walled end portion of the shell, a breakneck, and a pulling portion which projects from the head end of the shell. The expander head increases in diameter away from the pulling portion, and presents a plurality of longitudinal cutting elements generally towards the weakened end portion of the shell. On gripping the pulling portion and pulling the stem, the cutting elements split the end portion of the shell into a plurality of legs, while the expander head enters into the end portion and forces the legs outwardly.

Abstract: A self-plugging blind fastener of the type having a tubular, headed, body, and a stem which is pulled and locked relative to the body to set the fastener, has improved locking means provided in the form of a deformable annular locking collar which is disposed on the stem, a locking groove on the plug part of the stem, and an annular recess at the head end of the body provided as an enlargement of the bore. The recess has a generally cylindrical outer region of substantially greater diameter than the main region of the bore, and a tapered inner region in which the diameter of the recess reduces to that of the main region of the bore. The recess can be stepped between the outer and inner regions.

Abstract: A blind fastener for securely and economically fastening a plurality of members having a mandrel with an enlarged head and a generally cylindrical stem with a locking groove, and a sleeve with a generally tubular portion surrounding a portion of the stem, a flange extending radially from the end of the tubular portion opposite the stem head, and a boss extending axially from the flange opposite the tubular portion, so that application of tension to the stem and compression to the boss causes upsetting of the fastener, compression of the members, elongation of the stem, and displacement of the boss material into the locking groove, thereby locking the mandrel and sleeve to prevent them from springing back upon breaking of the mandrel stem.

Abstract: A blind fastener for fastening workpieces of a crushable or composite material and which provides a blind head having a large bearing area against the adjacent blind side of the workpieces and having a main sleeve and an expandable sleeve with the expandable sleeve having a reduced section or secondary portion at its leading end adapted to be severed from the remainder or primary portion of the expandable sleeve at a preselected axial or column load at which buckling has been initiated with the severed reduced section portion being substantially folded or collapsed to form the blind head with a large bearing area.

Abstract: A blind rivet, for anchoring in relatively soft material such as softwood, comprises a tubular shell (14) with a weakened portion (19) at the end remote from the head (18), and a stem (15) with an enlarged head (29) having a smooth underhead curve (32). The weakened portion (19) of the shell has four longitudinal V-section grooves (24) on its inner wall. In addition, the weakened portion (19) has a wall thickness which is less than that of the remainder (22) of the shell, the junction between the two parts presenting an internal annular shoulder (23). When tension is applied to the pulling portion (26) of the stem, the stem head (29) enters the weakened portion (19) and splits it apart along the grooves (24) to form legs which anchor in the soft material. The higher strength of the remainder part (22) of the shell prevents the stem head passing beyond the shoulder (23) before the stem fractures at the breakneck (27).

Abstract: An elongated stem extends through a bore in a sleeve having a preformed head at one end. The sleeve extends through aligned holes in one or more workpieces to be fastened together. Pulling the stem through the sleeve causes an enlarged tail on the stem to be drawn into the end of the sleeve opposite the preformed head. The sleeve thus expands, forming a blind head. The workpieces are sandwiched between the preformed head and the blind head. To prevent the stem from sliding out of the sleeve, a locking collar is provided within the sleeve bore. The collar is slideable from a first position spaced from the preformed head to a second position within the preformed head. The collar is engaged by a shoulder on the stem and is moved from the first position to the second position as the stem is pulled through the sleeve. When in the second position, the collar is prevented from further movement, and is deformed as the stem continues to advance.

Abstract: A composite blind plastic rivet having a ductile plastic sheath fully covering the blind head on the rivet to preclude protrusion of fibers upon formation thereof.

Abstract: A blind fastener having an internally threaded sleeve with a head at one end and a taper at the other. A mandrel is threaded into and through the sleeve, and has a head that bears against a collar which it pushes onto the tapered end of the sleeve. A nut is threaded onto the mandrel to be turned against the head of the sleeve. In turn, the nut is restrained against rotation by a torque tool, and the mandrel is engaged by the tool to turn them counter-rotatively to set the fastener. The nut has a face that faces toward the head of the sleeve that is adapted to make at least a partially conforming engagement with recesses in the head of the sleeve.

Abstract: The rivet comprises a tubular rivet body of deformable material, and an elongate stem extending through the bore of the body. The body comprises a cylindrical shank and an enlarged rivet head at one end of the shank. The rivet head may be integral with, or separate from, the shank. The stem includes a plug, and a stem-tail connected to the plug by a frangible breakneck. The plug has a terminal head for abutting the shank, whereby the shank can be axially compressed on pulling the stem-tail and thereby deformed to form a blind head, and a locking groove circumferentially of the plug for receiving material of the rivet head which, during installation of the rivet, will be swaged radially inwardly into the locking groove to lock the plug in the body. The locking groove is of helical form, as with a screw thread, and enables the plug to be removed from the body by rotation, thus facilitating disassembly of the installed rivet and its removal from a workpiece.

Abstract: A two piece blind fastener for securing a plurality of workpieces including a hollow sleeve having an enlarged sleeve head at one end, a pin having an enlarged pin head, the pin having a pin stop shoulder and a lock groove located near the pin stop shoulder, the pin head adapted to engage the sleeve to form a blind head in response to a relative axial force applied between the pin and sleeve, the pin stop shoulder adapted to engage the stop shoulder with the material of the sleeve stop shoulder being directed substantially radially inwardly into the lock groove to lock the pin and sleeve together and to finally form a stop surface on the sleeve for stopping axial movement of the pin through the sleeve.

Abstract: A composite blind rivet wherein a ductile metallic sheath fully covers the blind head forming portion of the rivet before and after deformation thereof so as to preclude protrustion of said fibers upon formation of said blind head. The sheath is initially expanded radially along a thin-walled portion thereof during blind head formation by the hydrostatic pressure generated by axial compression of the rivet's composite core, whereafter axial compression of the sheath supplants the hydrostatic core pressure to radially outwardly buckle the sheath into a blind head preferably of frusto-conical cross-section. Subsequent to blind head formation, the sheath elastically maintains a radially inward bias on the rivet's composite core while elastically axially biasing the anvil from the workpieces, whereby clamp-up force is maintained notwithstanding nominal plastic cold flow of the rivet's composite core during use.

Abstract: The clutch disc for a friction disc clutch comprises friction linings attached to a lining carrier by connection elements. The connection elements are provided with a synthetic plastics conical head, seated in a conical opening of the friction lining. A shank, on the side of the lining carrier turned away from the friction lining, has been deformed into a closing head. The portion of the shank forming the closing head can consist of synthetic plastics, too, or can be formed by a metal hollow rivet anchored in the head. The synthetic plastics head wears out along with, and increases, the wearable volume of the friction lining.

Abstract: An installation system for securing workpieces of composite type materials and including a fastener adapted to be located in aligned bores in such workpieces with a preselected interference fit, with the fastener comprising a pin having an elongated shank, an enlarged head and enlarged diameter smooth shank section adjacent the pin head, and further having a threaded section extending from the smooth shank section to a breakneck groove located in the shank to define a frangible portion at its free end, the breakneck groove adapted to fracture at a preselected axial load of generally low magnitude, a thin gauged expansion sleeve having an inside diameter less than the diameter of the smooth shank section, the sleeve having an outside diameter permitting the assembly of the sleeve into the workpiece bores with a snug fit, the breakneck groove having an axial strength at least equal to the maximum axial load required to pull the pin member fully into the sleeve with the smooth pin shank section expanding the sle

Abstract: A pull type fastener including a tubular sleeve and an elongated pin having a disposable pull portion at one end thereof with the sleeve having an enlarged pin head and a shank, a helically splined portion on the pin shank having ridges and grooves and adapted to engage a preselected portion of the sleeve shank bore to move the sleeve material into the spline grooves. The degree of interference between the splines and the sleeve shank, and the relative hardness ratio of the pin to the sleeve being designed such that the sleeve materiall will flow into the spline grooves without radially expanding the sleeve into interference with the bore of the workpieces being fastened.The result being that until the moment of clamp up the sleeve will rotate relative to the pin along the helical splines at a minimum pull force, then at clamp up a momentary and substantially increased torsional force resulting from the sleeve rotation being arrested assists in severing the pin from the pull portion thereof.

Abstract: A blind bolt for securing workpieces including a sleeve, pin and lock collar, and generally being of the non-sleeve-expanding type (i.e.

Abstract: A blind rivet assembly with a tubular rivet body having a flange at one end and a mandrel which projects from the rivet flange and can be pulled to set the rivet at its tail end. The mandrel has heads at both ends, one to set the rivet and the other to engage pulling means of the setting tool. The setting and pulling heads of the mandrel are rounded. The mandrel has a neck within the rivet at which it breaks when the rivet has been set. The invention enables a shorter mandrel to be used, and facilitates its economical manufacture without adversely influencing the characteristics of the breakneck. The invention also facilitates feeding of the assemblies automatically to rivet setting tools.

Abstract: A blind fastener assembly suitable for use in joint assemblies including advanced composite material workpieces. The blind fastener assembly includes a core pin having an enlarged head, an expander having a head and a tapered nose portion and being mounted to the core pin, and a frangible sleeve mounted to the core pin between the enlarged head and the expander. The blind fastener assembly is insertable through aligned holes in the workpieces so that the head of the expander abuts the accessible side of the workpiece. Relative longitudinal movement of the core pin and the expander nut causes the sleeve to expand over the tapered nose and to break into two pieces, one of the two pieces expanding over the other of the two pieces to provide a large bearing surface on the blind side of the workpieces.

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 and expanded area of the blind rivet and the internal shoulder of the femal 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 closes off the aperture and affords a weatherproof seal.

Abstract: A pull-type blind fastener has a pin slideable through a tubular selectively annealed sleeve, the pin having a pin head permanently bonded to a blind side end of the sleeve, a hollow rivet head formed on the opposite end of the sleeve, and a raised abutment on the rivet head engageable by a conventional rivet setting tool. The rivet head collapses under the differential pulling force applied by the setting tool to a condition of reduced aperture for engaging a stop shoulder on the pin thus limiting axial pin travel at a flush breaking position.

Abstract: A blind rivet assembly is disclosed. The rivet assembly comprises a mandrel, a rivet body, a buckle sleeve, an expanding wrinkle sleeve, a pressure sleeve and a locking collar. The sleeves, 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 thereof. 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 workpiece. The wrinkle sleeve has a generally cylindrical, but longitudinally corrugated configuration, such that as the mandrel proceeds through the rivet body, the wrinkle sleeve expands radially and helps create an interference fit between the rivet body and an opening in the workpiece.

Abstract: A tubular fastener is positively locked to a workbore and counterbore, the fastener having a tubular shank in the workbore and an annular head in the work counterbore, the head also defining a counterbore, and employing a pin received in a bore defined by said tubular shank, and a lock ring, the pin defining a peripheral recess sunk toward the pin axis; the locking is achieved by:(a) retracting the pin relatively axially endwise in the shank by exerting axial force and transmitting force from the pin to a section of the shank projecting from the workbore to deform that section, thereby forming a bulb that grips the side of the work opposite the work counterbore, and bringing the pin recess into proximity to the head counterbore, and(b) deforming the ring to penetrate and lock into the pin recess and also within the head counterbore, and to exert radially outward force against the head, acting to radially compress the head against the work counterbore; whereby the deformed ring, the compressed head, and the pi

Abstract: A fluid tight metallic blind rivet, for aerospace applications, is disclosed comprising a tubular rivet body that is obtained by providing an outer ductile sleeve or jacket on an approved aerospace rivet body wherein the rivet is set by collapsing the body by means of a pull-stem that is locked relative to the body when the rivet is set.