Abstract: The present disclosure relates to an insert and system of installing the same. The insert includes a tapered core and a cylinder. The core releasably secures to an installation device which includes a depth stop or a depth control to control the installation depth of the insert. The insert may be provided in a tray that allows for easier handling of the inserts and installation thereof in installation holes, for example in a hydraulic manifold. In some cases, the core includes a threaded hole to releasably secure the insert to the installation device, thus allowing the installation device to pull the core into the cylinder. The core and cylinder may be made of metallic materials such as steels, steel alloys and others. In some cases the insert can withstand blow out pressures of 40,000 psi or higher.

Abstract: A multi-layer assembly, such as a sound damping metal laminate used in the automotive industry, having first and second rigid layers and an adhesive layer in between. A retention feature in the form of a raised embossment may be formed in one or more of the rigid layers and may be located near a fastening hole, which accommodates a nut and bolt or some other type of fastening device. The retention feature may impart rigidity and improved stiffness to the multi-layer assembly in the area surrounding the fastening hole, and it may also create a space between the rigid layers that is generally devoid of adhesive from the adhesive layer. This, in turn, can improve the long term performance of the multi-layer assembly by addressing issues such as compression set, spring back and/or stress relaxation. Methods of manufacture and other embodiments are also provided, including ones that accommodate multiple fastening holes, have discontinuous retention features, and use welds in place of nuts and bolts, to name a few.

Abstract: A fastener adapted to pass through aligned holes through workpieces is disclosed. The fastener includes a pin member having a transition portion wherein the diameter of the transition portion decreases radially as it extends from the smooth cylindrical shank portion to the threaded portion. The fastener may also comprise a sleeve member and a clamping means. The clamping means includes a collar, a nut, or any other possible clamping means. In exemplary embodiments, the workpieces can be formed with a plurality of materials, the materials including composite, metallic, or composite/metallic structures, any combination thereof. In particular embodiments, the fastener has interference capability of 0.0005 to 0.0100 inches in composite structures without risk of composite delamination or damage. As a result of the fastener interference, gaps between the fastener and the structure are eliminated thereby providing good electrical conductivity between components.

Abstract: A sleeve interference fastener adapted to be installed in a hole of a structure includes a sleeve; a pin member, wherein the pin member has a transition zone between a shank portion and a locking portion and wherein a portion of the pin member comprises a low friction dielectric coating; a locking member; wherein, in the installed position, a first interface between the shank portion of the pin member and the sleeve is substantially free from the low friction dielectric coating, and wherein, in the installed position, the transition zone of the pin member and a second interface between the locking portion of the pin member and the locking member are substantially covered with the low friction dielectric coating.

Abstract: A blind rivet assembly is provided. In another aspect, a blind rivet has ends that are received within countersinks in one or more workpieces and a mandrel head is completely pulled through the rivet without being severed from a mandrel stem. A further aspect includes a mandrel with an outwardly tapering shoulder.

Abstract: A sleeve interference fastener including a conformable sleeve, wherein the conformable sleeve is comprised of at least one first material having a hardness of X, and a pin member, wherein the pin member is comprised of at least one second material having a hardness of Y, wherein X is sufficiently less than Y so that, in an installed position of an interference fit, at least a portion of the at least one first material of the conformable sleeve conforms to a contour of an inner surface of a hole of a composite structure so as to create a continuous electrical contact at an interface between the inner surface of the hole of the composite structure and the conformable sleeve.

Abstract: A novel fastener is provided which includes an expanding sleeve for receiving a pin where the pin has shank terminating at a first end in a pin head and terminating at a second end in an externally threaded portion of the pin. The expanding sleeve may include a hollow tubular shank terminating at a first end in a sleeve head and having an opening at a second sleeve end for receiving the pin. The sleeve head include an internal sleeve head surface for engagement with an external pin head side surface when in an assembled position. When the pin and expanding sleeve in the assembled position are inserted into an aperture in a structure, a gap is formed between the aperture and an outer surface of the expanding sleeve. The outer surface of the expanding sleeve radially expands outward into the aperture filling the gap upon engagement of the internal face of the sleeve head and the external pin head surface.

Abstract: A blind rivet assembly is provided. In another aspect of the present invention, a blind rivet has ends that are received within countersinks in one or more workpieces and a mandrel head is completely pulled through the rivet without being severed from a mandrel stem. A further aspect of the present invention includes a mandrel with one or more ribs located on an outwardly tapering shoulder.

Abstract: A blind rivet assembly is provided. In another aspect of the present invention, a blind rivet has ends that are received within countersinks in one or more workpieces and a mandrel head is completely pulled through the rivet without being severed from a mandrel stem. A further aspect of the present invention includes a mandrel with one or more ribs located on an outwardly tapering shoulder.

Abstract: A wedge-type anchor assembly, capable of meeting cracked concrete testing standards, comprises an anchor bolt component and a substantially C-shaped expansion sleeve component annularly disposed about the anchor bolt component. A plurality of annular grooves, threads, or teeth are disposed only about the forward end portion of the expansion sleeve component, as opposed to throughout the entire axial length thereof, so that when the anchor bolt component is moved axially through the expansion sleeve component, the maximum interference area (M.I.A.) and maximum interference volume (M.I.V.) can be generated between the anchor bolt component and the expansion sleeve component in a controlled and predictable manner, as well as between the expansion sleeve component and the internal peripheral side wall portions of a concrete substrate or substructure can be generated so as to enhance pull-out resistance and reliability of the anchor assembly within the concrete substructure or substrate.

Abstract: A wedge-type anchor assembly, capable of meeting cracked concrete testing standards, comprises an anchor bolt component and a substantially C-shaped expansion sleeve component annularly disposed about the anchor bolt component. A plurality of annular grooves, threads, or teeth are disposed only about the forward end portion of the expansion sleeve component, as opposed to throughout the entire axial length thereof, so that when the anchor bolt component is moved axially through the expansion sleeve component, the maximum interference area (M.I.A.) and maximum interference volume (M.I.V.) can be generated between the anchor bolt component and the expansion sleeve component in a controlled and predictable manner, as well as between the expansion sleeve component and the internal peripheral side wall portions of a concrete substrate or substructure can be generated so as to enhance pull-out resistance and reliability of the anchor assembly within the concrete substructure or substrate.

Abstract: A rivetless nut plate assembly, which is fully preassembled, which can be installed into an aperture of a composite material workpiece, such as a carbon fiber structure, without risking delamination of the workpiece. The rivetless nut plate assembly includes a nut, a holding bracket, a retainer, and a sleeve member. Additionally, a stem is used to install the rivetless nut plate assembly. The sleeve member is configured such that the nut plate assembly can be installed in a composite material workpiece without risking delamination. The sleeve member may be formed of 45Cb-55Ti Titanium Columbium, as Titanium Columbium is a high strength and ductile material that resists corrosion in the presence of, for example, a carbon fiber composite structure. Monel, Titanium alloys, and other soft Nickel alloys are also good material selections for the sleeve, for similar reasons.

Abstract: A blind rivet assembly is provided. In another aspect of the present invention, a blind rivet has ends that are received within countersinks in one or more workpieces and a mandrel head is completely pulled through the rivet without being severed from a mandrel stem. A further aspect of the present invention includes a mandrel with one or more ribs located on an outwardly tapering shoulder.

Abstract: A system for mine roof reinforcement includes a bearing plate and a tubular member with an inner surface, an outer surface, first and second free ends, and an enlarged portion disposed proximate one of the free ends. The system also includes a projectile and an insertion member for being received in the tubular member. In addition, a method for inserting a bolt in rock includes: forming a borehole in rock; placing a bearing plate with an opening therein against the rock so that the opening is aligned with the borehole; disposing a tubular member in the borehole and opening so that an enlarged end of the tubular member abuts the plate; and mechanically expanding the tubular member so that an outer wall thereof frictionally engages the rock.

Abstract: A fastener assembly is inserted into a throughhole of a composite laminate to thereby fasten the composite laminate together. The throughhole has a length extending from a first outer surface of the composite laminate to a second outer surface of the composite laminate. The throughhole has a first width at the first outer surface, a second width at the second outer surface, and a third width at a point along the length of the throughhole between the first outer surface and the second outer surface. The third width is less than each of the first width and the second width. The fastener assembly includes a substantially annular fastener device having an axial opening and a peripheral surface substantially conforming to the inner surface of the throughhole.

Abstract: A peel type blind rivet for securement in an aperture of one or more workpieces, the rivet having a tubular shell a flange abutting one side of the workpieces, together with a mandrel with a stem extending through the shell and forming an enlarged head adjacent to the tail end face of the shell, whereby the head has a plurality of axially extending cutting edges for engaging with the body shell the setting process of the rivet.

Abstract: A connection, and a method of forming a connection, that adhesively fixes and bonds a fastening element or anchor in bore hole, particularly in a soft substrate or substrate with an interior cavity or void where the anchor is to be set in vertical wall or set upwardly into a ceiling. To make the connection, an accessory is used that has the form of a sleeve having a closed or partially blocked insertion end and an open anchor receiving end and apertures running along its length. The accessory helps to ensure that the anchor is surrounded with mortar or adhesive, and the mortar or adhesive contacts the wall of the bore. The cylindrical wall of the sleeve has apertures along its length. The sleeve can be formed with larger apertures formed near the anchor receiving end of the sleeve and smaller apertures formed near the insertion end of the sleeve. The sleeve is formed by inserting an open-ended cylindrical mesh tube into a frame that holds the tube along its length at a select location.

Abstract: A method for installing an expandable stiffener includes providing an assembly including a first sidewall and a second sidewall connected at a leading and trailing edge such that a cavity is defined therebetween, forming an opening extending through the first sidewall and the second sidewall, inserting a first expandable sleeve through the assembly opening such that the sleeve extends between the first and second strut sidewalls, and coupling the sleeve to the first and second sidewalls.

Abstract: A threaded fastener which includes a shank, a radially enlarged head at one end, an external thread on at least a part of the shank, and a bore which extends through the head and into the threaded part of the shank. At least the threaded part of the shank is radially expandable into the threaded engagement with the wall of a suitable unthreaded bore in a workpiece in which the threaded part has been inserted. The fastener thereafter is removable by unscrewing it from the workpiece bore. The expandable part of the shank is provided with a plurality of radially extending lugs or other protrusions provided on the threaded part of the shank thereby to resist unscrewing of the fastener from the workpiece bore.

Abstract: The present invention relates to an orthopedic fastener for fixing an implant, suture, or tissue to a bone. The fastener comprises a blind rivet and a closing element. The blind rivet includes a head at a proximal end, a shank connected to the head, and an anchoring portion near a distal end. A bore extends through the head and shank from the proximal end to the distal end and the bore has a polygonal cross-section through the anchoring portion. The closing element has a body with an outer surface and is configured and dimensioned to be received in the anchoring portion. The outer surface of at least a portion of the closing element distal end has a polygonal cross-section flaring along the longitudinal axis toward the closing element distal end. The anchoring portion of the blind rivet severs into a plurality of anchoring legs when the closing element is pulled in the bore toward the blind rivet proximal end to thereby prevent rotation of the fastener.

Abstract: An expandable anchor assembly removably secured to a wall, floor or other supporting structure for purposes of mounting any one of a variety of objects on the supporting structure, wherein the anchor assembly comprises an elongated sleeve including an interior, coaxially disposed channel extending along the length thereof between and in communication with open proximal and distal ends of the sleeve. A connecting structure is secured within the channel substantially adjacent to the distal end thereof and is cooperatively structured with an attachment portion of a connector, removably disposed within the channel through the open proximal end and into moveable engagement with the connecting structure.

Abstract: A blind bolt for securing a plurality of workpieces at a desired clamping force includes a pin having an elongated shank terminating at one end in an enlarged pin head and a generally elongated tubular sleeve adapted to receive said pin shank. The sleeve includes a first portion adapted to be located in aligned openings in the workpieces and a second portion being located on said pin shank between said pin head and said first sleeve portion. A nut is operatively connected with said pin and is adapted to be engaged by an installation tool whereby an axial force can be applied by the installation tool between said pin and the nut to clamp the workpieces together. The second sleeve portion is radially deformable at a location between said pin head and a blind side surface of the workpieces in response to the relative axial force of a magnitude less than the clamping force to form an enlarged blind head for engaging the blind side surface.

Abstract: A two piece blind fastener for securing a plurality of workpieces including a hollow sleeve having a straight shank with an enlarged sleeve head at one end and a pin having an enlarged pin head; the pin has a pin stop shoulder and a lock groove located near the pin stop shoulder; the pin head is adapted to engage the sleeve to form a bulb type blind head in response to a relative axial force applied between the pin and sleeve; the pin stop shoulder is adapted to engage a sleeve stop shoulder to direct the material of the sleeve stop shoulder 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; in addition the pin has an expander portion adapted to expand the sleeve shank radially outwardly to fill the openings of the workpieces and with the expander portion having a grooved section with alternate relief grooves and expander segments with the relief grooves receiving e

Abstract: A fastener system including a blind grounding stud and a sleeve. The sleeve has a first section abutting a second section. The first section has a smaller outer surface diameter than the second section. A knurled band is formed around the first section beginning at the intersection between the first and second sections. The sleeve has an opening axially through the two sections. The opening has a first larger inner surface which tapers via a frusto-conical surface to a smaller diameter inner surface. The larger diameter inner surface extends from the free end of the sleeve first section and extends toward the second section to the frusto-conical surface. The smaller diameter inner surface begins at the free end of the second section and extends toward the first section to the frusto-conical inner surface. The smaller diameter inner surface spans at least a portion and preferably all of the knurled band.

Abstract: A blind fastener with a pin having a pin shank which extends through a cylindrical main sleeve and expansion sleeve whereby it can be gripped and pulled by an installation tool with the pin having an enlarged pin head at the blind end of the pin shank. The expansion sleeve is located between the pin head and the inner end of the main sleeve and is adapted to move into the inner or blind end of the main sleeve to form a first tulip shaped blind head for clamping workpieces together in response to a relative axial force applied between the sleeves and pin by engagement of the pin head with the expansion sleeve. As the axial force is increased the pin head is moved into the expansion sleeve to form a second tulip head to further clamp the workpieces and to secure the pin, main sleeve and expansion sleeve together at that end and is moved closely adjacent the workpiece surface at the blind side to form a high strength blind head.

Abstract: A fastening assembly for securing objects to a masonry body, such as shutter assemblies used to secure building windows, that includes a screw member, an anchorage assembly, an insert assembly partially housed within the anchorage assembly and a bushing ring coaxially journaling the screw member adjacent to the head. Thick grease is packed with the bushing ring to seal the internal components from the elements. The bushing ring has an internal through opening with two internal diameters. One of them, adjacent to the screw head being slightly larger than the shank of the screw in order to seal the rest of the components from the elements. The other end of the internal through opening being larger so that a portion of the insert member can penetrate therein when the assembly is tightened.

Abstract: The present invention concerns a self-cutting blind rivet/expansion rivet without draw nails in the core of the rivet, a method for blind riveting/expansion and an apparatus for performing the method, together with a function for expansion by a combination of these within the same process. There is described a blind rivet (101) expansion rivet (300) which comprises a head (101) with an engagement body (102) for co-operation with a complementary screw nose on a mounting tool, a self-drilling tip (103) in the outer end of the rivet and an axial hole (104) which at least over part of its length is provided with a conical section for attachment from the tool for mounting the rivet, and in addition a mountable head (FIG. 3A) for expansion/riveting which is equipped with a clamping sleeve (303). A self-drilling blind rivet system comprises a tool for placing and expanding the rivet in the same process, where the tool's nose head increases the area of application within a number of fastening systems.

Abstract: A blind fastener has an assembly including an inner sleeve, an outer sleeve and a pin member and is adapted to be located in workpiece openings with the pin member having an expansion portion adapted to be pulled through the inner sleeve radially expanding both the inner and outer sleeves to provide an interference fit with the workpiece openings.

Abstract: A temporary fastener that fastens two adjacent workpieces. The fastener includes a shank that extends through a hole of the workpieces. Extending from one end of the shank is a conical shaped head. The fastener also contains a pull stem which has a head located adjacent to the blind end of the shank. The stem head is pulled through the shank to expand and tightly fasten the shank to the workpieces. The fastener is removed by drilling through the head and the shank. The diameter of the conical shank head is smaller than the diameter of the drill so that part of the head does not become attached to the drill bit and scratch the workpiece. The conical shape of the head also reduces the volume of fastener material to further reduce the size and amount of chips produced during the drilling process. The tightly engaged shank prevents the fastener from rotating during the drilling operation.

Abstract: A fastener structure for particular use in clamping a panel assembly includes a bolt or pin member having a generally elongate shank for extension through a panel, and a locking-recess in the shank for reception of a locking formation. The pin shank is insertable through a sleeve having a bore which terminates at an anvil portion surrounding the inserted pin shank. A lock collar is insertable into the sleeve bore radially between the shank locking-recess and the sleeve into abutment against the anvil portion of the sleeve. Compression of the locking collar against the abutting anvil portion of the sleeve produces cold flow deformation of a portion of the collar into the locking-recess of the shank to form a locked joint so that the collar then blocks any subsequent relative movement between the pin shank and sleeve to secure the fastener structure.

Abstract: A blind rivet fastener which has a bulb forming collar that is assembled by sliding the collar down the shank of the fastener stem. The bulb collar is seated adjacent to the head of the stem. The stem has a shoulder and a pull portion that extend through the inner channel of a sleeve. The sleeve, shoulder and stem head are typically inserted into the matching holes of two workpieces. The sleeve has a head located at an accessible side of the workpieces and an opposite chamfered end located at an inaccessible "blind" side of the workpieces. The fastener is installed by holding the sleeve while pulling the shoulder through the sleeve channel. The stem head pushes the bulb collar, which engages the chamfered end of the sleeve. The bulb collar has an inwardly tapered end which bends the sleeve in a radially outward direction. The deformed end and sleeve head secure the sleeve to the workpieces.

Abstract: The present invention relates to a process for riveting materials by means of a blind rivet and corresponding blind rivets. The process of the invention in particular carries out the step of stretching the body of the sleeve (31) before blocking it from one part to another of an assemblage (13, 14) between an abutment head (50) and a blocking head (51). The extending of the body of the sleeve is especially permitted by the cooperation of a stop means (44) with a shoulder (36a) of the shank of the mandrel (32), and by the pulling exerted on the mandrel. The present invention also relates to blind rivets adapted to be set by the process of the invention.

Abstract: An all-metal expansible hollow anchor and nail assembly adapted to fasten to masonry a fixture or other object having a mounting hole. The anchor which goes through the fixture mounting hole into a hole drilled in the masonry, is provided with a head that then engages the fixture and an expansible body projecting from the head into the drilled hole whereby when the nail is driven into the hollow anchor, the anchor body then expands against the wall of the hole to lock the anchor therein. The expander nail has a head whose diameter is greater than that of the drilled hole and a shank of smaller diameter joined to the underside of the nail head by a junction section of progressively increasing diameter whereby the shank gradually merges with the head. Countersunk in the head of the anchor is a well that conforms to the shape of the nail head and the junction section, the well receiving and nesting the nail head and junction section when hammer blows are applied to the nail head.

Abstract: A push-in rivet for being mounted on and interconnecting a connector and a circuit board. The rivet body includes a head portion, a plurality of spaced-apart flexible legs, and a shank portion which interconnects the head portion and the legs. The legs are flexible and are subsequently radially inwardly movable for passage through a hole formed in the board and radially outwardly movable after passage through the hole so as to interconnect the connector and the board. The method of riveting the connector to the board includes the steps of passing the rivet through a hole in the connector so that the head portion abuts a surface of the connector, drawing a mandrel through the bore so as to outwardly expand the legs, and passing the legs of the rivet through a hole in the board so as to radially inwardly compress the legs for passing through the hole in the board and subsequently radially outwardly expanding the legs so as to secure the board to the connector.

Abstract: A method and apparatus for attaching two members together which includes forming an opening through a first member. A second member has a first portion thereof which is larger than the opening in the first member and a second portion disposed about a longitudinal axis. The second portion is smaller than the opening in the first member and the second portion is divided along the longitudinal axis into at least two sections. A hole is formed through the second member along the longitudinal axis. An elongated member having an enlarged head thereon is placed through a washer, the enlarged portion of the elongated member being larger than the opening in the washer, but smaller than the hole through the second member.

Abstract: A fastener is provided for joining two components together, particularly advantageous with respect to aluminum components, in which a nut insert is secured within the components and a rivet is inserted into the nut. After insertion of the rivet into the nut, the rivet is offset to conform to the internal threads of the nut, and when a tool receiving bit is included on the outer face of the rivet, threaded removal of the rivet and disassembly of the components can be effected.

Abstract: A fixing element of metal, in particular for fixing facing panels, has a slotted expansible sleeve arranged to be expanded into an undercut of a drilled hole and having an inner bore with a slotted part, and an expander element effecting an expansion of the expansible sleeve and arranged to clamp an article to a facing panel. The expansible sleeve has a plurality of inwardly bent expansible segments having a leading end face and an outer surface and provided with a circumfernetial enlargement arranged on the outer surface of the expansible segment in the region of the leading end face. The expander element is formed as a blind rivet with a rivet shank and a clench head which is drawn with the rivet shank into the slotted part of the inner bore of the expansible sleeve and riveted.

Abstract: A self-plugging blind rivet 10 comprises a tubular body 14 having a preformed head 34 at one end, and in the bore 36 of which a headed stem 12 is disposed. The stem 12 projects from the head 34 end of the body 14, and the head 18 of the stem 12 is substantially enclosed by a region 42 of the body 14 remote from the preformed head 34. The head 18 of the stem 12 abuts a shoulder 44 provided by a region 43 of the body 14 in which the diameter of the bore 36 is reduced and the wall is thickened. Axially spaced apart annular grooves 46, 48 in the external surface of the body 14 define between them a portion 50 which will collapse to form a blind head when the body 14 is compressed axially by pulling the stem 12 while supporting the preformed head 34. Finally, the stem head 18 may be pulled into the reduced diameter region 40 of the bore 36 and thereby cause the blind head to be reshaped and forced into compressive engagement with work being fastened.

Abstract: An expansion sealing plug having a frusto-conical plug body with peripheral U-shaped grooves, an expansion member comprising either an inner wedge pin or a spherical member, and a tapered coaxial bore for receiving the expansion member. The inner wedge pin has a greater average outside diameter and the spherical member has a greater maximum outside diameter than the tapered coaxial bore. The plug body and expansion member are proportioned to be readily preassembled such that the expansion member is frictionally retained after partial insertion into the plug body. The unexpanded plug is inserted into a counterbore that is reamed or formed with the same taper angle as the plug body and the expansion member is driven axially into the plug such that the plug body is radially expanded to forcibly engage the counterbore.

Abstract: The fastener assembly includes a generally solid pin, positioned within a tubular fastener body and a buckle sleeve. The fastener body has a generally cylindrical configuration and includes an enlarged head adjacent one end thereof, an intermediate shank portion, and a nose portion adjacent the other end thereof. The nose portion engage the buckle sleeve, and during installation causes the buckle of the buckle sleeve to form prior to workpiece contact by the interaction between the nose portion of the fastener and the leading edge of the buckle sleeve. The sleeve buckles the intersection between a trailing section and the largest inner diameter at the end of a tapered interior section.

Abstract: The disclosure relates to a grommet for relatively soft panels comprising male and female elements that mechanically interlock with one another. The male and female elements having complementary truncated conical surfaces that pinch and deflect a flanged portion of the skin of the panel into a complementary annular rib and groove thereby to fasten and minimize creep of the skin relative to the grommet. The male and female elements of the grommet are positively locked to one another by a relatively simple assembly operation.

Abstract: A pull-type blind fastener for installation in aligned bores in juxtaposed workpieces to be joined has a sleeve, a pin through the sleeve, and a barrel on the pin between a pin head and the sleeve. The pin is pulled into the sleeve by an installation tool to expand the sleeve and make an interference fit with the workpieces, the barrel forms a blind side retaining bulb on the sleeve, and a selectively annealed zone on the pin shank elongates to accommodate different workpiece thicknesses within a grip range of the fastener. The annealed zone remains exterior to the workpieces to preserve integrity of the interference fit. The installation force deforms a head on the sleeve into engagement with a stop shoulder on the pin to stop a pin break neck in flush breaking relationship with the head.

Abstract: An apparatus comprising a sleeve insertable into a borehole, the borehole having a first diameter. A roof pin is inserted into the sleeve, the roof pin having a second outer diameter which is less than the first diameter. The outer surface has a peripheral dimension prior to insertion of the sleeve into the borehole. The inner or the outer surface contains at least one longitudinally extending yieldable channel portion which is of a lesser sleeve thickness than the remainder of the sleeve, permitting circumferential expansion of the sleeve. Expansion of the sleeve establishes a restraint between the roof pin and the borehole. When the sleeve is expanded within the borehole, continuous peripheral contact is made between the outer surface and the borehole.

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 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 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 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 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.

Abstract: A temporary fastener that fastens two adjacent workpieces. The fastener includes a shank that extends through a hole of the workpieces. Extending from one end of the shank is a conical shaped head. The fastener also contains a pull stem which has a head located adjacent to the blind end of the shank. The stem head is pulled through the shank to expand and tightly fasten the shank to the workpieces. The fastener is removed by drilling through the head and the shank. The diameter of the conical shank head is smaller than the diameter of the drill so that part of the head does not become attached to the drill bit and scratch the workpiece. The conical shape of the head also reduces the volume of fastener material to further reduce the size and amount of chips produced during the drilling process. The tightly engaged shank prevents the fastener from rotating during the drilling operation.

Abstract: A method for creating a hole for a permanent fastener that replaces a temporary fastener that fastens two adjacent workpieces. The temporary fastener includes a shank that extends through a hole of the workpieces. Extending from one end of the shank is a conical shaped head. The temporary fastener has an inner channel that extends through the shank from the head to the opposite end. The fastener also contains a pull stem which has a head located adjacent to the blind end of the shank. The stem head is pulled through the shank to expand and is expanded to tightly fasten the shank to the workpieces. The fastener is removed by drilling through the head and the shank. The diameter of the conical shank head is smaller than the diameter of the drill so that part of the head does not become attached to the drill bit and scratch the workpiece. The conical shape of the head also reduces the volume of fastener material to further reduce the size and amount of chips produced during the drilling process.