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: The invention provides a rivet and method of installing the rivet to attach honeycomb material to other materials. The rivet is installed by drilling a hole through the materials. A back side sleeve of the rivet is inserted through one end of the hole while a front side sleeve with a stem member inserted therethrough is inserted through the other end of the hole such that the head of the stem member and the sleeve portion of the front sleeve are positioned within the sleeve portion of the back sleeve. The shank portion of the stem member is then pulled such that the head of the stem member expands the sleeve portions of the front and back sleeves into the materials to attach the rivet to the materials. A locking collar is also provided to lock the stem member to the front sleeve upon continued pulling of the stem member.

Abstract: A blind fastener for securing a plurality of workpieces is provided that has a sleeve, and a pin member. In an alternate embodiment, the blind fastener has a sleeve, a pin member and a nut. The sleeves have a head with a plurality of rearwardly sloping recesses disposed therein. The recesses are adapted to be engaged with a plurality of rearwardly sloping nibs disposed on one end of a nose secured to an installation tool. The pin members have a splined head adapted to be engaged with a splined driver secured to an installation tool. Use of the splined head on the pin member, the splined driver, rearwardly sloping recesses on the sleeve, and rearwardly sloping nibs on the nose eliminates camming out of the nibs from the recesses during installation of the blind fastener. A nose assembly for installation of the blind fastener is also provided.

Abstract: A blind rivet having a mandrel with a predetermined breakable stem disposed within a body with a bored shank. A radial flange is formed on one end of the shank to engage a workpiece and at the other end of the shank there is disposed within the shank an enlarged head of the stem the diameter of which is greater than the diameter of the bore of the shank. The breakneck of the stem formed with at least two series of radial impressions formed around the circumference of the shank at predetermined distances from the flange. Ribs are formed alternately between the radial impressions in the same horizontal series therewith.

Abstract: A device for producing a riveted joint includes a mechanism (21, 25) to fire a rivet (14) having a jacket (14a) and a pin (14b) guided through the jacket (14a). The rivet is fired through the workpieces to be joined. A means is provided for pulling the rivet (14). The device that can be manufactured at a reasonable price and ensures reliable operation by the mechanism (21, 25) for firing the rivet (14) acting upon the rivet pin (14b).

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 blind setting rivet assembly capable of permanently fastening one or more sheet metal work pieces or the like together is disclosed. The rivet assembly may be self polishing and self tapping and may also provide a hollow cylindrical threaded bolt head onto which a nut may be affixed to provide a means to removably attach other work pieces, components or the like. The rivet assembly comprises a rivet body having a hollow tubular sleeve and an enlarged flattened head. The rivet body surrounds a mandrel that may have a weakened area of reduced diameter to allow detachment of the mandrel shaft following application of sufficient axial force to the shank. This application of force sets the rivet by causing a tapered shoulder section of the mandrel to deform the rivet sleeve. The mandrel shank may be terminated in a screw tip. This screw tip punctures, spreads, self-taps, and self-polishes an aperture in the work pieces through which the rivet sleeve passes.

Abstract: A fastener for installation into a workpiece which may be installed by either a swaging operation or a torquing operation. The fastener includes an enlarged protruding head which is proximal to a substantially cylindrical smooth shank portion. A threaded shank portion positioned distal to the smooth shank portion includes a male thread which is sufficiently strong to have a swage collar swaged onto it. Distal to the threaded shank portion is a pin tail portion having a surface which is configured to engage a tool. Positioned between the threaded shank portion and the pin tail portion is a breakneck groove having a lower tensile strength than any other portion of the fastener. The tensile strength of the breakneck groove is controlled such that the fastener severs within the breakneck groove when a preset range of tension is applied to the pin tail portion by the tool.

Abstract: A blind rivet. The blind rivet includes a rivet, a stopper, and a shaft. The rivet includes a cylindrical body and a brim at one end of the cylindrical body. The stopper includes a first end, a second end, and a cone connected between the first end and the second end. The first end includes a braking structure, and the shaft includes a neck extended from one end of the shaft body and connected to the second end of the stopper.

Abstract: There is provided a peel type blind rivet (22) for securement in an aperture of a workpiece, the rivet comprising a tubular shell (24) having a flange (26) at one thereof, this shell housing a mandrel stem (28) with a mandrel head (30) disposed at one end of the mandrel stem so as to abut a remote end of the tubular shell, the mandrel head (30) having a plurality of edges extending radially outwards therefrom which, in operation when the mandrel is subjected to a tensile load engage with the remote end of the shell so as to split the shell into a plurality of segments (40) to engage the blind side of the workpiece, whereby the stem of the mandrel further comprises at least one protrusion (38) about which the shell of the rivet body deforms during setting to retain the mandrel head (30) within the set rivet.

Abstract: The invention relates to a blind rivet, a rivet pin, a holding device, a method for producing a blind rivet and a method for creating a riveted joint which enables a permanent joint to be produced between several workpieces in one working cycle.

Abstract: A blind fastener with an improved drive nut and assembly process. The blind fastener includes a screw, a sleeve, a nut, and a drive nut. The drive nut has a smooth bore and protruding nibs that mate precisely with a driving recess located in the nut head. A side portion of the drive nut is deformed to retain the drive nut on the screw against the nut. Once the new assembly process for the blind fastener has been completed, the drive nut will have been mated with the nut head to prevent any rotation of the nut during installation of the blind fastener. The assembly process includes placing the sleeve over the threads of the screw to a position adjacent the screw head. The nut is then threaded onto the screw adjacent the sleeve. The protruding nibs of the drive nut are next aligned and physically engaged into the driving recess of the nut head by sliding the smooth bore over the screw.

Abstract: A fastener for installation into a workpiece which may be installed by either a swaging operation or a torquing operation. The fastener includes an enlarged protruding head which is proximal to a substantially cylindrical smooth shank portion. A threaded shank portion positioned distal to the smooth shank portion includes a male thread which is sufficiently strong to have a swage collar swaged onto it. Distal to the threaded shank portion is a pin tail portion having a surface which is configured to engage a tool. Positioned between the threaded shank portion and the pin tail portion is a breakneck groove having a lower tensile strength than any other portion of the fastener. The tensile strength of the breakneck groove is controlled such that the fastener severs within the breakneck groove when a preset range of tension is applied to the pin tail portion by the tool.

Abstract: A device and method for inserting rivets. The device and method allows for accurate, consistent installation of threaded blind rivets. The device comprises a rivet insert tool, a rivet insert shaft, and a sleeve through which the shaft passes. This provides significant accuracy to less accurate rivet inserting devices.

Abstract: A lockbolt includes a bolt head, a shank, a locking portion, a predetermined breaking point, and a break-away portion. The locking portion includes a knurled surface having knurling peaks between intersecting knurling grooves that extend in a direction with an axial component, e.g. spiraling helically. A sealant on two workpieces smears onto the knurled surface when the bolt is inserted in a hole therein, but does not need to be removed. A locking collar is swaged onto the locking portion to secure the workpieces between the head and the collar. The sealant is distributed as a thin layer to provide a seal and an adhesive bond between the collar and the knurled surface. Excess sealant is squeezed-out axially, without forming encapsulated pressurized sealant pockets and without hindering the swaged engagement of the locking collar onto the knurling. Then the break-away portion is broken-off at the breaking point.

Abstract: The present invention provides a fastener for securing workpieces together which has a stem having an enlarged head at one end thereof that has a cavity therethrough, a main sleeve and an expander sleeve. The expander sleeve is adapted to move into a bore of the main sleeve to radially expand the main sleeve to form a first blind head for clamping the workpieces together in response to a first axial force. The enlarged stem head is adapted to move, without any deformation thereto, into a bore of the expander sleeve to radially expand the expander sleeve to form a second blind head to further clamp the workpieces together in response to a second axial force. The fastener further has a breakneck groove on the stem adapted to fracture the stem in response to a third axial force.

Abstract: Fasteners for fastening adjacent workpieces, and methods and apparatus for installing them. The fasteners include a shank having a head on one end. In one form, the other end may include a counterbore, with the outer end of the counterbore deflected inward to form an inward taper on the end of the shank, facilitating the entry of the shank into the hole in the work pieces. In another form, the other end of the shank may simply be formed with a chamfer. The fasteners also contain a stem having a head located adjacent the blind end of the shank. The stem head is pulled to expand and tightly fasten the shank to the workpieces. While applicable to both temporary fasteners and some permanent fasteners, configurations disclosed particularly for temporary fasteners can allow use of a high strength material for the shank, allowing temporary fastening of larger parts and/or with fewer temporary fasteners than with prior art temporary fasteners.

Abstract: A two piece blind fastener for securing a plurality of workpieces including a hollow sleeve having an enlarged sleeve head at one end and a pin having an enlarged shear ring at the end opposite the sleeve head followed by an elongated retention portion of reduced diameter. The shear ring is adapted to engage and move inside the sleeve to form a tuliped shaped blind head in response to a relative axial force applied between the pin and sleeve and to shear off proximate to the inner or blind sheet line of the workpieces. The retention portion is then moved with the pin shank into the shear ring and with the shear ring finally located at a position on the retention portion depending upon the overall thickness of the workpieces. This provides a clamp and lock section between the pin and sleeve at the inner or blind side of the workpieces. The pin and sleeve have a lock structure actuated after final formation of the clamp and lock section to provide a lock between the pin and sleeve.

Abstract: A blind fastener which can be installed by access to one side only of a workpiece comprises a pin, a sleeve, and an abutment member. The pin extends inside the sleeve and engages the sleeve at one end. The other end of the sleeve has a radially enlarged head. The sleeve is of one piece and has a radially expandable portion. The abutment member is adjacent to the sleeve head and abuts a frangible element of the sleeve head. The sleeve is inserted into an aperture in a workpiece with the expandable portion protruding beyond the blind face of the workpiece and the head abutting the near face of the workpiece. A pulling force is applied to the part of the pin extending beyond the abutment member and the expandable part of the sleeve expands radially to form a blind head against the blind face of the workpiece.

Abstract: Disclosed is a self plugging blind rivet for securing together apertured members, the rivet comprising a tubular shell having a tail end face at one end and a preformed radially enlarged bead at the other end, and a stem that extends through the shell and has a stem head adjacent the tail end face of the shell and a breakneck located away from the stem head, in which the region of the stem shank on the stem head side of the breakneck has a plurality of depressions formed therein extending to the breakneck, the corresponding region of the shell substantially filling the depressions in a region adjacent the stem head and progressively less towards the breakneck whereby, in use and under axial compression loading of the shell, the shell preferentially buckles in the region adjacent the member remote from the preformed head to form a blind head in contact with the member so as to clamp together the apertured members.

Abstract: A blind rivet is constructed to include a rivet, a stopper, and a shaft, the rivet having a cylindrical body and a brim at one end of the cylindrical body, the stopper having a first end, a second end, and a cone connected between the first end and the second end, the first end having a braking structure, the shaft having a neck extended from one end of the shaft body thereof and connected to the second end of the stopper.

Abstract: A blind rivet having a mandrel with a predetermined breakable stem disposed within a body with a bored shank. A radial flange is formed on one end of the shank to engage a workpiece and at the other end of the shank there is disposed within the shank an enlarged head of the stem the diameter of which is greater than the diameter of the bore of the shank. The breakneck of the stem formed with at least two series of radial impressions formed around the circumference of the shank at predetermined distances from the flange. Ribs are formed alternately between the radial impressions in the same horizontal series therewith.

Abstract: A shift washer which is used in a blind fastening system. The shift washer is made using a process of wrapping a piece of wire stock around a mandrel. This process provides significant cost advantages compared to the process of machining the shift washer. A flange can be provided on the shift washer to prevent the shift washers from nesting with one another and results in easier assembly of the blind fasteners.

Abstract: A blind fastener with an improved drive nut and assembly process. The blind fastener of the present invention includes a screw, a sleeve, a nut, and a drive nut. The new drive nut of this invention has protruding nibs that mate precisely with a driving recess located in the nut head. The protruding nibs of the new drive nut are not deformable and serve to replace the deformable annular ridge that was used in previous drive nut assemblies. The configuration of the protruding nibs and the recess in the nut head can be of many forms, so long as both parts are capable of being mated. Once the new assembly process for the blind fastener has been completed, the drive nut will have been mated with the nut head to prevent any rotation of the nut during installation of the blind fastener. The assembly process will now include placing the sleeve over the threads of the screw to a position adjacent the screw head.

Abstract: The invention concerns a blind rivet (cup-, sleeve-shaped blind rivet) comprising a cap which is slipped over a blunt or pointed rivet shank, a method for producing a blind rivet comprising a cap, and a method for establishing a riveted joint by which a permanent connection between several workpieces is produced in one working step.

Abstract: A blind rivet having a mandrel with a predetermined breakable stem (4) disposed within a body with a bored (18) shank (14). A radial flange (16) is formed on one end of the shank and the other end (20) of the shank is engaged with the enlarged head (2) up the stem the diameter of which is substantially equal to that of the shank. The mandrel below the enlarged head has a plurality of indentations (8) formed on the stem to define a square of reduced cross-sectional area. The shank has an enlarged internal cross-sectional area (22) to substantially engage the indentations of the stem below and adjacent to the enlarged head of the stem.

Abstract: The blind rivet assembly has a sleeve with a swage head and a sleeve shaft. A mandrel having a head and a shaft is guided through the sleeve. The mandrel shaft is rigid and the sleeve shaft is provided with a deformation region that extends in the longitudinal direction of the sleeve. The deformation region is designed such that a closing head is formed at different longitudinal positions of the deformation area by sleeve folding. The deformation region has continuously decreasing mechanical strength properties in the direction towards the swage head. The blind rivet enables to easily join structural parts of different thicknesses and guarantees at the same time to tear off the mandrel shaft with the swage head in a planar manner.

Abstract: A blind fastener with an improved drive nut and assembly process. The blind fastener includes a screw, a sleeve, a nut, and a drive nut. The drive nut has a smooth bore and protruding nibs that mate precisely with a driving recess located in the nut head. An end of the drive nut opposite the nibs is deformed to retain the drive nut on the screw against the nut. Once the new assembly process for the blind fastener has been completed, the drive nut will have been mated with the nut head to prevent any rotation of the nut during installation of the blind fastener. The assembly process will now include placing the sleeve over the threads of the screw to a position adjacent the screw head. The nut is then threaded onto the screw adjacent the sleeve. The drive nut's protruding nibs are next aligned and physically engaged into the driving recess of the nut head by sliding the smooth bore over the screw.

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: A blind rivet assembly 10 includes a mandrel 2 and a rivet body 4. The mandrel 2 has a head portion 6 and a shank portion 8. The rivet body 4 has a generally cylindrical body portion 12 terminating in a flange 14 at a first end, and a free end 16 at the other end of the body portion 12. The mandrel 2 is assembled into the rivet body 4 so that the free end 16 of the body portion 12 contacts the underside 18 of the head portion 6. The free end 16 of the body portion 12 is attached to the underside 18 of the head portion 6 of the mandrel 2.

Abstract: A peel type blind rivet (1) has a rivet body (2) composed of a cylindrical part (3) and a flange-shaped head (4) formed integral with one end of the part, and a mandrel (5) composed of a body (6) for insertion in the part and an enlarged head (7) formed at one end of the body. Radial blades (9) are formed integral with a lower surface (8) of the mandrel head such that the other open end (14) of part (3) will be cut into radially protruding split feet (14a) when the mandrel body (4) is pulled back. The mandrel head (7) is of a maximum diameter (D) greater than an outer diameter (d) of the cylindrical part (3). The lower surface (8) increases its diameter gradually and upwards from the mandrel body (6) towards a rim (7a) of the mandrel head having the maximum diameter. Each blade (9) is of a V shape protruding downwards from the lower surface such that a cutting edge (10) of each blade extends upwards and obliquely from the mandrel body towards the rim.

Abstract: A blind rivet (10) comprises a substantially cylindrical body (2) and a mandrel (4) which body includes one or more circumferential grooves (12,14) formed on the outer face of the body. Each groove (12,14) is reinforced by one or more axial reinforcing ribs (16).

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 self-plugging blind rivet for securing together apertured members comprises a tubular shell (11) having a tail end fact (16) at one end, a pre-formed radially enlarged head (13) at the other end, and a stem which extends through the shell and has a stem head (22) adjacent the tail end fact (16) of the shell. The region adjacent the stem head (22) is of increased diameter relative to the rest of the stem shank and has a plurality of axial depressions (26) formed therein, the corresponding region of the shell being arranged to fill the axial depressions (16) in the stem and being harder than the material of the shell (11) in a region adjacent the radially enlarged head (13). In use and under axial compression leading of the shell (11), the shell (11) buckles in the region adjacent the member remote from the performed head to form a blind head in contact with said member so as to clamp together the apertured members.

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 blind bolt assembly for compressively connecting at least two overlapping workpieces having a hollow bolt sized to be received within aligned aperture in the workpieces. The hollow bolt includes an enlarged head portion, a grip section extending from the head portion and reduced diameter externally threaded end portion extending from the grip section. An angled ramp section extends along the hollow bolt between the grip section and the threaded end portion. A core bolt having an elongated shaft is positioned within a cylindrical hole in the hollow bolt and includes a drive head extending outside of the hollow bolt. The blind bolt assembly includes a cylindrical collar having an internally threaded section for threadable receipt of the threaded end portion of the hollow bolt and a drive section for receipt of the drive portion of the core bolt. The drive portion of the core bolt and the drive section of the collar preferably include mating splines.

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 one-piece wood rivet having a first upper portion and a second lower portion is disclosed for use in adjustably securing a first piece of wood to a second piece of wood. A typical application of the rivet is the adjustment of a door threshold assembly. The first upper portion of the one-piece wood rivet includes a head and a flange. The second lower portion of the one-piece wood rivet includes a threaded shank which mates with a nut affixed to the second piece of wood. The head of the first upper portion of the one-piece wood rivet includes a lip which is deformable into a countersunk bore in the first piece of wood. The one-piece wood rivet resides substantially in a bore which extends through the first piece of wood. The one piece wood rivet is rotatable within the bore of the first piece of wood and is secured to the first piece of wood by its flange and the deformed lip. The second piece of wood includes a bore therethrough and a nut having threads affixed to the second piece of wood.

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 improved method of blind riveting and an improved blind rivet have been described. The blind rivet of the present invention includes an interference fit shank portion which ensures adequate hole-fill and produces work hardening in a work piece. The blind rivet of the present invention also produces a drawing effect, reducing the force necessary to securely seat the rivet in a hole.

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: To produce a blind-rivet connection in which the rivet shaft (7) breaks off flush with the set-head (4) of the blind rivet (1), regardless of the total thickness (G) of the components (21) to be riveted, a blind rivet (1) is proposed whose rivet shaft (7) is provided with a plurality of break-off grooves (13) arranged axially in series. The tension segment (12) of the rivet shaft (7) is always separated at the break-off groove (13a) that is flush with the set-head end (11) after the rivet shank (2) has buckled to form a closing head (27).

Abstract: A blind fastener for clamping sheet components and including a mechanical lock to prevent loosening of the fastener. The fastener is self-expanding following insertion and engagement of the threaded stem. The fastener includes an internally threaded nut body, an externally threaded stem threadably received within the nut body, and a lock sleeve matingly receiving the nut body. Carried on the stem is an expandable sleeve which expands to engage the underside of the material. Rotation of the stem following insertion of the assembly into the aperture will draw the stem head and expandable sleeve against the backside for the material causing the sleeve to expand outwardly. In addition, the locking sleeve is pushed beneath the expansion sleeve wedging between the threaded stem and expansion sleeve. This mechanical lock is resistant to vibration locking the fastener against loosening.

Abstract: A breakable-stem blind rivet (5) is having a mandrel (10) with an enlarged head (12) which is positioned in a shell (20). Before the beginning of the setting operation, the shell (20) is having an exterior diameter which at all points is smaller than the interior diameter of the hole (4) in which the breakable-stem blind rivet is to be set. The breakable-stem blind rivet therefore without any preformed set head has basically the form of a hollow cylinder. Preferably the shell (20) on both sides of a central section (21) is provided with areas (23, 25) in which the shell (20) is more easily deformable than in the central section (21). An apparatus for setting the breakable-stem blind rivets of this kind is provided with a workpiece pressing means (32) surrounding a mouth piece (30) which with respect to the mouth piece (30) is relatively movable and is exerting a force onto the front side of the workpiece.

Abstract: A bolt anchoring device for insertion into a bore in a concrete ceiling or the like material is provided. The bolt anchoring device comprises an anchor sleeve and a bolt. The anchor sleeve is first inserted in the bore for its provisional or temporary attachment. The bolt is then screwed into the anchor sleeve for permanent attachment of the anchor sleeve and the bolt. In one embodiment, the bolt is removable after permanent attachment of the anchor sleeve. The anchor sleeve has a self-retaining means for retaining itself in the bore at the time of its provisional or temporary attachment. The anchor sleeve has a first end portion having a threaded hole and a second end portion having a plurality axial slits. The bolt has an integral plug portion which is pushed into the second end portion to expand the second end portion and make it cut into an inner wall surface of the bore for thereby firmly securing the anchor sleeve in the bore.

Abstract: A sealing fastener, such as a sealing rivet, is disclosed for sealing engagement with a workpiece. The sealing fastener has a head and a shank extending from a lower surface of the head. An aperture passes through the head and shank, and a mandrel and collar fit within the aperture. A sealing member, such as an O-ring is disposed between the collar and the mandrel. The head of the sealing fastener may also have a groove formed therein and may have a sealing member disposed at least in part in the groove. In use, the rivet is placed through an opening in the workpiece, and a lower portion of the shank is collapsed so to form a lower head and so that the upper and lower heads engage the workpiece. The sealing member is compressed between the collar and a wall of the aperture, and the collar and mandrel are placed in locking engagement to maintain the sealing member in a compressed state.

Abstract: Extended fatigue endurance and high pre-load are achieved in a structural blind fastener by combining the best features of screw type and pull type blind fasteners. We replace fatigue critical details from the shear plane with close tolerance, slip fit, core bolt and outer bolt shanks to obtain the desired structural load paths while retaining anchoring features of screw type fasteners to introduce adequate pre-load. These fasteners are compatible with currently available blind bolt insertion tooling.

Abstract: A blind setting rivet assembly capable of permanently fastening one or more sheet metal work pieces or the like together is disclosed. The rivet assembly may be self tapping and may also provide a hollow cylindrical threaded bolt head onto which a nut may be affixed to provide a means to removably attach other work pieces, components or the like. The rivet assembly comprises a rivet body having a hollow tubular sleeve and an enlarged flattened head. The rivet body surrounds a mandrel which may have a weakened area of reduced diameter to allow detachment of the mandrel shaft following application of sufficient axial force to the shank. This application of force sets the rivet by causing a tapered shoulder section of the mandrel to deform the rivet sleeve. The mandrel shank may be terminated in a screw tip. This screw tip punctures, spreads, and self-taps an aperture in the work pieces through which the rivet sleeve passes.

Abstract: A rotatably fastening blind rivet is provided. The blind rivet includes a tubular rivet body of ductile material and an elongate stem engaged into the rivet body which has a radially enlarged rivet head of hexagon configuration at one end having a serrated surface and a central bore, a threaded inner periphery of predetermined pitch and number of threads in an upper region and a progressively introversion inner periphery in a lower region of the body. The stem includes a cylinder shank of threaded outer periphery engageable with the threads of the rivet body, a breakneck on the top of the shank from which a tensioning rod of hexagon spiral outer periphery extends upward and is slidably engageable with the central bore of the rivet head and a terminal head of stiffness material at a lower end of the shank remote from the rod having serrated surface toward the shank.

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.